Datasheet TSH512CFT, TSH512CF, TSH512 Datasheet (SGS Thomson Microelectronics)

TSH512

TSH512

HiFi stereo/mono infrared transmitter

HiFi stereo/mono infrared transmitter

Stereo sub-carrier gen er ator

Stereo sub-carrier gen er ator

■ Supply voltage: 2.3V to 5.5V

■ Carriers frequency range: 0.4 to 11 MHz

■ High versatility: I/O pins for each section

■ Two FM transmitters for stereo

■ Sinusoidal carriers for high spectral purity

■ Micro or line level preamplifiers with ALC

■ VOX function to save on battery power

■ Transmitter 2 Standby for mono operation

DESCRIPTION

The TSH512 is a 0.4 to 11 MHz dual FM transmit­ter. Access pins to each section give a high versa­tility and allow several applica tions: stereo head­phone, multimedia headset, audio sub-carrier
generator.
The TSH512 integrates in one chip:
Low-noise audio preamplifiers with ALC (Automat­ic Level Control), frequency modulated oscillators,
and linear output buffers to drive external tr ansis­tors. The sinusoidal carriers facilitates the filtering
and allows high performance audio transmission.
The VOX (Voice Op erated Transmit) circui try dis­ables the output buffer when there is no audio t o
save battery power.
For MONO applications, the STAND-BY pin en­ables one transmitter only, reducing the supply
current.
The TSH512 forms a chipse t with the dua l receiv­er TSH511.

APPLICATIONS

■ Infrared HiFi stereo transmitter

■ Infrared Headsets

■ Stereo sub-carrier for video transmitters

■ Voice operated wireless webcams

■ FM IF transmit systems

ORDER CODE

Part Number

TSH512CF -40°C to

TSH512CFT -40°C to

Temperature

Range

+85°C

+85°C

Package Conditionning Marking

TQFP44 Tray TSH512C

TQFP44 Tape & reel TSH512C

PACKAGE

F

TQFP44

10 x 10 mm

PIN CONNECTION (top view)

40

40

39

41424344

39

41424344

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

+

+-+

-

-

ALC

ALC

LNA

LNA

+

+-+

-

-

LNA

LNA

+

+-+

ALC

ALC

-

-

12 13 14 15 16 17 18 19 20 21 22

12 13 14 15 16 17 18 19 20 21 22

PEA

PEA

+

+-+

-

-

TX2

TX2

TSH512

TSH512

VOX

VOX

TX1

TX1

+

+-+

-

-

PEA

PEA

3738

3738

VCO

VCO

VCO

VCO

36

36

Output

Output
buffer

buffer

Output

Output
buffer

buffer

3435

3435

Monostable

Monostable

33

33

32

32

31

31

30

30

29

29

28

28

27

27

26

26

25

25

24

24

23

23

December 2002

1/19

TSH512

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

Vcc

Supply voltage

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 juncti on to case 14 °C/W

Latch-up

Class

2)

ESD sensitive device: handling precautions required

ESD

except pin

20 & 36

1. All voltage s values, ex cept differential volt age, are wi th respect to network grou nd terminal

2. Corporate ST Microelectr oni cs proced ure number 0018695

3. ElectroS tatic Disch arge pulse (E SD pulse) sim ul ating a human body discharge of 10 0 pF through 1.5k

4. Discharge to Ground of a device that has been previously charged.

5. ElectroS tatic Disch arge pulse (E SD pulse) approximati ng a pulse of a ma chine or mec hanical equi pment.

HBM: Human Body Model
CDM: Charged Device Model
MM: Machine Model

OPERATING CONDITIONS

Symbol Parameter Value Unit

Vcc Supply voltage 2.3 to 5.5 V

f

audio

f

carrier

Audio frequency range 20 to 20,000 Hz
Carrier frequency range 0.4 to 11 MHz

1)

7V

A

3)

4)

5)

