AN6215S データシートの表示（PDF） - Panasonic Corporation

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AN6215S

AGC IC for telephone speech network

Panasonic Corporation 

ICs for Telephone

AN6215S

s Application Circuit Example

• System configuration

• Detects input of microphone and gives attenuation to a receiver system

• Operating point and variable width of attenuator can be set with external resistor respectively.

T

Circuit

R I/F

Speech amp.

Microphone

amp.

C4

Microphone

VCSW

VCC

R1

R3

C3

• Characteristics

RX out

Det.

VREF

CC

GND

R2

C1

Receiver amp.

BN

VCSW: VREF control switch

SW on: VREF = 2.0 V

SW off: VREF = 1.15 V

Buff

R1: Detection circuit gain adjustment resistor

R2: Receiver ∆Gain width adjustment resistor

R3, C3: Resistor and capacitor to determine

attack-recovery time of transmitter

C2

Receiver amp.

∆Gain = − 8 dB

(R2 = 68 kΩ)

RX out

Inclination: ∆R = − 0.6 dB/dB

TX in

Figure 1. Variable width of attenuation

−39 dBm

(R1 = 10 kΩ)

TX in

Figure 2. Operating point of attenuation

VREF (V)

2.0

VRB (Base-set mode)

1.15

VRH (Hand-set mode)

0.3

VDET Reference voltage

VCC

Figure 3. Operation of variable VREF circuit

5

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