TSH511 STMICROELECTRONICS | Alldatasheet
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Technical content
HiFi stereo/mono infrared receiver Stereo sub-carrier demodulator ■ Supply voltage: 2.3V to 5.5V ■ Carriers frequency range: 0.4 to 11 MHz ■ Two FM receivers for stereo ■ Integrated audio buffers ■ Audio outputs: 20 mW into 16 ohms ■ High sensitivity: 4µV @12dB SINAD ■ Flexibility: access pins for each section ■ Receiver 2 Standby for mono operation
DESCRIPTION
The TSH511 is a 0.4 to 11 MHz dual FM receiver. This circuit offers the functions needed for a highly sensitive infrared HiFi STEREO receiver. Featuring high input sensitivity and high input dy- namic range, each receiver integrates a RF front-end LNA, an intermediate amplifier with 2 ex- ternal filters, a voltage limiter, a quadrature FM de- modulator, and finally an audio buffer. The integrated audio buffers are able to drive di- rectly a 16 ohms headphone with 20mW. A SQUELCH circuit mutes both audio amplifiers. Access pins to each section makes the TSH511 suited for a wide field of applications. For MONO applications, the STANDBY pin en- ables one receiver only, reducing the supply cur- rent. The TSH511 forms a chipset with the dual trans- mitter TSH512.
APPLICATIONS
■ Infrared HiFi stereo receiver ■ Infrared Multimedia Headsets ■ Stereo sub-carrier demodulator ■ FM IF receiver systems ■ Power Line Carrier Intercoms ORDER CODE PACKAGE PIN CONNECTION (top view) Part Number Temperature Range Package Conditionning Marking TSH511CF -40°C to +85°C TQFP44 Tray TSH511C TSH511CFT -40°C to +85°C TQFP44 Tape & reel TSH511C F TQFP44 10 x 10 mm 12 13 14 15 16 17 18 19 20 21 22 3435363738394041424344 TSH511 Audio buffers Standby RX1 RX2 SQUELCH Vref LNA amp. limiter FM demodulator limiteramp. FM demodulator 12 13 14 15 16 17 18 19 20 21 22 3435363738394041424344 TSH511 Audio buffers Standby RX1 RX2 SQUELCH Vref LNA amp. limiter FM demodulator limiteramp. FM demodulator TSH511 December 2002
Symbol Parameter Value Unit Vcc Supply voltage1) 7V Toper Operating free air temperature range -40 to +85 °C Tstg Storage temperature -65 to +150 °C Tj Maximum junction temperature 150 °C Rthjc Thermal resistance junction to case 14 °C/W ESD except for pin 6 HBM: Human Body Model2) CDM: Charged Device Model3) MM: Machine Model4) 1.5 0.2 kV ESD only for pin 6 HBM: Human Body Model CDM: Charged Device Model MM: Machine Model 0.1 kV Latch-up Class 5) A 1. All voltages values, except differential voltage, are with respect to network ground terminal 2. ElectroStatic Discharge pulse (ESD pulse) simulating a human body discharge of 100 pF through 1.5kΩ 3. Discharge to Ground of a device that has been previously charged. 4. ElectroStatic Discharge pulse (ESD pulse) approximating a pulse of a machine or mechanical equipment. 