ST TSH511 User Manual

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

TSH511

Hi-fi stereo/mono infrared receiver

and stereo sub-carrier demodulator

F

TQFP44

10 x 10 mm

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.

Pin connections

(top view)

36

36

Audio

Audio
buffers

buffers

Vref

Vref

Standby

Standby

SQUELCH

SQUELCH

3435

3435

39

39

FM demodulator

FM demodulator

FM demodulator

FM demodulator

3738

3738

40

40

41

44

44

1

1

2

2

3

3

4

4

5

5

LNA

LNA

6

6

7

7

8

8

9

9

amp.

amp.

10

10

11

11

12

12

41

4243

4243

limiteramp.

limiteramp.

RX2

RX2

TSH511

TSH511

RX1

RX1

limiter

limiter

13 14 15 16 17 18 19 20 21 22

13 14 15 16 17 18 19 20 21 22

The TSH511 forms a chipset with the dual
transmitter TSH512.

33

33

32

32

31

31

30

30

29

29

28

28

27

27

26

26

25

25

24

24

23

23

For mono applications, the standby pin enables
one receiver only, reducing the supply current.

November 2007 Rev 5 1/25

www.st.com

25

Contents TSH511

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Overall circuit performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Audio buffer performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.1 Infrared stereo headphone application . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.2 Multimedia application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Headset side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Computer side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8.1 LNA section: low noise amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.2 AMP and LIM sections: amplifier and limiter . . . . . . . . . . . . . . . . . . . . . . 19

8.3 FM demodulator section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8.4 Squelch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

8.5 Audio buffer sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

8.6 Standby section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

10 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2/25

TSH511 Block diagram

1 Block diagram

Figure 1. Block diagram

BUF-IN2

BUF-IN2

GND

GND

3435

3435

GND

GND

33

33

GND

GND

MIX-IN2

GND

GND

LIM-IN2

4243

4243

LIM-OUT2

LIM-OUT2

40

40

41

41

AMP-OUT2

AMP-OUT2

44

44

1

1

DEC-LIM2B

DEC-LIM2B

LIM-IN2

MIX-IN2

VCC

VCC

MIX-OUT2

DEC-LIM2A

DEC-LIM2A

39

39

MIX-OUT2

36

36

3738

3738

2

AMP-IN2

AMP-IN2

VCC

VCC

LNA-OUT2

LNA-OUT2

VCC

VCC

LNA-IN

LNA-IN

GND

GND

LNA-OUT1

LNA-OUT1

VCC

VCC

AMP-IN1

AMP-IN1

DEC-LNA

DEC-LNA

Table 1. Pin descriptions

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

LNA

LNA

amp.

amp.

12

12

13 14 15 16 17 18 19 20 21 22

13 14 15 16 17 18 19 20 21 22

AMP-OUT1

AMP-OUT1

limiteramp.

limiteramp.

RX2

RX2

TSH511

TSH511

RX1

RX1

limiter

limiter

LIM-IN1

LIM-IN1

DEC-LIM1

LIM-OUT1

DEC-LIM1

GND

GND

LIM-OUT1

Pin Pin name Related to Direction

FM demodulator

FM demodulator

FM demodulator

FM demodulator

MIX-IN1

MIX-IN1

DEC-LIM1B

DEC-LIM1B

(1)

VCC

VCC

Audio

Audio
buffers

buffers

Vref

Vref

MIX-OUT1

MIX-OUT1

Standby

Standby

SQUELCH

SQUELCH

GND

GND

32

32

SBY1

SBY1

31

31

SBY2

SBY2

30

30

BUF-OUT2

BUF-OUT2

29

29

VCC

VCC

28

28

DEC-OUT

DEC-OUT

27

27

GND

GND

26

26

BUF-OUT1

BUF-OUT1

25

25

MUTE-OUT

MUTE-OUT

24

24

MUTE-INT

MUTE-INT

23

23

MUTE-IN

MUTE-IN

BUF-IN1

BUF-IN1

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

3/25

Block diagram TSH511

Table 1. Pin descriptions

Pin Pin name Related to Direction

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-OUT 1 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-OUT 2 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

1. Pin direction: I = input pin, O = output pin, - = pin to connect to supply or decoupling capacitors or external components.

