TDA7541 STMicroelectronics, TDA7541 Datasheet
TDA7541
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TDA7541 Summary of contents
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... Fully electronic alignment – Independend weather band input – All functions I Description The TDA7541 is a high performance tuner circuit with stereo decoder for AM/FM car radio. It contains a mixer, IF amplifier, demodulator for AM and FM, stereo decoder, quality detection, ISS filter and PLL synthesizer with IF counter on a single chip ...
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... Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . 29 Weak signal mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Weather band input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Functional description of the multipath detector . . . . . . . . . . . . . . . . . . 36 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 36 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Doc ID 13686 Rev 4 TDA7541 ...
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... TDA7541 2 4 bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.1 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.2 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Appendix A Block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Appendix B Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Doc ID 13686 Rev 4 Contents 3/75 ...
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... Addr 19 SD High cut (2Fh Table 36. Addr (FM 97h, AM 3Fh Table 37. Addr 21 SD Quality (FFM 7Ah, AM FAh Table 38. Addr (FM 05h, AM 04h Table 39. Addr (FM E2h, AM C2h Table 40. Addr 24, 26, 27, 28, 29 testing (FEh Table 41. Addr 25 Testing (FEh Table 42. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 4/ bus Doc ID 13686 Rev 4 TDA7541 ...
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... TDA7541 List of figures Figure 1. Block circuit diagram Figure 2. Pin connections (top view Figure 3. Programming of HC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Figure 4. Programming of stereo blend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 5. Adaptive threshold control of noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Figure 6. Stereo blend controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 7. Deviation controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 8. LQFP64 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Figure 9 ...
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... Block circuit diagram 1 Block circuit diagram Figure 1. Block circuit diagram 6/75 Doc ID 13686 Rev 4 TDA7541 ...
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... TDA7541 2 Pin connection and pin description 2.1 Pin connections Figure 2. Pin connections (top view) VCCMIX1 DEVTC AMMIX1IN AMRFAGCOUT WB AMMIX1RAF AMPINDR FMMIX1IN1 GNDRF FMMIX1IN2 TV FMPINDR FMAGCTC VCOB VCOE VCCVCO 2.2 Pin description Table 2. Pin description Pin No. 1 VCCMIX1 2 DEVTC 3 AMMIX1IN 4 AMRFAGCOUT 64 63 ...
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... ISS Filter Time Constant1 (slow) ISS Filter Time Constant2 (fast) Xtal Oscillator to MOS Drain Digital Ground Stereo Decoder Output Left Stereo Decoder Output Right Digital Supply Weighted Field Strength Output Stereo Decoder Ground Multipath Detector Time Constant Doc ID 13686 Rev 4 TDA7541 Function ...
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... TDA7541 Table 2. Pin description (continued) Pin No. 40 AMREFDEMC 41 MPXIN 42 MUTETC 43 MPXOUT 44 AMIF2REF 45 FMREFDEMC 46 GNDDEM 47 AMIF2IN 48 VREF1 49 GNDVCC2 50 MIX2AMPOUT 51 VCC2 52 MIX2REF 53 MIX2OUT 54 AMRFAGCTC 55 MIX2INREF 56 MIX2IN 57 AMAGC2TC 58 IF1REF 59 IF1AMPOUT 60 VCCIF1 61 IF1AMPIN 62 GNDIF1 63 MIX1REF 64 MIX1OUT Pin connection and pin description Pin name AM Demodulator Reference ...
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... Parameter Parameter Conditions - - - Human Body Model Machine Model Charged Device Model = CC2 CCMIX1 CCVCO Test conditions - - - - - Doc ID 13686 Rev 4 TDA7541 Value Max. 70 Value 9.5 - -55 to +150 2 100 300 = 8 10.25 MHz, CCIF Xtal Min. Typ. Max. 7.7 8.5 9 7.7 8.5 9 7.7 8 ...
