Application information

TSH511

16/25

Figure 23.

Headset side block diagram

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

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

photodiode

Vcc

LED

Vcc

Audio

buffer2

LNA

2.3 MHz

Band-pass

TSH511

HiFi stereo from the PC:

2x 20 mW /16

Ω

1.7 MHz

Band-pass

Voicetransmittedto thePC

Microphone Tx:

1.7 MHz

carrier

Stereo Rx:

2.3 & 2.8 MHz

filter

1.7 MHz

reject

1.7 MHz

reject

2.8 MHz

Band-pass

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

Audio

buffer1

filter

filter

filter

filter

RX2

RX1

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

photodiode

Vcc

LED

Vcc

Audio

buffer2

LNA

2.3 MHz

Band-pass

TSH511

HiFi stereo from the PC:

2x 20 mW /16

Ω

1.7 MHz

Band-pass

Voicetransmittedto thePC

Microphone Tx:

1.7 MHz

carrier

Stereo Rx:

2.3 & 2.8 MHz

filter

1.7 MHz

reject

1.7 MHz

reject

2.8 MHz

Band-pass

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

Audio

buffer1

filter

filter

filter

filter

RX2

RX1

TSH512

LNA + ALC

LNA + ALC

MIC. BIAS

MIC. BIAS

TX2

TX1

VOX

SBY

buffer1

buffer2

photodiode

Vcc

LED

Vcc

Audio

buffer2

LNA

2.3 MHz

Band-pass

TSH511

HiFi stereo from the PC:

2x 20 mW /16

Ω

1.7 MHz

Band-pass

Voicetransmittedto thePC

Microphone Tx:

1.7 MHz

carrier

Stereo Rx:

2.3 & 2.8 MHz

filter

1.7 MHz

reject

1.7 MHz

reject

2.8 MHz

Band-pass

TSH511 & 512 supply:

2.3 to 5.5V, 25 mA

Audio

buffer1

filter

filter

filter

filter

RX2

RX1

LNA + ALC

LNA + ALC

SBY

buffer1

buffer2

LED

photodiode

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

TSH512

Audio

buffer1

Audio

buffer2

LNA

RX2

RX1

filter

TSH511

Vcc

1.7 MHz

Band-pass

HiFi stereo Tx:

2.3 & 2.8 MHz

mono Rx:

1.7 MHz

Voice from the headset microphone

HiFi stereo

VOX

TX2

TX1

LNA + ALC

LNA + ALC

SBY

buffer1

buffer2

LED

photodiode

TSH511 & 512 supply:

2.3 to 5.5V, 24 mA

TSH512

Audio

buffer1

Audio

buffer2

LNA

RX2

RX1

filter

TSH511

Vcc

1.7 MHz

Band-pass

HiFi stereo Tx:

2.3 & 2.8 MHz

mono Rx:

1.7 MHz

Voice from the headset microphone

HiFi stereo

VOX

TX2

TX1