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TSH511
Hi-fi stereo/mono infrared receiver and stereo sub-carrier demodulator
Features

Supply voltage: 2.3V to 5.5V Carriers frequency range: 0.4MHz to 11MHz Two FM receivers for stereo Integrated audio buffers Audio outputs: 20mW into 16 ohms High sensitivity: 4V @12dB SINAD Flexibility: access pins for each section Receiver 2 Standby for mono operation Pin connections (top view) F TQFP44 10 x 10 mm
Applications

Infrared hi-fi stereo receiver Infrared multimedia headsets Stereo sub-carrier demodulator
1 33 32 Standby 3 4 amp. limiter FM demodulator 31 30 29 44 43 42 41 40 39 38 37 36 35 34
FM IF receiver systems
2
Power line carrier intercoms
RX2
Description
The TSH511 is a 0.4 to 11MHz dual FM receiver. This circuit offers the functions needed for a highly sensitive infrared hi-fi stereo receiver. Featuring high input sensitivity and high input dynamic range, each receiver integrates an RF front-end LNA, an intermediate amplifier with 2 external filters, a voltage limiter, a quadrature FM demodulator, and finally an audio buffer. The integrated audio buffers are able to directly drive a 16-ohm 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 enables one receiver only, reducing the supply current.
5 6 7 8 9 10 11
LNA
TSH511
RX1
Audio buffers
28 27 26
Vref
amp.
limiter
FM demodulator SQUELCH
25 24 23
12
13
14
15
16
17
18
19
20
21
22
The TSH511 forms a chipset with the dual transmitter TSH512.
November 2007
Rev 5
1/25
www.st.com 25
Contents
TSH511
Contents
1 2 3 4 5 6 7 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Overall circuit performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Audio buffer performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1 7.2 Infrared stereo headphone application . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Multimedia application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Headset side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Computer side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1 8.2 8.3 8.4 8.5 8.6 LNA section: low noise amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 AMP and LIM sections: amplifier and limiter . . . . . . . . . . . . . . . . . . . . . . 19 FM demodulator section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Squelch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Audio buffer sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Standby section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9 10 11
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2/25
TSH511
Block diagram
1
Figure 1.
Block diagram
Block diagram
DEC-LIM2B DEC-LIM2A AMP-OUT2 LIM-OUT2 MIX-OUT2 MIX-IN2 BUF-IN2 34
LIM-IN2
GND
44
43
42
41
40
39
38
37
36
35
GND
VCC
GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC AMP-IN1 DEC-LNA
1 2 Standby 3 4 5 6 7 8 9 10 11 amp. amp. limiter FM demodulator
33 32 31 30 29
GND SBY1 SBY2 BUF-OUT2 VCC DEC-OUT GND BUF-OUT1 MUTE-OUT MUTE-INT MUTE-IN
RX2
LNA
TSH511
RX1
Audio buffers
28 27 26
Vref
limiter
FM demodulator SQUELCH
25 24 23
12 AMP-OUT1
13
14
15 DEC-LIM1
16 LIM-OUT1
17 DEC-LIM1B
18
19
20 MIX-OUT1
21
22
GND
Table 1.
Pin
1 2 3 4 5 6 7 8 9
Pin descriptions
Pin name
GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC
Related to
RX2 RX2 RX1 & RX2 RX1 -
Direction(1)
I O I O GROUND
GND
Intermediate amplifier input SUPPLY VOLTAGE Low Noise Amplifier output SUPPLY VOLTAGE Low Noise Amplifier input GROUND Low Noise Amplifier output SUPPLY VOLTAGE
BUF-IN1
LIM-IN1
MIX-IN1
VCC
Pin description
3/25
Block diagram Table 1.
