AD9694 datasheet(12/101 Pages) AD

12 / 101 page

AD9694

Data Sheet

Rev. 0 | Page 12 of 101

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NOTES

1. EXPOSED PAD. ANALOG GROUND. THE EXPOSED THERMAL PAD ON THE BOTTOM OF THE PACKAGE

PROVIDES THE GROUND REFERENCE FOR AVDDx, SPIVDD, DVDD, DRVDD1, AND DRVDD2.

THIS EXPOSED PAD MUST BE CONNECTED TO GROUND FOR PROPER OPERATION.

AVDD3

VIN–A

VIN+A

AVDD2

AVDD3

VIN+B

VIN–B

AVDD2

AVDD1

VCM_AB

DVDD

DGND

DRVDD2

PDWN/STBY

FD_A

FD_B

AVDD3

VIN–C

VIN+C

AVDD2

AVDD3

VIN+D

VIN–D

AVDD2

AVDD1

VCM_CD/VREF

DVDD

DGND

SPIVDD

CSB

SCLK

SDIO

AD9694

TOP VIEW

(Not to Scale)

Figure 5. Pin Configuration (Top View)

Table 10. Pin Function Descriptions

Pin No.

Mnemonic

Type

Description

AGND/EPAD

Ground

Exposed Pad. Analog Ground. The exposed thermal pad on

the bottom of the package provides the ground reference for

AVDDx, SPIVDD, DVDD, DRVDD1, and DRVDD2. This exposed

pad must be connected to ground for proper operation.

1, 6, 49, 54

AVDD3

Supply

Analog Power Supply (2.5 V Nominal).

2, 3

VIN−A, VIN+A

Input

ADC A Analog Input Complement/True.

4, 5, 9, 46, 50, 51, 55, 72

AVDD2

Supply

Analog Power Supply (1.8 V Nominal).

7, 8

VIN+B, VIN−B

Input

ADC B Analog Input True/Complement.

10, 11, 44, 45, 56, 57, 58, 59,

62, 68, 69, 70, 71

AVDD1

Supply

Analog Power Supply (0.975 V Nominal).

VCM_AB

Output

Common-Mode Level Bias Output for Analog Input Channel A

and Channel B.

13, 42

DVDD

Supply

Digital Power Supply (0.975 V Nominal).

14, 41

DGND

Ground

Ground Reference for DVDD and SPIVDD.

DRVDD2

Supply

Digital Power Supply for JESD204B PLL (1.8 V Nominal).

PDWN/STBY

Input

Power-Down Input (Active High). The operation of this pin

depends on the SPI mode and can be configured as power-

down or standby. Requires external 10 kΩ pull-down resistor.

17, 18, 35, 36

FD_A, FD_B, FD_D, FD_C

Output

Fast Detect Outputs for Channel A, Channel B, Channel C, and

Channel D.

SYNCINB−AB

Input

Active Low JESD204B LVDS Sync Input Complement for

Channel A and Channel B.

SYNCINB+AB

Input

Active Low JESD204B LVDS/CMOS Sync Input True for Channel A

and Channel B.

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