(1)

Pin description

4/25

TSH511 Absolute maximum ratings

2 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

T

oper

T

stg

T

R

thjc

R

thja

ESD

except

for pin 6

ESD only for

pin 6

Latch-up Class

1. 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 1.5kΩ.

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 STMicroelectronics procedure number 0018695.

Table 3. Operating conditions

Supply voltage
Operating free air temperature range -40 to +85 °C
Storage temperature -65 to +150 °C
Maximum junction temperature 150 °C

j

Thermal resistance junction to case 14 °C/W
Thermal resistance junction to ambient area 45 °C/W
HBM: human body model

CDM: charged device model
MM: machine model

HBM: human body model
CDM: charged device model
MM: machine model

(5)

(1)

(4)

(2)

(3)

7V

2

1.5

0.2
1

1

0.1
A

kV

kV

Symbol Parameter Value Unit

V

CC

f

audio

f

carrier

Supply voltage 2.3 to 5.5 V
Audio frequency range 20 to 20,000 Hz
Carrier frequency range 0.4 to 11 MHz

5/25

Electrical characteristics TSH511

3 Electrical characteristics

Table 4. VCC = 2.7V, T

= 25°C, f

amb

audio

= 1kHz, f

= 2.8MHz, frequency dev iation = +/-75k Hz

carrier

(unless otherwise specified)

Symbol Parameter Test conditions Min Typ Max Unit

Overall circuit (referring to typical application schematic, without reject filters)

I

CC_OX

Current consumption
RX1 is on, RX2 is on

Current consumption

I

CC_10

RX1 is on, RX2 is off
RX1 audio buffer is on
RX2 audio buffer is on

Current consumption

I

CC_11

RX1 is on, RX2 is off
RX1 audio buffer is on
RX2 audio buffer is off

MAUS Maximum usable average sensitivity

SN

OUT

V

Output audio signal to noise ratio

Input limiting voltage

i

SBY1 = ’Low’
SBY2 = X
(X = position is irrelevant)

SBY1 = ’High’
SBY2 = ’Low’

SBY1 = ’High’
SBY2 = ’High’

With audio SINAD=12dB,
audio BW=30kHz
With audio SINAD=26dB

,

audio BW=30kHz
V

carrier

= 1mV

RMS

, with

psophometric filter
Output S/N reduced by 3dB,

in BW = 30kHz
Output S/N reduced by 3dB,
psophometric filter

15 18 mA

11 13 mA

9.5 11.5 mA

4
19

58 dB

80
60

µV

µV

RMS

RMS

V

THD Total harmonic distortion

carrier

psophometric filter

Low noise amplifier (LNA) section

G

LNA

BW
E

n_LNA

I

n_LNA

Z

LNA_IN

Z

LNA_OUT

P

1dB_LNA

IIP3

LNA voltage gain ZL= 2kΩ, f

-3dB LNA bandwidth ZL = 2kΩ 20 MHz

LNA

Equivalent input noise voltage Rs = 0Ω 3.4 nV/√ Hz
Equivalent input noise current Rs = 0Ω 0.6 pA/√ Hz
Input impedance defined as

R

in parallel with C

LNA_IN

LNA_IN

R

LNA_IN

C

LNA_IN

Output impedance 200 Ω

Z

= 2kΩ

1dB compression point

Input 3rd order interception poi nt

LNA

L

ZL= 2kΩ, f

= 2kΩ

Z

L

= 2kΩ, f

Z

L

Amplifier (AMP) section

G

AMP

Amplifier voltage gain ZL=2kΩ, f

6/25

= 1mV

carrier

carrier

carrier

carrier

, with

RMS

0.6 %

= 2.8MHz 18 22 28 dB

30

2

= 2.8MHz

= 2.8MHz

127

95
30

22

mV

mV

= 2.8MHz 16 20 dB

kΩ
pF

RMS

RMS

TSH511 Electrical characteristics

Table 4. VCC = 2.7V, T

= 25°C, f

amb

audio

= 1kHz, f

= 2.8MHz, frequency dev iation = +/-75k Hz

carrier

(unless otherwise specified) (continued)

