2.7 V to 5.5 V, 140 μA, Rail-to-Rail Output

12-Bit DAC in an SOT-23

AD5320

Rev. C

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FEATURES

Single 12-bit DAC

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

Micropower operation: 140 μA @ 5 V

Power-down to 200 nA @ 5 V, 50 nA @ 3 V

2.7 V to 5.5 V power supply

Guaranteed monotonic by design

Reference derived from power supply

Power-on reset to zero volts

Three power-down functions

Low power serial interface with Schmitt-triggered inputs

On-chip output buffer amplifier, rail-to-rail operation

SYNC interrupt facility

APPLICATIONS

Portable battery-powered instruments

Digital gain and offset adjustment

Programmable voltage and current sources

Programmable attenuators

FUNCTIONAL BLOCK DIAGRAM

GND

AD5320

12-BIT

DAC

SCLK DIN

REF (+) REF (–)

REGISTER

NETWORK

POWER-DOWN

CONTROL LOGIC

DAC

REGISTER

OUTPUT

BUFFER

POWER-ON

RESET

SYNC

INPUT

CONTROL

LOGIC

Figure 1.

GENERAL DESCRIPTION

The AD53201 is a single, 12-bit buffered voltage out digital-to-

analog converter (DAC) that operates from a single 2.7 V to

5.5 V supply consuming 115 μA at 3 V. Its on-chip precision

output amplifier allows rail-to-rail output swing to be achieved.

The AD5320 utilizes a versatile 3-wire serial interface that

operates at clock rates up to 30 MHz and is compatible with

standard SPI®, QSPI™, MICROWIRE™ and digital signal

processing (DSP) interface standards.

The reference for AD5320 is derived from the power supply

inputs and thus gives the widest dynamic output range. The

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

DAC output powers up to zero volts and remains there until a

valid write takes place to the device. The part contains a power-

down feature that reduces the current consumption of the

device to 200 nA at 5 V and provides software selectable output

loads while in power-down mode. The part is put into power-

down mode over the serial interface.

The low power consumption of this part in normal operation

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

The power consumption is 0.7 mW at 5 V reducing to 1 μW in

power-down mode.

The AD5320 is one of a family of pin-compatible DACs. The

AD5300 is the 8-bit version and the AD5310 is the 10-bit

version. The AD5300/AD5310/AD5320 are available in 6-lead

SOT-23 packages and 8-lead MSOP packages.

PRODUCT HIGHLIGHTS

1.

Available in 6-lead SOT-23 and 8-lead MSOP packages.

2.

Low power, single-supply operation. This part operates

from a single 2.7 V to 5.5 V supply and typically consumes

0.35 mW at 3 V and 0.7 mW at 5 V, making it ideal for

battery-powered applications.

3.

The on-chip output buffer amplifier allows the output of

the DAC to swing rail-to-rail with a slew rate of 1 V/μs.

4.

Reference derived from the power supply.

5.

High speed serial interface with clock speeds up to

30 MHz. Designed for very low power consumption. The

interface only powers up during a write cycle.

6.

Power-down capability. When powered down, the DAC

typically consumes 50 nA at 3 V and 200 nA at 5 V.