TDA7427 ST Microelectronics, TDA7427 Datasheet
TDA7427
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TDA7427 Summary of contents
Page 1
... STAND-BY MODE FOR LOW POWER CON- SUMPTION HIGH CURRENT SOURCE FOR 0.5ms LOCK-IN TIME DIGITAL PORT EXTENSION WITH TWO OUTPUTS FOR FLEXIBILITY IN APPLICA- TION 2 FULLY PROGRAMMABLE BUS DESCRIPTION The TDA7427 is a PLL frequency synthesizer BLOCK DIAGRAM 16 FM_IN SWITCH PRECOUNTER AM/FM :32/33 14 HFREF SWITCH SWM/DIR ...
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... TDA7427 ABSOLUTE MAXIMUM RATINGS Symbol V Supply Voltage DD1 V Supply Voltage DD2 P Total Power Dissipation tot T Storage Temperature stg T Ambient Temperature amb PIN CONNECTION LP_FM LP_HC LP_AM VREF OSCIN OSCOUT DOUT3 SCL SDA IF_AM THERMAL DATA Symbol R Thermal Resistance Junction-Ambient th j-amb 2/21 Parameter ...
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... PIN DESCRIPTION (TDA7427/D) PIN SYMBOL 1 LP_FM Filter OPAMP input, charge pump output (FM mode) Filter OPAMP input, charge pump output (high current LP_HC 2 mode) 3 LP_AM Filter OPAMP input, charge pump output (AM mode) 4 VREF OPAMP reference voltage 5 OSCIN Oscillator reference clock input OSCOUT Oscillator output ...
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... TDA7427 ELECTRICAL CHARACTERISTICS (T wise specified). Symbol Parameter V Supply Voltage DD1 V Supply Voltage DD2 I Supply Current DD1 I Supply Current DD2 I Supply Current DD1 STB RF INPUT (AM_IN, FM_IN) f Input Frequency AM iAM f Input Frequency FM iFM V Min Input Voltage AM iMIN V Max Input Voltage AM iMAX V Min Input Voltage FM ...
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... PD = Tristate ( DD1 out I = -0.2mA OUT I = 0.2mA 9.5 OUT 0.5 to 9.5V 10 OUT I = -0.1mA OUT I = 0.1mA V *0.2 OUT DD1 V = 10V -1 OUT I = -1mA OUT V = 0.5 to 9.5V OUT TDA7427 Typ. Max. Unit 0.15 0.4 V 100 100 MHz ...
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... TDA7427 GENERAL DESCRIPTION This circuit contains a frequency synthesiser and a loop filter for use in FM/AM radio tuning sys- tems. Only a VCO is required to build a complete PLL system. For auto search/stop operation an IF counter system is available. For FM and SW AM application, the counter works in a two-stage configuration. The first stage is a swallow counter with a two modulus (:32/33) precounter ...
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... Lock detector enable CURRH Set current high OSC Oscillator adjust DOUT1 Push pull output 5V DOUT3 Open collector output INLOCK Lock detector output REGISTER R0 ...R15 fref PD PREDIVIDER fsyn : R REGISTER PC0 ...PC4 COUNTER A REGISTER PC5 ... P15 PRESCALER COUNTER M/M D95AU375A FUNCTION TDA7427 TO CHARGE PUMP 7/21 ...
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... TDA7427 Figure 2. AM direct mode operation for SW, MW and LW OSC DIVIDER FROM VCO FREQUENCY TO REFERENCE FREQUENCY This divider provides a low frequency f phase is compared with the reference frequency controlled by the registers PC0 to PC4 REF and PC5 to PC15 OPERATING MODES Four operating modes are available fo PLL ...
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... Figure 3. Phase comparator waveforms Figure 4. IF Counter internal block diagram IFENA IF-AM IF-FM OSC 14 BIT COUNTER IFC-REGISTER EW-REGISTER 11-21 BIT COUNTER ZD CF-REGISTER UP/DOWN COUNTER 3 BIT COUNTER DECODE IFS-REGISTER D95AU377A TDA7427 SSTOP 9/21 ...
