AD8285

Data Sheet

Rev. B | Page 8 of 27

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Figure 3. Pin Configuration

Table 6. Pin Function Descriptions

Pin No.

Mnemonic

Description

0

EPAD

Exposed Pad. Tie the exposed pad on the bottom of the package to the analog/digital ground plane.

1

NC

No Connect. Do not connect to this pin.

2

DSYNC

Data Output Synchronization.

3

PDWN

Full Power Down. Logic high overrides the SPI and powers down the device. Logic low allows selection of

the power down option through the SPI.

4

DVDD18

1.8 V Digital Supply.

5

SCLK

Serial Clock.

6

SDIO

Serial Data Input/Output.

7

CS

Chip Select Bar.

8

AUX

Auxiliary. A logic high on AUX switches the AUX channel (INADC+/INADC−) to the ADC. The AUX pin has a

higher priority than the MUXA pin.

9

MUXA

Channel A Select. Logic high forces to Channel A unless AUX is asserted.

10

ZSEL

Input Impedance Select. Logic high overrides the SPI and sets the input impedance to 200 kΩ. Logic low

allows selection of the input impedance through the SPI.

11

TEST1

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

12

TEST2

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

13

DVDD33SPI

3.3 V Digital Supply for SPI Port.

14

AVDD18

1.8 V Analog Supply.

15

AVDD33A

3.3 V Analog Supply for Channel A.

16

INA−

Negative LNA Analog Input for Channel A.

17

INA+

Positive LNA Analog Input for Channel A.

18

NC

No Connect. Do not connect to this pin.

19

NC

No Connect. Do not connect to this pin.

20

NC

No Connect. Do not connect to this pin.

21

AVDD33B

3.3 V Analog Supply for Channel B.

22

INB−

Negative LNA Analog Input for Channel B.

23

INB+

Positive LNA Analog Input for Channel B.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

NC

DSYNC

PDWN

DVDD18

SCLK

SDIO

CS

AUX

MUXA

ZSEL

TEST1

TEST2

DVDD33SPI

AVDD18

AVDD33A

INA–

17

INA+

18

NC

54

53

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

NC

TEST4

DVDD18CLK

CLK+

CLK–

DVDD33CLK

AVDD33REF

VREF

RBIAS

BAND

APOUT

ANOUT

TEST3

AVDD18ADC

AVDD18

INADC+

INADC–

NC

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

2. TIE THE EXPOSED PAD ON THE BOTTOM OF THE PACKAGE TO THE ANALOG/DIGITAL GROUND PLANE.

PIN 1

INDICATOR

AD8285

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