DAC9881

1

FEATURES

DESCRIPTION

APPLICATIONS

R

FB

(1)

Control

Logic

DV

DD

DGND

IOV

DD

AGND

AV

DD

V

-S

REFH

V

-F

REFH

RST

RSTSEL

USB/BTC

GAIN

SDI

CS

SCLK

Input

Register

DAC

Latch

LDAC

V

-S

REFL

V

-F

REFL

Resistor

Network

DAC

NOTE:(1) R

=5k

forgain=1,

W

FB

R

=10k

forgain=2.

W

FB

DAC9881

SerialOut

Control

SDOSEL

SDO

Power-On

Reset

PDN

V

OUT

R

FB

DAC9881

18-Bit, Single-Channel, Low-Noise, Voltage-Output

DIGITAL-TO-ANALOG CONVERTER

23

• Relative Accuracy: ±2 LSB

The

DAC9881

is

an

18-bit,

single-channel,

voltage-output digital-to-analog converter (DAC) that

• 18-Bit Monotonic Over Temperature Range

offers low-power operation and a flexible SPI serial

• Low-Noise: 24nV/√Hz

interface.

It

also

features

18-bit

monotonicity,

• Fast Settling: 5µs

excellent linearity, and fast settling time. The on-chip

• On-Chip Output Buffer Amplifier with

precision output amplifier allows rail-to-rail output

swing to be achieved over the full supply range of

Rail-to-Rail Operation

4.75V to 5.5V.

• Single Power Supply: +4.75V to +5.5V

The device supports a standard SPI serial interface

• DAC Loading Control

capable of operating with input data clock frequencies

• Selectable Power-On Reset to Zero-Scale or

up to 50MHz. The DAC9881 requires an external

Midscale

reference voltage to set the output range of the DAC

• Power-Down Mode

channel. A programmable power-on reset circuit is

also incorporated into the device to ensure that the

• Unipolar Straight Binary or

DAC output powers up at zero-scale or midscale, and

2s Complement Input Mode

remains there until a valid write command.

• Fast SPI™ Interface with Schmitt-Triggered

Additionally, the device has the capability to function

Inputs:

in either unipolar straight binary or 2s complement

Up To 50MHz, 1.8V/3V/5V Logic

mode. The DAC9881 provides a power-down feature,

• Small Package: QFN-24, 4mm × 4mm

accessed over the PDN pin, that reduces the current

consumption to 25

µA at 5V. Power consumption is

6mW at 5V, reducing to 125

µW in power-down mode.

• Industrial Process Control

The DAC9881 is available in a 4mm

× 4mm QFN-24

• Data Acquisition Systems

package with a specified operating temperature range

• Automatic Test Equipment

of –40

°C to +85°C.

• Communications

• Optical Networking

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

SPI is a trademark of Motorola, Inc.

3

All other trademarks are the property of their respective owners.

PRODUCT PREVIEW information concerns products in the

Copyright © 2008, Texas Instruments Incorporated

formative or design phase of development. Characteristic data and

other specifications are design goals. Texas Instruments reserves

the right to change or discontinue these products without notice.