TS34118_1 Datasheet, PDF (1/23 Pages) Taiwan Semiconductor Company, Ltd – Voice Switched Speakerphone Circuit

TS34118
Voice Switched Speakerphone Circuit
SOP-28
DIP-28
Pin Definition:
1. FO
8. TXO
2. FI
9. TXI
3. CD
10. MCO
4. Vcc 11. MCI
5. HTO+ 12. MUT
6. HTO- 13. VLC
7. HTI
14. C_T
15. VB
16. CPT
17. TLI2
18. TLO2
19. RLO2

20. RLI2
21. RXI

22. Gnd
23. TLI1
24. TLO1

25. RLO1
26. RLI1
27. CPR
28. GND
General Description
The TS34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level
detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system. Included are a
microphone amplifier with adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a
complementary manner, level detectors at both input and output of both attenuators, and background noise monitors
for both the transmit and receive channels. A Dial Tone Detector prevents the dial being attenuated by the Receive
background noise monitor circuit. Also included are two line drive amplifiers which can be used to form a hybrid
network in conjunction with an external coupling transformer. A high-pass filter can be used to filter out 60Hz noise in
the receive channel, or for other filtering functions .A Chip Disable pin permits powering down the entire circuit to
conserve power on long loops where loop current is at a minimum.
The TS34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically
5.0mA. The TS34118 can be interfaced directly to Tip and Ring (through a coupling transformer) for stand-alone
operation, or it can be used in conjunction with a handset speech network and/or other features of a feature phone
Features
● Improved attenuator gain range: 52dB between
transmit and receive.
● Low voltage operation for line-power application
(3V~6.5V).
● 4-point signal sensing for improved sensitivity
● Back ground noise monitors for both transmit and
receive paths.
● Compatible with TS34119 speaker amplifier.
● Microphone amplifier gain set by external resistors-
mute function included.
● Chip disable for active/standby operation.
Ordering Information
Part No.
TS34118CS28 C8

^{TS34118CD28 C4}
Package
SOP-28

DIP-28

Packing
25pcs / Tube
10pcs / Tube
Absolute Maximum Rating
Description
Supply voltage (pin 4)

Voltage at CD (pin 3), MUT (pin 12)
Voltage at VLC (pin 13)
Voltage at TXI (pin 9),RXI (pin 21),FI(pin 2)
Storage temperature range
Value
-1.0, +7.0
-1.0,Vcc +1.0
-1.0,Vcc +0.5
-0.5,Vcc +0.5
-65 to +150
Unit
V
V
V
V
ºC





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Version: A08