Symbol Parameter Test conditions Min Typ Max Unit

Z

AMP_IN

Z

AMP_OUT

P

1dBAMP

BW

AMP

Input impedance defined as

AMP_IN

in parallel with C

R
Output impedance 350 Ω

1dB compression point

-3dB AMP bandwidth ZL = 2kΩ 11 MHz

Limiter (LIM) section

G

LIM

Z

LIM_IN

V

LIM_OUT

Voltage gain ZL= 15kΩ tied to GND 50 54 60 dB
Input impedance defined as

R

in parallel with C

LIM_IN

Output voltage ZL = 15kΩ tied to GND 170 mV

FM demodulator section

V

DEM

Z

DEM_OUT

Output voltage

Output impedance 100 Ω

Squelch section

AMP_IN

LIM_IN

R

AMP_IN

C

AMP_IN

Z

= 2kΩ

L

= 2kΩ

Z

L

f

= 2.8MHz

carrier

R

LIM_IN

C

LIM_IN

+-75kHz FM deviation
typical application
schematic, ZL = 4kΩ

10

2

560
250

15

2

700 800 900 mV

mV

kΩ
pF

RMS

kΩ
pF

pp

RMS

ATT

Z

N_IN

V

N_TH

V

N_HYS

I

mute_sink

I

mute_source

Audio buffers

Z

OD-IN

BW

1dB

P

OUT_OD

THD

OD

Audio attenuation on each receiver
when audio buffers are muted.

RX1 and RX2 audio buffers
muted, Z

= 16Ω on both

L

audio buffers

55 65 dB

Noise amplifier input impedance 2 kΩ

from muted to unmuted

Comparator threshold

Comparator hysteres is R

state

= 22kΩ, fIN = 100kHz

R

mute

= 22kΩ, fIN = 100kHz 1 mV

mute

9mV

RMS

RMS

Current sinks on pin 25 to discharge

capacitor: ramp generator

C

mute

controlling the attenuation from ON

V oltage on pin 25 = 1.7V 24 µA
to OFF states of audio buffers.
Current sources on pin 25 to charge

C

capacitor: ramp generator

mute

controlling the attenuation from OFF

V oltage on pin 25 = 1.7V 14 µA
to ON states of audio buffers.

Input impedance 200 kΩ

-1dB bandwidth ZL = 16Ω 35 kHz
Output power ZL= 16Ω, V
Distortion in line driver mode V

= 0.5 V

out

=70mV

OD_IN
RMS, ZL

RMS

= 10kΩ 0.2 0.3 %

15 20 mW

7/25

Electrical characteristics TSH511

Table 4. VCC = 2.7V, T

= 25°C, f

amb

audio

= 1kHz, f

= 2.8MHz, frequency dev iation = +/-75k Hz

carrier

(unless otherwise specified) (continued)

Symbol Parameter Test conditions Min Typ Max Unit

With decoupling capacitor

THD

V

ISOL

Standby

V

STBY_L

V

STBY_H

T

ON

T

OFF

Distortion in power amplifier mode

OD

Crosstalk: isolation between the two
audio buffers

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

CDEC = 1µF/ceramic on pin

28, P

P

= 20 mW, ZL = 16Ω

out

= 20 mW, ZL = 16Ω 51 dB

out

0.9xV

0.35 0.8 %

0.1xV

CC

0.5 µs

0.5 µs

CC

V

V

8/25

TSH511 Overall circuit performance

4 Overall circuit performance

Figure 2. Supply current vs. supply voltage Figure 3. Squelch threshold vs. R

resistor

20
18
16

RX1+RX2+Buffers

RX1+Buffers

14
12
10

(mA)

CC

I

8
6

RX1+ (RX1 Buffer)

4
2
0

0123456

VCC(V)

60

VCC = 2.7V

50

40

)

RMS

(mV

30

N_TH

V

20

FIN = 1 MHz

FIN = 100 kHz

10

0

110100

R

(kΩ)

MUTE

Figure 4. S/N vs. 2.8 MHz input level

60

50

40

30

Total S/N (dB)

20

PSOPH

BW = 30 kHz

MUTE

input

10

0

1 10 100 1000

VCC = 2.7 V
Deviation = +/-75 kHz

Input Level (μV)

Note: PSOPH: Signal on Noise Ratio curve measured with a CCITT standard psophometric

bandpass characteristic. It approximates the response of human hearing.

