AD9642 datasheet(10/29 Pages) AD

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Data Sheet

AD9642

Rev. B | Page 9 of 28

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

24 CSB

23 SCLK

22 SDIO

21 DCO+

20 DCO–

19 D12+/D13+ (MSB)

18 D12–/D13– (MSB)

17 DRVDD

CLK+

CLK–

AVDD

D0–/D1– (LSB)

D0+/D1+ (LSB)

D2–/D3–

D2+/D3+

DRVDD

AD9642

INTERLEAVED

LVDS

TOP VIEW

(Not to Scale)

NOTES

1. THE EXPOSED THERMAL PADDLE ON THE BOTTOM OF THE

PACKAGE PROVIDES THE ANALOG GROUND FOR THE

PART. THIS EXPOSED PADDLE MUST BE CONNECTED TO

GROUND FOR PROPER OPERATION.

2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.

Figure 3. LFCSP Pin Configuration (Top View)

Table 8. Pin Function Descriptions

Pin No.

Mnemonic

Type

Description

ADC Power Supplies

8, 17

DRVDD

Supply

Digital Output Driver Supply (1.8 V Nominal).

3, 27, 28, 31, 32

AVDD

Supply

Analog Power Supply (1.8 V Nominal).

AGND,

Exposed Paddle

Ground

Analog Ground. The exposed thermal paddle on the bottom of the package provides

the analog ground for the part. This exposed paddle must be connected to ground for

proper operation.

DNC

Do Not Connect. Do not connect to this pin.

ADC Analog

VIN+

Input

Differential Analog Input Pin (+).

VIN−

Input

Differential Analog Input Pin (−).

VCM

Output

Common-Mode Level Bias Output for Analog Inputs.

This pin should be decoupled

to ground using a 0.1 μF capacitor.

CLK+

Input

ADC Clock Input—True.

CLK−

Input

ADC Clock Input—Complement.

Digital Outputs

D0+/D1+ (LSB)

Output

DDR LVDS Output Data 0/1—True.

D0−/D1− (LSB)

Output

DDR LVDS Output Data 0/1—Complement.

D2+/D3+

Output

DDR LVDS Output Data 2/3—True.

D2−/D3−

Output

DDR LVDS Output Data 2/3—Complement.

D4+/D5+

Output

DDR LVDS Output Data 4/5—True.

D4−/D5−

Output

DDR LVDS Output Data 4/5—Complement.

D6+/D7+

Output

DDR LVDS Output Data 6/7—True.

D6−/D7−

Output

DDR LVDS Output Data 6/7—Complement.

D8+/D9+

Output

DDR LVDS Output Data 8/9—True.

D8−/D9−

Output

DDR LVDS Output Data 8/9—Complement.

D10+/D11+

Output

DDR LVDS Output Data 10/11—True.

D10−/D11−

Output

DDR LVDS Output Data 10/11—Complement.

D12+/D13+ (MSB)

Output

DDR LVDS Output Data 12/13—True.

D12−/D13− (MSB)

Output

DDR LVDS Output Data 12/13—Complement.

DCO+

Output

LVDS Data Clock Output—True.

DCO−

Output

LVDS Data Clock Output—Complement.

SPI Control

SCLK

Input

SPI Serial Clock.

SDIO

Input/output

SPI Serial Data I/O.

CSB

Input

SPI Chip Select (Active Low).

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