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CXD2309AQ

10-bit 85MSPS 3-Channel D/A Converter

Sony Semiconductor 

CXD2309AQ

Latch Up Prevention

The CXD2309AQ is a CMOS IC which requires latch up precausions. Latch up is mainly generated by the lag

in the voltage rising time of AVDD (Pin 39, 40 and 41) and DVDD (Pin 48), when power supply is ON.

1. Correct usage

a. When analog and digital supplies are from different sources

AVDD

DVDD

39 40 41

AVDD

48

DVDD

+5V

+5V

C

CXD2309AQ

C

DIGITAL IC

AVSS

AVSS

43 45 47

DVSS

34

b. When analog and digital supplies are from a common source

(i)

DVDD

+5V

C

AVSS

39 40 41

AVDD

48

DVDD

CXD2309AQ

C

AVSS

43 45 47

DVSS

34

DIGITAL IC

(ii)

DVDD

+5V

C

AVSS

39 40 41

AVDD

48

DVDD

CXD2309AQ

C

AVSS

43 45 47

DVSS

34

– 11 –

DIGITAL IC

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