STLC7550TQFP 查看數據表（PDF） - STMicroelectronics

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STLC7550TQFP

LOW POWER LOW VOLTAGE ANALOG FRONT END

STMicroelectronics 

STLC7550

TYPICAL APPLICATION

Line Interface - Differential Duplexor

Figure 10

22kW

13.2kW

22kW

OUT+

OUT-

IN+

680pF

13.2kW

22kW

22kW

1.2kW

2.2nF

R'

VCM

r

2.2nF

C'

100pF

C : Improve the low frequency response.

Its value depends on the transformer inductance.

C' : Reduces the DC offset gain.

Z0 : Nominal line impedance

Z0/2

VCM

C

2R

Z0/2

Phone

Line

C

100pF

2R

R

R'

1.2kW

R

IN-

All capacitor, resistor and impedance values are provided for indication only. These values must be

readjusted according to line transformer characteristics and also telecommunication regulations in force in

individual countries.

Refer to Application Note AN930 for more detailed information. Contact your local representative.

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