W6662CF 데이터 시트보기 (PDF) - Winbond

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W6662CF

SCANNER ANALOG FRONT END

Winbond 

Preliminary W6662CF

8.2. Decoupling Circuit

Figure 8-2 shows the decoupling capacitor request on the W6662 system board to reduce noise and

distortion, 0.1 µF capacitor must as near to the pin as possible. The analog power source and digital

power source (DRVDD) had better regulated by different regulator, the analog ground and digital

ground (DRVSS) must separated and must connected only at one point near the power supplier. All

the analog power pins must connected as short as possible and all the analog ground pins must

connected as short as possible on the PC board. Termination resistor must added near the W6662

chip on the CDSCK1, CDSCK2 and ADCCLK input pin.

10uF +

0.1uF

0.1uF

0.1uF

0.1uF

1uF +

0.1uF

0.1uF

AVDD

10uF +

0.1uF

(Analog Part)

VRDT

(Digital Part)

VRDT

VDRB

W6662

CDSCK1

(other pins are not shown)

VRDB

VRDC

CDSCK2

VREF

ADCCLK

CISREF

AVDD

AVSS

(near power source)

DRVDD

DRVSS

Rterm

Rterm

Rterm

0.1uF

DRVDD

+ 10uF

Fig. 8-2 Decoupling Capacitor Circuit of W6662 Device.

- 17 -

Publication Release Date: December 1998

Revision A1

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