AD5790 Datasheet, PDF (1/28 Pages) Analog Devices – System Ready, 20-Bit, ±2LSB INL

Data Sheet
System Ready, 20-Bit, ±2LSB INL,
Voltage Output DAC
AD5790
FEATURES
Single 20-bit voltage output DAC, ±2 LSB INL
8 nV/√Hz output noise spectral density
0.1 LSB long-term linearity error stability
±0.018 ppm/°C gain error temperature coefficient
2.5 μs output voltage settling time
3.5 nV-sec midscale glitch impulse
Integrated precision reference buffers
Operating temperature range: −40°C to +125°C
4 mm × 5 mm LFCSP 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 AD5790¹ is a single 20-bit, unbuffered voltage-output DAC
that operates from a bipolar supply of up to 33 V. The AD5790
accepts a positive reference input in the range of 5 V to VDD −
2.5 V and a negative reference input in the range of VSS + 2.5 V
to 0 V. The AD5790 offers a relative accuracy specification of
±2 LSB maximum range, and operation is guaranteed mono-
tonic with a −1 LSB to +3 LSB DNL 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.
Reference buffers are also provided on chip. The part incorpo-
rates a power-on reset circuit that ensures the DAC output
powers up to 0 V in a known output impedance state and
remains in this state until a valid write to the device takes place.
The part provides a disable feature that places the output in a
defined load state. The part provides an output clamp feature
that places the output in a defined load state.
1 _{Protected by U.S. Patent No. 7,884,747.}
FUNCTIONAL BLOCK DIAGRAM
V_CC
V_DD
V_REFP
IOV_CC
SDIN
SCLK
SYNC
SDO
LDAC
CLR
RESET
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
AD5790
DGND
V_SS AGND
V_REFN
Figure 1.
Table 1. Related Devices
Part No.
Description
AD5791
20-bit, 1 LSB accurate DAC
AD5780
18-bit, ±1 LSB INL, voltage output DAC ,
buffered reference inputs
AD5781
18-bit, ±1 LSB INL, voltage Output DAC ,
unbuffered reference inputs
AD5760
16-bit, ±0.5 LSB INL, voltage Output DAC
AD5541A/AD5542A 16-bit, 1 LSB accurate 5 V DAC
PRODUCT HIGHLIGHTS
1. 20-bit resolution.
2. Wide power supply range of up to ±16.5 V.
3. −40°C to +125°C operating temperature range.
4. Low 8 nV/√Hz noise.
5. Low ±0.018 ppm/°C gain error temperature coefficient.
COMPANION PRODUCTS
Output Amplifier Buffer: AD8675, ADA4898-1, ADA4004-1
External Reference: ADR445
DC-to-DC Design Tool: ADIsimPower™
Additional companion products on the AD5790 product page
Rev. B
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