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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： | 7/20页 |
| 文件大小： | 949K |
| 代理商： | OP262HRUZ-REEL |
OP162/OP262/OP462
Rev. F | Page 15 of 20
00288-042
10
0%
100
90
50mV
1
s
VS = 5V
AV = 1
CL = 300pF
RL = 10k
WITH SNUBBER:
RX = 140
CX = 10nF
Figure 45 shows the worst case crosstalk between two amplifiers
in the OP462. A 1 V rms signal is applied to one amplifier while
measuring the output of an adjacent amplifier. Both amplifiers
are configured for unity gain and supplied with ±2.5 V.
FREQUENCY (Hz)
THD+N
(%)
0.010
0.001
0.0001
20
100
1k
10k
20k
00288-
044
VS = ±2.5V
AV = 1
VIN = 1.0V rms
RL = 10k
BANDWIDTH:
<10Hz TO 22kHz
Figure 42. A Photo of a Nice Square Wave at the Output
The network operates in parallel with the load capacitor, CL,
and provides compensation for the added phase lag. The actual
values of the network resistor and capacitor are empirically
determined to minimize overshoot and maximize unity-gain
bandwidth. Table 6 shows a few sample snubber networks for
large load capacitors.
Figure 44. THD + N vs. Frequency
FREQUENCY (Hz)
XTALK
(dBV)
–40
–90
–80
–70
–60
–50
–140
–130
–120
–110
–100
20
100
1k
10k
20k
00288-
045
AV = 1
VIN = 1.0V rms
(0dBV)
RL = 10k
VS = ±2.5V
Table 6. Snubber Networks for Large Capacitive Loads
CLOAD
RX
CX
< 300 pF
140
10 nF
500 pF
100
10 nF
1 nF
80
10 nF
10
47 nF
Higher load capacitance will reduce the unity-gain bandwidth
of the device. Figure 43 shows unity-gain bandwidth vs.
capacitive load. The snubber network does not provide any
increase in bandwidth, but it substantially reduces ringing and
overshoot, as shown between Figure 41 and Figure 42.
CLOAD
BANDWIDTH
(MHz)
10
7
8
9
5
6
4
3
2
1
0
10pF
100pF
1nF
10nF
00288-043
Figure 45. Crosstalk vs. Frequency
PCB LAYOUT CONSIDERATIONS
Because the OP162/OP262/OP462 can provide gains at high
frequency, careful attention to board layout and component
selection is recommended. As with any high speed application,
a good ground plane is essential to achieve the optimum
performance. This can significantly reduce the undesirable
effects of ground loops and I × R losses by providing a low
impedance reference point. Best results are obtained with a
multilayer board design with one layer assigned to ground
plane.
Use chip capacitors for supply bypassing, with one end of the
capacitor connected to the ground plane and the other end
connected within 1/8 inch of each power pin. An additional
large tantalum electrolytic capacitor (4.7 F to 10 F) should be
connected in parallel. This capacitor provides current for fast,
large-signal changes at the device’s output; therefore, it does not
need to be placed as close to the supply pins.
Figure 43. Unity-Gain Bandwidth vs. CLOAD
TOTAL HARMONIC DISTORTION AND CROSSTALK
The OPx62 device family offers low total harmonic distortion
making it an excellent choice for audio applications. Figure 44
shows a graph of THD plus noise figures at 0.001% for the
OP462.
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