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... TDA7541 Table 5. Globals (continued) Item Symbol Parameter 1.10 I Supply current CCVCO 1.11 I Supply current CCMIX1 1.12 I Supply current CCMIX1 1.13 I Supply current CCIF 2. Reference voltages 2.1 V Internal reference voltage REF1 2.2 V Internal reference voltage REF2 bus interface 3.1 f Clock frequency SCL 3 ...
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... RMS 12 Differential Differential - - Unloaded With 330 Ω load - Referred to diff. mixer input - PH Ratio wanted/image With phase adjust Single ended - - unloaded Source impedance 400 Ω Doc ID 13686 Rev 4 TDA7541 Min. Typ. Max. Unit - - 0.5 V -33 -25 -17.5 µA 1.7 2.5 3 µ -16 mA kΩ 8 ...
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... TDA7541 Table 6. FM section (continued) Item Symbol Parameter 10.7 G Min. gain min 10.8 G Max. gain max Equivalent input noise 10.9 INOISE voltage 10. compression point 1dB rd 10.11 IIP3 3 order Intermodulation 11. Mixer2 (450kHz) 11.1 R Input resistance IN 11.2 C Input capacitance IN 11 input voltage 55.56 11 ...
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... FMON=1, 56 SL=”101” FSU FSU dBμV, FMON = 0, 47 SL= ”010” dBμV, FMON = 0, 47 SL= ”010” dBμV, FMON = 0, 47 SL= ”010” V > 100 dBμV, FMON = 0, 47 SL= ”010” FMON=0 FMON=0 Doc ID 13686 Rev 4 TDA7541 Min. Typ. Max. Unit 2 3 4.6 - ...
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... TDA7541 Table 6. FM section (continued) Item Symbol Parameter Adjacent channel gain 13.21 G Gain AC Adjacent channel filter 13. frequency highpass ACF=0 HP 13.23 f Attenuation 20dB -20dB 13.24 f Centre frequency BP Multipath channel gain 13.25 G Gain MP Multipath bandpass filter 13.26 f Centre frequency C 13.27 Q Quality factor 14. ISS (intelligent selectivity system) filter 450kHz 14 ...
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... TDEV DWTH µA 3 DWTH µA 3 DTH DTH WMTH = 0, WMD = WMTH = 7, WMD = WMD = 0, WMTH = 7, V =OFF 56 WMD = 7, WMTH = 7, V =OFF 56 WMD, WMTH ACMTH ACMD - - - - - - Doc ID 13686 Rev 4 TDA7541 Min. Typ. Max. Unit - -40 -32 -20 µA -48 -39 -30 µA 0.5 1 1.5 µA 5.5 8 10.5 µ ...
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... TDA7541 3.3.3 AM section °C, V amb CC1 MHz 30 Table 7. AM section Item Symbol Parameter 17. Global 17.1 V Usable sensitivity ANT_US 17.2 (S+N)/N Signal to Noise Ratio 17.3 a IF1 rejection IF 17.4 V Min. RF AGC threshold 3 17.5 V Max. RF AGC threshold 3 17.6 V Min. IF AGC threshold 61 17.7 V Max. IF AGC threshold 61 17 ...
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... kΩ kΩ, max gen noise of R not included gen G , referred to 2 kΩ input max G , referred to 2 kΩ input max dBV off 56 Doc ID 13686 Rev 4 TDA7541 Min. Typ. Max. Unit Ω 265 330 396 - 2 3.8 4 4.2 V 100 - - kΩ 3.7 4.0 4.3 V ...
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... TDA7541 Table 7. AM section (continued) Item Symbol Parameter 24. AMAGC2 24.1 V AGC start voltage (PIN47) AGC(start) Δ 24.2 AGC AGC2 range 24.3 g Control slope AGC 24.4 g Control slope AGC 24 Max. AGC charge current 57 24 Max. AGC charge current 57 24.7 V Max. AGC output voltage 57 24 ...
