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SL34118

Voice Switched Speakerphone Circuit

System Logic Semiconductor 

SL34118

ELECTRICAL CHARACTERISTICS(TA = -25 to +70°C, VCC = 5.0 V , CD = 0.8 V, unless noted)

Guaranteed

Symbol

Parameter

Test Conditions

Limits

Unit

Min Max

∆VRXO

VRXOH

∆RXO DC Voltage

RXO High Voltage

VRXOL RXO Low Voltage

RRXI

GTX

GTXI

∆GTXI*

RXI Input Resistance

Trasmit Attenuator Gain

( f =1.0 KHz)

Rx to Tx Mode

IOUT= -1.0 mA,RXI=VB+1.5V,

VCT=2.6 V

IOUT= +1.0 mA,RXI=VB-1.0V,

VCT=2.6 V

Output measured with respect to

VB

RXI=350 mVrms, f = 1.0 KHz

Tx Mode, TXI=150 mVrms

Idle Mode, RXI=-150 mVrms

Range (Tx to Rx Mode)

-

±190 mV

2.8

-

V

-

VB-0.75 V

5.25

17.5

kΩ

1.5

10.0

dB

-25

-15

49

54

∆VTXO

VTXOH

∆TXO DC Voltage

TXO High Voltage

VTXOL TXO Low Voltage

RTXI TXI Input Resistance

ATTENUATOR CONTROL

Tx to Rx Mode

IOUT= -1.0 mA,TXI=VB+1.5V,

VCT=1.6 V

IOUT= +1.0 mA,TXI=VB-1.0V,

VCT=1.6 V

Output measured with respect to

VB

TXI=350 mVrms, f = 1.0 KHz

ICTR

CT Source Current (switching f = 1 KHz, VLC = VB =CT

to Rx mode)

ICTT

CT Sink Current (switching to f = 1 KHz, VLC = VB =CT

Tx mode)

RFI*

CT Fast Idle Internal

Resistance

VDT* Dial Tone Detector Threshold

MICROPHONE AMLIFIER (VMUT ≤ 0.8 V, A+ = 31 dB, unless otherwise noted)

MCOVOS Output Offset

VMCO - VB,

Freedback R= 180 KΩ

AVOLM

VMCOH

VMCOL

GMT

Open Loop Gain

Output High Voltage

Output LowVoltage

Muting (∆Gain)

RMUT

VMUTH

VMUTL

MUT Input Resistance

MUT Input-High

MUT Input-Low

f = 100 Hz

IOUT=-1.0 mA ,VMCI=VB+1.5 V

IOUT=1.0 mA, VMCI=VB - 1.0 V

f = 1.0 Khz,VMCI = 150 mV

0.8 V ≤ VMUT ≤ 2.0 V

VCC = VMUT = 6.5 V

-

±190 mV

2.8

-

V

-

VB-0.75 V

5.25

17.5

KΩ

-106

-30

µA

+30

+106

µA

1.5

3.6

KΩ

10

20

mV

-62

+62

mV

60

-

dB

2.8

-

V

-

250

mV

52

-

dB

37.5

-

KΩ

2.0

VCC

V

0

0.8

V

(continued)

SLS

System Logic

Semiconductor

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