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THS4131 bảng dữ liệu(PDF) 13 Page - National Semiconductor (TI)

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tên linh kiện THS4131
Giải thích chi tiết về linh kiện  HIGH-SPEED, LOW-NOISE, FULLY-DIFFERENTIAL I/O AMPLIFIERS
PDF  37 Pages
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THS4131 bảng dữ liệu(HTML) 13 Page - National Semiconductor (TI)

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V
CC) )
V
CC–
2
_
+
x1
Output Buffer
Vcm Error
Amplifier
C
R
C
R
x1
Output Buffer
VOUT+
VOUT−
VCC+
VCC−
VIN−
VIN+
30 k
Ω
30 k
Ω
VCC+
VCC−
VOCM
THS4130
THS4131
www.ti.com
SLOS318H
– MAY 2000 – REVISED MAY 2011
APPLICATION INFORMATION
RESISTOR MATCHING
Resistor matching is important in fully-differential amplifiers. The balance of the output on the reference voltage
depends on matched ratios of the resistor. CMRR, PSRR, and cancellation of the second-harmonic distortion
diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to
keep the performance optimized.
VOCM sets the dc level of the output signals. If no voltage is applied to the VOCMpin, it is set to the midrail voltage
internally defined as:
(1)
In the differential mode, the VOCM on the two outputs cancel each other. Therefore, the output in the differential
mode is the same as the input in the gain of 1. VOCM has a high bandwidth capability up to the typical operation
range of the amplifier. For the prevention of noise going through the device, use a 0.1
µF capacitor on the VOCM
pin as a bypass capacitor. Figure 29 shows the simplified diagram of the THS413x.
Figure 29. THS413x Simplified Diagram
Copyright
© 2000–2011, Texas Instruments Incorporated
13



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