Datasheet > AN6215S

AN6215S

更新时间： 2024-02-22 22:52:01

品牌	Logo	应用领域
松下 - PANASONIC		电话
页数	文件大小	规格书
5页	58K
描述
AGC IC for telephone speech network

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数据手册

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AN6215S 数据手册

ICs for Telephone

AN6215S

■ 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.

Microphone

Speech amp.

Microphone

amp.

Circuit

I/F

VCSW

V_CC

Det.

VCSW: V_REFcontrol switch

SW on: V_REF= 2.0 V

SW off: V_REF= 1.15 V

V_REF

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

GND

Receiver amp.

• Characteristics

RX out

Inclination: ∆R = − 0.6 dB/dB

∆Gain = − 8 dB

(R2 = 68 kΩ)

TX in

−39 dBm

(R1 = 10 kΩ)

Figure 1. Variable width of attenuation

Figure 2. Operating point of attenuation

V_REF(V)

2.0

V_RB(Base-set mode)

1.15

0.3

V_RH(Hand-set mode)

V_DETReference voltage

V_CC

Figure 3. Operation of variable V_REFcircuit

1 2 3 45

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