5. Corporate ST Microelectronics procedure number 0018695 Symbol Parameter Value Unit Vcc Supply voltage 2.3 to 5.5 V faudio Audio frequency range 20 to 20,000 Hz fcarrier Carrier frequency range 0.4 to 11 MHz BUF-OUT2 BUF-OUT1 MUTE-OUT MUTE-INT MIX-IN2 BUF-IN2 12 13 14 15 16 17 18 19 20 21 22 3435363738394041424344 TSH511 Audio buffers Standby RX1 RX2 SQUELCH GND SBY1 SBY2 VCC DEC-OUT GND MUTE-IN GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC AMP-IN1 DEC-LNA AMP-OUT2 GND LIM-IN2 DEC-LIM2B LIM-OUT2 DEC-LIM2A VCC MIX-OUT2 GND AMP-OUT1 GND LIM-IN1 DEC-LIM1 LIM-OUT1 DEC-LIM1B MIX-IN1 VCC MIX-OUT1 GND BUF-IN1 Vref LNA amp. limiter FM demodulator limiteramp. FM demodulator BUF-OUT2 BUF-OUT1 MUTE-OUT MUTE-INT MIX-IN2 BUF-IN2 12 13 14 15 16 17 18 19 20 21 22 3435363738394041424344 TSH511 Audio buffers Standby RX1 RX2 SQUELCH GND SBY1 SBY2 VCC DEC-OUT GND MUTE-IN GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC AMP-IN1 DEC-LNA AMP-OUT2 GND LIM-IN2 DEC-LIM2B LIM-OUT2 DEC-LIM2A VCC MIX-OUT2 GND AMP-OUT1 GND LIM-IN1 DEC-LIM1 LIM-OUT1 DEC-LIM1B MIX-IN1 VCC MIX-OUT1 GND BUF-IN1 Vref LNA amp. limiter FM demodulator limiteramp. FM demodulator
Pin Pin name related to direction1) Pin description
1 GND - - GROUND
2 AMP-IN2 RX2 I Intermediate amplifier input
3 VCC - - SUPPLY VOLTAGE
4 LNA-OUT2 RX2 O Low Noise Amplifier output
5 VCC - - SUPPLY VOLTAGE
6 LNA-IN RX1 & RX2 I Low Noise Amplifier input
7 GND - - GROUND
8 LNA-OUT1 RX1 O Low Noise Amplifier output
9 VCC - - SUPPLY VOLTAGE
10 AMP-IN1 RX1 I Intermediate amplifier input
11 DEC-LNA RX1 & RX2 - Decoupling capacitor
12 AMP-OUT1 RX1 O Intermediate amplifier input
13 GND - - GROUND
14 LIM-IN1 RX1 I Limiter input
15 DEC-LIM1A RX1 - Decoupling capacitor
16 LIM-OUT1 RX1 O Limiter output
17 DEC-LIM1B RX1 - Decoupling capacitor
18 MIX-IN1 RX1 I Mixer input
19 VCC - - SUPPLY VOLTAGE
20 MIX-OUT1 RX1 O Mixer output (demodulated audio signal)
21 GND - - GROUND
22 BUF-IN1 RX1 I Audio buffer input
23 MUTE-IN RX1 & RX2 I Noise amplifier input (Squelch circuit)
24 MUTE-INT RX1 & RX2 - Capacitor connection of the noise rectifier
25 MUTE-OUT RX1 & RX2 O Capacitor connection (ramp generator to mute the audio)
26 BUF-OUT1 RX1 O Audio buffer output
27 GND - - GROUND
28 DEC-OUT RX1 & RX2 - Decoupling capacitor of Audio buffers
29 VCC - - SUPPLY VOLTAGE
30 BUF-OUT2 RX2 O Audio buffer output
31 SBY2 RX1 & RX2 I Standby 2
32 SBY1 RX1 & RX2 I Standby 1
33 GND - - GROUND
34 BUF-IN2 RX2 I Audio buffer input
35 GND - - GROUND
36 MIX-OUT2 RX2 O Mixer output
37 VCC - - SUPPLY VOLTAGE
38 MIX-IN2 RX2 I Mixer input
39 DEC-LIM2A RX2 - Decoupling capacitor
40 LIM-OUT2 RX2 O Limiter output
41 DEC-LIM2B RX2 - Decoupling capacitor
42 LIM-IN2 RX2 I Limiter input
43 GND - - GROUND
44 AMP-OUT2 RX2 O Intermediate amplifier output
- pin direction: I = input pin, O = output pin, - = pin to connect to supply or decoupling capacitors or external components
INFRARED STEREO HEADPHONE APPLICATION The right side of the figure shows the block-diagram of an infrared stereo receiver using the TSH511. The sensitive LNA directly connected to the photodiode does not require an external pre-amplifier. After filter- ing, the amplified signals are limited and demodulated with quadrature demodulators. The two integrated audio buffers directly drive the stereo headphones. The audio power reaches 2 x20mW in two 16Ω loads. The built-in squelch function fades-out the audio when the incoming infrared signal is low. The standby in- puts SBY1 and SBY2 enable only one receiver for the mono applications. Audio buffer1 Audio buffer2 SBY1 SBY2 SQUELCH LNA LNA + ALC LNA + ALC TX2 TX1 VOX SBY buffer1 buffer2 RX2 RX1 Line inputs Right channel Left channel Vcc LED photodiode filter filter
