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參數(shù)資料
| 型號： | OP250 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers(單電源滿幅度輸入輸出雙運放) |
| 中文描述： | CMOS單電源軌到軌輸入/輸出運算放大器（單電源滿幅度輸入輸出雙運放） |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 218K |
| 代理商： | OP250 |
OP250/OP450
REV. 0
–12–
be connected from the output to ground in parallel with the ca-
pacitive load as shown in Figure 33. T he proper snubber net-
work on the output can significantly reduce output overshoot,
although it will not increase the bandwidth. T able I shows some
snubber network values for a given capacitive load. In practice,
these values are best determined empirically based on the exact
capacitive load for the application.
+5V
R
S
5
V
OUT
V
IN
100mV p-p
OP250
C
47nF
C
1 F
Figure 33. Schematic for Using a Snubber Network
T able I. Snubber Network for Large Capacitive Loads
Load Capacitance (C
L
)
Snubber Network (RS, CS)
1 nF
10 nF
100 nF
60
, 30 nF
20
, 1
μ
F
3
, 10
μ
F
Figure 34 shows the output of an OP250 in a unity gain configu-
ration with a 1 nF capacitive load. Figure 35 shows the improve-
ment in the output response with the snubber network added.
2μs
50mV
C
L
= 1nF
R
L
= 10k
V
IN
= 100mV
p-p
@ 100kHz
Figure 34. Output of OP250 without Snubber Network
2μs
50mV
C
L
= 1nF
R
L
= 10k
V
IN
= 100mV
p-p
@ 100kHz
Figure 35. Output of OP250 with Snubber Network
For more information on methods to drive a capacitive load with
an op amp, please refer to the
Ask the Applications Engineer
ar-
ticle in
Analog Dialogue
, Vol. 31, Number 2, 1997.
Single Supply Differential Line Driver
Figure 36 shows a single supply differential line driver circuit
that can drive a 600
load with less than 0.1% distortion. T he
design uses an OP450 to mimic the performance of a fully bal-
anced transformer based solution. However, this design occupies
much less board space while maintaining low distortion and can
operate down to dc. Like the transformer based design, either
output can be shorted to ground for unbalanced line driver ap-
plications without changing the circuit gain of 1.
R
L
600
C1
22 F
A2
7
6
5
3
1
2
A1
+5V
R1
10k
R2
10k
R11
10k
R7
10k
6
7
5
A1
+12V
+5V
R8
100k
R9
100k
C2
1 F
R12
10k
R14
50
A2
1
2
3
R3
10k
R6
10k
R13
10k
C3
47 F
V
O1
V
O2
C4
47μF
A1, A2 = 1/2 OP250
GAIN =R2
SET: R7, R10, R11 = R2
SET: R6, R12, R13 = R3
V
IN
R10
10k
R5
50
Figure 36. A Low Noise, Single Supply Differential Line Driver
R8 and R9 set up the common mode output voltage equal to
half of the supply voltage. C1 is used to couple the input signal
and can be omitted if the input’s dc voltage is equal to half of
the supply voltage.
T he circuit can also be configured to provide additional gain if
desired. T he gain of the circuit is:
A
V
V
R
R
V
OUT
IN
=
=
3
2
(5)
Where:
V
OUT
=
V
O1
–
V
O2
,
R2 = R7 = R10 = R11 and,
R3 = R6 = R12 = R13
Multimedia Headphone Amplifier
Because of its large output drive, the OP250 makes an excellent
headphone amplifier, as illustrated in Figure 37. Its low supply
operation and rail-to-rail inputs and outputs can maximize out-
put signal swing on a single +5 V supply. In Figure 37, the am-
plifier inputs are biased halfway between the supply voltages,
which in this application is 2.5 V. A 10
μ
F capacitor prevents
power supply noise from contaminating the audio signal.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| OP250 | 制造商:TT Electronics / OPTEK Technology 功能描述:IR Emitting Diode |
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| OP250GBC | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifier |
| OP250GP | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifier |
| OP250GRU | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers |
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