AD9705BCPZ datasheet(13/52 Pages) AD

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AD9704/AD9705/AD9706/AD9707

Rev. 0 | Page 13 of 52

AD9705

TOP VIEW

(Not to Scale)

PIN 1

INDICATOR

DB0 (LSB)

DB1

DVDD

DB2

DB3

PIN/SPI/RESET

AVDD

OTCM

IOUTB

IOUTA

ACOM

REFIO

FS ADJ

NC = NO CONNECT

Figure 5. AD9705 Pin Configuration

Table 11. AD9705 Pin Function Descriptions

Pin No.

Mnemonic

Description

DB9 (MSB)

Most Significant Data Bit (MSB).

28 to 32,

1, 2, 4

DB8 to DB1

Data Bit 8 to Data Bit 1.

DB0 (LSB)

Least Significant Data Bit (LSB).

SLEEP/CSB

In pin mode, active high powers down chip.

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

FS ADJ

Full-Scale Current Output Adjust.

REFIO

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

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

ACOM

Analog Common.

IOUTA

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

IOUTB

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

OTCM

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

AVDD

Analog Supply Voltage (1.7 V to 3.6 V).

PIN/SPI/RESET

Selects SPI mode or pin mode operation. Active high for pin mode operation. Active low for SPI mode

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

MODE/SDIO

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

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

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.

CLKCOM

Clock Common.

CLK−

Differential Clock Input.

CLK+

Differential Clock Input.

CLKVDD

Clock Supply Voltage (1.7 V to 3.6 V).

10, 26

DCOM

Digital Common.

6 to 9

No Connect.

DVDD

Digital Supply Voltage (1.7 V to 3.6 V).

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