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AD628 데이터시트(PDF) 18 Page - Analog Devices

부품명 AD628
상세설명  Low Power, Wide Supply Range, Low Cost Difference Amplifiers,
PDF  24 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD628 데이터시트(HTML) 18 Page - Analog Devices

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AD8278/AD8279
Rev. C | Page 18 of 24
APPLICATIONS INFORMATION
CONFIGURATIONS
The AD8278 and AD8279 can be configured in several ways
(see Figure 51 to Figure 57). These configurations have excellent
gain accuracy and gain drift because they rely on the internal
matched resistors. Note that Figure 53 shows the AD8278 and
AD8279 as difference amplifiers with a midsupply reference
voltage at the noninverting input. This allows the AD8278 and
AD8279 to be used as a level shifter, which is appropriate in
single-supply applications that are referenced to midsupply.
Table 10 lists several single-ended amplifier configurations
that are not illustrated.
40kΩ
2
3
5
1
6
20kΩ
40kΩ
20kΩ
–IN
OUT
+IN
VOUT = ½ (VIN+ − VIN−)
AD8278
Figure 51. Difference Amplifier, Gain = ½
20kΩ
5
1
2
3
6
40kΩ
20kΩ
40kΩ
–IN
OUT
+IN
VOUT = 2(VIN+ − VIN−)
AD8278
Figure 52. Difference Amplifier, Gain = 2
40kΩ
2
3
5
1
VREF = MIDSUPPLY
6
20kΩ
40kΩ
20kΩ
–IN
OUT
+IN
VOUT = ½ (VIN+ − VIN−) + VREF
AD8278
Figure 53. Difference Amplifier, Gain = ½, Referenced to Midsupply
20kΩ
5
1
2
3
VREF = MIDSUPPLY
6
40kΩ
20kΩ
40kΩ
–IN
OUT
+IN
VOUT = 2 (VIN+ − VIN−) + VREF
AD8278
Figure 54. Difference Amplifier, Gain = 2, Referenced to Midsupply
40kΩ
2
3
5
1
6
20kΩ
40kΩ
20kΩ
IN
OUT
VOUT = –½VIN
AD8278
Figure 55. Inverting Amplifier, Gain = −½
40kΩ
25
6
20kΩ
IN
OUT
3
1
40kΩ
20kΩ
VOUT = 1.5VIN
AD8278
Figure 56. Noninverting Amplifier, Gain = 1.5
20kΩ
2
3
5
1
6
40kΩ
20kΩ
40kΩ
OUT
IN
VOUT = 2VIN
AD8278
Figure 57. Noninverting Amplifier, Gain = 2
Table 10. AD8278 Difference and Single-Ended Amplifier Configurations
Amplifier Configuration
Signal Gain
Pin 1 (REF)
Pin 2 (VIN−)
Pin 3 (VIN+)
Pin 5 (SENSE)
Difference Amplifier
+½
GND
IN−
IN+
OUT
Difference Amplifier
+2
IN+
OUT
GND
IN−
Single-Ended Inverting Amplifier
−½
GND
IN
GND
OUT
Single-Ended Inverting Amplifier
−2
GND
OUT
GND
IN
Single-Ended Noninverting Amplifier
+3⁄2
IN
GND
IN
OUT
Single-Ended Noninverting Amplifier
+3
IN
OUT
IN
GND
Single-Ended Noninverting Amplifier
+½
GND
GND
IN
OUT
Single-Ended Noninverting Amplifier
+1
IN
GND
GND
OUT
Single-Ended Noninverting Amplifier
+1
GND
OUT
IN
GND
Single-Ended Noninverting Amplifier
+2
IN
OUT
GND
GND



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