Pin
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
TSH511
Pin descriptions
Pin name
AMP-IN1 DEC-LNA AMP-OUT1 GND LIM-IN1 DEC-LIM1A LIM-OUT1 DEC-LIM1B MIX-IN1 VCC MIX-OUT1 GND BUF-IN1 MUTE-IN MUTE-INT MUTE-OUT BUF-OUT1 GND DEC-OUT VCC BUF-OUT2 SBY2 SBY1 GND BUF-IN2 GND MIX-OUT2 VCC MIX-IN2 DEC-LIM2A LIM-OUT2 DEC-LIM2B LIM-IN2 GND AMP-OUT2
Related to
RX1 RX1 & RX2 RX1 RX1 RX1 RX1 RX1 RX1 RX1 RX1 RX1 & RX2 RX1 & RX2 RX1 & RX2 RX1 RX1 & RX2 RX2 RX1 & RX2 RX1 & RX2 RX2 RX2 RX2 RX2 RX2 RX2 RX2 RX2
Direction(1)
I O I O I O I I O O O I I I O I O I O
Pin description
Intermediate amplifier input Decoupling capacitor Intermediate amplifier input GROUND Limiter input Decoupling capacitor Limiter output Decoupling capacitor Mixer input SUPPLY VOLTAGE Mixer output (demodulated audio signal) GROUND Audio buffer input Noise amplifier input (Squelch circuit) Capacitor connection of the noise rectifier Capacitor connection (ramp generator to mute the audio) Audio buffer output GROUND Decoupling capacitor of Audio buffers SUPPLY VOLTAGE Audio buffer output Standby 2 Standby 1 GROUND Audio buffer input GROUND Mixer output SUPPLY VOLTAGE Mixer input Decoupling capacitor Limiter output Decoupling capacitor Limiter input GROUND Intermediate amplifier output
1. Pin direction: I = input pin, O = output pin, - = pin to connect to supply or decoupling capacitors or external components.
4/25
TSH511
Absolute maximum ratings
2
Table 2.
Symbol VCC Toper Tstg Tj Rthjc Rthja ESD except for pin 6
Absolute maximum ratings
Absolute maximum ratings
Parameter Supply voltage(1) Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to case Thermal resistance junction to ambient area HBM: human body model CDM: charged device model(3) MM: machine model(4)
(2)
Value 7 -40 to +85 -65 to +150 150 14 45 2 1.5 0.2 1 1 0.1 A
Unit V C C C C/W C/W kV
HBM: human body model ESD only for CDM: charged device model pin 6 MM: machine model Latch-up
1.
kV
Class(5)
All voltage values, except differential voltage, are with respect to network ground terminal.
2. Electrostatic discharge pulse (ESD pulse) simulating a human body discharge of 100pF through 1.5k. 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 STMicroelectronics procedure number 0018695.
Table 3.
Symbol VCC faudio fcarrier
Operating conditions
Parameter Supply voltage Audio frequency range Carrier frequency range Value 2.3 to 5.5 20 to 20,000 0.4 to 11 Unit V Hz MHz
5/25
Electrical characteristics
TSH511
3
Table 4.
Symbol
Electrical characteristics
VCC = 2.7V, Tamb = 25C, faudio = 1kHz, fcarrier = 2.8MHz, frequency deviation = +/-75kHz (unless otherwise specified)
Parameter Test conditions Min Typ Max Unit
Overall circuit (referring to typical application schematic, without reject filters) ICC_OX Current consumption RX1 is on, RX2 is on Current consumption RX1 is on, RX2 is off RX1 audio buffer is on RX2 audio buffer is on Current consumption RX1 is on, RX2 is off RX1 audio buffer is on RX2 audio buffer is off SBY1 = 'Low' SBY2 = X (X = position is irrelevant) SBY1 = 'High' SBY2 = 'Low' 15 18 mA
ICC_10
11
13
mA
ICC_11
SBY1 = 'High' SBY2 = 'High'
9.5
11.5
mA
MAUS
With audio SINAD=12dB, audio BW=30kHz Maximum usable average sensitivity With audio SINAD=26dB, audio BW=30kHz Output audio signal to noise ratio Vcarrier = 1mVRMS, with psophometric filter Output S/N reduced by 3dB, in BW = 30kHz Output S/N reduced by 3dB, psophometric filter Vcarrier = 1mVRMS, with psophometric filter
4 19 58
VRMS
SNOUT
dB
Vi
Input limiting voltage
80 60 0.6
VRMS
THD
Total harmonic distortion
%
Low noise amplifier (LNA) section GLNA BWLNA En_LNA In_LNA ZLNA_IN ZLNA_OUT P1dB_LNA IIP3LNA LNA voltage gain -3dB LNA bandwidth Equivalent input noise voltage Equivalent input noise current Input impedance defined as RLNA_IN in parallel with CLNA_IN Output impedance 1dB compression point Input 3rd order interception point ZL= 2k ZL= 2k, fcarrier= 2.8MHz ZL= 2k ZL= 2k, fcarrier= 2.8MHz ZL= 2k, fcarrier = 2.8MHz ZL = 2k Rs = 0 Rs = 0 RLNA_IN CLNA_IN 18 22 20 3.4 0.6 30 2 200 127 95 30 22 28 dB MHz nV/ Hz pA/ Hz k pF mVRMS mVRMS
Amplifier (AMP) section GAMP Amplifier voltage gain ZL=2k, fcarrier= 2.8MHz 16 20 dB
6/25
TSH511 Table 4.
