参数资料
| 型号： | AD8208WBRZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF PREC 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 转换速率： | 1 V/µs |
| 增益带宽积： | 70kHz |
| 电流 - 输入偏压： | 50nA |
| 电压 - 输入偏移： | 2000µV |
| 电流 - 电源： | 1.6mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
Data Sheet
AD8208
Rev. C | Page 13 of 20
4 mA to 20 mA Current Loop Receiver
The AD8208 can also be used in low current-sensing applica-
tions, such as the 4 mA to 20 mA current loop receiver shown
in Figure 29. In such applications, the relatively large shunt
resistor may degrade the common-mode rejection. Adding a
resistor of equal value on the low impedance side of the input
corrects this error.
GND
NC
–IN
+IN
A1
VS
A2
OUT
AD8208
BATTERY
10
1%
10
1%
NC = NO CONNECT
08714-
028
CF
OUTPUT
5V
+
–
Figure 29. 4 mA to 20 mA Current Loop Receiver
GAIN ADJUSTMENT
The default gain of the preamplifier and buffer are 10 V/V and
2 V/V, respectively, resulting in a composite gain of 20 V/V. With
the addition of external resistor(s) or trimmer(s), the gain can
be lowered, raised, or finely calibrated.
Gains Less than 20
Because the preamplifier has an output resistance of 100 k, an
external resistor connected from Pin 3 and Pin 4 to GND decreases
the gain by the following factor (see Figure 30):
REXT/(100 k + REXT)
GND
NC
–IN
+IN
A1
VS
A2
OUT
AD8208
VDIFF
VCM
NC = NO CONNECT
08714-
029
REXT
OUTPUT
GAIN =
20REXT
REXT + 100k
5V
REXT = 100k
GAIN
20 – GAIN
+
–
+
–
Figure 30. Adjusting for Gains Less than 20
The overall bandwidth is unaffected by changes in gain by using
this method, although there may be a small offset voltage due to
the imbalance in source resistances at the input to the buffer. In
many cases, this can be ignored, but if desired, the offset voltage can
be nulled by inserting a resistor in series with Pin 4. The resistor
used should be equal to 100 k minus the parallel sum of REXT
and 100 k. For example, with REXT = 100 k (yielding a composite
gain of 10 V/V), the optional offset nulling resistor is 50 k.
Gains Greater than 20
Connecting a resistor from the output of the buffer amplifier to
its noninverting input, as shown in Figure 31, increases the gain.
The gain is now multiplied by the factor
REXT/(REXT 100 k)
For example, it is doubled for REXT = 200 k. Overall gains as
high as 50 are achievable in this way. Note that the accuracy of
the gain becomes critically dependent on the resistor value at
high gains. In addition, the effective input offset voltage at Pin 1
and Pin 8 (which is about six times the actual offset of A1) limits
the use of the part in high gain, dc-coupled applications.
GND
NC
–IN
+IN
A1
VS
A2
OUT
AD8208
VDIFF
VCM
NC = NO CONNECT
08714-
030
REXT
OUTPUT
GAIN =
20REXT
REXT – 100k
5V
REXT = 100k
GAIN
GAIN – 20
+
–
+
–
Figure 31. Adjusting for Gains Greater than 20
GAIN TRIM
Figure 32 shows a method for incremental gain trimming by
using a trim potentiometer and an external resistor, REXT.
The following approximation is useful for small gain ranges:
ΔG ≈ (10 M ÷ REXT)%
For example, using this equation, the adjustment range is ±2%
for REXT = 5 M and ±10% for REXT = 1 M.
GND
NC
–IN
+IN
A1
VS
A2
REXT
OUT
AD8208
5V
VDIFF
VCM
NC = NO CONNECT
08714-
031
OUTPUT
GAIN TRIM
20k MIN
+
–
+
–
Figure 32. Incremental Gain Trimming
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8208WBRZ-RL | 功能描述:IC AMP DIFF PREC 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| AD8208WHRMZ | 功能描述:Differential Amplifier 1 Circuit 8-MSOP 制造商:analog devices inc. 系列:- 包装:管件 零件状态:有效 放大器类型:差分 电路数:1 输出类型:- 压摆率:1 V/μs 增益带宽积:70kHz -3db 带宽:- 电流 - 输入偏置:50nA 电压 - 输入失调:2mV 电流 - 电源:1.6mA 电流 - 输出/通道:- 电压 - 电源，单/双（±）:4.5 V ~ 5.5 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:50 |
| AD8208WHRMZ-RL | 功能描述:Differential Amplifier 1 Circuit 8-MSOP 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:在售 放大器类型:差分 电路数:1 输出类型:- 压摆率:1 V/μs 增益带宽积:70kHz -3db 带宽:- 电流 - 输入偏置:50nA 电压 - 输入失调:2mV 电流 - 电源:1.6mA 电流 - 输出/通道:- 电压 - 电源，单/双（±）:4.5 V ~ 5.5 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:3,000 |
| AD8208WHRZ | 功能描述:Differential Amplifier 1 Circuit 8-SOIC 制造商:analog devices inc. 系列:- 包装:管件 零件状态:有效 放大器类型:差分 电路数:1 输出类型:- 压摆率:1 V/μs 增益带宽积:70kHz -3db 带宽:- 电流 - 输入偏置:50nA 电压 - 输入失调:2mV 电流 - 电源:1.6mA 电流 - 输出/通道:- 电压 - 电源，单/双（±）:4.5 V ~ 5.5 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:98 |
| AD8208WHRZ-RL | 功能描述:Differential Amplifier 1 Circuit 8-SOIC 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 放大器类型:差分 电路数:1 输出类型:- 压摆率:1 V/μs 增益带宽积:70kHz -3db 带宽:- 电流 - 输入偏置:50nA 电压 - 输入失调:2mV 电流 - 电源:1.6mA 电流 - 输出/通道:- 电压 - 电源，单/双（±）:4.5 V ~ 5.5 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:2,500 |
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