TSH512CFT STMicroelectronics, TSH512CFT Datasheet

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Features ■ Supply voltage: 2.3 to 5.5 V ■ Carrier frequency range: 0 MHz ■ High versatility: I/O pins for each section ■ Two FM transmitters for stereo ■ Sinusoidal carriers for high spectral purity ■ Micro- or ...

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Contents Contents 1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 Device diagrams and schematics . . . . . . . . . . . . ...

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TSH512 1 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol oper T stg thjc R thja Latch-up ESD except pins 20 and 36 1. All voltage values, except differential voltage, ...

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Device diagrams and schematics 2 Device diagrams and schematics This section contains a detailed block diagram of the TSH512 accompanying pin description application (Figure 2 on page Figure 1. Block diagram 1 1 DEC2 DEC2 MIC-BIAS2 MIC-BIAS2 2 2 GND ...

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TSH512 Table 3. Pin descriptions Pin Pin name Related to 1 DEC2 TX2 2 MIC-BIAS2 TX2 3 GND - 4 VCC - 5 SBY TX1 & TX2 6 VOX-INTS TX1 & TX2 7 VOX-SENS TX1 & TX2 8 VCC - ...

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Device diagrams and schematics Table 3. Pin descriptions (continued) Pin Pin name Related to 36 VCO-A2 TX2 37 VCC - 38 VCO-BIAS2 TX2 39 PEA-OUT2 TX2 40 PEA-INN2 TX2 41 ALC-INT2 TX2 42 LNA-OUT2 TX2 43 LNA-INN2 TX2 44 LNA-INP2 ...

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TSH512 3 Electrical characteristics Table 4. Electrical characteristics for V (unless otherwise specified) Symbol Parameter Overall circuit Current consumption I CC_TOT TX1 and TX2 are on Current consumption with I TX2 in standby: SBY (pin5) CC_SBY active LNA sections (for ...

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Electrical characteristics Table 4. Electrical characteristics for V (unless otherwise specified) (continued) Symbol Parameter Audio LNA+ALC+PEA sections Total harmonic distortion in THD linear region on PEA-OUT1 ALC pin17 or PEA-OUT2 pin 39 Total harmonic distortion in THD AGC compression region ...

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TSH512 Table 4. Electrical characteristics for V (unless otherwise specified) (continued) Symbol Parameter Standby Maximum low level input V SBY_IL voltage of standby input maximum (SBY pin 5) Minimum high level input V SBY_IH voltage of standby input minimum (SBY ...

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Electrical characteristics Table 4. Electrical characteristics for V (unless otherwise specified) (continued) Symbol Parameter V BUF-OUT Output DC voltage DC H2 2nd harmonic level BUF-OUT H3 3rd harmonic level BUF-OUT 1. Limits over -40° C < Tamb < +85° C ...

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TSH512 Figure 6. Supply current vs. temperature 16 14 TX1+TX2+Buffers 2. (°C) AMB Figure 8. PEA output voltage vs. LNA input voltage 0.8 0.7 0.6 V ...

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Electrical characteristics Figure 12. MIC-BIAS voltage vs. MC-BIAS current 2.4 2.2 2.0 1.8 1 MIC-BIAS Figure 14. MIC-BIAS output voltage vs. temperature 2.4 2.3 2.2 2.1 -40 -30 -20 - ...

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TSH512 3.3 RF section Figure 16. VCO output voltage vs. R 700 V = 2.7V CC 650 L = 120µH (Q=30 2.8MHz CARRIER 600 550 500 450 400 350 300 10k 100k ( Ω VCO Figure ...

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Application information 4 Application information This section gives application information for some typical applications. 4.1 Infrared stereo transmitter application (stereo headphones) In this application, shown in by ALC. The carrier of each transmitter TX1 or TX2 of the TSH512 is ...

