AD9266

Data Sheet

Rev. A | Page 10 of 32

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NOTES

2. THE EXPOSED PADDLE (PIN 0) IS THE ONLY GND

CONNECTION ON THE CHIP AND MUST BE CONNECTED

TO THE PCB AGND.

CLK+

CLK–

AVDD

CSB

SCLK/DFS

SDIO/PDWN

NC

NC

AVDD

MODE/OR

DCO

(MSB) D15_D14

D13_D12

D11_D10

D9_D8

D7_D6

TOP VIEW

(Not to Scale)

AD9266

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

Figure 3. Pin Configuration

Table 8. Pin Function Descriptions

Pin No.

Mnemonic

Description

0, Exposed Paddle

AGND

The exposed paddle is the only ground connection on the chip. It must be soldered to the analog

ground of the PCB to ensure proper functionality and heat dissipation, noise, and mechanical strength

benefits.

1, 2

CLK+, CLK−

Differential Encode Clock for PECL, LVDS, or 1.8 V CMOS Inputs.

3, 24, 29, 32

AVDD

1.8 V Supply Pin for ADC Core Domain.

4

CSB

SPI Chip Select. Active low enable, 30 kΩ internal pull-up.

5

SCLK/DFS

SPI Clock Input in SPI Mode (SCLK). 30 kΩ internal pull-down.

Data Format Select in Non-SPI Mode (DFS). Static control of data output format. 30 kΩ internal pull-down.

DFS high = twos complement output; DFS low = offset binary output.

6

SDIO/PDWN

SPI Data Input/Output (SDIO). Bidirectional SPI data I/O with 30 kΩ internal pull-down.

Non-SPI Mode Power-Down (PDWN). Static control of chip power-down with 30 kΩ internal pull-

down. See Table 14 for details.

7 to 12

NC

No Connect.

14 to 21

D1_D0 (LSB) to

(MSB) D15_D14

ADC Digital Outputs.

13

DRVDD

1.8 V to 3.3 V Supply Pin for Output Driver Domain.

22

DCO

Data Clock Digital Output.

23

MODE/OR

Chip Mode Select Input (MODE)/Out-of-Range Digital Output in SPI Mode (OR).

Default = out-of-range (OR) digital output (SPI Register 0x2A, Bit 0 = 1).

Option = chip mode select input (SPI Register 0x2A, Bit 0 = 0).

Chip power-down (SPI Register 0x08, Bits[7:5] = 100b).

Chip standby (SPI Register 0x08, Bits[7:5] = 101b).

Normal operation, output disabled (SPI Register 0x08, Bits[7:5] = 110b).

Normal operation, output enabled (SPI Register 0x08, Bits[7:5] = 111b).

Out-of-range (OR) digital output only in non-SPI mode.

25

VREF

1.0 V Voltage Reference Input/Output. See Table 10.

26

SENSE

Reference Mode Selection. See Table 10.

27

VCM

Analog Output Voltage at Mid AVDD Supply. Sets common mode of the analog inputs.

28

RBIAS

Set Analog Current Bias. Connect to 10 kΩ (1% tolerance) resistor to ground.

30, 31

VIN−, VIN+

ADC Analog Inputs.