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... TDA7427 The negative input is switchable to three input pins ( LPIN 1, LPIN 2 and LPIN 3) to increase the flexibility in application. This feature allows two separate active filters for different applications A logical ”1” in the LPIN 1/2 register activates pin LPIN 1, otherwise pin LPIN 2 is active. While the high current mode is activated LPIN 3 is switched on ...
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... When set to ”1”, a read operation is selected - When set to ”0”, a write operation is selected The chip selection is accomplished by setting the bit of the chip address to the corresponding status of the A0 input. All TDA7427 connected to the bus will compare their own hardwired address with the slave ad- AM-FM IF 1nF ...
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... This 8 bit address field provides an access to any of the 8 internal addresses. Upon receipt of the word address the TDA7427 slave device will re- spond with an ”acknowledge”. At this time, all the CHIP ADDRESS MSB ...
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... Select loop filter LP_AM LSB LSB = LSB = LSB = LSB = 252 LSB = 253 LSB = 254 LSB = 255 PC2 PC1 PC0 Bit name TDA7427 FUNCTION Subaddress = 00H FUNCTION Subaddress = 01H 13/21 ...
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... TDA7427 PLL COUNTER 2 (MSB) MSB PC15 PC14 PC13 PC12 PC11 Swallow mode: fvco/fsyn = LSB + MSB + 32 Direct mode: fvco/fsyn = LSB + MSB + 1 PLL REFERENCE COUNTER 1 (LSB) ...
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... Lock detector controlled chargepump D0 PM1 PM0 Bit name LSB LSB = LSB = LSB = LSB = 252 LSB = 253 LSB = 254 LSB = 255 IRC2 IRC1 IRC0 Bit name TDA7427 FUNCTION Subaddress = 05H FUNCTION Subaddress = 06H 15/21 ...
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... TDA7427 IF COUNTER REFERENCE CONTROL 2 (MSB) AND IF COUNTER MODE SELECT MSB IFCM1 IFCM0 IRC13 IRC12 IRC11 IRC10 fosc/ftim = LSB + MSB + 1 IF COUNTER CONTROL 1 MSB ...
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... AM-UPC) tsample = 320 s (FM mode); 2ms (AM; AM-UPC) tsample = 640 s (FM mode); 4ms (AM; AM-UPC) tsample = 1.280ms (FM mode); 8ms (AM; AM-UPC) tsample = 2.560ms (FM mode); 16ms (AM; AM-UPC) tsample = 5.120ms (FM mode); 32ms (AM; AM-UPC) tsample = 10.240ms (FM mode); 64ms (AM; AM-UPC) tsample = 20.480ms (FM mode); 128ms (AM; AM-UPC) TDA7427 Subaddress = 09H 17/21 ...
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... TDA7427 OSCILLATOR ADJUST MSB ...
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... DIM. MIN. TYP. MAX. MIN. TYP. a1 0.254 0.010 B 1.39 1.65 0.055 b 0.45 0.018 b1 0.25 0.010 D 25.4 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 I 3.93 L 3.3 0.130 Z 1.34 OUTLINE AND MECHANICAL DATA MAX. 0.065 1.000 0.280 0.155 DIP20 0.053 TDA7427 19/21 ...
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... TDA7427 mm DIM. MIN. TYP. MAX. MIN. A 2.35 2.65 0.093 A1 0.1 0.3 0.004 B 0.33 0.51 0.013 C 0.23 0.32 0.009 D 12.6 13 0.496 E 7.4 7.6 0.291 e 1. 10.65 0.394 h 0.25 0.75 0.010 L 0.4 1.27 0.016 K 0 (min.)8 (max 20/21 inch OUTLINE AND MECHANICAL DATA TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050 ...
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... The ST logo is a registered trademark of STMicroelectronics 1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com TDA7427 21/21 ...