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| 型號(hào)： | AD8270ACPZ-WP |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 7/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF 20MHZ DUAL 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 64 |
| 放大器類(lèi)型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類(lèi)型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 30 V/µs |
| 增益帶寬積： | 20MHz |
| 電流 - 輸入偏壓： | 500pA |
| 電壓 - 輸入偏移： | 450µV |
| 電流 - 電源： | 2.3mA |
| 電流 - 輸出 / 通道： | 100mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 36 V，±2.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤(pán)，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 托盤(pán) - 晶粒 |
| 產(chǎn)品目錄頁(yè)面： | 773 (CN2011-ZH PDF) |
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AD8270
Rev. 0 | Page 15 of 20
APPLICATIONS INFORMATION
DIFFERENCE AMPLIFIER CONFIGURATIONS
The AD8270 can be placed in difference amplifier configurations
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
The layout for Channel B is symmetrical. Table 7 shows the pin
connections for Channel A and Channel B.
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.
10k
20k 20k
1
2
3
4
16
15
56
=
–IN
+IN
–IN
+IN
5k
10k
GND
06
97
9-
0
53
Figure 42. Gain = 0.5 Difference Amplifier, Referenced to Ground
=
–IN
+IN
10k
GND
–IN
+IN
GND
10k
20k 20k
1
2
3
4
16
15
56
NC
NC = NO CONNECT
06
97
9-
0
54
Figure 43. Gain = 1 Difference Amplifier, Referenced to Ground
=
–IN
+IN
10k
5k
10k
GND
–IN
+IN
GND
10k
20k 20k
1
2
3
4
16
15
56
06
97
9-
05
5
Figure 44. Gain = 2 Difference Amplifier, Referenced to Ground
+VS + –VS
2
–IN
+IN
–VS
+VS
10k
20k 20k
1
2
3
4
16
15
56
=
–IN
+IN
5k
10k
06
97
9-
05
6
Figure 45. Gain = 0.5 Difference Amplifier, Referenced to Midsupply
=
–IN
+IN
10k
+VS + –VS
2
–IN
+IN
–VS +VS
NC
10k
20k 20k
1
2
3
4
16
15
56
NC = NO CONNECT
0
697
9-
0
57
Figure 46. Gain = 1 Difference Amplifier, Referenced to Midsupply
=
–IN
+IN
10k
5k
10k
+VS + –VS
2
–IN
+IN
–VS +VS
10k
20k 20k
1
2
3
4
16
15
56
06
97
9-
0
58
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
OUT
IN
+IN
GND
Gain of 0.5, Referenced to Midsupply
OUT
IN
+IN
VS
+VS
OUT
IN
+IN
VS
+VS
Gain of 1, Referenced to Ground
IN
NC
+IN
GND
IN
NC
+IN
GND
Gain of 1, Referenced to Midsupply
IN
NC
+IN
VS
+VS
IN
NC
+IN
VS
+VS
Gain of 2, Referenced to Ground
IN
+IN
GND
IN
+IN
GND
Gain of 2, Referenced to Midsupply
IN
+IN
VS
+VS
IN
+IN
VS
+VS
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