AD1938YSTZ datasheet(11/33 Pages) AD

Part #	AD1938YSTZ

Description	4 ADC/8 DAC with PLL

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AD1938

Data Sheet

Rev. E | Page 10 of 32

Pin No.

In/Out

Mnemonic

Description

26

I

CCLK

Control Clock Input (SPI).

27

I

CLATCH

Latch Input for Control Data (SPI).

28

O

OL1

DAC 1 Left Output.

29

O

OR1

DAC 1 Right Output.

30

O

OL2

DAC 2 Left Output.

31

O

OR2

DAC 2 Right Output.

32

I

AGND

Analog Ground.

33

I

AVDD

Analog Power Supply. Connect to analog 3.3 V supply.

34

I

AGND

Analog Ground.

35

O

FILTR

Voltage Reference Filter Capacitor Connection. Bypass with 10 µF||100 nF to AGND.

36

I

AGND

Analog Ground.

37

I

AVDD

Analog Power Supply. Connect to analog 3.3 V supply.

38

O

CM

Common-Mode Reference Filter Capacitor Connection. Bypass with 47 µF||100 nF to AGND.

39

I

ADC1LP

ADC1 Left Positive Input.

40

I

ADC1LN

ADC1 Left Negative Input.

41

I

ADC1RP

ADC1 Right Positive Input.

42

I

ADC1RN

ADC1 Right Negative Input.

43

I

ADC2LP

ADC2 Left Positive Input.

44

I

ADC2LN

ADC2 Left Negative Input.

45

I

ADC2RP

ADC2 Right Positive Input.

46

I

ADC2RN

ADC2 Right Negative Input.

47

O

LF

PLL Loop Filter, Return to AVDD.

48

I

AVDD

Analog Power Supply. Connect to analog 3.3 V supply.

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