AD8284

Data Sheet

Rev. D | Page 8 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Figure 3. Pin Configuration

Table 6. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

NC

No Connection. Tie NC to any potential.

2

SFLAG

Saturation Flag.

3

PDWN

Full Power-Down. A logic high on PDWN overrides the SPI and powers down the part; a logic low allows

selection through the SPI.

4

DVDD18

1.8 V Digital Supply.

5

SCLK

Serial Clock.

6

CS

Chip Select.

7

SDI

Serial Data Input.

8

SDO

Serial Data Output.

9

AUX

Auxiliary Channel. A logic high on AUX switches the AUX channel to ADC (INADC+/INADC−).

10

MUX[0]

Digital Control for Mux Channel Selection.

11

MUX[1]

Digital Control for Mux Channel Selection.

12

ZSEL

Input Impedance Select. A logic high on ZSEL overrides the SPI and sets the input impedance to 200 kΩ; a

logic low allows selection through the SPI.

13

TEST1

Test. Do not use the TEST1 pin; tie TEST1 to ground.

14

TEST2

Test. Do not use the TEST2 pin; tie TEST2 to ground.

15

DVDD33SPI

3.3 V Digital Supply, SPI Port.

16

NC

No Connection. Tie NC to any potential.

17

NC

No Connection. Tie NC to any potential.

18

AVDD18

1.8 V Analog Supply.

19

AVDD33

3.3 V Analog Supply.

20

INA+

Positive Mux Analog Input for Channel A.

21

INA−

Negative Mux Analog Input for Channel A.

22

INB+

Positive Mux Analog Input for Channel B.

23

INB−

Negative Mux Analog Input for Channel B.

PIN 1

AD8284

TOP VIEW

(Not to Scale)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19 20

21 22 23 24 25 26 27 28

29 30 31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

NC

SFLAG

PDWN

DVDD18

SCLK

SDI

SDO

CS

AUX

MUX[0]

MUX[1]

ZSEL

TEST1

TEST2

DVDD33SPI

NC

NC

AGND

AVDD18ADC

TEST3

ANOUT

APOUT

RBIAS

VREF

BAND

AVDD33REF

DVDD33CLK

CLK–

CLK+

DVDD18CLK

TEST4

NC

NOTES

1. TIE THE EXPOSED PAD ON THE BOTTOM SIDE TO THE ANALOG GROUND PLANE.

2. NC = NO CONNECTION. TIE NC TO ANY POTENTIAL.