TS34118CS28 datasheet(5/20 Pages) TSC

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TS34118CS28

Taiwan Semiconductor

Version: E1608

ORDERING INFORMATION

PART NO.

PACKAGE

PACKING

TS34118CS28 RDG

SOP-28

1,500pcs / 13”Reel

PIN DESCRIPTION

PIN NO.

NAME

FUNCTION

Filter output. Output impedance is less than 50Ω

Filter input. Input impedance is greater than 1MΩ.

Chip Disable. A logic low (<0.8V) sets normal operation. A logic high (>2.0V)

disables the IC to conserve power. Input impedance is nominally 90kΩ.

VCC

A supply voltage of +2.8V to +6.5V is required, at ≈ 5.0mA. As VCC falls from 3.5V to

2.8V, an AGC circuit reduces the receive attenuator gain by ≈25dB (when in the

receive mode).

HTO+

Output of the second hybrid amplifier. The gain is internally set at –1.0 to provide a

differential output, in conjunction with HTO-, to the hybrid transformer.

HTO-

Output of the first hybrid amplifier. The gain of the amp is set by external resistors.

HTI

Input and summing node for the first hybrid amplifier. DC level is ≈ VB.

TXO

Output of the transmit attenuator. DC level is approximately VB.

TXI

Input to the transmit attenuator. Max. Signal level is 350mVrms. Input impedance is

10kΩ.

MCO

Output of the microphone amplifier. The gain of the amplifier is set by external

resistors.

MCI

Input and summing node of the microphone amplifier. DC level is≈ VB.

MUT

Mute input. A logic low (<0.8V) sets normal operation. A logic high (>2.0V) mutes

the microphone amplifier without affecting the rest of the circuit. Input impedance is

nominally 90kΩ.

VCI

Volume control input. When VCI=VB, the receive attenuator is at maximum gain

when in the receive mode. When VCI=0.3VB, the receive gain is down 35dB. Does

not affect the transmit mode.

An RC at this pin sets the response time for the circuit to switch modes.

An output voltage ≈ VCC/2. This voltage is a system ac ground, and biases the

volume control. A filter cap is required

CPT

An RC at this pin sets the time constant for the transmit background monitor.

TLI2

Transmit level detector on the mike/speaker side.

TLO2

Transmit level detector on the mike/speaker side, and input to the transmit

background monitor.

RLO2

Receive level detector on the mike/speaker side.

RLI2

Receive level detector on the mike/speaker side.

RXI

Input to the receive attenuator and dial tone detector. Max input level is 350mVrms.

Input impedance is ≈10kΩ.

RXO

Receive attenuator. DC level is approximately VB.

TLI1

Transmit level detector on the line side.

TLO1

Transmit level detector on the line side.

RLO1

Receive level detector on the line side, and input to the receive background monitor.

RLI1

Receive level detector on the line side.

CPR

An RC at this pin sets the time constant for the receive background monitor.

GND

Ground pin for the entire IC.

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