Symbol ZAMP_IN ZAMP_OUT P1dBAMP BWAMP
Electrical characteristics VCC = 2.7V, Tamb = 25C, faudio = 1kHz, fcarrier = 2.8MHz, frequency deviation = +/-75kHz (unless otherwise specified) (continued)
Parameter Input impedance defined as RAMP_IN in parallel with CAMP_IN Output impedance 1dB compression point -3dB AMP bandwidth ZL = 2k ZL = 2k fcarrier= 2.8MHz ZL = 2k Test conditions RAMP_IN CAMP_IN Min Typ 10 2 350 560 mVRMS 250 11 MHz Max Unit k pF
Limiter (LIM) section GLIM ZLIM_IN VLIM_OUT Voltage gain Input impedance defined as RLIM_IN in parallel with CLIM_IN Output voltage ZL= 15k tied to GND RLIM_IN CLIM_IN ZL = 15k tied to GND 50 54 15 2 170 60 dB k pF mVpp
FM demodulator section VDEM Output voltage +-75kHz FM deviation typical application schematic, ZL = 4k 700 800 100 900 mVRMS
ZDEM_OUT Output impedance Squelch section ATT ZN_IN VN_TH VN_HYS Audio attenuation on each receiver when audio buffers are muted. Noise amplifier input impedance Comparator threshold Comparator hysteresis from muted to unmuted state , Rmute = 22k fIN = 100kHz Rmute = 22k, fIN = 100kHz RX1 and RX2 audio buffers muted, ZL = 16 on both audio buffers 55
65 2 9 1
dB k mVRMS mVRMS
Imute_sink
Current sinks on pin 25 to discharge Cmute capacitor: ramp generator Voltage on pin 25 = 1.7V controlling the attenuation from ON to OFF states of audio buffers.
24
A
Current sources on pin 25 to charge Cmute capacitor: ramp generator Imute_source Voltage on pin 25 = 1.7V controlling the attenuation from OFF to ON states of audio buffers. Audio buffers ZOD-IN BW1dB POUT_OD THDOD Input impedance -1dB bandwidth Output power Distortion in line driver mode ZL = 16 ZL= 16, VOD_IN=70mVRMS Vout = 0.5 VRMS, ZL= 10k 15
14
A
200 35 20 0.2 0.3
k kHz mW %
7/25
Electrical characteristics Table 4.
Symbol THDOD
TSH511
VCC = 2.7V, Tamb = 25C, faudio = 1kHz, fcarrier = 2.8MHz, frequency deviation = +/-75kHz (unless otherwise specified) (continued)
Parameter Distortion in power amplifier mode Test conditions With decoupling capacitor CDEC = 1F/ceramic on pin 28, Pout = 20 mW, ZL = 16 Min Typ 0.35 Max 0.8 Unit %
VISOL Standby VSTBY_L VSTBY_H TON TOFF
Crosstalk: isolation between the two Pout = 20 mW, ZL = 16 audio buffers
51
dB
Low level input voltage of Standby inputs (Pins 31 and 32) High level input voltage of Standby inputs (Pins 31 and 32) Turn-on time from Standby mode to Active mode Turn-off time from Active mode to Standby mode
0.9xVCC
0.1xVCC
V V
0.5 0.5
s s
8/25
TSH511
Overall circuit performance
4
Figure 2.
20 18 16 14 ICC(mA) 12 10 8 6 4 2 0 0
Overall circuit performance
Supply current vs. supply voltage Figure 3.
60
RX1+RX2+Buffers RX1+Buffers
Squelch threshold vs. RMUTE input resistor
50 40 30 20
VCC = 2.7V FIN = 100 kHz
RX1+ (RX1 Buffer)
VN_TH(mVRMS)
FIN = 1 MHz
10 0
1
2
3 VCC(V)
4
5
6
1
10 RMUTE(k)
100
Figure 4.
