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| 型号： | ADA4891-1ARJZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R CMOS SOT23-5 |
| 标准包装： | 1 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 210 V/µs |
| -3db带宽： | 240MHz |
| 电流 - 输入偏压： | 2pA |
| 电压 - 输入偏移： | 2500µV |
| 电流 - 电源： | 4.4mA |
| 电流 - 输出 / 通道： | 125mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | ADA4891-1ARJZ-R7DKR |
Data Sheet
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Rev. E | Page 15 of 24
APPLICATIONS INFORMATION
USING THE ADA4891
Understanding the subtleties of the ADA4891 family of amplifiers
provides insight into how to extract the peak performance from
the device. The following sections describe the effect of gain,
component values, and parasitics on the performance of the
ADA4891. The wideband, noninverting gain configuration of
the ADA4891 is shown in Figure 50; the wideband, inverting
gain configuration of the ADA4891 is shown in Figure 51.
WIDEBAND, NONINVERTING GAIN OPERATION
08054-
023
ADA4891
RF
RG
RT
50
SOURCE
RL
+VS
–VS
10F
0.1F
VI
VO
10F
0.1F
Figure 50. Noninverting Gain Configuration
respectively. Together, RF and RG determine the noise gain of the
amplifier. The value of RF defines the 0.1 dB bandwidth (for
more information, see the Effect of RF on 0.1 dB Gain Flatness
section). Typical RF values range from 549 Ω to 698 Ω for the
ADA4891-1/ADA4891-2. Typical RF values range from 301 Ω
to 453 Ω for the ADA4891-3/ADA4891-4.
In a controlled impedance signal path, RT is used as the input
termination resistor designed to match the input source imped-
ance. Note that RT is not required for normal operation. RT is
generally set to match the input source impedance.
WIDEBAND, INVERTING GAIN OPERATION
08054-
024
ADA4891
RF
RT
RG
50
SOURCE
RL
+VS
–VS
VI
VO
10F
0.1F
10F
0.1F
Figure 51. Inverting Gain Configuration
Figure 51 shows the inverting gain configuration. For the
inverting gain configuration, set the parallel combination of
RT and RG to match the input source impedance.
Note that a bias current cancellation resistor is not required in
the noninverting input of the amplifier because the input bias
current of the ADA4891 is very low (less than 2 pA). Therefore,
the dc errors caused by the bias current are negligible.
For both noninverting and inverting gain configurations, it is
often useful to increase the RF value to decrease the load on the
output. Increasing the RF value improves harmonic distortion at
the expense of reducing the 0.1 dB bandwidth of the amplifier.
This effect is discussed further in the Effect of RF on 0.1 dB Gain
Flatness section.
RECOMMENDED VALUES
Table 5 and Table 6 provide a quick reference for various configu-
rations and show the effect of gain on the 3 dB small-signal
bandwidth, slew rate, and peaking of the ADA4891-1/ADA4891-2/
ADA4891-3/ADA4891-4. Note that as the gain increases, the
small-signal bandwidth decreases, as is expected from the gain
bandwidth product relationship. In addition, the phase margin
improves with higher gains, and the amplifier becomes more
stable. As a result, the peaking in the frequency response is
reduced (see Figure 7 and Figure 10).
Table 5. Recommended Component Values and Effect of Gain on ADA4891-1/ADA4891-2 Performance (RL = 1 k)
Feedback Network Values
3 dB Small-Signal Bandwidth (MHz)
Slew Rate (V/s)
Peaking (dB)
Gain
RF ()
RG ()
VOUT = 200 mV p-p
tR
tF
1
604
118
188
192
1.3
+1
0
Open
240
154
263
2.6
+2
604
120
170
210
1.4
+5
604
151
32.5
149
154
0
+10
604
67.1
12.7
71
72
0
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| ADA4891-1ARJZ-RL | 功能描述:IC OPAMP GP R-R CMOS SOT23-5 RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| ADA4891-1ARZ | 功能描述:IC OPAMP GP RR CMOS 220MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°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:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| ADA4891-1ARZ-R7 | 功能描述:IC OPAMP GP R-R CMOS 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| ADA4891-1ARZ-RL | 功能描述:IC OPAMP GP R-R CMOS 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| ADA4891-1WARJZ-R7 | 功能描述:General Purpose Amplifier 1 Circuit Rail-to-Rail SOT-23-5 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 放大器类型:通用 电路数:1 输出类型:满摆幅 压摆率:210 V/μs 增益带宽积:- -3db 带宽:240MHz 电流 - 输入偏置:2pA 电压 - 输入失调:2.5mV 电流 - 电源:4.4mA 电流 - 输出/通道:125mA 电压 - 电源，单/双（±）:2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:3,000 |
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