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Numéro de référence | AD5781 | ||
Description | Voltage Output DAC | ||
Fabricant | Analog Devices | ||
Logo | |||
1 Page
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 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.
FUNCTIONAL BLOCK DIAGRAM
VCC
VDD
VREFPF VREFPS
IOVCC
SDIN
SCLK
SYNC
SDO
LDAC
CLR
RESET
AD5781
INPUT
SHIFT
REGISTER
AND
CONTROL
LOGIC
18
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.
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
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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Tel: 781.329.4700 ©2010–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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Pages | Pages 29 | ||
Télécharger | [ AD5781 ] |
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