Data Sheet

AD9681

Rev. A | Page 13 of 40

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

VIN–D1

VIN+D1

NC

VIN–C2

NC

VIN–C1

NC

NC

VIN–B2

NC

VIN+B1

VIN–B1

NC

NC

NC

VIN+C2

NC

VIN+C1

NC

NC

VIN+B2

NC

NC

NC

VIN–D2

VIN+D2

SYNC

VCM1

VCM2

VREF

SENSE

RBIAS1

RBIAS2

GND

VIN+A2

VIN–A2

GND

GND

GND

AVDD

AVDD

AVDD

AVDD

AVDD

AVDD

GND

NC

NC

CLK–

CLK+

GND

AVDD

GND

GND

GND

GND

AVDD

CSB1

VIN+A1

VIN–A1

GND

GND

GND

AVDD

GND

GND

GND

GND

AVDD

CSB2

SDIO/OLM SCLK/DTP

D1–D2

D1+D2

GND

AVDD

GND

GND

GND

GND

AVDD

PDWN

D0+A1

D0–A1

D0–D2

D0+D2

GND

AVDD

GND

GND

GND

GND

AVDD

GND

D1+A1

D1–A1

D1–D1

D1+D1

GND

AVDD

AVDD

AVDD

AVDD

AVDD

AVDD

GND

D0+A2

D0–A2

D0–D1

D0+D1

DRVDD

DRVDD

GND

GND

GND

GND

DRVDD

DRVDD

D1+A2

D1–A2

D1–C2

D1+C2

D1+C1

D0+C1

FCO+1

DCO+1

DCO+2

FCO+2

D1+B2

D0+B2

D0+B1

D0–B1

D0–C2

D0+C2

D1–C1

D0–C1

FCO–1

DCO–1

DCO–2

FCO–2

D1–B2

D0–B2

D1+B1

D1–B1

A

B

C

D

E

F

G

H

J

K

L

M

12

34

56

78

9

10

11

12

AD9681

TOP VIEW

(Not to Scale)

NOTES

1. NC = NO CONNECT. THESE PINS ARE NOT ELECTRICALLY CONNECTED TO THE DEVICE. HOWEVER, CONNECT THESE PINS TO BOARD

GROUND WHERE POSSIBLE.

Figure 10. Pin Configuration

Table 8. Pin Function Descriptions

Pin No.

Mnemonic

Description

A3, A5, A7, A8, A10,

B1 to B3, B5, B7, B8,

B10 to B12, D11, D12

NC

No Connect. These pins are not electrically connected to the device. However, connect these

pins to board ground where possible.

C10, D1 to D3, D10,

E3, E5 to E8, F1 to F3,

F5 to F8, G3, G5 to G8,

H3, H5 to H8, H10, J3,

J10, K5 to K8

GND

Ground.

D4 to D9, E4, E9, F4,

F9, G4, G9, H4, H9,

J4 to J9

AVDD

1.8 V Analog Supply.

K3, K4, K9, K10

DRVDD

1.8 V Digital Output Driver Supply.

E1, E2

CLK−, CLK+

Input Clock Complement, Input Clock True.