2.3 MHz
2.8 MHz
Vcc: 2.3 to 5.5V Current < 15 mA TSH512 TSH511 20 mW / 16 Ω 20 mW / 16 Ω Power supply: 2.3 to 5.5V Icc < 20 mA stereo IR stereo HiFi transmitter (Television) IR stereo HiFi receiver (Headphones) HiFi stereo: 2.3 & 2.8 M Hz carriers Audio buffer1 Audio buffer2 SBY1 SBY2 SQUELCHSQUELCH LNA LNA + ALC LNA + ALC TX2 TX1 VOX SBY buffer1 buffer2 RX2 RX1 Line inputs Right channel Left channel Vcc LED photodiode filter filter Vcc: 2.3 to 5.5V Current < 15 mA TSH512 TSH511 20 mW / 16 Ω 20 mW / 16 Ω Power supply: 2.3 to 5.5V Icc < 20 mA stereo IR stereo HiFi transmitter (Television) IR stereo HiFi receiver (Headphones) HiFi stereo: 2.3 & 2.8 M Hz carriers
MULTIMEDIA APPLICATION: HEADSET SIDE The TSH511 receives the HiFi stereo sound from the computer through 2.3 and 2.8 MHz stereo infrared carriers. The access pins to the RF amplifiers allow the use of a 1.7 MHz reject filter to cancel the trans- mitted signal of the microphone. The wide supply range (2.3 to 5.5 V) allows battery operation. MULTIMEDIA APPLICATION: COMPUTER SIDE In multimedia application, the TSH511 receives the voice of the user through the 1.7 MHz infrared carrier. The standby pins can disable the unused receiver and audio amplifier to reduce the supply current. TSH512 LNA + ALC LNA + ALC MIC. BIAS MIC. BIAS TX2 TX1 VOX SBY buffer1 buffer2 photodiode Vcc LED Vcc Audio buffer2 SBY1 SBY2 LNA HiFi stereo from the PC: 2x 20 mW /16 Ω
1.7 MHz
Voice transmitted to the PC Microphone Tx: Stereo Rx: 2.3 & 2.8 MHz filter TSH511 & 512 supply: 2.3 to 5.5V, 25 mA Audio buffer1 SQUELCH filter filter filter filter RX2 RX1 TSH512 LNA + ALC LNA + ALC MIC. BIAS MIC. BIAS TX2 TX1 VOX SBY buffer1 buffer2 photodiode Vcc LED Vcc Audio buffer2 SBY1 SBY2 LNA HiFi stereo from the PC: 2x 20 mW /16 Ω Voice transmitted to the PC Microphone Tx: Stereo Rx: 2.3 & 2.8 MHz filter TSH511 & 512 supply: 2.3 to 5.5V, 25 mA Audio buffer1 SQUELCH filter filter filter filter RX2 RX1 TSH512 LNA + ALC LNA + ALC MIC. BIAS MIC. BIAS TX2 TX1 VOX SBY buffer1 buffer2 photodiode Vcc LED Vcc Audio buffer2 SBY1 SBY2 LNA HiFi stereo from the PC: 2x 20 mW /16 Ω Voice transmitted to the PC Microphone Tx: Stereo Rx: 2.3 & 2.8 MHz filter TSH511 & 512 supply: 2.3 to 5.5V, 25 mA Audio buffer1 SQUELCH filter filter filter filter RX2 RX1 LNA + ALC LNA + ALC SBY buffer1 buffer2 LED photodiode TSH511 & 512 supply: 2.3 to 5.5V, 24 mA TSH512 Audio buffer1 Audio buffer2 SBY1 SBY2 SQUELCH LNA RX2 RX1 filter TSH511 Vcc1.7 MHz Band-pass HiFi stereo Tx: 2.3 & 2.8 MHz mono Rx: Voice from the headset microphoneHiFi stereo VOX TX2 TX1 LNA + ALC LNA + ALC SBY buffer1 buffer2 LED photodiode TSH511 & 512 supply: 2.3 to 5.5V, 24 mA TSH512 Audio buffer1 Audio buffer2 SBY1 SBY2 SQUELCHSQUELCH LNA RX2 RX1 filter TSH511 Vcc1.7 MHz Band-pass HiFi stereo Tx: 2.3 & 2.8 MHz mono Rx: Voice from the headset microphoneHiFi stereo VOX TX2 TX1
ELECTRICAL CHARACTERISTICS