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... MHz, CCIF Xtal Min. Typ. Max. - 0.5 0.93 - 0.05 0.06 80 100 120 2 2 0. 18.9 - 19.1 rms 135 150 165 200 225 250 4.5 6.5 8.5 TDA7541 Unit V rms kΩ rms mV rms mV rms mV rms kHz % μs μs μs μs dB ...
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... TDA7541 Table 8. Stereo decoder section (continued) Item Symbol Parameter 30.6 A Max. Attenuation in AM Ammax 31. Stereo blend and high cut control 31.1 LG Min. level gain min 31.2 LG Max. level gain max 31.3 LG Level gain step Resolution - step 31.4 VSBL Min. voltage for mono min 31 ...
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... Signal PEAK in testmode, NBRR=10 Signal PEAK in testmode, NBRR=11 Signal PEAK in testmode, V =1V, NBSMP=0, NBMP=1, MPTC NBRR=01 Signal PEAK in testmode 1V, NBSMP = 1, MPTC NBMP = 0, NBRR = 01 Signal PEAK in testmode MBSMP=1, MPTC NBMP=1, NBRR=01 Doc ID 13686 Rev 4 TDA7541 Min. Typ. Max. Unit - 450 - 1200 - 0 1.9 ...
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... TDA7541 Table 8. Stereo decoder section (continued) Item Symbol Parameter 38. Multipath detector 38.1 G Min. multipath gain MP 38.2 G Max. multipath gain MP 38.3 G Min. rectifier gain RECTMP 38.4 G Max. rectifier gain RECTMP 38.5 I Rectifier charge current CHMP 38.6 I Rectifier charge current CHMP 38.7 I Rectifier discharge current - DISMP 39 ...
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... CCIF Xtal Min. Typ. Max. 160 - - - - 260 - 10.25 - 110 - - - 400 - - 2 0. 23 550 - 500 - - 1 1.9 - -0.1 - 0.1 -0.1 - 0.1 - 0.05 0 CCVCO CCVCO - 0.5 0. TDA7541 Unit MHz MHz √ dBc/ Hz MHz √ dBc rms ppm/V ppm/K μA μA μA μ μA μ ...
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... TDA7541 Table 9. PLL section (continued) Item Symbol Parameter 43.6 I Output current, source OUT 44. Output of tuning voltage (TV) 44.1 V Output voltage OUT 44 Min. voltage step step 44 Max. voltage offset max Δ 44.4 V Additional offset voltage 44.5 R Output impedance OUT 44.6 R Output impedance OUT 45 ...
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... ISS filter control signals in weak signal condition possible to combine the IF counter result with this voltage VFSWO by programmable comparator threshold (SSTH). 26/ This internal voltage V FSUint FSUint Doc ID 13686 Rev 4 C bus. is used for AM IF noise blanker bus (FSWO and SL) for TDA7541 ...
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... TDA7541 Adjacent channel detector The input of the adjacent channel detector is AC coupled from VFSW. A programmable high-pass or band-pass (ACF) as well as rectifier generate a signal which is compared with adjustable threshold (ACTH). The output signals of this comparator is controlling the charge and discharge of the external capacitor at PIN30 or PIN31 (dependent on SEEK) with programmable discharge current (TISS) ...
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... ISS filter is in automatic control mode 0 1 Filter activation defined by control table mode1 band width fixed to 80 kHz ISS filter is in automatic control mode 1 1 Filter activation defined by control table mode2 band width fixed to 80 kHz Doc ID 13686 Rev 4 TDA7541 Notes ...
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... TDA7541 “0”: 120 kHz The bit has only influence if bit BWENA is “1” bit ISSON is “1” WBON Weather band enable “1”: Weather band enable (FMmixer1 is disabled, Wbmixer1enabled, stereo decoder gain 26dB, ISS filter bandwidth 24 kHz,IF2Q=”00”) “0”: Weather band disable For weather band enable it is need to set ISSON = “ ...
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... Two 10.7 MHz ceramic filters before mixer2 input increase 900 kHz attenuation. 30/75 sm dev dev+ inton Doc ID 13686 Rev 4 Mode1 Mode2 int80 Function inton int80 0 wide wide wide narrow wide wide narrow narrow mid mid 1 1 TDA7541 Function wide wide wide narrow mid wide mid narrow mid narrow ...