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TSH512 Figure 22. Application diagram 390pF C12 6-60pF SMV1212 39pF C9 100K 270K R7 R8 7K5 R13 R3 47 1uF C17 R2 5K6 R12 470K VCO-OUT2 34 VCO-B2 35 VCO-A2 36 VCC 37 VCO-BIAS2 38 47 PEA-OUT2 ...

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Application information 4.2 Sub-carrier generator application: voice-operated wireless camera Thanks to its operating frequency, the TSH512 offers the possibility of generating usual audio sub-carriers for video applications using the VOX-MUTE output of the TSH512. The TSH512 also provides bias, amplification, ...

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TSH512 Figure 24. Headset-side block diagram TSH511 & 512 supply: : 2.3 to 5.5V Voice transmitted to the PC TSH512 LNA + ALC TX2 MIC. BIAS VOX MIC. BIAS TX1 LNA + ALC 1.7 MHz filter filter Band-pass ...

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General description 5 General description The TSH512 is a 0.4- to 11-MHz dual FM analog transmitter. This circuit offers the functions needed for an advanced infrared STEREO transmitter. The access pins for each section allow high versatility and therefore a ...

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TSH512 Figure 26. LNA schematics The LNA gain is given by: G (dB) = 20.Log(1+R LNA The high-pass cut-off frequency is 1/(2.π.R HPF The lowpass filter cut-off frequency is 1/(2.π.R LPF If you connect an external ...

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General description Figure 27. Electret condenser microphone source The capacitor C in series with the microphone stops the DC coming from MIC-BIAS. The resistor R provides the DC from MIC-BIAS to supply the ECM. Thanks to the automatic level control ...

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TSH512 5.4 ALC section: automatic level control Both transmitters of the TSH512 include an automatic level control (ALC). When the level of the audio signal is too high, the ALC compresses the signal in order to avoid over- modulation of ...

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General description Figure 29. VOX delay and sensitivity schematics On pin 6, R and C peak filtered signal follows the audio amplitude. Figure 30. VOX integrator and monostable schematics The self-adaptive VOX threshold is necessary because the ambient background noise ...

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TSH512 The monostable holds the TSH512 in transmit mode during a delay fixed by the value of C connected to pin 29. TRIG Note that the VOX function is activated when the audio signal enters the first transmitter TX1. When ...

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General description 5.6 PEA section: pre-emphasis The amplitude-regulated audio coming from the ALC feeds the positive input of the operational amplifier called PEA (pre-emphasis). The pre-emphasis consists in a high-pass filter in order to compensate the behavior of the FM ...

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TSH512 5.7 VCO section: voltage-controlled oscillator Each TSH512 transmitter has its own oscillator to generate the carrier. The audio signal is applied to the varicap diode to perform the frequency modulation. Thanks to the VCO-BIAS voltage reference, the DC bias ...

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General description 5.8 Output buffer section The output buffers can deliver a sinusoidal signal with a 1.5 V This impedance is compatible with popular biasing circuitry of external transistor drivers of IR LEDs. The VOX-MUTE logic signal can be used ...

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TSH512 6 Package information In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ...

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Package information 6.1 TQFP44 package information Figure 34. TQFP44 package mechanical drawing Table 6. TQFP44 package mechanical data Ref ccc 28/31 Dimensions Millimeters Min. Typ. ...

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... TSH512 7 Ordering information Table 7. Order codes Part number TSH512CF TSH512CFT (1) TSH512CYFT 1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent. Temperature Package range TQFP44 -40° +85°C TQFP44 (automotive grade level) Doc ID 8120 Rev 7 ...

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Revision history 8 Revision history Table 8. Document revision history Date 08-Aug-2001 09-Sep-2001 01-Dec-2003 01-Apr-2005 14-Oct- 2005 13-Nov-2007 28-May-2009 30/31 Revision 1 First release corresponding to preliminary data version of datasheet. Datasheet updated for Maturity 30: – ESD sensitive device ...

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... TSH512 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. ...