AD6655 datasheet(19/84 Pages) AD

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AD6655

Rev. 0 | Page 19 of 84

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

DRVDD

D6B

D7B

D8B

D9B

D10B

D11B

D12B

D13B (MSB)

DCOB

DCOA

D0A (LSB)

D1A

D2A

D3A

D4A

SCLK/DFS

SDIO/DCS

AVDD

VIN+B

VIN–B

RBIAS

CML

SENSE

VREF

VIN–A

VIN+A

AVDD

SMI SDFS

SMI SCLK/PDWN

SMI SDO/OEB

PIN 1

INDICATOR

AD6655

PARALLEL CMOS

TOP VIEW

(Not to Scale)

EXPOSED PADDLE, PIN 0

(BOTTOM OF PACKAGE)

Figure 9. LFCSP Parallel CMOS Pin Configuration (Top View)

Table 12. Pin Function Descriptions (Parallel CMOS Mode)

Pin No.

Mnemonic

Type

Description

ADC Power Supplies

20, 64

DRGND

Ground

Digital Output Ground.

1, 21

DRVDD

Supply

Digital Output Driver Supply (1.8 V to 3.3 V).

24, 57

DVDD

Supply

Digital Power Supply (1.8 V Nominal).

36, 45, 46

AVDD

Supply

Analog Power Supply (1.8 V Nominal).

AGND

Ground

Analog Ground. Pin 0 is the exposed thermal pad on the bottom of the package.

ADC Analog

VIN+A

Input

Differential Analog Input Pin (+) for Channel A.

VIN−A

Input

Differential Analog Input Pin (−) for Channel A.

VIN+B

Input

Differential Analog Input Pin (+) for Channel B.

VIN−B

Input

Differential Analog Input Pin (−) for Channel B.

VREF

Input/Output

Voltage Reference Input/Output.

SENSE

Input

Voltage Reference Mode Select. (See Table 15 for details.)

RBIAS

Input/Output

External Reference Bias Resistor.

CML

Output

Common-Mode Level Bias Output for Analog Inputs.

CLK+

Input

ADC Clock Input—True.

CLK−

Input

ADC Clock Input—Complement.

ADC Fast Detect Outputs

FD0A

Output

Channel A Fast Detect Indicator. (See Table 21 for details.)

FD1A

Output

Channel A Fast Detect Indicator. (See Table 21 for details.)

FD2A

Output

Channel A Fast Detect Indicator. (See Table 21 for details.)

FD3A

Output

Channel A Fast Detect Indicator. (See Table 21 for details.)

FD0B

Output

Channel B Fast Detect Indicator. (See Table 21 for details.)

FD1B

Output

Channel B Fast Detect Indicator. (See Table 21 for details.)

FD2B

Output

Channel B Fast Detect Indicator. (See Table 21 for details.)

FD3B

Output

Channel B Fast Detect Indicator. (See Table 21 for details.)

Digital Input

SYNC

Input

Digital Synchronization Pin. Slave mode only.

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