Figure 5. Supply current vs. temperature Figure 6. Sensitivity vs. supply voltage

20

VCC = 2.7V

18
16
14

TX1+TX2+Buffers

TX1+TX2

12
10

(mA)

CC

I

8

TX1+Buffers

6
4

TX1

2
0

-40-200 20406080

T

(°C)

AMB

25

20

15

10

F

= 2.8MHz

5

Sensitivity (µV) @ 26 dB SINAD

0

2345

CARRIER

F

= 1 kHz

MOD

Deviation = +/- 75kHz
BW = 30 kHz

VCC(V)

9/25

Audio buffer performance TSH511

5 Audio buffer performance

Figure 7. Output THD+N vs. output power

(R

= 16Ω)

L

10

VCC = 2.3V

(%)

BUFFER

1

THD+N

0.1
1 10 100

VCC = 2.7V

VCC = 5.5V

P

OUT-BUF

RL = 16 Ω
F = 1 kHz
BW = 30 kHz

(mW)

Figure 9. Output THD+N vs. output power

(R

= 32Ω)

L

10

(%)

BUFFER

THD+N

1

0.1

RL = 32 Ω
F = 1 kHz
BW = 30 kHz

110100

VCC = 2.3V

VCC = 2.7V

P

OUT-BUF

VCC = 5.5V

(mW)

Figure 11. Output THD+N vs. output power

(R

= 600Ω)

L

VCC = 2.3V

1

(%)

BUFFER

VCC = 2.7V

VCC = 5.5V

Figure 8. Output THD+N vs. output power

(RL = 16Ω)

10

F = 20 kHz

(%)

BUFFER

1

THD+N

0.1

F = 1 kHz

RL = 16 Ω

F = 20 Hz

110100

P

(mW)

OUT-BUF

VCC = 2.7 V

Figure 10. Output THD+N vs. output power

(RL= 32Ω)

10

F = 20 kHz

(%)

BUFFER

1

0.1

F = 1 kHz

F = 20 Hz

RL = 32 Ω
VCC = 2.7 V

110100

P

(mW)

OUT-BUF

THD+N

Figure 12. Output THD+N vs. output power

(RL= 600Ω)

10

F = 20 kHz

(%)

BUFFER

1

THD+N

0.1

0.1 1 10

P

(mW)

OUT-BUF

RL = 600 Ω
F = 1 kHz
BW = 30 kHz

10/25

0.1

F = 20 Hz

F = 1 kHz

0.1 1

P

(mW)

OUT-BUF

RL = 600 Ω
VCC = 2.7 V

THD+N

TSH511 Audio buffer performance

Figure 13. Output THD+N vs. output voltage

(R

= 10kΩ)

L

10

RL = 10 kΩ
F = 1 kHz
BW = 30 kHz

(%)

1

BUFFER

THD+N

0.1

0.1 1

VCC = 2.3V

VCC = 2.7V

VCC = 5.5V

V

OUT-BUF(Vrms

)

Figure 15. Output THD+N vs. frequency

(R

= 16Ω)

L

10

VCC = 2.7 V
Vin = 50 mV
RL = 16 Ω

(%)

BUFFER

1

rms

Figure 14. Output THD+N vs. output voltage

(RL = 10kΩ)

10

RL = 10 kΩ
VCC = 2.7 V

(%)

1

BUFFER

F = 20 Hz

THD+N

0.1

0.1 1

F = 1 kHz

V

OUT-BUF(Vrms

F = 20 kHz

)

Figure 16. Output THD+N vs. frequency

(RL = 32Ω)

10

VCC = 2.7 V
Vin = 50 mV
RL = 32 Ω

(%)

BUFFER

1

rms

THD+N

0.1

20

100 1000 10000

Frequency (Hz)

Figure 17. Output THD+N vs. frequency

(R

= 600Ω)

L

10

VCC = 2.7 V
Vin = 50 mV
RL = 600 Ω

(%)

BUFFER

1

THD+N

0.1

20

rms

100 1000 10000

Frequency (Hz)

THD+N

0.1

20

100 1000 10000

Frequency (Hz)

Figure 18. Output THD+N vs. frequency

(RL = 10kΩ)

