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| 型号： | ADA4000-2ARMZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET 5MHZ DUAL LP 8MSOP |
| 标准包装： | 1 |
| 放大器类型： | J-FET |
| 电路数： | 2 |
| 转换速率： | 20 V/µs |
| 增益带宽积： | 5MHz |
| 电流 - 输入偏压： | 5pA |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 1.35mA |
| 电流 - 输出 / 通道： | 28mA |
| 电压 - 电源，单路/双路(±)： | 8 V ~ 36 V，±4 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 标准包装 |
| 其它名称： | ADA4000-2ARMZ-RLDKR |
ADA4000-1/ADA4000-2/ADA4000-4
Rev. A | Page 10 of 16
APPLICATIONS
OUTPUT PHASE REVERSAL AND INPUT NOISE
Phase reversal is a change of polarity in the transfer function of
the amplifier. This can occur when the voltage applied at the
input of the amplifier exceeds the maximum common-mode
voltage. Phase reversal happens when the part is configured in
the gain of 1.
Most JFET amplifiers invert the phase of the input signal if the
input exceeds the common-mode input. Phase reversal is a
temporary behavior of the ADA4000-x family. Each part
returns to normal operation by bringing back the common-
mode voltage. The cause of this effect is saturation of the input
stage, which leads to the forward-biasing of a drain-gate diode.
In noninverting applications, a simple fix for this is to insert a
series resistor between the input signal and the noninverting
terminal of the amplifier. The value of the resistor depends on
the application, because adding a resistor adds to the total input
noise of the amplifier. The total noise density of the circuit is
()
S
n
nTOTAL
kTR
R
i
e
4
2
+
=
where:
en
is the input voltage noise density of the part.
in
is the input current noise density of the part.
RS
is the source resistance at the noninverting terminal.
k
is Boltzmann’s constant (1.38 × 1023 J/K).
T
is the ambient temperature in Kelvin (T = 273 + °C).
In general, it is good practice to limit the input current to less
than 5 mA to avoid driving a great deal of current into the
amplifier inputs.
CAPACITIVE LOAD DRIVE
The ADA4000-1/ADA4000-2/ADA4000-4 are stable at all gains
in both inverting and noninverting configurations. The parts
are capable of driving up to 1000 pF of capacitive loads without
oscillations in unity gain configurations.
However, as with most amplifiers, driving larger capacitive loads
in a unity gain configuration can cause excessive overshoot and
ringing. A simple solution to this problem is to use a snubber
network (see Figure 30).
ADA4000-1
V+
V–
+15V
–15V
RS
CS
CL
500pF
RL
10k
0
SNUBBER NETWORK
400mV p-p
05
79
1-
03
1
0
V1
3
2
1
U1
Figure 30. Snubber Network Configuration
The advantage of this compensation method is that the swing at
the output is not reduced because RS is out of the feedback
network, and the gain accuracy does not change. Depending on
the capacitive loading of the circuit, the values of RS and CS
change, and the optimum value can be determined empirically.
In Figure 31, the oscilloscope image shows the output of the
ADA4000-x family in response to a 400 mV pulse. The circuit is
configured in the unity gain configuration with 500 pF in
parallel with 10 kΩ of load capacitive.
05
791
-03
2
TIME (1s/DIV)
VO
L
T
A
G
E
(
20
0m
V/
D
IV
)
INPUT SIGNAL
OUTPUT SIGNAL
Figure 31. Capacitive Load Drive Without Snubber Network
When the snubber circuit is used, the overshoot is reduced from
30% to 6% with the same load capacitance. Ringing is virtually
CS is 10 nF.
05
79
1-
03
3
TIME (1s/DIV)
V
O
L
T
AG
E
(
200m
V
/DI
V
)
INPUT SIGNAL
OUTPUT SIGNAL
Figure 32. Capacitive Load with Snubber Network
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4000-2ARMZ-RL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4000-2ARZ | 功能描述:IC OPAMP JFET 5MHZ DUAL LP 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| ADA4000-2ARZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4000-2ARZ-R7 | 功能描述:IC OPAMP JFET 5MHZ DUAL LP 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°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) |
| ADA4000-2ARZ-R71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost, Precision JFET Input Operational Amplifiers |
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