2
1

0.2

Ω

kV

BLOC DIAGRAM

VCO-OUT2

VCO-OUT2

VCO-A2

VCO-A2

VCO-A2

Monostable

Monostable

Monostable

VCO-A1

VCO-A1

VCO-A1

VCO-OUT2

VCO-B2

VCO-B2

VCO-B2

3435

3435

3435

GND

GND

GND

33

33

33

32

32

32

BUF-IN2

BUF-IN2

BUF-IN2

BUF-OUT2

BUF-OUT2

BUF-OUT2

31

31

31

GND

GND

GND

30

30

30

VOX-TIMER

VOX-TIMER

VOX-TIMER

29

29

29

28

28

28

VOX-INTN

VOX-INTN

VOX-INTN

27

27

27

VOX-MUTE

VOX-MUTE

VOX-MUTE

VCC

VCC

VCC

26

26

26

BUF-OUT1

BUF-OUT1

BUF-OUT1

25

25

25

24

24

24

BUF-IN1

BUF-IN1

BUF-IN1

GND

GND

GND

23

23

23

VCO-B1

VCO-B1

VCO-B1

VCO-OUT1

VCO-OUT1

VCO-OUT1

DEC2

DEC2

DEC2

MIC-BIAS2

MIC-BIAS2

MIC-BIAS2

GND

GND

GND

VCC

VCC

VCC

SBY

SBY

SBY

VOX-INTS

VOX-INTS

VOX-INTS

VOX-SENS

VOX-SENS

VOX-SENS

VCC

VCC

VCC

GND

GND

GND

MIC-BIAS1

MIC-BIAS1

MIC-BIAS1

DEC1

DEC1

DEC1

VCO-BIAS2

VCO-BIAS2

PEA-INN2

PEA-INN2

PEA-INN2

PEA-INN1

PEA-INN1

PEA-INN1

-

-

-

+

+

+-+

-

-

-

PEA-OUT2

PEA-OUT2

PEA-OUT2

PEA

PEA

PEA

+

+

+-+

VOX

VOX

VOX

PEA

PEA

PEA

PEA-OUT1

PEA-OUT1

PEA-OUT1

Bias

Bias

BiasBias

TX2

TX2

TX2

TX1

TX1

TX1

Bias

Bias

BiasBias

VCO-BIAS2

VCO-BIAS1

VCO-BIAS1

VCO-BIAS1

3738394041

3738394041

3738394041

VCC

VCC

VCC

VCO

VCO

VCO

VCO

VCO

VCO

VCC

VCC

VCC

36

36

36

Output

Output

Output
buffer

buffer

buffer

Output

Output

Output
buffer

buffer

buffer

ALC-INT2

ALC-INT2

ALC-INT2

LNA-OUT2

LNA-OUT2

LNA-OUT2

LNA-INP2

LNA-INN2

LNA-INP2

LNA-INN2

LNA-INP2

LNA-INN2

424344

424344

424344

1

1

1

2

2

2

3

3

3

4

4

4

5

5

5

6

6

6

7

7

7

8

8

8

9

9

9

10

10

10

11

11

11

+

+

+-+

-

-

-

ALC

ALC

ALC

LNA

LNA

LNA

Bias

Bias

BiasBias

Bias

Bias

BiasBias

LNA

LNA

LNA

+

+

+-+

-

-

-

12

12

12

13 14 15 16 17 18 19 20 21 22

13 14 15 16 17 18 19 20 21 22

13 14 15 16 17 18 19 20 21 22

LNA-INP1

LNA-INP1

LNA-INP1

LNA-INN1

LNA-INN1

LNA-INN1

+

+

+-+

-

-

-

LNA-OUT1

LNA-OUT1

LNA-OUT1

TSH512

TSH512

TSH512

ALC

ALC

ALC

ALC-I NT1

ALC-I NT1

ALC-I NT1

2/19

PIN DESCRIPTION

TSH512

Pin Pin name related to

1 DEC2 TX2 - Decoupling capacitor for internal voltage reference
2 MIC-BIAS2 TX2 O Microphone bias
3 GND - - GROUND
4 VCC - - SUPPLY VOLTAGE
5 SBY TX1 & TX2 I Standby Control (INPUT pin)
6 VOX-INTS TX1 & TX2 - Time constant terminal for Audio Signal integrator in VOX
7 VOX-SENS TX1 & TX2 - Gain adjustment for VOX input sensitivity
8 VCC - - SUPPLY VOLTAGE
9 GND - - GROUND
10 MIC-BIAS1 TX1 O Microphone bias
11 DEC1 TX1 - Decoupling capacitor for internal voltage reference
12 LNA-INP1 TX1 I LNA positive input
13 LNA-INN1 TX1 I LNA negative input
14 LNA-OUT1 TX1 O LNA output
15 ALC-INT1 TX1 - Time constant terminal for integrator in ALC
16 PEA-INN1 TX1 I Pre-Emphasis Amplifier negative input
17 PEA-OUT1 TX1 O Pre-Emphasis Amplifier output
18 VCO-BIAS1 TX1 O Bias for external VCO components
19 VCC - - Supply Voltage
20 VCO-A1 TX1 - Oscillator component connection
21 VCO-B1 TX1 - Oscillator component connection
22 VCO-OUT1 TX1 O VCO output
23 GND - - Ground
24 BUF-IN1 TX1 I Input to the output buffer
25 BUF-OUT1 TX1 O Output of the output buffer
26 VCC - - Supply Voltage
27 VOX-MUTE TX1 & TX2 O Mute control (Output pin) in VOX
28 VOX-INTN TX1 & TX2 - Time constant terminal for Noise integrator in VOX
29 VOX-TIMER TX1 & TX2 - Rise time for timer in VOX
30 GND - - Ground
31 BUF-OUT2 TX2 O Output of the output buffer
32 BUF-IN2 TX2 I Input to the output buffer
33 GND - - Ground
34 VCO-OUT2 TX2 O VCO output
35 VCO-B2 TX2 - Oscillator component connection
36 VCO-A2 TX2 - Oscillator component connection
37 VCC - - Supply Voltage
38 VCO-BIAS2 TX2 O Bias for external VCO components
39 PEA-OUT2 TX2 O Pre-Emphasis Amplifier output
40 PEA-INN2 TX2 I Pre-Emphasis Amplifier negative input
41 ALC-INT2 TX2 - Time constant terminal for internal peak detector in ALC
42 LNA-OUT2 TX2 O LNA output
43 LNA-INN2 TX2 I LNA negative input
44 LNA-INP2 TX2 I LNA positive input

1. pin direction: I = inp ut pi n, O = output pin, - = pi n t o connect to supply or deco upl i ng capacito rs or extern al components

direction

1)

Pin description

3/19

TSH512

TYPICAL SCHEMATIC
Stereo infrared transmitter

AUDIO IN TX2

44 42

1

+ +

MICRO BIAS TX2

STANDBY

Cpeak

Csens

VOX Delay

Rpeak

VOX Sensitivity

+

2

3

Vcc

4

5

+

6

7

Rsens

Vcc

8

.

Clna1

+

Rlna1

Clna2

ATTACK-DECAY TIME

Rlna2

LNA GAIN : 0dB to 40dB

43

Cpen1

Ralc

Calc

41 40 39 37 36 35 34

47k

Rpen1

PRE-EMPHASIS NETWORK

Rpen2

PEA

ALC

LNA

Transmitter 2 (TX2)

TSH512

100nF

Rbias1

Varicap

Cv

47k

Rbias2

51

Vcc

38

Varicap BIAS

Rvco

Cp

Cs

51pF 51pF

CL

L

51pF

Vcc

33

VCO TX2

IR

Vcc

IR

Varicap

MONO
STABLE

Pulse Width Adjust

32

31

30

29

28

27

26

Ctrig

Rcomp

Ccomp

VOX-MUTE

Vcc

BIAS

+

1M

+

10µF

MICRO BIAS TX1

.

AUDIO IN TX1

9

10

11

12 14

25

ALC

LNA

13

Rlna2

Rlna1

+

Clna1

LNA GAIN : 0dB to 40dB

Clna2

15 16 17

Calc

Ralc

ATTACK-DECAY TIME

Rpen2

Rpen1

Cpen1

PRE-EMPHASIS NETWORK

Transmitter 1 (TX1)

PEA

Varicap BIAS

18

51

47k

100nF

19 20 21

Vcc

Rvco

47k

Rbias2

Varicap

Rbias1

VCO TX1

51pF 51pF

Cs

Cp

Cv

24

OUTPUT BUFFER OUTPUT BUFFER

23

22

L

CL

51pF

BIAS

4/19

TSH512

INFRARED STEREO TRANSMITT ER APPLICATION (ie: stereo headphone)

The HiFi stereo audio is amplified and level regulated by ALC. The carrier of each transmitter TX1 or TX2
of the TSH512 is modulated in FM and bufferized to attack the LED final stage.