10

VCC = 2.7 V
Vin = 50 mV
RL = 10 kΩ

(%)

BUFFER

1

THD+N

0.1

20

rms

100 1000 10000

Frequency (Hz)

11/25

Audio buffer performance TSH511

Figure 19. Output power vs. temperature

24
22

20

(mW)

18

OUT-BUF

16

P

14

12
10

-40-200 20406080

T

AMB

(°C)

VCC = 2.7V
RL = 16 Ω
VIN = 70 mV

RMS

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 infr a re d stere o rece iver 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 buf fers directly drive the stereo
headphones. The audio power reaches 2x20mW in two 16
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

Ω loads. The built-in squelch

Right

Right

channel

channel

Line inputs

Line inputs

Left

Left

channel

channel

LNA + ALC

LNA + ALC

LNA + ALC

LNA + ALC

Power supply:

Power supply:

2.3 to 5.5V

2.3 to 5.5V

Icc < 20mA stereo

Icc < 20mA stereo

IR stereo HiFi transmitter

IR stereo HiFi transmitter

(Television)

(Television)

TSH512 TSH511

TSH512 TSH511

buffer2

TX2

TX2

VOX

VOX

TX1

TX1

buffer2

buffer1

buffer1

SBY

SBY

Vcc

Vcc

LED

LED

H

H

i

i

F

F

i

i

3

3

.

.

2

2

photodiode

photodiode

:

:

o

o

z

z

e

e

r

r

H

H

e

e

t

t

M

M

s

s

8

8

.

.

2

2

&

&

IR stereo HiFi receiver

IR stereo HiFi receiver

(Headphones)

(Headphones)

LNA

LNA

s

s

r

r

e

e

i

i

r

r

r

r

a

a

c

c

2.3 MHz

2.3 MHz

filter

filter

RX2

RX2

RX1

RX1

filter

filter

2.8 MHz

2.8 MHz

Vcc: 2.3 to 5.5V

Vcc: 2.3 to 5.5V

Current < 15 mA

Current < 15 mA

Audio

Audio

buffer2

buffer2

SQUELCH

SQUELCHSQUELCH

SBY2

SBY2

SBY1

SBY1

buffer1

buffer1

Audio

Audio

20 mW / 16 Ω

20 mW / 16 Ω

20 mW / 16 Ω

20 mW / 16 Ω

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 dem odulators , th e potent iometer P1 co ntrols 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

TSH511 Application information

Figure 22. Stereo headphone application diagram

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 bat tery operation.

15/25

Application information TSH511

Figure 23. Headset side block diagram

TSH511 & 512 supply:

TSH511 & 512 supply:

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

2.3 to 5.5V, 25 mA

2.3 to 5.5V, 25 mA

Voicetransmittedto thePC

Voicetransmittedto thePC

Voicetransmittedto thePC

TSH512

TSH512

TSH512

LNA + ALC

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

LNA + ALC

LNA + ALC

LNA + ALC

TX2

TX2

TX2

VOX

VOX

VOX

TX1

TX1

TX1

1.7 MHz

1.7 MHz

1.7 MHz

Band-pass

Band-pass

Band-pass

filter

filter

filter

buffer2

buffer2

buffer2

buffer1

buffer1

buffer1

SBY

SBY

SBY

HiFi stereo from thePC:

HiFi stereo from the PC:

HiFi stereo from the PC:

2x 20 mW /16 Ω

2x 20 mW /16 Ω

2x 20 mW /16 Ω

Vcc

Vcc

Vcc

Vcc

Vcc

Vcc

LED

LED

LED

TSH511

TSH511

TSH511

Audio

Audio

Audio

buffer2

buffer2

buffer2

Audio

Audio

Audio

buffer1

buffer1

buffer1

1.7 MHz

1.7 MHz

1.7 MHz
reject

reject

reject

filter

filter

filter

RX2

RX2

RX2

SQUELCH

SQUELCH

SQUELCH

RX1

RX1

RX1

SBY1

SBY2

SBY1

SBY2

SBY1

SBY2

filter

filter

filter

1.7 MHz

1.7 MHz

1.7 MHz
reject

reject

reject

Microphone Tx:

Microphone Tx:

