TSH511_07 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 25
Technical content
Datasheet sections
- 1 Block diagram
- 2 Absolute maximum ratings
- 3 Electrical characteristics
- 4 Overall circuit performance
- 5 Audio buffer performance
- 6 Typical application sc hematics
- 7 Application information
- 7.1 Infrared stereo headphone application
- 7.2 Multimedia application
- 8 General description
- 8.1 LNA section: low noise amplifier
- 8.2 AMP and LIM sections: amplifier and limiter
- 8.3 FM demodulator section
- 8.4 Squelch section
- 8.5 Audio buffer sections
- 8.6 Standby section
- 9 Package information
- 10 Ordering information
- 11 Revision history
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: 4µV @12dB SINAD ■ Flexibility: access pins for each section ■ Receiver 2 Standby for mono operation
Applications
■ Infrared hi-fi stereo receiver ■ Infrared multimedia headsets ■ Stereo sub-carrier demodulator ■ FM IF receiver systems ■ Power line carrier intercoms
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. The TSH511 forms a chipset with the dual transmitter TSH512. 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 Pin connections (top view)
1 Block diagram
Figure 1. Block diagram Table 1. Pin descriptions
1 GND - - GROUND
2 AMP-IN2 RX2 I Intermediate amplifier input
3 VCC - - SUPPL Y VOLTAGE
4 LNA-OUT2 RX2 O Low Noise Amplifier output
5 VCC - - SUPPL Y 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 - - SUPPL Y 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 - - SUPPL Y 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 - - SUPPL Y 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 - - SUPPL Y 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 c onnect to supply or decoupling capacitors or external components.
2 Absolute maximum ratings
Table 2. Absolute maximum ratings
- All voltage values, except differential voltage, are with respect to network ground terminal.
- Electrostatic discharge pulse (ESD pulse) simulating a human body discharge of 100pF through 1.5kΩ.
- Discharge to ground of a device that has been previously charged.
- Electrostatic discharge pulse (ESD pulse) approximating a pulse of a machine or mechanical equipment.
- Corporate STMicroelectr onics procedure number 0018695.
Table 3. Operating conditions
3 Electrical characteristics
Table 4. V CC = 2.7V, Tamb = 25°C, faudio = 1kHz, fcarrier = 2.8MHz, frequency deviation = +/-75kHz
when audio buffers are muted. to OFF states of audio buffers. to ON states of audio buffers.
4 Overall circuit performance
bandpass characteristic. It approximates the response of human hearing. Figure 2. Supply current vs. supply voltage Figure 3. Squelch threshold vs. R MUTE input Figure 4. S/N vs. 2.8 MHz input level Figure 5. Supply current vs. temperature Figure 6. Sensitivity vs. supply voltage
5 Audio buffer performance
Figure 7. Output THD+N vs. output power Figure 8. Output THD+N vs. output power Figure 9. Output THD+N vs. output power Figure 10. Output THD+N vs. output power Figure 11. Output THD+N vs. output power Figure 12. Output THD+N vs. output power
Figure 19. Output power vs. temperature
6 Typical application schematics
Figure 20 shows a typical layout for the stereo infrared receiver. Figure 20. Stereo infrared receiver
7 Application information
This section provides application information for some typical applications.
7.1 Infrared stereo headphone application
SBY1 and SBY2 enable only one receiver for the mono applications. Figure 21. Hi-fi stereo headphone block diagram
2.3 MHz
2.8 MHz
Figure 22. Stereo headphone application diagram
7.2 Multimedia application
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.
Figure 23. Headset side block diagram reduce the supply current (see Figure 24). Figure 24. Computer side block diagram
1.7 MHz
8 General description
mono/stereo subcarrier receiver, power line carrier audio. Figure 25. TSH511 block diagram 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. second filter. The AMP sections have 20dB typical gain. demodulation in the FM demodulator. The FM demodulator is a classic quadrature detector that uses an external tank.
The demodulated signal can be amplified by the audio buffer section after de-emphasis. Each audio buffer can drive a 16Ω headphone with 20mW power. depending on the combination on SBY1 & SBY2.
8.1 LNA section: low noise amplifier
from the photo diode. The LNA is common to both receiver sections RX1 and RX2. Figure 26. LNA schematics Table 5. Infrared audio frequencies
1.6 AM mono
1.7 FM mono
2.3 FM right channel
2.8 FM left channel or mono
on each pin LNA-OUT1 or LNA-OUT2 must be 2kΩ minimum. thus improving noise performance.
8.2 AMP and LIM sections: amplifier and limiter
demodulator. It reduces the AM parasitic effects into the FM demodulator. Figure 27. AMP and LIM schematics
8.3 FM demodulator section
is tuned on the receiving frequency.
control and the de-emphasis filter. Figure 28. FM demodulator schematics
8.4 Squelch section
output and fades out the audio of both audio buffers.
Figure 29. Squelch schematics The squelch section is driven by the receiver RX1 but controls both audio buffers.
8.5 Audio buffer sections
emphasis. 50µs and 75µs are standard de-emphasis values. After the de-emphasis network, the potentiometer controls the volume. supply voltage. Under these conditions, the distortion is typically 0.3% before saturation. 10kΩ (see the corresponding distortion curves). 0.1µF allowing space and cost saving.
8.6 Standby section
In the standard stereo mode, the configuration is: SBY1 = SBY2 = Low. disabled, the configuration is SBY1 = SBY2 = High. A pin is in High state if connected to VCC, and is in Low state if connected to GND.
9 Package information
Table 6. Standby pin description
Figure 30. TQFP44 package mechanical data
Table 7. Order codes
- Qualification and characterizati on according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 & Q 002 or equivalent are on-going. 01-Aug-2001 1 First release corresponding to Preliminary Data version of datasheet. 5-Jul-2007 4 Value of Fcarrier reduced to 2.8MHz in LNA section in Table 4. 12-Nov-2007 5 Added PPAP reference in Table 7: Order codes.