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參數資料
| 型號： | AD8277BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 8/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP GP UNITY GAIN DIFF 14SOIC |
| 標準包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 1.1 V/µs |
| 增益帶寬積： | 550kHz |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 200µA |
| 電流 - 輸出 / 通道： | 15mA |
| 電壓 - 電源，單路/雙路(±)： | 2 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
AD8276/AD8277
Data Sheet
Rev. C | Page 16 of 20
APPLICATIONS INFORMATION
CONFIGURATIONS
The AD8276/AD8277 can be configured in several ways (see
Figure 42 to Figure 46). All of these configurations have excellent
gain accuracy and gain drift because they rely on the internal
matched resistors. Note that Figure 43 shows the AD8276/AD8277
as difference amplifiers with a midsupply reference voltage at
the noninverting input. This allows the AD8276/AD8277 to be
used as a level shifter, which is appropriate in single-supply
applications that are referenced to midsupply.
As with the other inputs, the reference must be driven with a
low impedance source to maintain the internal resistor ratio. An
example using the low power, low noise OP1177 as a reference
is shown in Figure 41.
INCORRECT
V
CORRECT
AD8276
OP1177
+
–
V
REF
AD8276
REF
07692-
037
Figure 41. Driving the Reference Pin
40k
2
3
5
1
6
40k
–IN
OUT
+IN
VOUT = VIN+ VIN
07692-
038
Figure 42. Difference Amplifier, Gain = 1
40k
2
3
5
1
VREF = MIDSUPPLY
6
40k
–IN
OUT
+IN
VOUT = VIN+ VIN
07692-
039
Figure 43. Difference Amplifier, Gain = 1, Referenced to Midsupply
40k
2
3
5
1
6
40k
IN
OUT
VOUT = –VIN
07692-
040
Figure 44. Inverting Amplifier, Gain = 1
40k
5
1
2
3
6
40k
OUT
IN
VOUT = VIN
07692-
041
Figure 45. Noninverting Amplifier, Gain = 1
40k
2
5
6
40k
IN
OUT
3
1
40k
VOUT = 2VIN
07692-
042
Figure 46. Noninverting Amplifier, Gain = 2
DIFFERENTIAL OUTPUT
Certain systems require a differential signal for better perfor-
mance, such as the inputs to differential analog-to-digital
converters. Figure 47 shows how the AD8276/AD8277 can
be used to convert a single-ended output from an AD8226
instrumentation amplifier into a differential signal. The internal
matched resistors of the AD8276 at the inverting input maximize
gain accuracy while generating a differential signal. The resistors at
the noninverting input can be used as a divider to set and track
the common-mode voltage accurately to midsupply, especially
when running on a single supply or in an environment where
the supply fluctuates. The resistors at the noninverting input
can also be shorted and set to any appropriate bias voltage. Note
the AD8276 because it is not pinned out.
07692-
043
AD8276
AD8226
VREF
+IN
–IN
R
VS–
VS+
–OUT
+OUT
VBIAS = VCM
Figure 47. Differential Output With Supply Tracking on Common-Mode
Voltage Reference
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