Vcc = 2.7V, Tamb = 25°C, faudio = 1 kHz, fcarrier = 2.8 MHz, frequency deviation = +/-75 kHz (unless otherwise specified) Symbol Parameter Test condition Min Typ Max Unit Overall Circuit (refering to typical application schematic, without reject filters) ICC_OX Current consumption, RX1 is on, RX2 is on. SBY1 = ’Low’, SBY2 = X (X = don’t care) 15 18 mA I CC_10 Current consumption RX1 is on, RX2 is off RX1 audio buffer is on RX2 audio buffer is on SBY1 = ’High’, SBY2 = ’Low’ 11 13 mA I CC_11 Current consumption RX1 is on, RX2 is off RX1 audio buffer is on, RX2 audio buffer is off SBY1 = ’High’, SBY2 = ’High’ 9.5 11.5 mA MAUS Maximum Usable Average Sensitivity with audio SINAD=12 dB audio BW=30 kHz with audio SINAD=26 dB, audio BW=30 kHz µVRMS SN OUT Output audio signal to noise ratioVcarrier = 1 mVRMS , with psophometric filter 58 dB Vi Input limiting voltage output S/N reduced by 3dB, in BW = 30kHz output S/N reduced by 3dB, psophometric filter µVRMS THD Total Harmonic Distortion Vcarrier = 1 mVRMS , with psophometric filter 0.6 % Low Noise Amplifier (LNA) Section G LNA LNA voltage gain ZL= 2 kΩ, fcarrier = 10 MHz 18 22 28 dB BW LNA -3dB LNA Bandwidth ZL = 2 k Ω 20 MHz En_LNA Equivalent input noise voltage Rs = 0 Ω 3.4 nV/ √Hz In_LNA Equivalent input noise current Rs = 0 Ω 0.6 pA/ √Hz ZLNA_IN Input impedance definied as R LNA_IN in paralell with CLNA_IN R LNA_IN C LNA_IN kΩ pF ZLNA_OUT Output impedance 200 Ω P1dB_LNA 1dB compression point ZL= 2 kΩ ZL= 2 kΩ, fcarrier=10 MHz 127 mV RMS IIP3LNA Input 3rd order interception point ZL= 2 kΩ ZL= 2 kΩ, fcarrier=10 MHz mV RMS
Amplifier (AMP) Section G AMP Amplifier Voltage Gain ZL=2 kΩ, fcarrier=10 MHz 16 20 dB ZAMP_IN Input impedance defined as R AMP_IN in parallel with CAMP_IN R AMP_IN C AMP_IN kΩ pF ZAMP_OUT Output impedance 350 Ω P1dBAMP 1dB compression point ZL = 2 kΩ ZL = 2 kΩ, fcarrier=10 MHz 220 560 380 mV RMS BW AMP -3dB AMP Bandwidth ZL = 2 k Ω 11 MHz Limitor (LIM) Section G LIM Voltage gain ZL=15k Ω tied to GND 50 54 60 dB ZLIM_IN Input impedance defined as R LIM_IN in parallel with CLIM_IN R LIM_IN C LIM_IN kΩ pF V LIM_OUT Output Voltage ZL = 15 k Ω tied to GND 170 mV pp FM Demodulator Section VDEM Output voltage +-75 kHz FM deviation typical application schematic ZL = 4 kΩ 700 800 900 mV RMS ZDEM_OUT Output impedance 100 Ω Squelch Section ATT Audio attenuation on each receiver when audio buffers are muted. RX1 and RX2 audio buff- ers muted ZL = 16 Ω on both audio buffers 55 65 dB ZN_IN Noise Amplifier Input impedance 2 k Ω VN_TH Comparator threshold from MUTED to UNMUTED state, R MUTE = 22 kΩ, fIN = 100 kHz 9 mV RMS VN_HYS Comparator hysteresis R MUTE = 22 kΩ, fIN = 100 kHz 1 mV RMS IMUTE_SINK Current sinked on pin 25 to discharge C MUTE capacitor: ramp generator con- trolling the attenuation from ON to OFF states of audio buffers. Voltage on pin 25 = 1.7V 24 µA IMUTE_SOU RCE Current sourced on pin 25 to charge C MUTE capacitor: ramp generator con- trolling the attenuation from OFF to ON states of audio buffers. Voltage on pin 25 = 1.7V 14 µA Symbol Parameter Test condition Min Typ Max Unit
