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AD8205WYRZ-RL 数据表(PDF) 10 Page - Analog Devices

部件名 AD8205WYRZ-RL
功能描述  Single-Supply 42 V System Difference Amplifier
Download  12 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8205WYRZ-RL 数据表(HTML) 10 Page - Analog Devices

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AD8205
Data Sheet
Rev. | Page 10 of 12
EXTERNAL REFERENCE OUTPUT
Tying both pins together and to a reference produces an output
at the reference voltage when there is no differential input (see
Figure 16). The output moves down from the reference voltage
when the input is negative relative to the −IN pin and up when
the input is positive relative to the −IN pin.
AD8205
+IN
–IN
NC
NC = NO CONNECT
GND
V+
OUT
VREF1
VREF2
2.5V VOLTAGE
REFERENCE
Figure 16. External Reference Output
SPLITTING THE SUPPLY
By tying one reference pin to V+ and the other to the ground
pin, the output is set at half of the supply when there is no
differential input (see Figure 17). The benefit is that no external
reference is required to offset the output for bidirectional
current measurement. This creates a midscale offset that is
ratiometric to the supply, which means that if the supply increases
or decreases, the output remains at half the supply. For example, if
the supply is 5.0 V, the output is at half scale or 2.5 V. If the supply
increases by 10% (to 5.5 V), the output goes to 2.75 V.
AD8205
+IN
–IN
NC
NC = NO CONNECT
GND
V+
OUT
VREF1
VREF2
Figure 17. Split Supply
SPLITTING AN EXTERNAL REFERENCE
In this case, an external reference is divided by 2 with an
accuracy of approximately 0.5% by connecting one VREF pin to
ground and the other VREF pin to the reference (see Figure 18).
AD8205
+IN
–IN
NC
NC = NO CONNECT
GND
V+
OUT
VREF1
VREF2
5V
VOLTAGE
REFERENCE
Figure 18. Split External Reference
D


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