IR stereo HiFi transmitter Headphone side

IR stereo HiFi transmitter Headphone side

2.3 MHz

2.3 MHz

filter

filter

RX2

RX2

RX1

RX1

filter

filter

2.8 MHz

2.8 MHz

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 < 20 mA stereo

Icc < 20 mA stereo

TSH512 TSH511

TSH512 TSH511

buffer2

TX2

TX2

VOX

VOX

TX1

TX1

buffer2

buffer1

buffer1

SBY

SBY

Vcc

Vcc

LED

LED

F

F

i

i

H

H

.

.

2

2

photodiode

photodiode

LNA

LNA

s

s

r

r

e

e

i

i

r

r

r

r

a

a

:

:

c

c

o

o

z

z

e

e

r

r

H

H

e

e

t

t

M

M

s

s

i

i

8

8

.

.

2

2

&

&

3

3

SBY1

SBY1

SQUELCH

SQUELCHSQUELCH

SBY2

SBY2

Vcc: 2.3 to 5.5V

Vcc: 2.3 to 5.5V

Current < 15 mA

Current < 15 mA

Audio

Audio

amp2

amp2

Audio

Audio
amp1

amp1

20 mW / 16 Ω

20 mW / 16 Ω

20 mW / 16 Ω

20 mW / 16 Ω

SUB-CARRIER GENERATOR APPLICATION: voice operated wireless camera

Thanks to the operating frequency the TSH512 offers the possibility to generate usual audio sub-carriers
for video application s. The camera can be voi ce activated us ing the V OX-MUTE output of the T SH512.
The TSH512 also provides bias, amplification, ALC for the electret microphone.

Miniature camera

Miniature camera

Video

Video

Σ

ΣΣ

Sub-carrier

buffer2

buffer2

SBY

SBY

buffer1

buffer1

Sub-carrier

Vcc

Vcc

VOX-MUTE

VOX-MUTE

6 or 6.5 MHz

6 or 6.5 MHz
Audio sub-carrier

Audio sub-carrier

Stand-By

Stand-By

Electret Condenser

Electret Condenser
Microphone

Microphone

TSH512

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

LNA + ALC

LNA + ALC

TX2

TX2

VOX

VOX

TX1

TX1

6 or 6.5 MHz

6 or 6.5 MHz

filter

filter

FM 2.4 GHz

FM 2.4 GHz
transmitter

transmitter

Stand-By

Stand-By

5/19

TSH512

MULTIMEDIA APPLICATION: HEADSET SIDE

The TSH512 is used in mono to transmit the signal of the Electret Condenser Microphone of the headset.
The circuit is suppli ed by batteries and the VO X function s witche s off t he o utpu t stages t o s pa re energy .
The usual working frequency is 1.7 MHz for infrared mono operation.

TSH511 & 512 supply:

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

2.3 to 5.5V, 25 mA

Voicetransmittedto thePC

Voicetransmittedto thePC

TSH512

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

MIC. BIAS

MIC. BIAS

LNA + ALC

LNA + ALC

TX2

TX2

VOX

VOX

TX1

TX1

1.7 MHz

1.7 MHz

Band-pass

Band-pass

filter

filter

buffer2

buffer2

buffer1

buffer1

SBY

SBY

HiFi stereo from the PC:

HiFi stereo from the PC:

2x 20 mW /16 Ω

2x 20 mW /16 Ω

Vcc

Vcc

Vcc

Vcc

LED

LED

TSH511

TSH511

Audio

Audio
amp2

amp2

Audio

Audio
amp1

amp1

1.7 MHz

1.7 MHz
reject

reject

filter

filter

RX2

RX2

SQUELCH

SQUELCH

RX1

RX1

SBY1

SBY2

SBY1

SBY2

filter

filter

1.7 MHz

1.7 MHz
reject

reject

Microphone Tx:

Microphone Tx:

1.7 MHz

1.7 MHz
carrier

carrier

2.3 MHz

2.3 MHz

Band-pass

Band-pass

filter

filter

filter

filter

2.8 MHz

2.8 MHz

Band-pass

Band-pass

LNA

LNA

photodiode

photodiode

Stereo Rx:

Stereo Rx:

2.3 & 2.8 MHz

2.3 & 2.8 MHz

MULTIMEDIA APPLICATION: COMPUTER SIDE
In multimedia application, the TSH512 transmits the HiFi stereo from the PC to the headset.

TSH511 & 512 supply:

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

2.3 to 5.5V, 24 mA

Voice from the headset microphoneHiFi stereo

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

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
amp2

amp2

Audio

Audio
amp1

amp1

6/19

TSH512

ELECTRICAL CHARACTERISTICS

Vcc = 2.7V, Tamb = 25°C, f

Symbol Parameter Test condition Min Typ Max Unit

Overall Circuit

I

CC_TOT

I

CC_SBY

LNA Sections (for TX1 and TX2)

GBP

LNA

Rin

LNA

THD

LNA

En Equivalent Input Noise Voltage

Automatic Level Control (ALC) Section

G

ALC

V

ALC_OUT

Pre-Emphasis Amplifier (PEA) Section

GBP

PEA

V

Opp-PEA

Audio LNA+ALC+PEA sections

THD

ALC

THD

AGC

ΦΜ

PEA

Current consumption,
TX1 and TX2 are on.

Current consumption
with TX2 in stand-by:
SBY (pin5) active

Gain Band Product No external load 7 MHz
Input Resistance on positive input:

(LNA-INP1 pin 12 or
LNA-INP2 pin 44)

Total Harmonic Distortion

Voltage Gain 20 dB
Regulated Output Level

(At positive input of the PEA amplifier)

Gain Band Product
(PEA-OUT1 pin17 or PEA-OUT2 pin39)

Output voltage RL = 22k

Total Harmonic Distorsion
in linear region on PEA-OUT1 pin17 or

PEA-OUT2 pin 39

Total Harmonic Distorsion in compres­sion region

Phase Margin at
PEA-OUT1 pin 17 or
PEA-OUT2 pin 39

audio

= 1 kHz, f

= 2.8 MHz (unless otherwise specified)

carrier

TX1 on, TX2 on,
MIC-BIAS1 and
MIC-BIAS2 not used:

VOX-MUTE=1, output

16

buffers on
VOX-MUTE=0, output

buffers off

11

TX1 on, TX2 off,
MIC-BIAS1 and
MIC-BIAS2 not used:

VOX-MUTE=1, output

10

buffers on
VOX-MUTE=0, output

buffers off

7

30 k

G

=0dB Vout

LNA

=700mV

G

=40dB, at f=1kHz

LNA

Rs=390Ω,

Rfeedback= 39k

PP

LNA

0.01 0.05 %

6 nV/√Hz

Ω

600 710 800 mVpp

No Load 9 MHz

Ω

= 0 dB, f =1kHz

G

LNA

< 25mV

Vin

ALC

(-30dBu)

rms

550 mVpp

0.05 0.15 %

RL = 22 kΩ tied to GND
(Vin)

ALC

= 36mV

rms

1.3
(-27dBu)
(Vin)

= 100mV

ALC

rms

3

(-18dBu)
RL = 22 kΩ tied to GND
RL = 22 k
LNA and PEA at unity

gain

Ω

70 °

Vin = 40mV

18.6

12.8

11.5

8

1.7

4

mA

mA

mA

mA

Ω

%

%

7/19

TSH512

Symbol Parameter Test condition Min Typ Max Unit

Microphone Biasing Section

V

MIC-BIAS

V

∆

MIC-BIASVMIC-BIAS

I

MIC-BIAS

Microphone Biasing Voltage
(see page 15)

MIC-BIAS current capability

temperature coefficient

I

MIC-BIAS

Over temperature range

[0, 70°C]
[-40, 85°C]
I

MIC-BIAS

over V
[2.3V-5.5V]

= 2.5 mA

= 2.5 mA

range

CC

2.15 2.25 2.35 V

260
460

2.5 mA

ppm/°C

PSRR-

MIC-BIAS

en

MIC-BIAS

Power Supply Rejection Ratio of
MIC-BIAS

Equivalent input noise of MIC-BIAS

Vox Operated Switch (VOX) Section

I

VOX-TIMER

VTH-

VOX-TIMER

V

MUTE_L

Monostable Current Source
(VOX-TIMER pin 29)

Threshold voltage of the Monostable

(Time Constant)

Low Level Output Voltage

(VOX-MUTE Pin27)

V

MUTE_H

High Level Output Voltage

(VOX-MUTE Pin27)

Standby

V

SBY_IL

max

V

SBY_IH

min

Max. Low Level Input Voltage of

Standby input (SBY Pin5)

Min. High Level Input Voltage of

Standby input (SBY Pin5)

VCO Section

VCO-BIAS output voltage

V

VCO-BIAS

(VCO-BIAS1 pin18 or VCO-BIAS2 pin

38)

I

VCO-BIAS

V

δ

VCO-BIAS

PN

LO

SVR

VCO-BIAS

VCO-BIAS output current capability

VCO-BIAS voltage drift

Phase Noise

Supply Voltage Rejection Ratio of
VCO-BIAS

VCO Output Impedance

Z

VCO-OUT

(VCO-OUT1 pin22 or VCO-OUT2
pin34)

@ 1kHz and
V ripple = 25mV

=2.7V

V

CC

=5.0V

V

CC

Vcc = 2.7V

RMS

50 dB
22

42

nV/√Hz

5µA

1.4 V
RL = 2 k

RL = 2 k

With No Load 1.43 1.47 1.51

V

2.3V < Vcc < 5.5V
[0, 70°C] Vcc=2.7V
[0, 70°C] Vcc=5.0V
[-40, 85°C] Vcc=2.7V
[-40, 85°C] Vcc=5.0V

Ω

Ω

VCO-BIAS

> 1.38V

0.2 V

Vcc-0.3 V

0.1xV

cc V

cc V

0.9xV

V

40 µA

8
+265
+356
+265
+356

mV/V
ppm/°C
ppm/°C
ppm/°C
ppm/°C

@ 1kHz,
L = 120µH (Q=30) and
R

no connected

VCO

-80 dBc

With No Load 43 dB

400

Ω

DC

8/19

TSH512

Symbol Parameter Test condition Min Typ Max Unit

ZL

VCO-OUT

min

V

VCO-OUT

Output Buffer

Z

BUF-IN

G

OB

V

BUF-OUT

AC

V

BUF-OUT

DC
H2

BUF-OUT

H3

BUF-OUT

Minimum Load Impedance 1 k

L= 120µH (Q=30),

VCO Output Level

Input Impedance

(BUF-IN1 pin24 or BUF-IN2 pin32)

VCO ouput connected to
Output Buffer input,

= 100K

R

VCO

0.58 0.62 0.66 Vpp

400 k

Linear Voltage Gain 10 dB

Output AC voltage at 1dB compression

Z

=2kΩ

L

1.3

point

Output AC voltage (BUF-OUT1 pin 25

or BUF-OUT2 pin 31)

Output DC voltage

2nd Harmonic Level

3rd Harmonic Level

=2kΩ

Z

L

V

= 0.60Vpp

BUF-IN

DC Output current=

0.4 mA
V

BUF-OUT

Z

L

V

BUF-OUT

Z

L

=1.2Vpp and

=2kΩ

=1.2Vpp and

=2kΩ

1.35

1.5 1.7

1.25

-40 dBc

-30 dBc

Ω

Ω

Vpp

V

DC

9/19

TSH512

I

(mA)

Supply current vs. Supply voltage

18

TX1+TX2+Buffers

16

TX1+TX2

14

TX1+Buffers

12
10

CC

8

TX1

6
4
2
0

0123456

VCC(V)

AUDIO SECTION
LNA Distorsion vs. Frequency

1

VCC = 2.7V
G

= 0dB

LNA

V

= 700mV

OUT-LNA

Supply current vs. Temperature

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

LNA Distorsion vs. Frequency

10

pp

VCC = 2.7V
G

= 40dB

LNA

V

= 700mV

OUT-LNA

pp

+N (%)

0.1

LNA

THD

0.01
10 100 1000 10000

Frequency (Hz)

LNA Distorsion vs. LNA Output Voltage

100

G

= 0dB

LNA

10

1

+N (%)

LNA

0.1

THD

VCC = 2.3V

0.01

1E-3

0 200 400 600 800 1000 1200 1400 1600

V

OUT-LNA

VCC = 2.7V

VCC = 5.5V

(mVpp)

+N (%)

1

LNA

THD

0.1
10 100 1000 10000

Frequency (Hz)

PEA Output Voltage vs. LNA Input Voltage

0.8

0.7

0.6

)

0.5

PP

(V

0.4

OUT-PEA

V

0.3

0.2

0.1

0.0

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40

VCC = 2.3V

VCC = 2.7V

V

IN-LNA(Vpp

VCC = 5.5V

R

= 22KΩ

L-PEA

G

= 0dB

LNA

G

= 0dB

PEA

)

