参数资料
| 型号： | AD845BQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET 16MHZ PREC 8CDIP |
| 标准包装： | 48 |
| 放大器类型： | J-FET |
| 电路数： | 1 |
| 转换速率： | 100 V/µs |
| 增益带宽积： | 16MHz |
| 电流 - 输入偏压： | 500pA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 10mA |
| 电流 - 输出 / 通道： | 50mA |
| 电压 - 电源，单路/双路(±)： | ±4.75 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-CERDIP |
| 包装： | 管件 |
AD845
REV. E
–7–
MEASURING AD845 SETTLING TIME
Figure 1 shows AD845 settling time performance. This measure-
ment was accomplished by driving the amplifier in the unity
gain inverting mode with a fast pulse generator. The input
summing junction was measured using false nulling techniques.
Settling time is defined as the interval of time from the application
of an ideal step function input until the closed-loop amplifier
output has entered and remains within a specified error band.
Components of settling time include:
1. Propagation time through the amplifier
2. Slewing time to approach the final output value
3. Recovery time from overload associated with the slewing
4. Linear settling to within a specified error band
These individual components can be seen easily in Figure 1.
Settling time is extremely important in high speed applications
where the current output of a DAC must be converted to a
voltage. When driving a 500
W load in parallel with a 100 pF
capacitor, the AD845 settles to 0.1% in 250 ns and to 0.01% in
310 ns.
Figure 1. Settling Characteristics 0 V to 10 V Step
Upper Trace: Output of AD845 Under Test (5 V/Div)
Lower Trace: Error Voltage (1 mV/Div)
Figure 2. Settling Time Test Circuit
A HIGH SPEED INSTRUMENTATION AMP
The 3-op amp instrumentation amplifier circuit shown in
Figure 3 can provide a range of gains from unity up to 1000 and
higher. The instrumentation amplifier configuration features
high common-mode rejection, balanced differential inputs, and
stable, accurately defined gain. Low input bias currents and fast
settling are achieved with the FET input AD845.
Most monolithic instrumentation amplifiers do not have the
high frequency performance of the circuit in Figure 3. The cir-
cuit bandwidth is 10.9 MHz at a gain of 1 and 8.8 MHz at a
gain of 10; settling time for the entire circuit is 900 ns to 0.01%
for a 10 V step (Gain = 10).
The capacitors employed in this circuit greatly improve the
amplifier’s settling time and phase margin.
Figure 3. High Performance, High Speed Instrumentation
Amplifier
Table I. Performance Summary for the 3-Op Amp
Instrumentation Amplifier Circuit
3-Op Amp In-Amp
Small Signal
Settling Time
Gain
RG
Bandwidth
to 0.01%
1Open
10.9 MHz
500 ns
22 k
W
8.8 MHz
500 ns
10
226
W
2.6 MHz
900 ns
100
20
W
290 kHz
7.5
ms
Note: Resistors around the amplifiers’ input pins need to be small enough in
value so that the RC time constant they form, with stray circuit capacitance,
does not reduce circuit bandwidth.
Figure 4. The Pulse Response of the 3-Op Amp
Instrumentation Amplifier. Gain = 1, Horizontal Scale =
0.5 ms/Div and Vertical Scale = 5 V/Div.
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相关代理商/技术参数 |
参数描述 |
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| AD845JCHIPS | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision, 16 MHz CBFET Op Amp |
| AD845JN | 功能描述:IC OPAMP JFET 16MHZ PREC 8DIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°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-SOIC 包装:带卷 (TR) |
| AD845JNZ | 功能描述:IC OPAMP JFET 16MHZ PREC 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD845JR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
| AD845JR-16 | 功能描述:IC OPAMP JFET 16MHZ PREC 16SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°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-SOIC 包装:带卷 (TR) |
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