参数资料
| 型号： | AD8208WBRZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF PREC 8SOIC |
| 标准包装： | 2,500 |
| 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 11 of 20
THEORY OF OPERATION
The AD8208 is a single-supply difference amplifier typically used
to amplify a small differential voltage in the presence of rapidly
changing, high common-mode voltages.
The AD8208 consists of two amplifiers (A1 and A2), a resistor
network, a small voltage reference, and a bias circuit (not shown);
The set of input attenuators preceding A1 consists of RA, RB, and
RC, which feature a combined series resistance of approximately
400 kΩ ± 20%. The purpose of these resistors is to attenuate the
input voltage to match the input voltage range of A1. This balanced
resistor network attenuates the common-mode signal by a ratio
of 1/14. The A1 amplifier inputs are held within the power supply
range, even as Pin 1 and Pin 8 exceed the supply or fall below the
common (ground). A reference voltage of 350 mV biases the
attenuator above ground, allowing Amplifier A1 to operate in
the presence of negative common-mode voltages.
The input resistor network also attenuates normal (differential)
mode voltages. Therefore, A1 features a gain of 140 V/V to provide
a total system gain, from ±IN to the output of A1, equal to 10
V/V, as shown in the following equation:
Gain (A1) = 1/14 (V/V) × 140(V/V) = 10 V/V
A precision trimmed, 100 kΩ resistor is placed in series with the
output of Amplifier A1. The user has access to this resistor via
an external pin (A1). A low-pass filter can be easily implemented
by connecting A1 to A2 and placing a capacitor to ground (see
The value of RF1 and RF2 is 10 kΩ, providing a gain of 2 V/V for
Amplifier A2. When connecting Pin A1 and Pin A2 together, the
AD8208 provides a total system gain equal to
Total Gain of (A1 + A2) (V/V) = 10 (V/V) × 2 (V/V) = 20 V/V
at the output of A2 (the OUT pin).
The ratios of RA, RB, RC, and RF are trimmed to a high level of
precision, allowing a typical CMRR value that exceeds 80 dB. This
performance is accomplished by laser trimming the resistor ratio
matching to better than 0.01%.
OUT
GND
VS
RC
RF
–IN
350mV
+
–
RB
RA
RC
RF
RG
RFILTER
RM
A1
A2
+IN
A1
A2
+
–
RF1
RF2
08714-
023
Figure 24. Simplified Schematic
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相关代理商/技术参数 |
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| 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 |
| AD8209 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Voltage, Precision Difference Amplifier |
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