參數(shù)資料
型號(hào)： 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(yùn)放)
中文描述： CMOS單電源軌到軌輸入/輸出運(yùn)算放大器（單電源滿幅度輸入輸出雙運(yùn)放）
文件頁(yè)數(shù)： 13/16頁(yè)
文件大?。?/td> 218K
代理商： OP250
OP250/OP450
REV. 0
–13–
1/2
OP250
20
50k
270 F
LEFT
HEADPHONE
10 F
50k
50k
100k
10 F
LEFT
INPUT
+V + 5V
1/2
OP250
20
50k
270 F
RIGHT
HEADPHONE
10 F
50k
50k
100k
10 F
RIGHT
INPUT
+V
+V + 5V
1 F/0.1 F
Figure 37. A Single-Supply Stereo Headphone Driver
FREQUENCY – Hz
1
0.1
0.00120
20k
100
T
1k
0.01
10k
V
SY
= 2.5V
A
V
= +1
V
IN
= 300mV
rms
R
L
= 500
R
L
= 2k
R
L
≥
10k
Figure 38. THD vs. Frequency
Headphone Driver
T he audio signal is coupled into each input through a 10
μ
F ca-
pacitor. T his large value insures the resulting high pass filter
cutoff is below 20 Hz, preserving full audio fidelity. If the input
already has the proper dc bias, then the coupling capacitor and
biasing resistors are not required. A 270
μ
F capacitor is used at
the output to couple the amplifier to the headphone speaker.
T his value is much larger than the input capacitor because of
the low impedance of the headphones, which can range from
32
to 600
or more. An additional 20
resistor is used in
series with the output capacitor to protect the op amp’s output
in the event the output accidentally becomes shorted to ground.
Direct Access Arrangement for Modems
Figure 39 illustrates a +5 V transmit/receive telephone line inter-
face for 600
systems. It allows full duplex transmission of sig-
nals on a transformer coupled 600
line in a differential manner.
Amplifier A1 provides gain which can be adjusted to meet the
modem output drive requirements. Both A1 and A2 are config-
ured so as to apply the largest possible signal on a single supply to
the transformer. Because of the OP450’s high output current
drive and low dropout voltages, the largest signal available on a
single +5 V supply is approximately 4.5 V p-p into a 600
trans-
mission system. Amplifier A3 is configured as a difference ampli-
fier for two reasons: (1) It prevents the transmit signal from
interfering with the receive signal and (2) it extracts the receive
signal from the transmission line for amplification by A4. Ampli-
fier A4’s gain can be adjusted in the same manner as A1’s to meet
the modem’s input signal requirements. Standard resistor values
permit the use of SIP (Single In-line Package) format resistor ar-
rays. Couple this with the OP450 14-lead T SSOP or SOIC foot-
print and this circuit offers a compact, cost-effective solution.
6.2V
6.2V
TRANSMIT
TXA
RECEIVE
RXA
C1
0.1 F
R1
10k
R2
9.09k
2k
P1
TX GAIN
ADJUST
A1
A2
A3
A4
A1, A2, A3, A4 = 1/4 OP450
R3
360
1:1
T1
TO TELEPHONE
LINE
1
2
3
7
6
5
2
3
1
6
5
7
10 F
R7
10k
R8
10k
R5
10k
R6
10k
R9
10k
R14
14.3k
R10
10k
R11
10k
R12
10k
R13
10k
C2
0.1 F
P2
RX GAIN
ADJUST
2k
Z
O
600
+5V DC
MIDCOM
671-8005
Figure 39. A Single-Supply Direct Access Arrangement for
Modems
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OP250 制造商:TT Electronics / OPTEK Technology 功能描述:IR Emitting Diode
OP250G4 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wideband, Unity-Gain Stable, FET-Input OPERATIONAL AMPLIFIER
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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