PA3428G-N24-R datasheet(4/9 Pages) UTC

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PA3428

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 9

www.unisonic.com.tw

QW-R502-242.A

APPLICATION INFORMATION

Shutdown Mode Operating

INPUT

AMPLIFIER

HP/LINE

SE/BTL

SHUTDOWN

INPUT

OUTPUT

MUTE

LINE

BTL

LINE

HEADPHONE

BTL

HEADPHONE

X: Ignore

L: Low

H: High

CI (Input Capacitor)

The value of CI is important to consider as it directly affects the bass performance of the application circuit. When CI is

required to allow the amplifier to bias the input signal to the proper dc level for optimum operation, it’s value can be

calculate by this equation:

CI=1/ (2πRIFC)

RI: Input Impedance

FC: High-pass Filter’s Frequency

The low leakage tantalum or ceramic capacitors are suggested to be used as the input coupling capacitors, because

of the small leakage current of the input ca-pacitors will cause the dc offset voltage at the input to the amplifier that

reduces the operation headroom, especially at the high gain applications. It is important to let the positive side

connecting to the higher dc level of the application when using the polarized capacitors.

Gain setting (Vs Gain0, Gain1 and RI, SE/BTL)

Gain setting is determined by GAIN0 and GAIN1. The gains listed in the next table are realized by changing the taps

on the input resistors inside the amplifier which will cause the internal input impedance(R I) to be dependent on the

gain setting as we can see listed in the next table.

AV(V/V)

GAIN0

GAIN1

SE/BTL

R I(kΩ)

X: Ignore

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