10/19

TSH512

PEA Output Voltage vs. Te m pera ture

800
700
600

)

500

PP

(V

400

OUT-PEA

V

300
200

R

=22KΩ

L-PEA

G

= 0dB

LNA

100

G

= 0dB

PEA

0

-40-200 20406080

T

AMB

VCC = 2.7V

(°C)

PEA Output Voltage vs. Resistor Load

600

VCC = 2.7V

500

)

PP

(mV

400

OUT-PEA

V

300

VCC = 5V

MIC-BIAS Voltage vs. MIC-BIAS Current

2.4

(V)

V

2.2

2.0

MIC-BI AS

VCC = 2.3V

1.8

1.6

01234

I

(mA)

MIC-BIAS

LNA+ALC+PEA Distorsion vs. Input Voltage

10

R

= 22KΩ

L-PEA

G

= 0dB

VCC = 2.7V

1

+N (%)

LNA+ALC+PEA

0.1

THD

VCC = 2.3V

LNA

G

= 0dB

PEA

200

100 1k 10k 100k 1M

R

(Ω)

L-PEA

MIC-BIAS Output Voltage vs. Supply Voltag e

4.5

4.0

3.5

(V)

3.0

MIC-BIAS

V

2.5

2.0

1.5

I

= 2.5mA

MIC-BIAS

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

VCC(V)

VCC = 5.5V

0.01

0.02 0.04 0.06 0.08 0.10

VIN(Vpp)

MIC-BIAS Output Voltage vs. Tempera t ure

2.4

VCC = 2.7V
I

= 2.5mA

MIC-BIAS

2.3

(V)

MIC-BIAS

V

2.2

2.1

-40-30-20-100 1020304050607080

T

(°C)

AMB

11/19

TSH512

MIC-BIAS Voltage vs. MIC-BIAS Current

2.40
VCC=2.7V

2.35

(V)

2.30

MIC-BI AS

V

2.25

2.20

0123

I

(mA)

MIC-BIAS

MIC-BIAS Voltage vs. MIC-BIAS Current

4.8

VCC = 5.5V

(V)

4.6

4.4

VOX Delay vs. C

35

VCC = 2.7V

30

25

(s)

20

Delay

15

VOX

10

5

0

0 102030405060708090100

Capacitor

TRIG

C

TRIG

(µF)

Monostable Current Source vs. Temperature

7

VCC = 2.7V

6

5

(µA)

4

MIC-BI AS

V

4.2

4.0

3.8
0123456

I

(mA)

MIC-BIAS

3

VOX-TIMER

I

2

1

0

-40.0 -20.0 0.0 20.0 40.0 60.0 80.0

T

(°C)

AMB

12/19

RF SECTION
VCO Out put Voltage vs. R

VCO

TSH512

VCO-BIAS Voltage vs. Tem perature

700

VCC = 2.7V

650

L = 120µH (Q=30)
F

= 2.8MHz

CARRIER

600

)

PP

550

(mV

500

VCO-OUT

450

V

400
350
300

10k 100k 1M

R

(Ω)

VCO

VCO-BIAS Voltage vs. VCO-BIAS Current

1.45
VCC = 2.7V
R

= 51Ω

filter

C

= 470nF

filter

1.40

(V)

VCO-BIAS

V

1.35

1.30

0 1020304050

I

(mA)

VCO-BIAS

1.6

VCC = 2.7V
No Load

1.5

(V)

VCO-BIAS

V

1.4

1.3

-40-30-20-100 1020304050607080

T

(°C)

AMB

VCO & Output Buffer Spectrum

60
50
40
30
20

(dBmV)

10

BUF-OUT

V

0

-10

-20

-30

2.795

2.796

2.797

2.798

2.799

2.800

2.801

Frequency(MHz)

VCC = 2.7V

L = 120µH (Q=30)
R

= no connected

VCO

ZL = 2kΩ
BW = 200Hz
F

= 2.8MHz

CARRIER

2.802

2.803

2.804

2.805

VCO & Output Buffer Spectrum

60
50
40
30
20

(dBmV)

10

BUF-OUT

V

0

-10

-20

-30
3 6 9 121518

Frequency(MHz)

VCC = 2.7V
R

VCO

ZL = 2kΩ
F

CARRIER

= 22kΩ

= 2.8MHz

13/19

TSH512

GENERAL DESCRIPTION

The TSH512 is a 0.4 to 11 MHz dual FM analog
transmitter. This circuit offers the functions need­ed for an advance d infrared S TER EO transmitter.
The access pins for each section allow a high ver­satility and therefore a lot of applications: mono in­frared transmitter, stereo transmitter, mono/stereo
sub-carrier generator for video transmissions (ie:
popular 2.4GHz video links).