ZOD-IN Input Impedance 200 k Ω BW 1dB -1dB bandwith ZL = 16 Ω 35 kHz POUT_OD Output power ZL= 16Ω VOD_IN = 70mVRMS 15 20 mW THD OD Distortion in Line Driver mode Vout = 0.5 VRMS , ZL= 10kΩ 0.2 0.3 % THD OD Distortion in Power Amplifier mode with decoupling capacitor CDEC = 1µF/ceramic on pin 28. Pout = 20 mW, ZL = 16Ω 0.35 0.8 % VISOL Crosstalk: isolation between the two Audio Buffers Pout = 20 mW, ZL = 16Ω 51 dB Standby VSBY_L Low level input voltage of Standby inputs (Pins 31 & 32) 0.1xVCC V VSBY_H High level input voltage of Standby inputs (Pins 31 & 32) 0.9xVcc V TON Turn-on time from Standby mode to Active mode 0.5 µs TOFF Turn-off time from Active mode to Standby mode 0.5 µs Symbol Parameter Test condition Min Typ Max Unit
Supply current vs. Supply voltage S/N vs. 2.8 MHz Input Level PSOPH: Signal on Noise Ratio curve measured with a CCITT standard psophometric bandpass characteristic. It approximates the response of human hearing. Squelch Threshold vs. RMUTE Input Resistor Supply current vs. Temperature Sensitivity vs. Supply Voltage 0123456 RX1+ (RX1 Buffer) RX1+Buffers RX1+RX2+Buffers ICC (mA) VCC (V) 1 10 100 1000 PSOPH BW = 30 kHz VCC = 2.7 V Deviation = +/-75 kHz Total S/N (dB) Input Level (µV) 1 10 100 FIN = 100 kHz FIN = 1 MHz VCC = 2.7V VN_TH (mVRMS ) R MUTE (kΩ ) - 4 0 - 2 00 2 04 06 08 0 V CC = 2.7V TX1+TX2 TX1 TX1+Buffers TX1+TX2+Buffers ICC (mA) TAMB (°C) 2345 FCARRIER = 2.8MHz FMOD = 1 kHz Deviation = +/- 75kHz BW = 30 kHz Sensitivity (µV) @ 26 dB SINAD VCC (V)
Output THD+N vs. Output Power (RL = 16 Ω ) Output THD+N vs. Output Power (RL = 32 Ω ) Output THD+N vs. Output Power (RL = 600 Ω ) Output THD+N vs. Output Power (RL = 16 Ω ) Output THD+N vs. Output Power (RL = 32 Ω ) Output THD+N vs. Output Power (RL = 600 Ω ) 1 10 100 0.1 R L = 16 Ω F = 1 kHz BW = 30 kHz VCC = 5.5V VCC = 2.7V VCC = 2.3V THD+N BUFFER (%) POUT-BUF (mW) 11 0 1 0 0 0.1 RL = 32 Ω F = 1 kHz BW = 30 kHz VCC = 5.5V VCC = 2.7V VCC = 2.3V THD+N BUFFER (%) POUT-BUF (mW) 0.1 1 10 0.1 RL = 600 Ω F = 1 kHz BW = 30 kHz VCC = 5.5V VCC = 2.7V VCC = 2.3V THD+N BUFFER (%) POUT-BUF (mW) 11 0 1 0 0 0.1 F = 20 kHz F = 1 kHz RL = 16 Ω VCC = 2.7 VF = 20 Hz THD+N BUFFER (%) POUT-BUF (mW) 11 0 1 0 0 0.1 F = 20 kHz F = 1 kHz RL = 32 Ω VCC = 2.7 V F = 20 Hz THD+N BUFFER (%) POUT-BUF (mW) 0.1 1 0.1 F = 20 kHz F = 1 kHz RL = 600 Ω VCC = 2.7 V F = 20 Hz THD+N BUFFER (%) POUT-BUF (mW)
Output THD+N vs. Output Voltage (RL = 10kΩ ) Output THD+N vs. Frequency (RL = 16 Ω ) Output THD+N vs. Frequency (RL = 600 Ω ) Output THD+N vs. Output Voltage (RL = 10kΩ ) Output THD+N vs. Frequency (RL = 32 Ω ) Output THD+N vs. Frequency (RL = 10 kΩ ) 0.1 1 0.1 RL = 10 kΩ F = 1 kHz BW = 30 kHz VCC = 5.5V VCC = 2.7V VCC = 2.3V THD+N BUFFER (%) VOUT-BUF (Vrms) 100 1000 10000 0.1 VCC = 2.7 V Vin = 50 mVrms R L = 16 Ω THD+N BUFFER (%) Frequency (Hz) 100 1000 10000 0.1 VCC = 2.7 V Vin = 50 mVrms R L = 600 Ω THD+N BUFFER (%) Frequency (Hz) 0.1 1 0.1 F = 1 kHz F = 20 kHz RL = 10 kΩ VCC = 2.7 V F = 20 Hz THD+N BUFFER (%) VOUT-BUF (Vrms) 100 1000 10000 0.1 VCC = 2.7 V Vin = 50 mVrms R L = 32 Ω THD+N BUFFER (%) Frequency (Hz) 100 1000 10000 0.1 VCC = 2.7 V Vin = 50 mVrms RL = 10 kΩ THD+N BUFFER (%) Frequency (Hz)
Output Power vs. Temperature - 4 0 - 2 00 2 04 06 08 0 VCC = 2.7V R L = 16 Ω VIN = 70 mVRMS POUT-BUF (mW) TAMB (°C)