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... Stereo decoder 4.3.1 Decoder The stereo decoder-part of the TDA7541 contains all functions necessary to demodulate the MPX-signal, like pilot tone-dependent MONO/STEREO switching as well as the stereo blend and high cut. Adaptations like programmable input gain, roll-off compensation, selectable deemphasis time constant and a programmable field strength input allow easy adoption to different applications ...
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... VPTHST. Two different thresholds are available. The status of the detector output can be checked by reading the status byte of the 2 TDA7541 via I C bus or by reading the STEREO status at MUX pin23. Field strength control The field strength input is used to control the high cut- and the stereo blend-function. In addition the signal can be also used to control the noise blanker thresholds and as input for the multipath detector ...
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... TDA7541 compensation bits in byte 14 to simplify a possible adaptation during the production of the car radio. Stereo blend control The stereo blend control block converts the internal LEVEL-voltage into a demodulator compatible analog signal, which is used to control the channel separation between 0dB and the maximum separation. Internally this control range has a fixed upper limit, which is the internal reference voltage VREF1 ...
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... Doc ID 13686 Rev 4 voltage. The PEAK voltage a DC threshold PEAK voltage increases due to the higher PEAK voltage the trigger threshold PEAK 1200 mV (00) 950 mV (01) 700 mV (10) 450 mV (11) Noise Controlled Trig. Threshold V 1.5 V Peak TDA7541 PEAK ...
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... TDA7541 Figure 6. Stereo blend controlled threshold adjust V PEAK ≈ 3V NOISE Automatic deviation controlled threshold adjustment If the system is tuned to stations with a high deviation the noise blanker can trigger on the higher frequencies of the modulation. To avoid this wrong behavior, which causes noise in the output signal, the noise blanker offers a deviation-dependent threshold adjustment. By rectifying the MPX signal a further signal representing the actual deviation is obtained ...
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... MPCC. 4.3.4 Quality detector The TDA7541 offers a quality detector output, which gives a voltage representing the FM- reception conditions. To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the following formula: The V signal is described in noise blanker session ...
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... TDA7541 4.4 PLL and IF counter section 4.4.1 PLL frequency synthesizer block This part contains a frequency synthesizer and a loop filter for radio tuning system. Only one VCO is required to build a complete PLL system for FM world tuning and AM up conversion. VCO and dividers The varactor tuned LC oscillator together with the dividers provides the local oscillator signal for both AM and FM front-end mixers ...
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... I C bus interface The TDA7541 supports the I data onto the bus as a transmitter, and the receiving device as the receiver. The device that controls the transfer is a master and device being controlled is the slave. The master will always initiate data transfer and provide the clock to transmit or receive operations. ...
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... The TDA7541 connected to the bus will compare their own hardwired address with the slave address being transmitted, after detecting a START condition. After this comparison, the TDA7541 will generate an "acknowledge" on the SDA line and will do either a read or a write operation according to the state of R/W bit. ...
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... After each word receipt the TDA7541 will answer with an "acknowledge". Read operation If the master sends a slave address word with the R/W bit set to "1", the TDA7541 will transmit one 8-bit data word. This data word includes the following informations. bit0 (ISS filter ON OFF) ...
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... TDA7541 5 Software specification 7.1 Chip address and overview The interface protocol comprises: – - start condition (S) – - chip address byte – - sub address byte – - sequence of data (N bytes + Acknowledge) – - stop condition (P) Receive mode Transmission mode Start P = Stop ACK = Acknowledge D = Device address ...
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... PCM VCON NBSMP - - - - IFSEXP Doc ID 13686 Rev 4 TDA7541 WMTH2 WBON AINTH3 AINTH2 AINTH1 XTAL3 XTAL2 XTAL1 IF2A3 IF2A2 IF2A1 PH3 PH2 PH1 KAGC3 KAGC2 ODCUR ROC3 ROC2 ROC1 PTH SBC2 SBC1 HCHT3 HCMAX2 HCMAX1 MPRG3 MPRG2 MPG1 QNG3 QNG2 QDC1 NBLT3 ...