Microphone Tx:

1.7 MHz

1.7 MHz

1.7 MHz
carrier

carrier

carrier

2.3 MHz

2.3 MHz

2.3 MHz

Band-pass

Band-pass

Band-pass

filter

filter

filter

filter

filter

filter

2.8 MHz

2.8 MHz

2.8 MHz

Band-pass

Band-pass

Band-pass

LNA

LNA

LNA

photodiode

photodiode

photodiode

Stereo Rx:

Stereo Rx:

Stereo Rx:

2.3 & 2.8 MHz

2.3 & 2.8 MHz

2.3 & 2.8 MHz

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:

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

2.3 to 5.5V, 24 mA

mono Rx:

mono Rx:

1.7 MHz

1.7 MHz

HiFi stereo Tx:

HiFi stereo Tx:

2.3 & 2.8 MHz

2.3 & 2.8 MHz

LED

LED

buffer2

buffer2

SBY

SBY

buffer1

buffer1

TX2

TX2

VOX

VOX

TX1

TX1

TSH512

TSH512

LNA + ALC

LNA + ALC

LNA + ALC

LNA + ALC

photodiode

photodiode

Voice from the headset microphoneHiFi stereo

Voice from the headset microphoneHiFi stereo

LNA

LNA

RX2

RX2

RX1

RX1

filter

filter

1.7 MHz

1.7 MHz

Band-pass

Band-pass

TSH511

TSH511

SQUELCH

SQUELCHSQUELCH

SBY2

SBY2

SBY1

SBY1

Vcc

Vcc

Audio

Audio

buffer2

buffer2

Audio

Audio

buffer1

buffer1

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 p erf o rmance 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

BUF-IN2

GND

GND

3435

3435

BUF-IN2

GND

GND

33

33

GND

GND

MIX-IN2

DEC-LIM2B

DEC-LIM2B

LIM-IN2

AMP-OUT2

AMP-OUT2

44

44

1

1

LIM-IN2

GND

GND

4243

4243

LIM-OUT2

LIM-OUT2

40

40

41

41

MIX-IN2

VCC

VCC

MIX-OUT2

DEC-LIM2A

DEC-LIM2A

39

39

MIX-OUT2

36

36

3738

3738

AMP-IN2

AMP-IN2

VCC

VCC

LNA-OUT2

LNA-OUT2

VCC

VCC

LNA-IN

LNA-IN

GND

GND

LNA-OUT1

LNA-OUT1

VCC

VCC

AMP-IN1

AMP-IN1

DEC-LNA

DEC-LNA

2

2

3

3

4

4

5

5

LNA

LNA

6

6

7

7

8

8

9

9

amp.

amp.

10

10

11

11

12

12

13 14 15 16 17 18 19 20 21 22

13 14 15 16 17 18 19 20 21 22

AMP-OUT1

AMP-OUT1

limiteramp.

limiteramp.

limiter

limiter

LIM-IN1

LIM-IN1

GND

GND

FM demodulator

FM demodulator

RX2

RX2

TSH511

TSH511

RX1

RX1

FM demodulator

FM demodulator

DEC-LIM1B

DEC-LIM1

DEC-LIM1

DEC-LIM1B

LIM-OUT1

LIM-OUT1

MIX-IN1

MIX-IN1

VCC

VCC

Audio

Audio
buffers

buffers

Vref

Vref

MIX-OUT1

MIX-OUT1

Standby

Standby

SQUELCH

SQUELCH

GND

GND

32

32

SBY1

SBY1

31

31

SBY2

SBY2

30

30

BUF-OUT2

BUF-OUT2

29

29

VCC

VCC

28

28

DEC-OUT

DEC-OUT

27

27

GND

GND

26

26

BUF-OUT1

BUF-OUT1

25

25

MUTE-OUT

MUTE-OUT

24

24

MUTE-INT

MUTE-INT

23

23

MUTE-IN

MUTE-IN

BUF-IN1

BUF-IN1

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 demo dulator. It reduces AM parasitic
demodulation in the FM demodulator.

The FM demodulator is a classic quadrature detector that uses an external tank.

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 16Ω 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, re ctified and compared to a threshold t o produce th e
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 demodulato r output decreases, enab ling the audio
buffer.

