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參數(shù)資料
| 型號： | OP470EY |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP 6MHZ QUAD LN 14CDIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 4 |
| 轉(zhuǎn)換速率： | 2 V/µs |
| 增益帶寬積： | 6MHz |
| 電流 - 輸入偏壓： | 6nA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 9mA |
| 電壓 - 電源，單路/雙路(±)： | 9 V ~ 36 V，±4.5 V ~ 18 V |
| 工作溫度： | -25°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 14-CDIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 14-CERDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 772 (CN2011-ZH PDF) |
REV. B
OP470
–12–
CAPACITIVE LOAD DRIVING AND POWER
SUPPLY CONSIDERATIONS
The OP470 is unity-gain stable and is capable of driving large
capacitive loads without oscillating. Nonetheless, good supply
bypassing is highly recommended. Proper supply bypassing
reduces problems caused by supply line noise and improves the
capacitive load driving capability of the OP470.
In the standard feedback amplifier, the op amp’s output resistance
combines with the load capacitance to form a low pass filter that
adds phase shift in the feedback network and reduces stability.
A simple circuit to eliminate this effect is shown in Figure 11.
The added components, C1 and R3, decouple the amplifier
from the load capacitance and provide additional stability. The
values of C1 and R3 shown in Figure 11 are for a load capaci-
tance of up to 1000 pF when used with the OP470.
R1
100 *
*
SEE TEXT
R3
50
OP470
C5
0.1 F
*
C4
10 F
+
V–
VOUT
CL
1000pF
C1
1000pF
R2
VIN
PLACE SUPPLY DECOUPLING
CAPACITORS AT OP470
C3
0.1 F
C2
10 F
+
V+
Figure 11. Driving Large Capacitive Loads
In applications where the OP470’s inverting or noninverting
inputs are driven by a low source impedance (under 100
W) or
connected to ground, if V+ is applied before V–, or when V is
disconnected, excessive parasitic currents will flow. Most applica-
tions use dual tracking supplies and with the device supply pins
properly bypassed, power-up will not present a problem. A source
resistance of at least 100
W in series with all inputs (Figure 11)
will limit the parasitic currents to a safe level if V– is discon-
nected. It should be noted that any source resistance, even 100
W,
adds noise to the circuit. Where noise is required to be kept at a
minimum, a germanium or Schottky diode can be used to clamp
the V- pin and eliminate the parasitic current flow instead of
using series limiting resistors. For most applications, only one
diode clamp is required per board or system.
UNITY-GAIN BUFFER APPLICATIONS
When Rf
100 W and the input is driven with a fast, large
signal pulse(> 1 V), the output waveform will look as shown
in Figure 12.
2V/ s
OP470
R1
Figure 12. Pulsed Operation
During the fast feedthrough-like portion of the output, the input
protection diodes effectively short the output to the input, and a
current, limited only by the output short-circuit protection, will
be drawn by the signal generator. With Rf
500 W, the output
is capable of handling the current requirements (IL < 20 mA at
10 V); the amplifier will stay in its active mode and a smooth
transition will occur.
When Rf > 3 k
W, a pole created by Rf and the amplifier’s input
capacitance (2 pF) creates additional phase shift and reduces
phase margin. A small capacitor (20 pF to 50 pF) in parallel
with Rf helps eliminate this problem.
APPLICATIONS
Low Noise Amplifier
A simple method of reducing amplifier noise by paralleling
amplifiers is shown in Figure 13. Amplifier noise, depicted in
Figure 14, is around 2 nV/
÷Hz @ 1 kHz (R.T.I.). Gain for each
paralleled amplifier and the entire circuit is 1000. The 200
W
resistors limit circulating currents and provide an effective out-
put resistance of 50
W. The amplifier is stable with a 10 nF
capacitive load and can supply up to 30 mA of output drive.
R2
50k
1/4
OP470E
+15V
–15V
R3
200
R1
50
VIN
R5
50k
1/4
OP470E
R6
200
R4
50
R8
50k
1/4
OP470E
R9
200
R7
50
R11
50k
1/4
OP470E
R12
200
R10
50
VOUT = 1000VIN
Figure 13. Low Noise Amplifier
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-470EY | 制造商:AD 制造商全稱:Analog Devices 功能描述:VERY LOW NOISE QUAD OPERATIONAL AMPLIFIER |
| OP470FY | 制造商:Analog Devices 功能描述: |
| OP-470FY | 制造商:AD 制造商全稱:Analog Devices 功能描述:VERY LOW NOISE QUAD OPERATIONAL AMPLIFIER |
| OP470G | 制造商:Analog Devices 功能描述: |
| OP-470G | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers |
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