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... TDA7541 5.2 Control register function 2 Table 14 control bit description Register name ACF Adjacent channel detector filter select ACMD Adjacent channel mute depth ACMTH Adjacent channel mute threshold ACTH Adjacent channel detector threshold AINENA AM IF noise blanker enable AINT AM IF noise blanking time ...
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... Audio noise blanker rectifier discharge resistor NBSMP Strong multi path influence on audio noise blanker NBT Audio noise blanker time constant ODCUR Current for over deviation correction ODENA Over deviation correction enable PC Tuner PLL counter PCM Pilot cancellation mode 44/75 Function Doc ID 13686 Rev 4 TDA7541 ...
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... TDA7541 2 Table 14 control bit description (continued) Register name PH IQ mixer phase adjust PTH Pilot detector threshold QDC Stereo decoder quality detector coefficient QNG Stereo decoder quality noise gain RC Tuner PLL reference counter RFAGC FM/AM RF AGC threshold RFK FM RF keying AGC ROC ...
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... Local mode enable ASFC - - - Weak signal mute and AGC normal mode in FM Weak signal mute and AGC on hold in FM mode SEEK - - - ISS time constant at pin 30 available, AM SEEK “OFF” ISS time constant at pin 31 available, AM SEEK “ON” Doc ID 13686 Rev 4 TDA7541 Function Function ...
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... TDA7541 Table 17. Addr 1 TPLL Counter 1 (LSB) MSB Table 18. Addr 2 TPLL Counter 2 (MSB) MSB Note: Swallow mode: fVCO/fSYN = LSB + MSB + 32 Table 19. Addr 3 TV(00h) MSB LSB PC<7:0> LSB = LSB = LSB = LSB = 252 LSB = 253 LSB = 254 LSB = 255 LSB PC<15:8> MSB = MSB = 256 ...
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... FMON - - - - - Select AM mode Select FM mode Doc ID 13686 Rev 4 Function = 20.48 ms (FM) 128 ms (AM ) Sample = 10.24 ms (FM (AM ) Sample = 5.12 ms (FM (AM ) Sample = 2.56 ms (FM (AM ) Sample = 1.28 ms (FM (AM ) Sample = 0.64 ms (FM (AM ) Sample = 0.32 ms(FM (AM ) Sample = 0.16 ms (FM (AM ) Sample TDA7541 ...
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... TDA7541 Table 21. Addr 5 TPLL Divider (FM 3Dh , AM 2Dh) MSB LSB VCOD<2:0> not valid (only for testing VCO frequency divided VCO frequency divided original VCO frequency 0 VCO ”I” signal 0 degree 1 VCO “I” signal 180 degree RC<5:3> PLL reference frequency 2 kHz PLL reference frequency 9 kHz ...
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... dBµ 8- dBµ 8- dBµ dBµ dBµ dBµ dBµ dBµ dBµ dBµ dBµ dBµ dBµ dBµ LNA Pin/FET mode ”OFF” TDA7541 = 92 dBµ dBµ 102 dBµ 104 dBµ dBµ dBµ dBµV = 102 dBµ dBµ dBµ dBµ dBµV ...
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... TDA7541 Table 23. Addr 7 Quality AC (FM 50h) MSB LSB d1 d0 ISSBW - 0 ISS filter fixed band width 120 kHz 1 ISS filter fixed band width 80 kHz BWDEF 0 - Disable bit ISSBW for ISS filter band width control 1 Enable bit ISSBW for ISS filter band width control ...
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... AC mute OFF ACMD - - - Adjacent channel mute depth -4 dB Adjacent channel mute depth -6 dB MPENA - - - Multipath control “ON” Multipath control “OFF” MPAC - - - Multipath eliminates ac (MPENA = 0) Multipath eliminates ac and ac+ (MPENA = 0) MPTH<7:6> MP threshold 0. threshold 0. threshold 1. threshold 1.25 V Doc ID 13686 Rev 4 TDA7541 Function ...