60 50 Total S/N (dB) 40 30
S/N vs. 2.8 MHz input level
PSOPH
BW = 30 kHz
20 10 0 1 10 100 Input Level (V) 1000
VCC = 2.7 V Deviation = +/-75 kHz
Note:
PSOPH: Signal on Noise Ratio curve measured with a CCITT standard psophometric bandpass characteristic. It approximates the response of human hearing. Supply current vs. temperature
VCC = 2.7V
Figure 5.
20 18 16 14 ICC(mA) 12 10 8 6 4 2 0 -40
Figure 6.
25 Sensitivity (V) @ 26 dB SINAD
Sensitivity vs. supply voltage
TX1+TX2 TX1+TX2+Buffers
20
15
TX1+Buffers TX1
10
FCARRIER = 2.8MHz FMOD = 1 kHz Deviation = +/- 75kHz BW = 30 kHz
5
-20
0
20 TAMB(C)
40
60
80
0
2
3
4 VCC(V)
5
9/25
Audio buffer performance
TSH511
5
Figure 7.
Audio buffer performance
Output THD+N vs. output power (RL = 16) Figure 8. Output THD+N vs. output power (RL = 16)
10
VCC = 2.3V
10
F = 20 kHz
THD+NBUFFER (%)
VCC = 5.5V
1
THD+NBUFFER (%)
VCC = 2.7V
1
F = 1 kHz
RL = 16 F = 1 kHz BW = 30 kHz
0.1
1
10 POUT-BUF(mW)
100
0.1
F = 20 Hz
RL = 16 VCC = 2.7 V
1
10 POUT-BUF(mW)
100
Figure 9.
10
Output THD+N vs. output power (RL = 32)
RL = 32 F = 1 kHz BW = 30 kHz VCC = 2.3V
Figure 10. Output THD+N vs. output power (RL = 32)
10
THD+NBUFFER (%)
THD+NBUFFER (%)
VCC = 2.7V
F = 20 kHz
1
1
F = 1 kHz F = 20 Hz
VCC = 5.5V
RL = 32 VCC = 2.7 V
0.1
1
10 POUT-BUF(mW)
100
0.1
1
10 POUT-BUF(mW)
100
Figure 11. Output THD+N vs. output power (RL = 600)
VCC = 2.3V
Figure 12. Output THD+N vs. output power (RL = 600)
10
1 THD+NBUFFER (%) THD+NBUFFER (%)
VCC = 2.7V VCC = 5.5V F = 20 kHz
1
F = 20 Hz F = 1 kHz RL = 600 VCC = 2.7 V
0.1
RL = 600 F = 1 kHz BW = 30 kHz
0.1 0.1 1 POUT-BUF(mW) 10 0.1 POUT-BUF(mW)
1
10/25
TSH511
Audio buffer performance
Figure 13. Output THD+N vs. output voltage (RL = 10k)
10
RL = 10 k F = 1 kHz BW = 30 kHz VCC = 2.3V
Figure 14. Output THD+N vs. output voltage (RL = 10k)
10
RL = 10 k VCC = 2.7 V
THD+NBUFFER (%)
1
VCC = 5.5V
THD+NBUFFER (%)
VCC = 2.7V
1
F = 20 Hz F = 1 kHz F = 20 kHz
0.1 0.1 VOUT-BUF(Vrms) 1
0.1 0.1 VOUT-BUF(Vrms) 1
Figure 15. Output THD+N vs. frequency (RL = 16)
10
VCC = 2.7 V Vin = 50 mVrms RL = 16
Figure 16. Output THD+N vs. frequency (RL = 32)
10
VCC = 2.7 V Vin = 50 mVrms RL = 32
THD+NBUFFER (%)
1
THD+NBUFFER (%) 100 1000 Frequency (Hz) 10000
1
0.1 20
0.1 20
100
1000 Frequency (Hz)
10000
Figure 17. Output THD+N vs. frequency (RL = 600)
10
VCC = 2.7 V Vin = 50 mVrms RL = 600
Figure 18. Output THD+N vs. frequency (RL = 10k)
10
VCC = 2.7 V Vin = 50 mVrms RL = 10 k
THD+NBUFFER (%)
1
THD+NBUFFER (%) 1000 Frequency (Hz) 10000
1
0.1 20
100
0.1 20
100
1000 Frequency (Hz)
10000
11/25
Audio buffer performance
TSH511
Figure 19. Output power vs. temperature
24 22 POUT-BUF(mW) 20 18 16 14 12 10 -40 -20 0 20 TAMB(C)
VCC = 2.7V RL = 16 VIN = 70 mVRMS
40
60
80
12/25
TSH511
Typical application schematics
6
Typical application schematics
Figure 20 shows a typical layout for the stereo infrared receiver.
