AD5791_13 Datasheet, PDF (1/28 Pages) Analog Devices – 1 ppm 20-Bit, 1 LSB INL, Voltage Output DAC

Data Sheet
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
1 ppm 20-Bit,
±1 LSB INL, Voltage Output DAC
AD5791
FUNCTIONAL BLOCK DIAGRAM
V_CC
V_DD
V_REFPF V_REFPS
IOV_CC
SDIN
SCLK
SYNC
SDO
LDAC
CLR
RESET
AD5791
INPUT
SHIFT
20
REGISTER
AND
CONTROL
LOGIC
DAC ²⁰
REG
20-BIT
DAC
6.8kΩ 6.8kΩ
A1
R1 R_FB ^RFB
INV
V_OUT
6kΩ
POWER-ON-RESET
AND CLEAR LOGIC
DGND
V_SS
AGND V_REFNF V_REFNS
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
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
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.}
Rev. D
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