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... TDA7541 Table 25. Addr 9 Quality Dev (FM 49h) MSB LSB TDEV<2:0> charge current 39 µA, discharge current 1 µ charge current 38 µA, discharge current 2 µ charge current 37 µA, discharge current 3 µ charge current 36 µA, discharge current 4 µ charge current 33 µA, discharge current 7 µ charge current 32 µA, discharge current 8 µA DWTH< ...
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... ISS filter internal control 1 ISS filter forced “ON” WBON - 0 - Weather band disable 1 Weather band enable WMTH<4:2> 0 Startpoint mute 0 1 Startpoint mute Startpoint mute Startpoint mute 6 1 Startpoint mute 7 WMD<7:5> Mute depth 0 Mute depth Mute depth 5 - Mute depth 7 Doc ID 13686 Rev 4 TDA7541 Function Function ...
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... TDA7541 Table 28. Addr (AM B1h) MSB Table 29. Addr 13 XTAL adjust(80h) MSB LSB AINENA - - noise blanker disable noise blanker enable AINTH<4:1> not recommended - - - 1 0 not recommended Threshold Threshold 62 Threshold 100 Threshold 187.5 mV AINT<6:5> Time 8 µ Time 11 µ Time 14 µ Time 17 µs IFAGCS - - - ...
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... AM Q=28/gain=26 dB, FM Q=28/gain=16 dB int - - - R =5 kOhm, FM Q=3/gain=14 dB, BW=150 kHz int R =4,1 kOhm, FM Q=2,5/gain=14 dB, BW=180 kHz int R =3,3 kOhm, FM Q=2,05/gain=14 dB, BW=220 kHz int IF1G<7:6> IF1 gain 9 dB (AM IF1 gain 12 dB IF1 gain 17 dB IF1 gain 21 dB (FM) Doc ID 13686 Rev 4 TDA7541 Function ...
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... TDA7541 Table 31. Addr 15 IQ adjust / Switch (FM E7h) MSB LSB PH<3:0> degree degree degree - - - - degree degree degree - - - degree degree LOW output voltage S1 HIGH output voltage SWM - - - S1 emitter output available S1 open collector output available DSB<7:6> FM demodulator spike cancelation ”OFF” Threshold for FM demodulator spike cancelation 630 mV ...
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... KAGC threshold 3,75 KAGC threshold 3,80 KAGC threshold 3,85 KAGC threshold 3,90 Keying AGC “OFF” RFK - - - RF keying AGC OFF RF keying AGC ON FSWO<7:6> FSW offset OFF - - - FSW offset = -75 mV FSW offset = -150 mV FSW offset = -192 mV Doc ID 13686 Rev 4 TDA7541 Function / ...
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... TDA7541 Table 33. Addr 17 Roll off / Level gain (77h) MSB LSB ROC<3:0> Roll-Off compensation 25 Roll-Off compensation 24 Roll-Off compensation 22 Roll-Off compensation 20 Roll-Off compensation 18 Roll-Off compensation 17 Roll-Off compensation 15 Roll-Off compensation 13 Roll-Off compensation 12 Roll-Off compensation 10 Roll-Off compensation 9 Roll-Off compensation 7 Roll-Off compensation 6 Roll-Off compensation 4 Roll-Off compensation 3,0 % ...
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... Stereoblend control REF5V PTH - - - Pilot threshold high Pilot threshold low ASI - - - Audio inverter “OFF” Audio inverter “ON” AMCF<7:5> AM attenuation @ 3.5 kHz = 6 attenuation @ 3.5 kHz = 7 attenuation @ 3.5 kHz = 9 attenuation @ 3.5 kHz = 13 attenuation @ 3.5 kHz = 13.8 dB Doc ID 13686 Rev 4 TDA7541 Function ...
