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參數(shù)資料
| 型號： | AD8277BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/20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(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)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(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
Data Sheet
AD8276/AD8277
Rev. C | Page 17 of 20
The differential output voltage and common-mode voltage of
the AD8226 is shown in the following equations:
VDIFF_OUT = V+OUT VOUT = GainAD8226 × (V+IN – VIN)
VCM = (VS+ VS)/2 = VBIAS
Refer to the AD8226 data sheet for additional information.
07692-
056
2
12
3
14
13
11
40k
+VS
–IN
+IN
+OUT
40k
AD8277
6
10
5
8
9
4
40k
–VS
40k
–OUT
Figure 48. AD8277 Differential Output Configuration
The two difference amplifiers of the AD8277 can be configured
to provide a differential output, as shown in Figure 48. This
differential output configuration is suitable for various applications,
such as strain gage excitation and single-ended-to-differential
conversion. The differential output voltage has a gain of 2 as
shown in the following equation:
VDIFF_OUT = V+OUT VOUT = 2 × (V+IN – VIN)
CURRENT SOURCE
The AD8276 difference amplifier can be implemented as part
of a voltage-to-current converter or a precision constant current
source as shown in Figure 49. Using an integrated precision
solution such as the AD8276 provides several advantages over
a discrete solution, including space-saving, improved gain accuracy,
and temperature drift. The internal resistors are tightly matched
to minimize error and temperature drift. If the external resistors,
R1 and R2, are not well-matched, they become a significant
source of error in the system, so precision resistors are recom-
mended to maintain performance. The ADR821 provides a
precision voltage reference and integrated op amp that also
reduces error in the signal chain.
The AD8276 has rail-to-rail output capability that allows higher
current outputs.
REF
1
2
3
4
5
10
9
8
7
6
V–
V+
ADR821
40k
RLOAD
R1
R2
2N3904
40k
V+
7
4
5
6
2
3
1
AD8276
–2.5V
IO = 2.5V(1/40k + 1/R1)
R1 = R2
07692-
046
Figure 49. Constant Current Source
VOLTAGE AND CURRENT MONITORING
Voltage and current monitoring is critical in the following
applications: power line metering, power line protection, motor
control applications, and battery monitoring. The AD8276/
AD8277 can be used to monitor voltages and currents in a
system, as shown in Figure 50. As the signals monitored by the
AD8276/AD8277 rise above or drop below critical levels, a
circuit event can be triggered to correct the situation or raise
a warning.
OP1177
07692-
057
I1
R
AD8276
I3
IC
R
AD8276
V1
R
AD8276
V3
R
AD8276
VC
R
AD8276
8:1
ADC
Figure 50.Voltage and Current Monitoring in 3-Phase Power Line Protection
Using the AD8276
Figure 50 shows an example of how the AD8276 can be used to
monitor voltage and current on a 3-phase power supply. I1
through I3 are the currents to be monitored, and V1 through V3
are the voltages to be monitored on each phase. IC and VC are
the common or zero lines. Couplers or transformers interface
the power lines to the front-end circuitry and provide
attenuation, isolation, and protection.
On the current monitoring side, current transformers (CTs)
step down the power-line current and isolate the front-end
circuitry from the high voltage and high current lines. Across
the inputs of each difference amplifier is a shunt resistor that
converts the coupled current into a voltage. The value of the
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