DAC8734

DAC8734

1

FEATURES

DESCRIPTION

APPLICATIONS

Power-Down

ControlLogic

CS

SCLK

SDI

SDO

IOV

DD

RST

UNI/BIP-A

UNI/BIP-B

LDAC

GPIO-0

GPIO-1

AIN

DAC8734

ReferenceBufferA

V

MON

R

-0

FB1

R

-0

FB2

V

-0

OUT

SGND-0

16-BitDAC

SPI

Shift

Register

Input

Control

Logic

Control

Logic

DGND

DV

DD

DACRegister0

ZeroRegister0

GainRegister0

AGND

AV

DD

AV

SS

REF-A

REFGND-A

Analog

Monitor

ReferenceBufferB

REF-B

REFGND-B

R

-1

FB1

R

-1

FB2

V

-1

OUT

SGND-1

16-BitDAC

DACRegister1

ZeroRegister1

GainRegister1

R

-2

FB1

R

-2

FB2

V

-2

OUT

SGND-2

16-BitDAC

DACRegister2

ZeroRegister2

GainRegister2

R

-3

FB1

R

-3

FB2

V

-3

OUT

SGND-3

16-BitDAC

DACRegister3

ZeroRegister3

GainRegister3

CommandRegister

DAC8734

Quad, 16-Bit, High-Accuracy, ±16V Output, Serial Input

DIGITAL-TO-ANALOG CONVERTER

2345

• Bipolar Output: Up to ±16V

The DAC8734 is a high-accuracy, quad-channel,

16-bit digital-to-analog converter (DAC) that operates

• Unipolar Output: 0V to +20V

from supply voltages of ±5V to ±18V in bipolar output

• 16-Bit Monotonic

mode, and from ±5V to +24V/–12V in unipolar mode.

• Relative Accuracy: 1 LSB Max

With a 5V reference, the DAC8734 can be configured

• Low Zero and Gain Errors

to output ±10V, ±5V, 0V to 20V, or 0V to 10V. The

DAC8734 provides 16-bit monotonicity, excellent

–

Before User Calibration: 4 LSB

integral nonlinearity (INL) error of ±1 LSB, low glitch,

–

After User Calibration:

and low noise over the operating temperature range

0.125 LSB Zero Error, 1 LSB Gain Error

of –40°C to +105°C. This device is trimmed in

production for very low zero and gain errors. In

• Low Noise: 60nV/√Hz

addition,

the

DAC8734

implements

a

• Settling Time: 6µs

user-programmable system-level calibration function

• Configurable Gain: x2/x4

to achieve ±0.125 LSB zero error and ±1 LSB gain

• Analog Output Monitor

error.

• Power-Down Mode

The DAC8734 has integrated reference buffers and

output buffers. It features a standard high-speed

• SPI™: Up to 50MHz, 1.8V/3V/5V Logic

1.8V, 3V, or 5V serial peripheral interface (SPI) that

• Daisy-Chain Mode

operates

at

clock

rates

of

up

to

50MHz

to

• Operating Temperature: –40°C to +105°C

communicate with a DSP or microprocessor. The four

• Packages: QFN-40 (6x6mm), TQFP-48 (7x7mm)

DAC

channels

and

the

auxiliary

registers

are

addressed with four address bits. The device features

double-buffered

interface

logic

for

simultaneous

updates of all DACs. An asynchronous load input

• Automatic Test Equipment

(LDAC) transfers data from the input data register to

• Instrumentation

the DAC latch, and the contents of the DAC latch set

• Industrial Process Control

the output voltage. The asynchronous RST input sets

• Communications

analog monitor output that multiplexes the individual

DAC outputs or the AIN pin.

The DAC8734 is pin-compatible with the DAC8234

(14-bit) and the DAC7716 (12-bit).

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

DSP is a trademark of Texas Instruments.

3

SPI, QSPI are trademarks of Motorola Inc.

4

Microwire is a trademark of National Semiconductor.

5

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.