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... TDA7541 Table 35. Addr 19 SD High cut (2Fh) MSB LSB HCENA - - 0 High cut “OFF” 1 High cut “ON” HCMAX<2:1> Maximum high cut Maximum high cut 5 Maximum high cut 7 Maximum high cut 8.5 dB HCHT<4:3> Start level high cut @ 42 % REF5V - - - Start level high cut @ 50 % REF5V ...
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... Multipath detector charge current =0,8 µA Multipath detector charge current =0,4 µA MPINT - - - Multipath detector internal influence “ON” Multipath detector internal influence “OFF” MPFAST - - - External time constant (MPTC) enable External time constant (MPTC) disable Forced MONO MONO/STEREO switch automatically Doc ID 13686 Rev 4 TDA7541 Function ...
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... TDA7541 Table 37. Addr 21 SD Quality (FFM 7Ah, AM FAh) MSB LSB QDC<1:0> Quality detector coefficient a=0 Quality detector coefficient a=0, Quality detector coefficient a=0 Quality detector coefficient a=1,05 QNG<3:2> 0 Quality noise gain = Quality noise gain = Quality noise gain = Quality noise gain =15 dB NBDC< ...
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... Noise blanker low threshold 185 mV Noise blanker low threshold 166 mV Noise blanker low threshold 147 mV NBCT<7:6> Noise blanker noise controlled threshold 1200 Noise blanker noise controlled threshold 950 mV Noise blanker noise controlled threshold 700 mV Noise blanker noise controlled threshold 450 mV Doc ID 13686 Rev 4 TDA7541 Function ...
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... TDA7541 Table 39. Addr (FM E2h, AM C2h) MSB Table 40. Addr 24, 26, 27, 28, 29 testing (FEh) MSB Table 41. Addr 25 Testing (FEh) MSB LSB NBPC - - 0 Noise blanker peak charge current low 1 Noise blanker peak charge current high NBRR<2:1> Noise rectifier discharge resistor = infinite Noise rectifier discharge resistor =56 k ...
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... Doc ID 13686 Rev 4 TDA7541 OUTLINE AND MECHANICAL DATA LQFP64 ( 1.4mm 0.08mm ccc Seating Plane C K 0051434 F ® ...
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... TDA7541 Appendix A Block diagrams Figure 9. Block diagram FM part Doc ID 13686 Rev 4 Block diagrams 67/75 ...
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... Block diagrams Figure 10. Block diagram VCO 68/75 Doc ID 13686 Rev 4 TDA7541 ...
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... TDA7541 Figure 11. Block diagram ISS function Doc ID 13686 Rev 4 Block diagrams 69/75 ...
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... Block diagrams Figure 12. Block diagram AM path 70/75 Doc ID 13686 Rev 4 TDA7541 ...
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... TDA7541 Figure 13. Block diagram stereo decoder MPXOUT Figure 14. Block diagram audio noise blanker MPXIN 140kHz HPF FMDEMOut (2nd. order) MPXIN MPTC FSTC FMON Deviation detector NBDC Integrator discharge control Rectifier NBMP NBPC NBSMP NBRR MPTC Doc ID 13686 Rev 4 Block diagrams Stereo decoder S& ...
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... Block diagrams Figure 15. Block diagram multi path detection for stereo decoder FSTC MUX FS internal 72/75 Attack/Decay Rectifier Bandpass 19kHz MPG Doc ID 13686 Rev 4 MPINT MPCC MPFAST/ SEEK Rectifier MPRG MPTC TDA7541 Stereo blend ...
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... TDA7541 Appendix B Application circuit Figure 16. Application circuit Doc ID 13686 Rev 4 Application circuit 73/75 ...
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... Modified the Section 4.3.3 on page 3 Modified the Table 20 on page Updated the Figure 13 on page 4 Updated Section 6: Package information on page Doc ID 13686 Rev 4 TDA7541 Changes diagram. Section 3.3: Electrical specification. Table 8 36. 48. 71. 66. the ...
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... TDA7541 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...