- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄373973 > ADA4000-4ARUZ-RL (ANALOG DEVICES INC) Low Cost, Precision JFET Input Operational Amplifiers PDF資料下載
參數(shù)資料
| 型號(hào)： | ADA4000-4ARUZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low Cost, Precision JFET Input Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 3000 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDSO14 |
| 封裝： | ROHS COMPLIANT, MO-153AB-1, TSSOP-14 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大小： | 381K |
| 代理商： | ADA4000-4ARUZ-RL |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)當(dāng)前第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
ADA4000-1/ADA4000-2/ADA4000-4
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.
Rev. 0 | Page 10 of 16
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
n
nTOTAL
R
i
e
e
4
S
kTR
2
2
+
+
=
where:
e
n
is the input voltage noise density of the part.
i
n
is the input current noise density of the part.
R
S
is the source resistance at the noninverting terminal.
k
is Boltzmann’s constant (1.38 × 10
23
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
R
S
C
S
C
L
500pF
R
L
10k
0
SNUBBER NETWORK
400mV p-p
0
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 R
S
is out of the feedback
network, and the gain accuracy does not change. Depending on
the capacitive loading of the circuit, the values of R
S
and C
S
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.
0
TIME (1μs/DIV)
V
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
eliminated, as shown in Figure 32. In this circuit, R
S
is 41 Ω and
C
S
is 10 nF.
0
TIME (1μs/DIV)
V
INPUT SIGNAL
OUTPUT SIGNAL
Figure 32. Capacitive Load with Snubber Network
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADA4000-4ARZ | Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4000-4ARZ-R7 | Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4000-4ARZ-RL | Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4004-4 | 1.8 nV/root Hz, 36 V Precision Quad Amplifier |
| ADA4004-4ACPZ-R2 | 1.8 nV/root Hz, 36 V Precision Quad Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4000-4ARUZ-RL1 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4000-4ARZ | 功能描述:IC OPAMP JFET 5MHZ QUAD 14SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱(chēng):LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| ADA4000-4ARZ1 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Cost, Precision JFET Input Operational Amplifiers |
| ADA4000-4ARZ-R7 | 功能描述:IC OPAMP JFET 5MHZ QUAD 14SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類(lèi)型:電流檢測(cè) 電路數(shù):1 輸出類(lèi)型:- 轉(zhuǎn)換速率:- 增益帶寬積:125kHz -3db帶寬:- 電流 - 輸入偏壓:- 電壓 - 輸入偏移:100µV 電流 - 電源:1.1µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:4-WFBGA，CSPBGA 供應(yīng)商設(shè)備封裝:4-UCSP（2x2） 包裝:剪切帶 (CT) 其它名稱(chēng):MAX9634WERS+TCT |
| ADA4000-4ARZ-R71 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Cost, Precision JFET Input Operational Amplifiers |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。