參數(shù)資料
型號(hào): AD8207WBRZ-RL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 5/16頁(yè)
文件大小: 0K
描述: IC AMP 65V DIFF BIDIRECT 8SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 零漂移
電路數(shù): 1
轉(zhuǎn)換速率: 1 V/µs
-3db帶寬: 150kHz
電壓 - 輸入偏移: 100µV
電流 - 電源: 2.5mA
電壓 - 電源,單路/雙路(±): 3.3 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 帶卷 (TR)
AD8207
Rev. 0 | Page 13 of 16
EXTERNAL REFERENCED OUTPUT
Tying both reference pins together and to an external reference
produces an output equal to the reference voltage when there is
no differential input (see Figure 30). 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. The reference pins are connected to the positive input
of the main amplifier via precision-trimmed 100 kΩ resistors.
Therefore, it is recommended that a low impedance voltage is
always be used to set the reference voltage. If external resistors
are connected directly to the VREF1 and VREF2 pins, there will
be a mismatch with the internal trimmed resistors, leading to
offset gain accuracy reduction.
RANGE
V+
5V
REF
+IN
–IN
OUT
VOLTAGE
REFERENCE
GND
AD8207
ZERO
DRIFT
VREF1
VREF2
2.5V
09
16
0-
0
14
Figure 30. External Referenced Output, V+ = 5 V
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 dif-
ferential input (see Figure 31). 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.
RANGE
V+
5V
REF
+IN
–IN
OUT
GND
AD8207
ZERO
DRIFT
VREF1
VREF2
09
16
0-
0
15
Figure 31. Splitting the Supply, V+ = 5 V
SPLITTING AN EXTERNAL REFERENCE
In Figure 32, 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 32).
V+
5V
REF
+IN
–IN
OUT
VOLTAGE
REFERENCE
GND
AD8207
ZERO
DRIFT
VREF1
VREF2
5V
09
16
0-
0
16
RANGE
Figure 32. Splitting an External Reference, V+ = 5 V
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