Table 5. Infrared audio frequencies

IR frequency in MHz Applications

1.6 AM mono

1.7 FM mono

2.3 FM right channel

2.8 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). Beca use th e LNA minim um impedance lo ad is 1k
on each pin LNA-OUT1 or LNA-OUT2 must be 2k

Ω minimum.

Ω, the load impedance

The series 50

Ω 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 inter m ed ia te am p lifie r 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 L
is tuned on the receiving frequency.

The R
circuit. It allows to adjust the demodulation characteristics. For a given transmitting
deviation, a lower value of R
distortion.

The AC amplitude on pin 18 must not exceed 300mV
ESD diodes of the circuit.

resistor is connected in parallel with Llo and Clo to reduce the Q factor of the tank

lo

gives a lower demodulated amplitude and reduces the

lo

inductor and Clo capacitor. The tank circuit

lo

to prevent clipping by the internal

RMS

19/25

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 R
with the input pin of the noise amplifier MUTE-IN (pin 23). The detected noise is integrated
with the C
amplitude of the noise.

The comparator and the C
for the audio b u ffers. The squelch was designed with particular attention to avoid audio pop­noise.

capacitor connected to MUTE-INT pin. The DC voltage on this pin follows the

peak

resistor in series

MUTE

capacitor generate the fade-in and fade-out control ramps

MUTE

20/25

TSH511 General description

Figure 29. Squelch schematics

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. 50µs and 75µs are standard de-emphasis values.

After the de-emphasis network, the potentiometer controls the volume.
The rail-to-rail output st age of each audio buffer is able to drive 20mW into 16

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

10k

Ω (see the corresponding distortion curves).

The high input impedances of the audio buffers reduce the coupling capacitors to less than

0.1µF allowing space and cost saving.

Ω at 2.3V

Ω, 600Ω and

21/25

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 differ ent applications by using the
SBY1 & SBY2 standby pins.

Table 6. Standby pin description

SBY1

pin 32

Low Low
Low High

High Low ON OFF ON

High High ON OFF OFF

SBY2
pin 31

audio buffer1

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 V

9 Package information

RX1 &

ON ON ON stereo

, and is in Low state if connected to GND.

CC

RX2 Audio buffer 2 Typical use

mono on the

two outputs

mono on one

output

In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK

®

packages. These packages have a lead-free second le vel interconnect. The
category of second level interconnect is marke d on the pa ckage and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related t o soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www.st.com

22/25

.

TSH511 Package information

Figure 30. TQFP44 package mechanical data

Dimensions

Ref.

Min. Typ. Max. Min. Typ. Max.

A 1.6 0.063
A1 0.05 0.15 0.002 0.006
A2 1.35 1.40 1.45 0.053 0.055 0.057

B 0.30 0.37 0.45 0.012 0.015 0.018

C 0.09 0.20 0.004 0.008

D 11.80 12 12.20 0.465 0.472 0.480
D1 9.80 10.00 10.20 0.386 0.394 0.402
D3 8.00 0.315

E 11.80 12.00 12.20 0.465 0.472 0.480
E1 9.80 10.00 10.20 0.386 0.394 0.402
E3 8.00 0.315

e 0.80 0.031
L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.039

K 0°3.5°7° 0°3.5°7°

Millimeters Inches

0076922/D

23/25

Ordering information TSH511

10 Ordering information

Table 7. Order codes

Part number

Temperature

range

TSH511CF
TSH511CFT Tape & reel

TSH511CYFT

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.

(1)

-40°C to +85°C

11 Revision history

Date Revision Changes

01-Aug-2001 1 First release corresponding to Preliminary Data version of datasheet.

01-Dec-2003 2

01-April-2005 3 R

5-Jul-2007 4

Package Packaging Marking

TQFP44

TQFP44

(Automotive grade)

Datasheet updated for Maturity 30:
– Electrical parameters updated
– Application diagrams updated
– Releases on curves

value added on Table 2 on page 5

thja

Va l ue of F

reduced to 2.8MHz in LNA section in Table 4.

carrier

Format update.

Tray

TSH511C

Tape & reel TSH511CYF

12-Nov-2007 5 Added PPAP reference in Table 7: Order codes.

24/25

TSH511

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