AD5781BRUZ-REEL7 Analog Devices Inc, AD5781BRUZ-REEL7 Datasheet - Page 25

• Manufacturer Part Number: AD5781BRUZ-REEL7
• Description: 18bit, 1LSB, Unbuffered Ref
• Manufacturer: Analog Devices Inc

Specifications of AD5781BRUZ-REEL7

• Design Resources: 18-Bit Accurate, low noise, precision bipolar DC voltage source (CN0177)
• Settling Time: 1µs
• Number Of Bits: 18
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Gain of Two Configuration
Figure 50 shows an output amplifier configured for a gain of
two. The gain is set by the internal matched 6.8 kΩresistors,
which are exactly twice the DAC resistance, having the effect
of removing an offset from the input bias current of the external
amplifier. In this configuration, the output spans from 2 × V
V
output span from a single-ended reference input, with V
0 V. For this mode of operation, the RBUF bit of the control
register must be cleared to Logic 0.
REFP
to V
REFP.
This configuration is used to generate a bipolar
REFN
REFN
=
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−
1/2 AD8676
1/2 AD8676
V
V
Figure 50. Output Amplifier in Gain of Two Configuration
V
REFPF
REFNF
REFN
V
REFP
18-BIT
= 0V
DAC
V
V
REFNS
REFPS
A1
6.8kΩ 6.8kΩ
R
1
AD5781
R
FB
V
R
INV
OUT
FB
10pF
AD8675,
ADA4898-1,
ADA4004-1
AD5781
V
OUT