参数资料
| 型号： | ADA4891-4ARZ-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 14SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 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： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4891-4ARZ-RL | 功能描述:IC OPAMP GP R-R CMOS 14SOIC 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:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 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-SO 包装:带卷 (TR) |
| ADA4891-4WARUZ-R7 | 功能描述:高速运算放大器 Lw Cst CMOS Hgh Spd RR Amp Quad RoHS:否 制造商:NXP Semiconductors 通道数量: 电压增益 dB: 输入补偿电压: 转换速度: 工作电源电压: 电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SO-20 封装:Tube 产品: |
| ADA4895-1ARJZ-R2 | 功能描述:IC OPAMP GP 236MHZ RRO SOT23-6 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 放大器类型:通用 电路数:1 输出类型:满摆幅 压摆率:943 V/μs -3db 带宽:236MHz 电流 - 输入偏置:11μA 电压 - 输入失调:53μV 电流 - 电源:3mA 电压 - 电源，单/双（±）:3 V ~ 10 V，±1.5 V ~ 5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商器件封装:SOT-23-6 标准包装:1 |
| ADA4895-1ARJZ-R7 | 功能描述:高速运算放大器 6Lead SOT23 Decomp L/N L/P Op Amp Single RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 产品: |
| ADA4895-1ARJZ-RL | 功能描述:高速运算放大器 6Lead SOT23 Decomp L/N L/P Op Amp Single RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 产品: |
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