Figure 20. Stereo infrared receiver
13/25
Application information
TSH511
7
Application information
This section provides application information for some typical applications.
7.1
Infrared stereo headphone application
The right side of Figure 21 shows the block diagram of an infrared stereo receiver using the TSH511. The sensitive LNA, directly connected to the photo diode, does not require an external pre-amplifier. After filtering, the amplified signals are limited and demodulated with quadrature demodulators. The two integrated audio buffers directly drive the stereo headphones. The audio power reaches 2x20mW in two 16 loads. The built-in squelch function fades out the audio when the incoming infrared signal is low. The standby inputs SBY1 and SBY2 enable only one receiver for the mono applications.
Figure 21. Hi-fi stereo headphone block diagram
IR stereo HiFi transmitter (Television)
IR stereo HiFi receiver (Headphones)
Vcc: 2.3 to 5.5V Current < 15 mA
2.3 MHz
TSH512
Right channel
LNA + ALC
filter
TSH511
Audio buffer2
buffer2
TX2
Vcc SBY
photodiode
Line inputs VOX
Left channel buffer1
LNA
TX1
LNA + ALC
rs rrie o: z ca eH ter i s .8 M HiF & 2 2.3
LED
SQUELCH
RX2
20 mW / 16
RX1
SBY2
20 mW / 16
Audio buffer1
filter
Power supply: 2.3 to 5.5V Icc < 20 mA stereo
2.8 MHz
The infrared carriers are detected by the photo diode and the signal is directly amplified by the TSH511. Each receiver has a standard bandpass filter (filters F1 & F2) to select the 2.3MHz and 2.8MHz carriers. After the FM demodulators, the potentiometer P1 controls the volume levels. The stereo headphones are directly connected to the integrated audio buffers. The potentiometer P2 allows adjustment of the sensitivity of the Squelch. The Squelch function fades in and fades out the audio signal, depending on the level of the 2.8MHz carrier.
14/25
SBY1
TSH511 Figure 22. Stereo headphone application diagram
Application information
7.2
Multimedia application
Headset side
As shown in Figure 23, the TSH511 receives the hi-fi stereo sound from the computer through 2.3MHz and 2.8MHz stereo infrared carriers. The access pins to the RF amplifiers allow the use of a 1.7MHz reject filter to cancel the transmitted signal of the microphone. The wide supply range (2.3V to 5.5V) allows battery operation.
15/25
Application information Figure 23. Headset side block diagram
TSH511
TSH511 & 512 supply: 2.3 to 5.5V, 25 mA
HiFi stereo from the PC: 2x 20 mW /16
1.7 MHz reject filter
2.3 MHz Band-pass filter
TSH511
Voice transmitted to the PC Audio buffer2 SQUELCH
RX2
LNA
photodiode
TSH512
LNA + ALC
buffer2
SBY2
Vcc SBY MIC. BIAS Vcc
Audio buffer1
VOX
MIC. BIAS LED
SBY1 filter 1.7 MHz reject
TX2
RX1
filter 2.8 MHz Band-pass
buffer1
TX1
LNA + ALC 1.7 MHz filter Band-pass
Stereo Rx: 2.3 & 2.8 MHz
Microphone Tx: 1.7 MHz carrier
Computer side
In multimedia applications, the TSH511 receives the voice of the user through the 1.7MHz infrared carrier. The standby pins can disable the unused receiver and audio amplifier to reduce the supply current (see Figure 24). Figure 24. Computer side block diagram
TSH511 & 512 supply: 2.3 to 5.5V, 24 mA
HiFi stereo
Voice from the headset microphone
mono Rx: 1.7 MHz TSH511
photodiode
Audio buffer2
LNA
TSH512
LNA + ALC
buffer2
TX2
RX1
SBY1 SBY2 Vcc
SQUELCH Audio buffer1
HiFi stereo Tx: 2.3 & 2.8 MHz
RX2
SBY LED
VOX
filter LNA + ALC 1.7 MHz Band-pass
buffer1
TX1
16/25
TSH511
General description
8
General description
The TSH511 is a 0.4MHz to 11MHz dual FM analog receiver. The incoming signal is amplified with a 22dB low noise amplifier (LNA) section. The good noise performance of the LNA allows the photo diode for infrared applications to be connected directly to the TSH511 without any external preamplifier. The access pins for each section and the two standby configurations offer high versatility for many applications: hi-fi stereo infrared receiver, mono/stereo subcarrier receiver, power line carrier audio. Figure 25. TSH511 block diagram
