AD5781 Datasheet, PDF (1/28 Pages) Analog Devices – True 18-Bit, Voltage Output DAC ±0.5 LSB INL, ±0.5 LSB DNL

Data Sheet
True 18-Bit, Voltage Output DAC
±0.5 LSB INL, ±0.5 LSB DNL
AD5781
FEATURES
Single 18-bit DAC, ±0.5 LSB INL
7.5 nV/√Hz noise spectral density
0.05 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 of 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
Scientific and aerospace instrumentation
Data acquisition systems
Digital gain and offset adjustment
Power supply control
FUNCTIONAL BLOCK DIAGRAM
V_CC
V_DD
V_REFPF V_REFPS
IOV_CC
SDIN
SCLK
SYNC
SDO
LDAC
CLR
RESET
AD5781
INPUT
SHIFT
18
REGISTER
AND
CONTROL
LOGIC
DAC ¹⁸
REG
18-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
Ultraprecision, 36 V, 2.8 nV/√Hz rail-to-rail
output op amp
AD8676
Ultraprecision, 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
GENERAL DESCRIPTION
The AD5781¹ is a single 18-bit, unbuffered voltage output DAC
that operates from a bipolar supply of up to 33 V. The AD5781
accepts a positive reference input range of 5 V to VDD − 2.5 V and
a negative reference input range of VSS + 2.5 V to 0 V. The
AD5781 offers a relative accuracy specification of ±0.5 LSB
maximum, and operation is guaranteed monotonic with a ±0.5
LSB DNL maximum specification.
The part uses a versatile 3-wire serial interface that operates at
clock rates of up to 35 MHz and is compatible with standard
SPI, QSPI™, MICROWIRE™, and DSP interface standards. The
part incorporates a power-on reset circuit that ensures that 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.
Table 2. Related Devices
Part No.
Description
AD5791
20-bit, 1 ppm accurate DAC
AD5541A/AD5542A 16-bit, 1 LSB accurate 5 V DAC
PRODUCT HIGHLIGHTS
1. True 18-Bit Accuracy.
2. Wide Power Supply Range of Up to ±16.5 V.
3. −40°C to +125°C Operating Temperature Range.
4. Low 7.5 nV/√Hz Noise.
5. Low 0.05 ppm/°C Temperature Drift.
1 _{Protected by U.S. Patent No 7884747, and other patents are pending.}
Rev. D
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