Figure 1 : TSH512 bloc diagram

VCO-BIAS2

VCO-BIAS2

PEA-INN2

PEA-INN2

PEA-INN2

PEA-OUT 2

PEA-OUT 2

PEA-OUT 2

40

40

40

39

39

39

Bias

Bias

BiasBias

PEA

PEA

PEA

+

+

+-+

-

-

-

TSH512

TSH512

TSH512

VOX

VOX

VOX

+

+

+-+

-

-

-

PEA

PEA

PEA

Bias

Bias

BiasBias

PEA-INN1

PEA-INN1

PEA-INN1

PEA-OUT 1

PEA-OUT 1

PEA-OUT 1

TX2

TX2

TX2

TX1

TX1

TX1

VCO-BIAS2

VCO-BIAS1

VCO-BIAS1

VCO-BIAS1

DEC2

DEC2

DEC2

MIC-BIAS 2

MIC-BIAS 2

MIC-BIAS 2

GND

GND

GND

VCC

VCC

VCC

SBY

SBY

SBY

VOX-INTS

VOX-INTS

VOX-INTS

VOX-SENS

VOX-SENS

VOX-SENS

VCC

VCC

VCC

GND

GND

GND

MIC-BIAS 1

MIC-BIAS 1

MIC-BIAS 1

DEC1

DEC1

DEC1

ALC-INT2

ALC-INT2

LNA-INP2

LNA-INP2

LNA-INP2

1

1

1

2

2

2

3

3

3

4

4

4

Bias

Bias

BiasBias

5

5

5

6

6

6

7

7

7

Bias

Bias

BiasBias

8

8

8

9

9

9

10

10

10

11

11

11

12 13 14 15 16 17 18 19 20 21 22

12 13 14 15 16 17 18 19 20 21 22

12 13 14 15 16 17 18 19 20 21 22

LNA-INP1

LNA-INP1

LNA-INP1

ALC-INT2

LNA-INN2

LNA-OUT2

LNA-INN2

LNA-OUT2

LNA-INN2

LNA-OUT2

41424344

41424344

41424344

+

+

+-+

-

-

-

ALC

ALC

ALC

LNA

LNA

LNA

+

+

+-+

-

-

-

LNA

LNA

LNA

+

+

+-+

ALC

ALC

ALC

-

-

-

ALC-INT1

ALC-INT1

ALC-INT1

LNA-INN1

LNA-INN1

LNA-INN1

LNA-OUT1

LNA-OUT1

LNA-OUT1

VCO-OUT2

VCO-OUT2

Output

Output

Output
buffer

buffer

buffer

Output

Output

Output
buffer

buffer

buffer

VCO-A2

VCO-A2

VCO-A2

Monostable

Monostable

Monostable

VCO-A1

VCO-A1

VCO-A1

VCO-OUT2

VCO-B2

VCO-B2

VCO-B2

3435363738

3435363738

3435363738

GND

GND

GND

33

33

33

32

32

32

BUF-IN2

BUF-IN2

BUF-IN2

31

31

31

BUF-OUT2

BUF-OUT2

BUF-OUT2

30

30

30

GND

GND

GND

29

29

29

VOX-TIM ER

VOX-TIM ER

VOX-TIM ER

28

28

28

VOX-INTN

VOX-INTN

VOX-INTN

27

27

27

VOX-MUTE

VOX-MUTE

VOX-MUTE

26

26

26

VCC

VCC

VCC

25

25

25

BUF-OUT1

BUF-OUT1

BUF-OUT1

24

24

24

BUF-IN1

BUF-IN1

BUF-IN1

23

23

23

GND

GND

GND

VCO-B1

VCO-B1

VCO-B1

VCO-OUT1

VCO-OUT1

VCO-OUT1

VCC

VCC

VCC

VCO

VCO

VCO

VCO

VCO

VCO

VCC

VCC

VCC

in multicarrier systems (se e the c ha pter ’ Appl ica­tions’).

The Voice Operated Transmit (VO X) function au­tomatically detects whe n an audio signal appear
over the background noise.

The stand-by of the second transmitter reduces
consumption in mono operation.

LNA section: Low Noise Amplifier

For each transmitter, the audio source is connect­ed to the LNA. The LNA stage is a low noise oper­ationnal amplifier typically usable with a gain from
0dB to 40dB.

Figure 2 : LNA schematic

Each audio input is amplified with a Low Noise
Amplifier (LNA section) allowing connection to line
level sources or directly t o a microphone. Built-in

voltage references ’MIC BIAS’ provide bias for
Electret Condenser Microphones (ECM) with a
high power supply rejection ratio.

Each audio path includes also an Automatic Level
Control (ALC) to limit the overmodulation and the
distorsion on very high signal amplitudes. The fol­lowing operationnal amplifier (PEA) allows a
preamphasis transfer func tion before modulating
the varicap diode.

Built-in voltage references (VCO-BIAS) offers a
regulated voltage to bias the varicap diodes. The
Voltage Controlled Oscillator (VCO) is an integrat­ed oscillator gi ving typical ly 60 0 m V peak to peak
at 2.8 MHz.

The Output Buffer section amplifies linearly the
FM carrier to provide a sinusoidal output. This si­nusoidal signals reduce the intermodul ation prod­ucts beetween the carriers, specially in two-way or

The LNA gain is given by:

(dB) = 20.Log(1+R

G

LNA

LNA2/RLNA1

)
The High-pass cut-off frequency is:
f

= 1/(2.πR

HPF

LNA1.CLNA1

)

The Lowpass filter cut-off frequency is:
f

= 1/(2.πR

LPF

LNA2.CLNA2

)

If you connect an external circuit to the LNA out­put, the impedance of this external circuit should
be higher than 10 M

Ω and the capacitance lower

than 50 pF in order to keep a good stability.

14/19

TSH512

Electret Condenser Microph on e source

When a Electret Condenser Micropho ne (ECM) is
used, a high gain LNA is recommand ed, but low
frequencies have to be attenuated. Th e ECM has
to be biased with a stable and clean reference
voltage.The TSH512 o ffers you the LNA and t he
MIC-BIAS sections to perform this functions. (see
MIC-BIAS chapter).

Figure 3 : Electret Condenser Microphone source

Moreover, the supply rejection ratio is guaranteed
better than 50 dB without any decoupling capaci­tor. To address biasing of most of the micro­phones, the current drive capability is 2.5 mA. The
MIC-BIAS voltage depend linearly on the supply
voltage Vcc (refer to the curve ’MIC-BIAS vs.
VCC’).

ALC section: Automatic Level Control

Both transmitters of the TSH512 are including Au­tomatic Level Control (ALC). When the level of
the audio signal is too high, the ALC compress the
signal in order to avoi d overmodulation of the FM
VCO. Therefore, the A LC reduces the distorsion
and keep a reduced transmit spectrum with very
high amplitude signals.

Figure 4 : Automatic Level Control Schematic

The capacitor C in serie with the microphone
stops the DC coming from MIC-BIAS.
The resistor R provides the DC f rom MIC-BIAS t o
supply the ECM.
Thanks to the ALC (Automat ic Level control), the
great variations of amplitude will not overmodulate
the transmitter (refer to the chapter on ALC).
The self-adaptative VOX (Voice Operated Trans­mit) offers an a utomatic transmitting with a good
discrimination of the background noise (see the
chapter on VOX).

MIC-BIAS section: microphone bias voltage

The MIC-BIAS bias voltages are dedicated to the
bias of Electret Condenser Microphones. These
bias voltages on pin 10 for TX1 and pin 2 for TX2,
exhibit a low voltage noise density of 22nV/
SQR(Hz). This allows more than 55 dB S/N con­sidering a bandwith of 7 kHz. (see the figure in the

’Electret Condenser Microphone source’ chapter).
The MIC-BIAS voltage is related with VCC as fol­low (with I

V

MIC-BIAS

MIC-BIAS

= 0.844.VCC-0.140 (Volts)

= 2.5 mA):

The ALC features a 20dB gain and an output sig­nal regulated to 700 mVpp in compression.

The attack time is the response time of the ALC to
go from the linear amplification to the compression
region. The attack time mai nly depends on C
capacitor value. A typ ical value of C

is 1µF with

ALC

ALC

music as audio signal (refer to the ’application
schematic’).

