2.5 V to 5.5 V, 120 μA, 2-Wire Interface,

Voltage-Output 8-/10-/12-Bit DACs

AD5301/AD5311/AD5321

Rev. B

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FEATURES

AD5301: buffered voltage output 8-bit DAC

AD5311: buffered voltage output 10-bit DAC

AD5321: buffered voltage output 12-bit DAC

6-lead SOT-23 and 8-lead MSOP packages

Micropower operation: 120 μA @ 3 V

Data readback capability

2.5 V to 5.5 V power supply

Guaranteed monotonic by design over all codes

Power-down to 50 nA @ 3 V

Reference derived from power supply

Power-on reset to 0 V

On-chip rail-to-rail output buffer amplifier

3 power-down functions

APPLICATIONS

Portable battery-powered instruments

Digital gain and offset adjustment

Programmable voltage and current sources

Programmable attenuators

GENERAL DESCRIPTION

The AD5301/AD5311/AD53211 are single 8-/10-/12-bit, buff-

ered, voltage-output DACs that operate from a single 2.5 V to

5.5 V supply, consuming 120 μA at 3 V. The on-chip output

amplifier allows rail-to-rail output swing with a slew rate of

operates at clock rates up to 400 kHz. Multiple devices can share

the same bus.

The reference for the DAC is derived from the power supply

inputs and thus gives the widest dynamic output range. These

parts incorporate a power-on reset circuit, which ensures that

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

valid write takes place. The parts contain a power-down feature

that reduces the current consumption of the device to 50 nA at

3 V and provides software-selectable output loads while in

power-down mode.

The low power consumption in normal operation makes these

DACs ideally suited to portable battery-operated equipment. The

power consumption is 0.75 mW at 5 V and 0.36 mW at 3 V,

reducing to 1 μW in all power-down modes.

FUNCTIONAL BLOCK DIAGRAM

RESISTOR

NETWORK

BUFFER

DAC

REGISTER

POWER-DOWN

LOGIC

AD5301/AD5311/AD5321

SCL

A0

GND

A1*

REF

POWER-ON

RESET

PD*

SDA

*AVAILABLE ON 8-LEAD VERSION ONLY

INTERFACE

LOGIC

8-/10-/12-BIT

DAC

Figure 1.