The TSH511 is a 0.4 to 11 MHz dual FM analogue receiver. The incoming signal is amplified with a 22 dB Low Noise Amplifier (LNA section). The good noise performance of the LNA allows the photodiode for infrared applications to be connect- ed directly to the TSH511 without any external preamplifier. The access pins for each section and the two standby configurations allow a high versa- tility for many applications: HiFi stereo infrared re- ceiver, mono/stereo subcarrier receiver, power line carrier audio. Figure 1 : TSH511 block diagram The LNA is common to both receivers but the out- put is split in two: one for each receiver. Each LNA output can be connected to a first optional filter for bandpass or reject filtering. The filtered signal is amplified with an intermedi- ate Amplifier (AMP section) followed by a second filter. The AMP sections have 20 dB typical gain. Finally, the signal is amplified and limited in the Limiter (LIM section). The 60 dB amplifier-limiter LIM provides a constant amplitude signal to the demodulator. It reduces AM parasitics demodula- tion in the FM demodulator. The FM demodulator is a classical quadrature de- tector using an external tank. The demodulated signal can be amplified by the Audio Buffer section after de-emphasis. Each Au- dio Buffer can drive a 16 ohms headphone with 20 mW power. The two standby pins SBY1 & SBY2 allow the sec- ond receiver RX2 to be put into standby for mono operation. In mono, it is possible to use both Audio Buffers or only one depending on the combination on SBY1 & SBY2. To avoid noise at the audio output, a Squelch sec- tion mutes the Audio Buffers when no carrier is re- ceived. The Squelch Section uses the demodulat- ed signal of the first receiver (RX1). This signal is highpass filtered, rectified and compared to a threshold to produce the Mute signal (pin 25). When no carrier is received on RX1, the wideband ’FM noise’ on the demodulator increases and the Mute signal mutes the both Audio Buffers. When the carrier is present, the wideband noise on the demodulator output decreases, enabling the Au- dio Buffers. Figure 2 : Infrared audio frequencies LNA section: Low Noise Amplifier The Low Noise Amplifier (LNA) has a typical gain of 22 dB to amplify the incoming RF signal from the photodiode. The LNA is common to both re- ceivers sections RX1 and RX2. Figure 3 : LNA schematic BUF-OUT2 BUF-OUT1 MUTE-OUT MUTE-INT MIX-IN2 BUF-IN2 12 13 14 15 16 17 18 19 20 21 22 3435363738394041424344 TSH511 Audio buffers Standby RX1 RX2 SQUELCH GND SBY1 SBY2 VCC DEC-OUT GND MUTE-IN GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC AMP-IN1 DEC-LNA AMP-OUT2 GND LIM-IN2 DEC-LIM2B LIM-OUT2 DEC-LIM2A VCC MIX-OUT2 GND AMP-OUT1 GND LIM-IN1 DEC-LIM1 LIM-OUT1 DEC-LIM1B MIX-IN1 VCC MIX-OUT1 GND BUF-IN1 Vref LNA amp. limiter FM demodulator limiteramp. FM demodulator BUF-OUT2 BUF-OUT1 MUTE-OUT MUTE-INT MIX-IN2 BUF-IN2 12 13 14 15 16 17 18 19 20 21 22 3435363738394041424344 TSH511 Audio buffers Standby RX1 RX2 SQUELCH GND SBY1 SBY2 VCC DEC-OUT GND MUTE-IN GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC AMP-IN1 DEC-LNA AMP-OUT2 GND LIM-IN2 DEC-LIM2B LIM-OUT2 DEC-LIM2A VCC MIX-OUT2 GND AMP-OUT1 GND LIM-IN1 DEC-LIM1 LIM-OUT1 DEC-LIM1B MIX-IN1 VCC MIX-OUT1 GND BUF-IN1 Vref LNA amp. limiter FM demodulator limiteramp. FM demodulator IR frequency applications
