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| 型号： | OP262HRUZ-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运算放大器 |
| 英文描述： | 15 MHz Rail-to-Rail Operational Amplifier, Dual; Package: TSSOP; No of Pins: 8; Temperature Range: Industrial |
| 中文描述： | DUAL OP-AMP, 1000 uV OFFSET-MAX, 15 MHz BAND WIDTH, PDSO8 |
| 封装： | LEAD FREE, MS-153AA, TSSOP-8 |
| 文件页数： | 8/20页 |
| 文件大小： | 949K |
| 代理商： | OP262HRUZ-REEL |
OP162/OP262/OP462
Rev. F | Page 16 of 20
APPLICATION CIRCUITS
SINGLE-SUPPLY STEREO HEADPHONE DRIVER
Figure 46 shows a stereo headphone output amplifier that can
operate from a single 5 V supply. The reference voltage is
derived by dividing the supply voltage down with two 100 k
resistors. A 10 F capacitor prevents power supply noise from
contaminating the audio signal and establishes an ac ground for
the volume control potentiometers.
The audio signal is ac-coupled to each noninverting input
through a 10 F capacitor. The gain of the amplifier is con-
trolled by the feedback resistors and is (R2/R1) + 1. For this
example, the gain is 6. By removing R1, the amplifier would
have unity gain. To short-circuit protect the output of the
device, a 169 resistor is placed at the output in the feedback
network. This prevents any damage to the device if the head-
phone output becomes shorted. A 270 F capacitor is used at
the output to couple the amplifier to the headphone. This value
is much larger than that used for the input because of the low
impedance of headphones, which can range from 32 to 600
or more.
OP262-A
5V
169
270
F
47k
L VOLUME
CONTROL
R1 = 10k
10
F
10
F
10k
5V
100k
10
F
100k
R2 = 50k
LEFT IN
OP262-B
5V
169
270
F
47k
HEADPHONE
RIGHT
HEADPHONE
LEFT
10k
R VOLUME
CONTROL
10
F
RIGHT IN
R2 = 50k
10
F
R1 = 10k
00288-046
Figure 46. Headphone Output Amplifier
INSTRUMENTATION AMPLIFIER
Because of their high speed, low offset voltages, and low noise
characteristics, the OP162/OP262/OP462 can be used in a wide
variety of high speed applications, including precision instru-
mentation amplifiers. Figure 47 shows an example of such an
application.
OP462-A
OP462-B
OP462-C
OP462-D
–VIN
+VIN
1k
10k
2k
1.9k
200
10 TURN
(OPTIONAL)
OUTPUT
RG
1k
10k
2k
2k
00288-047
Figure 47. High Speed Instrumentation Amplifier
The differential gain of the circuit is determined by RG, where
G
DIFF
R
A
2
1 +
=
with the RG resistor value in k. Removing RG sets the circuit
gain to unity.
The fourth op amp, OP462-D, is optional and is used to
improve CMRR by reducing any input capacitance to the
amplifier. By shielding the input signal leads and driving the
shield with the common-mode voltage, input capacitance is
eliminated at common-mode voltages. This voltage is derived
from the midpoint of the outputs of OP462-A and OP462-B by
using two 10 k resistors followed by OP462-D as a unity-gain
buffer.
It is important to use 1% or better tolerance components for the
2 k resistors, as the common-mode rejection is dependent on
their ratios being exact. A potentiometer should also be connected
in series with the OP462-C noninverting input resistor to ground
to optimize common-mode rejection.
The circuit in Figure 47 was implemented to test its settling
time. The instrumentation amp was powered with 5 V, so the
input step voltage went from 5 V to +4 V to keep the OP462
within its input range. Therefore, the 0.05% settling range is
when the output is within 4.5 mV. Figure 48 shows the positive
slope settling time to be 1.8 s, and Figure 49 shows a settling
time of 3.9 s for the negative slope.
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