The decay time is the response time of the ALC to
recover a full gain amplifying mode from a com­pression mode. The decay time depe nds mainly
on the R

resistor value. A typical value of R

ALC

ALC

is 470k with music as audio signal (refer to the ’ap­plication schematic’).

15/19

TSH512

VOX description: Voice Operated Transmit

The Voice Operated Transmit section (VOX) re­duces consum ption wh en t here is no audio signa l
to transmit. When the VOX detec ts that no audio
signal is present, it mutes the Output Buffers of
TX1 and TX2 and provides the logic signal
VOX-MUTE to switch-off external LED drivers if
needed.

The audio signal of TX1 is amplified with a gain
depending on Rsens an d Csens. Rsens and Cs­ens are connected to pin 7. The high-pass filtering
has the following cut-off frequency:

f

= 1/(2.πR

HPF

sens.Csens

Figure 5 : Vox delay and sensitivity schematic

)

The self-adaptative VOX threshold cons ist in the
constatation that the ambient background noise
variation is slow compared to the voice or the mu­sic. On the pin 28, R

COMP

and C

COMP

integrates
the amplitude to follow the background amplitude.
Therefore, the comparator switches when an au­dio signal appears over the background noise.

Refering to the ’application schematic’, C
be typically a 10 0nF ca pacitor and R

COMP

COMP

will be

will

determined depending on the audio signal.
As soon as an audio is detected, the output of the

monostable switch es to ’high’ state and enab les
both output buffers. The output of the mon os table
is the pin 27 and is called ’VOX-MUTE’.

The monostable holds the TSH512 in transmit
mode during a delay fixed by the v alue of C

TRIG

connected to pin 29

VOX

DELAY

----------- -



5 µA

Ctrig⋅=

1.4 V



Please note that the VOX function is activated with
the audio coming into the first transmitter TX1.

On pin 6, Rpeak and Cpeak integrate the rectified
audio signal with a short time cons tant. This fil­tered signal follows the audio amplitude.

Figure 6 : Vox integrator and monostable
schematic

When the application needs a permanent trans­mission, it is possible to inhib it the VOX function.
Just remove CTRIG cap acitor and connec t pin 29
to ground.

As soon as the TSH512 is powered-on , the inter­nal reset circuitry sets the VOX-MUTE to high
state to enable transmission. The transmission re­mains during the monosta ble timing and con tinue
if an audio signal triggs the monostable

Figure 7 : VOX state at power-on

on

on

on

POWER SUPPLY

POWER SUPPLY

POWER SUPPLY

off

off

off

1

1

VOX-MUTE

VOX-MUTE

VOX-MUTE

1

0

0

0

VOX D elay

VOX D elay

VOX D elay
(Ctrig)

(Ctrig)

(Ctrig)

high state if retriggered by audio

high state if retriggered by audio

high state if retriggered by audio

time

time

time

16/19

TSH512

PEA section: Pre-Emphasis

The amplitude regulated audio coming from the
ALC feeds the postive input of the Operational
Amplifier called PEA (Pre-Emphasis). The
pre-emphasis consist in a high-pass filter in order
to compensate the beha vior of the FM transmis­sion.

Figure 8 : Pre-Emphasis schematic

R

PEA1

and C

set the time constant of the

PEA1

pre-emp hasis as:
τ = R

PEA1

. C

PEA1

50 µs or 75µs time constant are generally used.
Choosing the gain of the PEA stage allows also to
set the right modulation level to the varicap diode.
The gain in the pass-band is:
GPEA = 1+ (R

PEA2/RPEA1

)

VCO section: Voltage Controlled Oscillator

Each TSH512’s transmitter has his own oscillator
to generate the carrier. The audio signal is applied
on the varicap diode to perform the Frequency
Modulation. Thank s t o the V CO-B IAS voltage ref­erence, the DC bias of the varicap is stabilized.
The high PSRR (Power Supply Rejection ratio) of
the VCO-BIAS insure good immunity with the
noise of the power supply.

The generated frequency can be set from 400 kHz
to 11 MHz by external components. Refer to the
table 1 for the usual frequencies in Infrared audio.

The working frequency is:

fVCO

------------------------------------- -

=

1

2 π LCt⋅()⋅⋅

C

is the total capacity of CL, Cp, Cs and Cv.

t

C

= 1/(1 / Cc+1/CL) with Cc = Cp+1/(1/Cv+1/Cs)

t

It’s possible to use varicap diodes SMV1212 (Al­pha Ind.) or ZC833 (Zetex).

Usual Infrared frequencies

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 output level of the VCO can be reduced by
adding the resistor RVCO beetween pin 19 and
pin 20 or beetween pin 36 and pin 37 for TX1 and
TX2 respectively.

Output Buffer section

The output buffers are able t o delive r a sinusoidal
signal with 1.5Vpp amplitud e in a 1K

impedance is compatible with popular bi asing cir­cuitry of external transistor drivers of IR LEDs.

Ω load. This

Figure 9 : VCO schematic

The VOX-MUT E logic signal can be used to con­trol the external LED drivers. When the audio is
not present on the TX1 input, VOX-MUTE is at
’Low’ state, the TSH512’s internal buffers are mut­ed, and external drivers can be switched off by
controlling their bias.

SBY pin: Standby for mono operation

A high state on the S tandby pin (SBY) sets the
second transmitter TX2 in power-down. The SBY
pin is typically used when the TSH512 is used as a
mono transmitter (ie: infrared microphone trans­mitter).

17/19

TSH512

APPLICA TI ON SCHEMATIC

The Electret Condenser Microphone is biased with MIC-BIAS1 voltage. The audio signal is transmitted on
the left channel using a 2.8 MHz carrier. The VOX activates the transmitter TX1 when the audio signal is
present. The audio signal at line level is attenuated and is transmitted by the second transmitter TX2 at

2.3 MHz.

INPUT LINE

INPUT LINE
TX2 (RIGHT)

TX2 (RIGHT)

J7

J7

TX1-LEFT

TX1-LEFT

RCA

RCA

VCC

VCC

A

A

B

B

MICRO

MICRO
MIC1

MIC1

.

.

