1 ppm 20-Bit,
±1 LSB INL, Voltage Output DAC
AD5791
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VDD
VCC
VREFPF VREFPS
AD5791
IOVCC
A1
6.8kΩ 6.8kΩ
R1
RFB
RFB
INV
SDIN
INPUT
SHIFT
REGISTER
AND
CONTROL
LOGIC
SCLK
SYNC
SDO
20
DAC
REG
20
20-BIT
DAC
VOUT
6kΩ
LDAC
CLR
POWER-ON-RESET
AND CLEAR LOGIC
RESET
DGND
VSS
AGND
VREFNF VREFNS
08964-001
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
Figure 1.
APPLICATIONS
Medical instrumentation
Test and measurement
Industrial control
High end scientific and aerospace instrumentation
Table 1. Complementary Devices
Part No.
AD8675
AD8676
ADA4898-1
Description
Ultra precision, 36 V, 2.8 nV/√Hz rail-to-rail
output op amp
Ultra precision, 36 V, 2.8 nV/√Hz dual rail-torail output op amp
High voltage, low noise, low distortion, unity
gain stable, high speed op amp
Table 2. Related Device
Part No.
AD5781
Description
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
accepts a positive reference input in the range 5 V to VDD − 2.5 V
and a negative reference input in the range VSS + 2.5 V to 0 V.
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
1
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.
2.
3.
4.
5.
1 ppm Accuracy.
Wide Power Supply Range up to ±16.5 V.
Operating Temperature Range: −40°C to +125°C.
Low 7.5 nV/√Hz Noise Spectral Density.
Low 0.05 ppm/°C Temperature Drift.
Protected by U.S. Patent No. 7,884,747. Other patents pending.
Rev. D
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