DAC121S101

12-Bit Micro Power Digital-to-Analog Converter with

Rail-to-Rail Output

General Description

The DAC121S101 is a full-featured, general purpose 12-bit

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

operate from a single +2.7V to 5.5V supply and consumes

just 177 µA of current at 3.6 Volts. The on-chip output

amplifier allows rail-to-rail output swing and the three wire

serial interface operates at clock rates up to 30 MHz over the

specified supply voltage range and is compatible with stan-

petitive devices are limited to 20 MHz clock rates at supply

voltages in the 2.7V to 3.6V range.

The supply voltage for the DAC121S101 serves as its volt-

age reference, providing the widest possible output dynamic

range. A power-on reset circuit ensures that the DAC output

powers up to zero volts and remains there until there is a

valid write to the device. A power-down feature reduces

power consumption to less than a microWatt.

The low power consumption and small packages of the

DAC121S101 make it an excellent choice for use in battery

operated equipment.

The DAC121S101 is a direct replacement for the AD5320

and the DAC7512 and is one of a family of pin compatible

DACs, including the 8-bit DAC081S101 and the 10-bit

DAC101S101. The DAC121S101 operates over the ex-

tended industrial temperature range of −40˚C to +105˚C.

Features

n

Guaranteed Monotonicity

n

Low Power Operation

n

Rail-to-Rail Voltage Output

n

Power-on Reset to Zero Volts Output

n

SYNC Interrupt Facility

n

Wide power supply range (+2.7V to +5.5V)

n

Small Packages

n

Power Down Feature

Key Specifications

n

Resolution

12 bits

n

DNL

+0.25, -0.15 LSB (typ)

n

Output Settling Time

8 µs (typ)

n

Zero Code Error

4 mV (typ)

n

Full-Scale Error

−0.06 %FS (typ)

n

Power Consumption

— Normal Mode

0.64mW (3.6V) / 1.43mW (5.5V) typ

— Pwr Down Mode

0.14µW (3.6V) / 0.39µW (5.5V) typ

Applications

n

Battery-Powered Instruments

n

Digital Gain and Offset Adjustment

n

Programmable Voltage & Current Sources

n

Programmable Attenuators

Pin Configuration

20114901

20114902

Ordering Information

Order Numbers

Temperature Range

Package

Top Mark

DAC121S101CIMM

−40˚C

≤ T

A

≤ +105˚C

MSOP

X60C

DAC121S101CIMMX

−40˚C

≤ T

A

≤ +105˚C

MSOP Tape-and-Reel

X60C

DAC121S101CIMK

−40˚C

≤ T

A

≤ +105˚C

TSOT

X61C

DAC121S101CIMKX

−40˚C

≤ T

A

≤ +105˚C

TSOT Tape-and-Reel

X61C

DAC121S101EVAL

Evaluation Board

June 2005

© 2005 National Semiconductor Corporation

DS201149

www.national.com