1.6 MHz AM mono
1.7 MHz FM mono
2.3 MHz FM right channel
2.8 MHz FM left channel or mono
The comparator and the CMUTE capacitor gener- ate the fade-in and fade-out control ramps for the audio buffers. The Squelch has been designed with particular attention to avoid audio pop-noise. Figure 6 : Squelch schematic The squelch section is driven by the receiver RX1 but controls both audio buffers. Audio Buffer sections The audio signal from a FM demodulator enters into the 6dB/octave low-pass filter for de-empha- sis. 50µs and 75µs are standard de-emphasis val- ues. After the de-emphasis network, the potentiometer controls the volume. The Rail-to-Rail output stage of each Audio Buffer is able to drive 20 mW into 16 Ω at 2.3V supply voltage. In this condition, the distortion is typically 0.3% before saturation. The Audio Buffers can also drive the other usual impedances used in audio: 32Ω , 600Ω and 10kΩ (see the corresponding distorsion curves). The high input impedances of the Audio Buffers reduce the coupling capacitors to less than 0.1 µF allowing space and cost saving. Standby section Depending on the states of the logic inputs SBY1 and SBY2, RX2 and the Audio Buffer2 can be disabled separately. The TSH511 receiver can adapt to different applications by using SBY1 & SBY2 standby pins: In the standard stereo mode, the configuration is: SBY1 = SBY2 = ’Low’ In mono mode with one load(example: a single loadspeaker), RX2 and Audio Buffer 2 are disabled, the configuration is SBY1 = SBY2 = ’High’. In mono mode with a stereo load (example: a stereo headphone), the configuration is SBY1 = ’high’, SBY2 = ’Low’. A pin connected to Vcc is at ’High’ state, and if connected to GND is at ’Low’ state. SBY1 pin 32 SBY2 pin 31 RX1 & audio buffer1 RX2 audio buffer 2 typical use Low Low ON ON ON stereo Low High High Low ON OFF ON mono on the two outputs High High ON OFF OFF mono on one out- put
The infrared carriers are detected by the photodiode and the signal is directly amplified by the TSH511. Optional reject filters can be added in each channel to improve crosstalk performances. Each receiver has a standard bandpass filter (filters F1 & F3) to select the 2.3 and 2.8 MHz carriers. After the FM demodulators, the potentiometers P1 and P2 control the volume levels. The stereo headphones are directly connected to the integrated audio buffers. The potentiometer P3 allows adjustment of the sensitivity of the Squelch. The Squelch function fade-in and fade-out the audio signal depending on the level of the 2.8 MHz carrier.
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44 PINS - PLASTIC PACKAGE
Dimensions Millimeters Inches A 1.60 0.063 A1 0.05 0.15 0.002 0.006 C 0.09 0.20 0.004 0.008 D 12.00 0.472 D1 10.00 0.394 D3 8.00 0.315 e 0.80 0.031 E 12.00 0.472 E1 10.00 0.394 E3 8.00 0.315 L1 1.00 0.039 K 0° (min.), 7° (max.) 44 34 e 12 22 c B A D EL K 0,25 mm .010 inch GAGE PLANE 0,10 mm .004 inch SEATING PLANE