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AD8270 Datasheet(PDF) 15 Page - Analog Devices

Part No. AD8270
Description  Precision Dual-Channel Difference Amplifier
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8270 Datasheet(HTML) 15 Page - Analog Devices

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Data Sheet
AD8270
Rev. A | Page 15 of 20
APPLICATIONS INFORMATION
DIFFERENCE AMPLIFIER CONFIGURATIONS
The AD8270 can be placed in difference amplifier configurations
with gains of 0.5, 1, and 2. Figure 42 through Figure 44 show the
difference amplifier configurations, referenced to ground. The
AD8270 can also be referred to a combination of reference
voltages. For example, the reference could be set at 2.5 V,
using just 5 V and GND. Some of the possible configurations
are shown in Figure 45 through Figure 47.
The layout for Channel A is shown in Figure 42 through Figure 47.
The layout for Channel B is symmetrical. Table 7 shows the pin
connections for Channel A and Channel B.
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
20kΩ 20kΩ
1
2
3
4
16
15
56
=
–IN
+IN
–IN
+IN
5kΩ
5kΩ
10kΩ
10kΩ
GND
GND
Figure 42. Gain = 0.5 Difference Amplifier, Referenced to Ground
=
–IN
+IN
10kΩ
10kΩ
10kΩ
10kΩ
GND
–IN
+IN
GND
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
20kΩ 20kΩ
1
2
3
4
16
15
56
NC
NC
NC = NO CONNECT
Figure 43. Gain = 1 Difference Amplifier, Referenced to Ground
10kΩ
=
–IN
+IN
10kΩ
5kΩ
5kΩ
10kΩ
GND
–IN
+IN
GND
10kΩ
10kΩ
10kΩ
10kΩ
20kΩ 20kΩ
1
2
3
4
16
15
56
Figure 44. Gain = 2 Difference Amplifier, Referenced to Ground
SINGLE-ENDED CONFIGURATIONS
The AD8270 can be configured for a wide variety of single-ended
configurations with gains ranging from −2 to +3. Table 8 shows
a subset of the possible configurations.
Many signal gains have more than one configuration choice,
which allows freedom in choosing the op amp closed-loop gain.
In general, for designs that need to be stable with a large capacitive
load on the output, choose a configuration with high loop gain.
Otherwise, choose a configuration with low loop gain, because
these configurations typically have lower noise, lower offset,
and higher bandwidth.
+VS + –VS
2
–IN
+IN
–VS
+VS
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
20kΩ 20kΩ
1
2
3
4
16
15
56
=
–IN
+IN
5kΩ
5kΩ
10kΩ
10kΩ
Figure 45. Gain = 0.5 Difference Amplifier, Referenced to Midsupply
=
–IN
+IN
10kΩ
10kΩ
10kΩ
10kΩ
+VS + –VS
2
–IN
+IN
–VS +VS
NC
NC
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
20kΩ 20kΩ
1
2
3
4
16
15
56
NC = NO CONNECT
Figure 46. Gain = 1 Difference Amplifier, Referenced to Midsupply
=
–IN
+IN
10kΩ
5kΩ
5kΩ
10kΩ
+VS + –VS
2
–IN
+IN
–VS +VS
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
20kΩ 20kΩ
1
2
3
4
16
15
56
Figure 47. Gain = 2 Difference Amplifier, Referenced to Midsupply
Table 7. Pin Connections for Difference Amplifier Configurations
Channel A
Channel B
Gain and Reference
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 12
Pin 11
Pin 10
Pin 9
Pin 8
Pin 7
Gain of 0.5, Referenced to Ground
OUT
−IN
+IN
GND
GND
GND
OUT
−IN
+IN
GND
GND
GND
Gain of 0.5, Referenced to Midsupply
OUT
−IN
+IN
−VS
+VS
+VS
OUT
−IN
+IN
−VS
+VS
+VS
Gain of 1, Referenced to Ground
−IN
NC
NC
+IN
GND
GND
−IN
NC
NC
+IN
GND
GND
Gain of 1, Referenced to Midsupply
−IN
NC
NC
+IN
−VS
+VS
−IN
NC
NC
+IN
−VS
+VS
Gain of 2, Referenced to Ground
−IN
−IN
+IN
+IN
GND
GND
−IN
−IN
+IN
+IN
GND
GND
Gain of 2, Referenced to Midsupply
−IN
−IN
+IN
+IN
−VS
+VS
−IN
−IN
+IN
+IN
−VS
+VS


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