AD9705 datasheet(13/42 Pages) AD

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Data Sheet

AD9704/AD9705/AD9706/AD9707

Rev. D | Page 13 of 42

AD9706

DB0 (LSB)

DB1

DB2

DB3

DVDD

DB4

DB5

PIN/SPI/RESET

AVDD

OTCM

IOUTB

IOUTA

ACOM

REFIO

FS ADJ

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

2. IT IS RECOMMENDED THAT THE EXPOSED PAD BE

THERMALLY CONNECTED TO A COPPER GROUND

PLANE FOR ENHANCED ELECTRICAL AND THERMAL

PERFORMANCE.

PIN 1

INDICATOR

AD9706

TOP VIEW

(Not to Scale)

Figure

4. AD9706 Pin Configuration

Table 10. AD9706 Pin Function Descriptions

Pin No.

Mnemonic

Description

28 to 32, 1,

2, 4 to 6

DB10 to DB1

Data Bit 10 to Data Bit 1.

DVDD

Digital Supply Voltage (1.7 V to 3.6 V). DVDD, AVDD, and CLKVDD must be at the same supply voltage.

DB0 (LSB)

Least Significant Data Bit (LSB).

8, 9

No Connect.

10, 26

DCOM

Digital Common.

CLKVDD

Clock Supply Voltage (1.7 V to 3.6 V). DVDD, AVDD, and CLKVDD must be at the same supply voltage.

CLK+

Positive Differential Clock Input.

CLK−

Negative Differential Clock Input.

CLKCOM

Clock Common.

CMODE/SCLK

In pin mode, this pin selects the clock input type. Connect to CLKCOM for single-ended clock receiver (drive

CLK+ and float CLK–). Connect to CLKVDD for differential receiver. In SPI mode, this pin is the serial data

clock input.

MODE/SDIO

In pin mode, this pin selects the input data format. Connect to DCOM for straight binary, and DVDD for twos

complement. In SPI mode, this pin acts as SPI data input/output.

PIN/SPI/RESET

Selects SPI Mode or Pin Mode Operation. Active high for pin mode operation, and active low for SPI mode

operation. Pulse high to reset SPI registers to default values.

AVDD

Analog Supply Voltage (1.7 V to 3.6 V). DVDD, AVDD, and CLKVDD must be at the same supply voltage.

OTCM

Adjustable Output Common Mode. Refer to the Theory of Operation section for details.

IOUTB

Complementary DAC Current Output. Full-scale current is sourced when all data bits are 0s.

IOUTA

DAC Current Output. Full-scale current is sourced when all data bits are 1s.

ACOM

Analog Common.

REFIO

Reference Input/Output. Serves as reference input when internal reference disabled. Serves as 1.0 V

reference output when internal reference is activated. Requires a 0.1 µF capacitor to ACOM when internal

reference is activated.

FS ADJ

Full-Scale Current Output Adjust.

SLEEP/CSB

In pin mode, active high powers down chip. In SPI mode, this pin is the serial port chip select (active low).

DB11 (MSB)

Most Significant Data Bit (MSB).

EPAD

It is recommended that the exposed pad be thermally connected to a copper ground plane for enhanced

electrical and thermal performance.

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