EVAL-AD5666EB【PDF 1/28 页】Quad, 16-Bit DAC with 5 ppm/C On-Chip Re

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Quad, 16-Bit DAC with 5 ppm/°C

On-Chip Reference in 14-Lead TSSOP

AD5666

FEATURES

Low power quad 16-bit DAC

14-lead TSSOP

On-chip 1.25 V/2.5 V, 5 ppm/°C reference

Power down to 400 nA @ 5 V, 200 nA @ 3 V

2.7 V to 5.5 V power supply

Guaranteed monotonic by design

Power-on reset to zero scale or midscale

3 power-down functions

Hardware LDAC with LDAC override function

CLR function to programmable code

SDO daisy-chaining option

Rail-to-rail operation

APPLICATIONS

Process control

Data acquisition systems

Portable battery-powered instruments

Digital gain and offset adjustment

Programmable voltage and current sources

Programmable attenuators

GENERAL DESCRIPTION

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

FUNCTIONAL BLOCK DIAGRAM

INLOGIC

RINPUT

DIN

LDAC

GND

LDAC

REFIN

REFOUT

SYNC

SCLK

AD5666

CLR

1.2REF

OUT

DAC

DAC A

BUFFER

RINPUT

REDAC

DAC B

BUFFER

RINPUT

REDAC

DAC C

BUFFER

RINPUT

REDAC

DAC D

BUFFER

SDO

POR

POLOGIC

PRESET

Figure 1.

The AD5666 is a low power, quad, 16-bit, buffered voltage-

output DAC. The part operates from a single 2.7 V to 5.5 V

supply and is guaranteed monotonic by design.

The AD5666 has an on-chip reference with an internal gain of 2.

The AD5666-1 has a 1.25 V 5 ppm/°C reference, giving a full-scale

output of 2.5 V; the AD5666-2 has a 2.5 V 5 ppm/°C reference,

giving a full-scale output of 5 V. The on-board reference is off at

power-up, allowing the use of an external reference. The internal

reference is turned on by writing to the DAC.

The part incorporates a power-on reset circuit that ensures that

the DAC output powers up to 0 V (POR pin low) or to midscale

(POR pin high) and remains powered up at this level until a valid

write takes place. The part contains a power-down feature that

reduces the current consumption of the device to 400 nA at 5 V

and provides software-selectable output loads while in power-down

mode for any or all DAC channels.

The outputs of all DACs can be updated simultaneously using

the LDAC function, with the added functionality of user-select-

able DAC channels to simultaneously update. There is also an

asynchronous CLR that clears all DACs to a software-selectable

code—0 V, midscale, or full scale.

The AD5666 utilizes a versatile 3-wire serial interface that operates

at clock rates of up to 50 MHz and is compatible with standard

SPI, QSPI, MICROWIRE, and DSP interface standards. The

on-chip precision output amplifier enables rail-to-rail output

swing.

PRODUCT HIGHLIGHTS

Quad, 16-bit DAC.

On-chip 1.25 V/2.5 V, 5 ppm/°C reference.

Available in 14-lead TSSOP.

Selectable power-on reset to 0 V or midscale.

Power-down capability. When powered down, the DAC

typically consumes 200 nA at 3 V and 400 nA at 5 V.

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