Dual 12-/14-/16-Bit nanoDAC with

5 ppm/°C On-Chip Reference

Data Sheet

AD5623R/AD5643R/AD5663R

Rev. G

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FEATURES

Low power, smallest pin-compatible, dual nanoDAC

AD5663R: 16 bits

AD5643R: 14 bits

AD5623R: 12 bits

User-selectable external or internal reference

External reference default

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

10-lead MSOP and 3 mm × 3 mm LFCSP

2.7 V to 5.5 V power supply

Guaranteed monotonic by design

Power-on reset to zero scale

Per channel power-down

Serial interface up to 50 MHz

Hardware LDAC and CLR functions

APPLICATIONS

Process control

Data acquisition systems

Portable battery-powered instruments

Digital gain and offset adjustment

Programmable voltage and current sources

Programmable attenuators

FUNCTIONAL BLOCK DIAGRAM

INTERFACE

LOGIC

SCLK

SYNC

DIN

CLR

INPUT

REGISTER

INPUT

REGISTER

DAC

REGISTER

DAC

REGISTER

GND

POWER-ON

RESET

STRING

DAC A

STRING

DAC B

BUFFER

BUFFER

POWER-DOWN

LOGIC

AD5623R/AD5643R/AD5663R

LDAC

LDAC

1.25V/2.5V

REFERENCE

Figure 1.

Table 1. Related Devices

Part No.

Description

AD5663

2.7 V to 5.5 V, dual 16-bit nanoDAC, with external

reference

GENERAL DESCRIPTION

The AD5623R/AD5643R/AD5663R, members of the nanoDAC®

family, are low power, dual 12-, 14-, and 16-bit buffered voltage-

out digital-to-analog converters (DAC) that operate from a single

2.7 V to 5.5 V supply and are guaranteed monotonic by design.

The AD5623R/AD5643R/AD5663R have an on-chip reference.

The AD5623R-3/AD5643R-3/AD5663R-3 have a 1.25 V,

5 ppm/°C reference, giving a full-scale output of 2.5 V; and the

AD5623R-5/AD5643R-5/AD5663R-5 have a 2.5 V, 5 ppm/°C

reference, giving a full-scale output of 5 V. The on-chip

reference is off at power-up, allowing the use of an external

reference; and all devices can be operated from a single 2.7 V to

5.5 V supply. The internal reference is turned on by writing to

the DAC.

The parts incorporate a power-on reset circuit that ensures the

DAC output powers up to 0 V and remains there until a valid

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

reduces the current consumption of the device to 480 nA at 5 V

and provides software-selectable output loads while in power-

down mode.

The low power consumption of this part in normal operation

makes it ideally suited to portable, battery-operated equipment.

The AD5623R/AD5643R/AD5663R use a versatile, 3-wire serial

interface that operates at clock rates up to 50 MHz, and they are

compatible with standard SPI®, QSPI™, MICROWIRE™, and

DSP interface standards. The on-chip precision output amplifier

enables rail-to-rail output swing to be achieved.

PRODUCT HIGHLIGHTS

1. Dual 12-, 14-, and 16-bit DAC.

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

3. Available in 10-lead MSOP and 10-lead, 3 mm ×

3 mm LFCSP.

4. Low power; typically consumes 0.6 mW at 3 V and

1.25 mW at 5 V.

5. 4.5 μs maximum settling time for the AD5623R.