AD5666 Analog Devices Data Sheet

Quad, 16-Bit DAC with 5 ppm/°C On-Chip Reference in 14-Lead TSSOP

AD5666 FEATURES FUNCTIONAL BLOCK DIAGRAM

VDD VREFIN/VREFOUT

Low power quad 16-bit DAC

AD5666 1.25V/2.5V

14-lead TSSOP REF

LDAC BUFFER

On-chip 1.25 V/2.5 V, 5 ppm/°C reference INPUT DAC STRING VOUTA

REGISTER REGISTER DAC

Power down to 400 n A @ 5 V, 200 n A @ 3 V

BUFFER

INPUT DAC STRING VOUTB INTERFACE REGISTER REGISTER DAC

2.7 V to 5.5 V power supply SYNC LOGIC

BUFFER

INPUT DAC STRING VOUTC Guaranteed monotonic by design REGISTER REGISTER DAC

BUFFER

Power-on reset to zero scale or midscale INPUT DAC STRING VOUTD REGISTER REGISTER DAC

3 power-down functions POWER-ON POWER-DOWN

RESET LOGIC

Hardware LDAC with LDAC override function

LDAC CLR POR GND

CLR function to programmable code

Figure 1.

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

The AD5666 is a low power, quad, 16-bit, buffered voltage- The outputs of all DACs can be updated simultaneously using output DAC. The part operates from a single 2.7 V to 5.5 V the LDAC function, with the added functionality of user-select-

supply and is guaranteed monotonic by design. able DAC channels to simultaneously update. There is also an

asynchronous CLR that clears all DACs to a software-selectable

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

code—0 V, midscale, or full scale.

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,

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

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

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

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

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

reference is turned on by writing to the DAC.

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

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 PRODUCT HIGHLIGHTS

(POR pin high) and remains powered up at this level until a valid 1. Quad, 16-bit DAC. write takes place. The part contains a power-down feature that 2. On-chip 1.25 V/2.5 V, 5 ppm/°C reference. reduces the current consumption of the device to 400 n A at 5 V 3. Available in 14-lead TSSOP. and provides software-selectable output loads while in power-down 4. Selectable power-on reset to 0 V or midscale. mode for any or all DAC channels. 5. Power-down capability. When powered down, the DAC

typically consumes 200 n A at 3 V and 400 n A at 5 V.

Rev. D 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

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

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. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2005–2010 Analog Devices, Inc. All rights reserved.