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AD8278ARMZ-R7 Datasheet(PDF) 18 Page - Analog Devices

Part # AD8278ARMZ-R7
Description  Low Power, Wide Supply Range, Low Cost Difference Amplifier, G = 쩍, 2
PDF  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8278ARMZ-R7 Datasheet(HTML) 18 Page - Analog Devices

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AD8278
Rev. 0 | Page 18 of 24
APPLICATIONS INFORMATION
CONFIGURATIONS
The AD8278 can be configured in several ways, as a difference
amplifier or a single-ended amplifier (see Figure 48 to Figure 54).
All of these configurations have excellent gain accuracy and
gain drift because they rely on the internal matched resistors.
Note that Figure 50 shows the AD8278 as a difference amplifier
with a midsupply reference voltage at the noninverting input.
This allows the AD8278 to be used as a level shifter, which is
appropriate in single-supply applications that are referenced
to midsupply. Table 9 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−)
Figure 48. Difference Amplifier, Gain = ½
20kΩ
5
1
2
3
6
40kΩ
20kΩ
40kΩ
–IN
OUT
+IN
VOUT = 2(VIN+ − VIN−)
Figure 49. Difference Amplifier, Gain = 2
40kΩ
2
3
5
1
VREF = MIDSUPPLY
6
20kΩ
40kΩ
20kΩ
–IN
OUT
+IN
VOUT = ½(VIN+ − VIN−) + VREF
Figure 50. 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
Figure 51. Difference Amplifier, Gain = 2, Referenced to Midsupply
40kΩ
2
3
5
1
6
20kΩ
40kΩ
20kΩ
IN
OUT
VOUT = –½VIN
Figure 52. Inverting Amplifier, Gain = −½
40kΩ
25
6
20kΩ
IN
OUT
3
1
40kΩ
20kΩ
VOUT = 1.5VIN
Figure 53. Noninverting Amplifier, Gain = 1.5
20kΩ
2
3
5
1
6
40kΩ
20kΩ
40kΩ
OUT
IN
VOUT = 2VIN
Figure 54. Noninverting Amplifier, Gain = 2
Table 9. 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 Non Inverting Amplifier
+3⁄2
IN
GND
IN
OUT
Single-Ended Non Inverting Amplifier
+3
IN
OUT
IN
GND
Single-Ended Non Inverting Amplifier
+½
GND
GND
IN
OUT
Single-Ended Non Inverting Amplifier
+1
IN
GND
GND
OUT
Single-Ended Non Inverting Amplifier
+1
GND
OUT
IN
GND
Single-Ended Non Inverting Amplifier
+2
IN
OUT
GND
GND



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