1 ppm 20-Bit,

±1 LSB INL, Voltage Output DAC

Data Sheet

AD5791

Rev. D

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FEATURES

1 ppm resolution

1 ppm INL

7.5 nV/√Hz noise spectral density

0.19 LSB long-term linearity stability

<0.05 ppm/°C temperature drift

1 µs settling time

1.4 nV-sec glitch impulse

Operating temperature range: −40°C to +125°C

20-lead TSSOP package

Wide power supply range up to ±16.5 V

35 MHz Schmitt triggered digital interface

1.8 V compatible digital interface

APPLICATIONS

Medical instrumentation

Test and measurement

Industrial control

High end scientific and aerospace instrumentation

FUNCTIONAL BLOCK DIAGRAM

A1

6.8kΩ

6kΩ

6.8kΩ

R1

20-BIT

DAC

DAC

REG

20

20

INPUT

SHIFT

REGISTER

AND

CONTROL

LOGIC

POWER-ON-RESET

AND CLEAR LOGIC

AD5791

SDIN

AGND

DGND

SCLK

SYNC

SDO

LDAC

CLR

RESET

INV

Figure 1.

Table 1. Complementary Devices

Part No.

Description

AD8675

Ultra precision, 36 V, 2.8 nV/√Hz rail-to-rail

output op amp

AD8676

Ultra precision, 36 V, 2.8 nV/√Hz dual rail-to-

rail output op amp

ADA4898-1

High voltage, low noise, low distortion, unity

gain stable, high speed op amp

Table 2. Related Device

Part No.

Description

AD5781

18-bit, 0.5 LSB INL, voltage output DAC

GENERAL DESCRIPTION

The AD57911 is a single 20-bit, unbuffered voltage-output DAC

that operates from a bipolar supply of up to 33 V. The AD5791

The AD5791 offers a relative accuracy specification of ±1 LSB

max, and operation is guaranteed monotonic with a ±1 LSB

DNL maximum specification.

The part uses a versatile 3-wire serial interface that operates at

clock rates up to 35 MHz and that is compatible with standard

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

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

output powers up to 0 V and in a known output impedance

state and remains in this state until a valid write to the device

takes place. The part provides an output clamp feature that

places the output in a defined load state.

PRODUCT HIGHLIGHTS

1. 1 ppm Accuracy.

2. Wide Power Supply Range up to ±16.5 V.

3. Operating Temperature Range: −40°C to +125°C.

4. Low 7.5 nV/√Hz Noise Spectral Density.

5. Low 0.05 ppm/°C Temperature Drift.

1

Protected by U.S. Patent No. 7,884,747. Other patents pending.