EVAL-AD5781SDZ 查看數據表（PDF） - Analog Devices
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EVAL-AD5781SDZ Datasheet PDF : 27 Pages
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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
GENERAL DESCRIPTION
The AD57811 is a single 18-bit, unbuffered voltage output digital-
to-analog converter (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 specifi-
cation of ±0.5 LSB maximum, and operation is guaranteed
monotonic with a ±0.5 LSB differential nonlinearity (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
serial peripheral interface (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.
FUNCTIONAL BLOCK DIAGRAM
VCC
VDD
VREFPF VREFPS
IOVCC
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 RFB RFB
INV
VOUT
6kΩ
POWER-ON-RESET
AND CLEAR LOGIC
DGND
VSS
AGND VREFNF VREFNS
Figure 1.
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.
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
Table 2. Related Devices
Part No.
Description
AD5791
20-bit, 1 ppm accurate DAC
AD5541A/AD5542A 16-bit, 1 LSB accurate 5 V DAC
1 Protected by U.S. Patent No 7,884,747, and other patents are pending.
Rev. E
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