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

Audio

Audio buffers

buffers

Vref

Standby

SQUELCH

3435

39

FM demodulator

3738

40

41

44

1

2

3

4

5

LNA

6

7

8

9

amp.

10

11

12

41

4243

limiteramp.

RX2

TSH511

RX1

limiter

13 14 15 16 17 18 19 20 21 22

The TSH511 forms a chipset with the dual transmitter TSH512.

33

32

31

30

29

28

27

26

25

24

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

GND

3435

GND

33

GND

MIX-IN2

GND

LIM-IN2

4243

LIM-OUT2

40

41

AMP-OUT2

44

1

DEC-LIM2B

LIM-IN2

MIX-IN2

VCC

MIX-OUT2

DEC-LIM2A

39

MIX-OUT2

36

3738

2

AMP-IN2

VCC

LNA-OUT2

VCC

LNA-IN

GND

LNA-OUT1

VCC

AMP-IN1

DEC-LNA

Table 1. Pin descriptions

2

3

4

5

6

7

8

9

10

11

LNA

amp.

12

13 14 15 16 17 18 19 20 21 22

AMP-OUT1

limiteramp.

RX2

TSH511

RX1

limiter

LIM-IN1

DEC-LIM1

LIM-OUT1

DEC-LIM1

GND

LIM-OUT1

Pin Pin name Related to Direction

FM demodulator

MIX-IN1

DEC-LIM1B

(1)

VCC

Audio

Audio buffers

buffers

Vref

MIX-OUT1

Standby

SQUELCH

GND

32

SBY1

31

SBY2

30

BUF-OUT2

29

VCC

28

DEC-OUT

27

GND

26

BUF-OUT1

25

MUTE-OUT

24

MUTE-INT

23

MUTE-IN

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

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

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

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

, with

RMS

0.6 %

= 2.8MHz 18 22 28 dB

30

2

= 2.8MHz

127

95 30

22

mV

= 2.8MHz 16 20 dB

kΩ pF

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

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

CC

V

8/25