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G1428

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become small, the cut-off frequency will be larger and

degraded the bass-band performance. The other side

effect is with extra power dissipation through the ex-

ternal resistor R to the ground. So using the external

resistor R to flatting the variation of the cut-off fre-

quency, the user must also consider the bass-band

performance and the extra power dissipation to

choose the accepted external resistor R value.

Power Supply Decoupling

The G1428 is a high-performance CMOS audio ampli-

fier that requires adequate power supply decoupling to

make sure the output total harmonic distortion (THD)

as low as possible. The optimum decoupling is using

two capacitors with different types that target different

types of noise on the power supply leads. For high

frequency transients, spikes, a good low ESR ceramic

capacitor works best, typically 0.1µF/1µF used and

placed as close as possible to the G1428 VDD lead. A

larger aluminum electrolytic capacitor of 10uF or

greater placed near the device power is recommended

for filtering low-frequency noise.

Optimizing DEPOP Operation

Input Signal

Circuitry has been implemented in G1428 to mini-

mize the amount of popping heard at power-up and

when coming out of shutdown mode. Popping oc-

curs whenever a voltage step is applied to the

speaker and making the differential voltage gener-

ated at the two ends of the speaker. To avoid the

popping heard, the bypass capacitor should be

chosen promptly, 1/(C

x170kΩ)

≦

1/(C

*(R

)).

Figure 1

Ver: 1.2

Mar 31, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

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