TX2 = 2.3MHz

TX2 = 2.3MHz

C24

C23

C24

C23

1uF

1uF

2nF2

2nF2

P3

P3

50K

50K

R5

R5

270K

37

37

470nF

470nF

VCC

VCC

100nF

100nF

100nF

100nF

470nF

470nF

C12

C12

VCC

VCC

VCC

VCC

C13

C13
470nF

470nF

470nF

470nF
C14

C14

C7

C7

C6

C6

36

36

C11

C11

270K

R6

R6

47K

47K

R7

R7

100K

100K

34

34

VCO-B235VCO-A2

VCO-B235VCO-A2

BUF-IN2

BUF-IN2

BUF-OUT2

BUF-OUT2

VOX-TIMER

VOX-TIMER

VOX-INTN

VOX-INTN

VOX-MUTE

VOX-MUTE

BUF-OUT1

BUF-OUT1

BUF-IN1

BUF-IN1

22

22

VCC

VCC

R8

R8

100K

100K

47K

47K

R9

R9

R10

R10

270K

270K

R28

R27

R28

R27

1K

33K

1K

33K

100K

100K

R33

R33

C25

C19

1uF

C19

1uF

470K

470K

R31

R31

R35

R35

390

390

390

390

R37

R37

C26

C26
nc

C4

TX2

TX2

ON

ON

OFF

OFF

C4

100nF

100nF

R2

R2
1K

1K

C201uF

C201uF

1

1
2

C5

C5

100nF

100nF

VCC

VCC

VCC

VCC

2
3

3
4

4
5

5
6

6

3K9

3K9

7

7

R25

R25

8

8
9

9

10

10
11

11

C17

C17

1uF

1uF

470nF

470nF

C8

C8

470nF

470nF

C9

C9

470nF

470nF

C10

C10

R1

R1

10K

10K

J20

J20

B

B
A

A

J20

J20

220nF

220nF

C16

C16

R26

R26

33K

33K

1K

1K

R24

R24

nc

44

44

43

43

42

42

LNA-INP2

LNA-INP2

LNA-INN2

LNA-INN2

LNA-OUT2

DEC2

DEC2
MIC-BIAS2

MIC-BIAS2
GND

GND
VCC

VCC
SBY

SBY
VOX-INTS

VOX-INTS
VOX-SENS

VOX-SENS
VCC

VCC
GND

GND
MIC-BIAS1

MIC-BIAS1
DEC1

DEC1

LNA-OUT2

-

­+

+

LNA

LNA

+

+

-

-

LNA

LNA
+

+

-

-

LNA-INP112LNA-INN113LNA-OUT114ALC-INT115PEA-INN116PEA-OUT117VCO-BIAS118VCC19VCO-A120VCO-B121VCO-OUT1

LNA-INP112LNA-INN113LNA-OUT114ALC-INT115PEA-INN116PEA-OUT117VCO-BIAS118VCC19VCO-A120VCO-B121VCO-OUT1

C27

C27

nc

nc

R38

R38

39k

39k

R36

390

R36

390

C21

C21

R32

470k

R32

470k

1uF

1uF

R29

R29

C33

C33

1uF

1uF

1uF

1uF

C18

C18

470pF

470pF

40

40

39

39

41

41

ALC-INT2

ALC-INT2

PEA-INN2

PEA-INN2

PEA-OUT2

PEA-OUT2

-

­+

+

ALC

ALC

PEA

PEA

TSH512

TSH512

VOX

VOX

PEA

PEA

ALC

ALC

+

+

-

-

C221uF

C221uF

C28

C28

470pF

470pF
R34

R34

100K

100K

1K

33K

1K

33K

R30

R30

C34

C34

2nF2

2nF2

C25

51

51

38

38

51

51

P4

P4

50K

50K

R45

R45

VCO-BIAS2

VCO-BIAS2

Monostable

Monostable

R46

R46

SMV1212

SMV1212

39pF

39pF

C35

C35

C39

C39

R43

VCC

R43

VCC

22K

22K

IC?

IC?

33

33

VCO-OUT2

VCO-OUT2

GND

GND

32

32
31

31
30

30

GND

GND

29

29
28

28
27

27

VCC

VCC

26

26

VCC

VCC

25

25
24

24
23

23

GND

GND

TSH512-B

TSH512-B

R44

R44

22K

22K

C42

C42
56pF

56pF

C36

39pF

C36

39pF

D2

D2

C37

C37

56pF

56pF

C45

C45

D1

D1

680pF

680pF

C49

C49
12pF

12pF

L3

L3
120uF

120uF

Reject filter 2.8MHz

C52

C52

22nF

22nF

C53

C53

22nF

22nF

C46

C46
82pF

82pF

C57

C57
10uF

10uF

P5

P5

220K

220K

L4

L4

C32

C32

120uF

120uF

C56

C56

C58

C58
100nF

100nF

L5

L5

nc

nc

Reject filter 2.8MHz

(optional)

(optional)

C55

C55

nc

nc

nc

nc

L6

L6
nc

nc

C59

C59

nc

nc

Reject filter 2.3MHz

Reject filter 2.3MHz

nc

nc

(optional)

(optional)

VCC-LED

VCC-LED

D3

D3
TSFP5400

22

22

VCC-LED

VCC-LED

22

22

R16

R16

R20

R20

TSFP5400

Q1

Q1

BC847

BC847

D4

D4
TSFP5400

TSFP5400

Q2

Q2
BC847

BC847

R13

R13

4K7

4K7

R14

R14

3K3

3K3

R17

R17

4K7

4K7

R18

R18

3K3

3K3

4-25pF

4-25pF

C43

C43
56pF

56pF

56pF

56pF

C40

C40

C15

C15
470nF

470nF

C41

C41

56pF

56pF

C44

C44
56pF

56pF

C38

C38

4-25pF

4-25pF

C50

C50
12pF

12pF

SMV1212

SMV1212

18/19

TX1 = 2.8MHz

TX1 = 2.8MHz

.

.

PACKAGE MECHANICAL DATA
44 PINS - PLASTIC PACKAGE

44 34

1

TSH512

A

A2

e

0,10 mm
.004 inch

33

E3

SEATING PLANE

E

E1

A1

B

11

12 22

D3
D1

D

23

L1

c

L

K

0,25 mm
.010 inch
GAGE PLANE

Dimensions Millimeters Inches

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

A 1.60 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 0.40 0.012 0.015 0.016

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

L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.039

K 0° (min.), 7° (max.)

Information furnished is bel ieved to be accurate and reliable. However, STMicroe lectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No li cense is granted by i mp lica tion or otherwise under a n y patent or patent rig hts of STMicroelectronics. Spec ific at ions
mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information
previously supplied. S TMicroelectronics products are not authorized for use as critica l components in life suppo rt devices or
systems without express written approval of STMicroelectronics.

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19/19