DEC-LIM2B DEC-LIM2A AMP-OUT2 LIM-OUT2 MIX-OUT2
LIM-IN2
MIX-IN2
GND
44
43
42
41
40
39
38
37
36
35
GND
VCC
34
BUF-IN2
GND AMP-IN2 VCC LNA-OUT2 VCC LNA-IN GND LNA-OUT1 VCC AMP-IN1 DEC-LNA
1 2 Standby 3 4 5 6 7 8 9 10 11 amp. amp. limiter FM demodulator
33 32 31 30 29
GND SBY1 SBY2 BUF-OUT2 VCC DEC-OUT GND BUF-OUT1 MUTE-OUT MUTE-INT MUTE-IN
RX2
LNA
TSH511
RX1
Audio buffers
28 27 26
Vref
limiter
FM demodulator SQUELCH
25 24 23
12 AMP-OUT1
13
14
15 DEC-LIM1
16 LIM-OUT1
17 DEC-LIM1B
18
19
20 MIX-OUT1
21
22
The LNA is common to both receivers but the output 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 intermediate amplifier (AMP) section followed by a second filter. The AMP sections have 20dB typical gain. Finally, the signal is amplified and limited in the limiter (LIM) section. The 60dB amplifierlimiter LIM provides a constant amplitude signal to the demodulator. It reduces AM parasitic demodulation in the FM demodulator. The FM demodulator is a classic quadrature detector that uses an external tank.
GND
GND
BUF-IN1
LIM-IN1
MIX-IN1
VCC
17/25
General description
TSH511
The demodulated signal can be amplified by the audio buffer section after de-emphasis. Each audio buffer can drive a 16 headphone with 20mW power. The two standby pins SBY1 & SBY2 allow the second receiver RX2 to be put into standby for mono operation. In mono mode, 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 section mutes the audio buffers when no carrier is received. The squelch section uses the demodulated signal of the first receiver (RX1). This signal is high-pass 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 both audio buffers. When the carrier is present, the wideband noise on the demodulator output decreases, enabling the audio buffer. Table 5. Infrared audio frequencies
IR frequency in MHz 1.6 1.7 2.3 2.8 Applications AM mono FM mono FM right channel FM left channel or mono
8.1
LNA section: low noise amplifier
The low noise amplifier (LNA) has a typical gain of 22dB to amplify the incoming RF signal from the photo diode. The LNA is common to both receiver sections RX1 and RX2. Figure 26. LNA schematics
18/25
TSH511
General description The LNA output is directly connected to LNA-OUT1 and LNA-OUT2 pins in parallel (pin 8 and 4 respectively). Because the LNA minimum impedance load is 1k, the load impedance on each pin LNA-OUT1 or LNA-OUT2 must be 2k minimum. The series 50 resistor and the 100nF capacitor decouple the LNA supply voltage (pin 5), thus improving noise performance.
8.2
AMP and LIM sections: amplifier and limiter
The first filter output is connected to the intermediate amplifier AMP. The gain of AMP is typically 20dB. The second filter is connected between the output of AMP and the input of the limiter LIM. The 60dB limiter LIM provides a constant amplitude signal to the FM demodulator. It reduces the AM parasitic effects into the FM demodulator. Figure 27. AMP and LIM schematics
8.3
FM demodulator section
The FM demodulator is a classic quadrature demodulator based on a multiplier. The quadrature is performed with the tank circuit Llo inductor and Clo capacitor. The tank circuit is tuned on the receiving frequency. The Rlo resistor is connected in parallel with Llo and Clo to reduce the Q factor of the tank circuit. It allows to adjust the demodulation characteristics. For a given transmitting deviation, a lower value of Rlo gives a lower demodulated amplitude and reduces the distortion. The AC amplitude on pin 18 must not exceed 300mVRMS to prevent clipping by the internal ESD diodes of the circuit.
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General description
TSH511
The low output impedance of the demodulator (MIX-OUT pins) drives the external volume control and the de-emphasis filter. Figure 28. FM demodulator schematics
8.4
Squelch section
To avoid audio FM noise at the speakers when no carrier is received, the TSH511 has a built-in squelch circuit. The squelch detects the wideband FM noise on the demodulated output and fades out the audio of both audio buffers. The audio is filtered from the FM noise using the high-pass RC filter. The cut-off frequency is typically 100kHz. The squelch level depends on the value of the RMUTE resistor in series with the input pin of the noise amplifier MUTE-IN (pin 23). The detected noise is integrated with the Cpeak capacitor connected to MUTE-INT pin. The DC voltage on this pin follows the amplitude of the noise. The comparator and the CMUTE capacitor generate the fade-in and fade-out control ramps for the audio buffers. The squelch was designed with particular attention to avoid audio popnoise.
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TSH511 Figure 29. Squelch schematics
General description
The squelch section is driven by the receiver RX1 but controls both audio buffers.
8.5
Audio buffer sections
The audio signal from an FM demodulator enters into the 6dB/octave low-pass filter for deemphasis. 50s and 75s are standard de-emphasis values. After the de-emphasis network, the potentiometer controls the volume. The rail-to-rail output stage of each audio buffer is able to drive 20mW into 16 at 2.3V supply voltage. Under these conditions, the distortion is typically 0.3% before saturation. The audio buffers can also drive the other usual impedances used in audio: 32, 600 and 10k (see the corresponding distortion curves). The high input impedances of the audio buffers reduce the coupling capacitors to less than 0.1F allowing space and cost saving.
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Package information
TSH511
8.6
Standby section
Depending on the state of the logic inputs SBY1 and SBY2, RX2 and the Audio Buffer 2 can be disabled separately. The TSH511 receiver can adapt to different applications by using the SBY1 & SBY2 standby pins. Table 6.
SBY1 pin 32 Low Low High High
Standby pin description
SBY2 pin 31 Low ON High Low High ON ON OFF OFF ON OFF mono on the two outputs mono on one output ON ON stereo RX1 & audio buffer1 RX2 Audio buffer 2 Typical use
In the standard stereo mode, the configuration is: SBY1 = SBY2 = Low. In mono mode with one load (example: a single load speaker), RX2 and Audio Buffer 2 are disabled, the configuration is SBY1 = SBY2 = High. In mono mode with a stereo load (for example: a stereo headphone), the configuration is SBY1 = High, SBY2 = Low. A pin is in High state if connected to VCC, and is in Low state if connected to GND.
9
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com.
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TSH511 Figure 30. TQFP44 package mechanical data
Dimensions Ref. Min. A A1 A2 B C D D1 D3 E E1 E3 e L L1 K 0 0.45 11.80 9.80 0.05 1.35 0.30 0.09 11.80 9.80 12 10.00 8.00 12.00 10.00 8.00 0.80 0.60 1.00 3.5 7 0 0.75 0.018 12.20 10.20 0.465 0.386 1.40 0.37 Millimeters Typ. Max. 1.6 0.15 1.45 0.45 0.20 12.20 10.20 0.002 0.053 0.012 0.004 0.465 0.386 Min.
Package information
Inches Typ. Max. 0.063 0.006 0.055 0.015 0.057 0.018 0.008 0.472 0.394 0.315 0.472 0.394 0.315 0.031 0.024 0.039 3.5 7 0.030 0.480 0.402 0.480 0.402
0076922/D
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Ordering information
TSH511
10
Ordering information
Table 7. Order codes
Temperature range Package Packaging Tray TQFP44 TSH511CFT TSH511CYFT(1) -40C to +85C TQFP44 (Automotive grade) Tape & reel Tape & reel TSH511CYF TSH511C Marking
Part number TSH511CF
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent are on-going.
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Revision history
Date 01-Aug-2001 Revision 1 Changes First release corresponding to Preliminary Data version of datasheet. Datasheet updated for Maturity 30: - Electrical parameters updated - Application diagrams updated - Releases on curves Rthja value added on Table 2 on page 5 Value of Fcarrier reduced to 2.8MHz in LNA section in Table 4. Format update. Added PPAP reference in Table 7: Order codes.
01-Dec-2003
2
01-April-2005 5-Jul-2007 12-Nov-2007
3 4 5
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TSH511
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