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THS4121IDG4 Datasheet(PDF) 10 Page - Texas Instruments

Part # THS4121IDG4
Description  HIGH-SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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THS4121IDG4 Datasheet(HTML) 10 Page - Texas Instruments

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APPLICATION INFORMATION
RESISTOR MATCHING
V
DD
) VSS
2
(1)
_
+
x1
Output Buffer
Vcm Error
Amplifier
C
R
C
R
x1
Output Buffer
VOUT+
VOUT-
VDD
VSS
VIN-
VIN+
30 k
30 k
VDD
VSS
VOCM
THS4120
THS4121
SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004
Resistor matching is important in fully differential amplifiers. The balance of the output on the reference voltage
depends on matched ratios of the resistors. 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 VOCM pin, it is set to the midrail voltage
internally defined as:
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 with 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. The following graph shows the simplified diagram of the THS412x.
Figure 18. THS412x Simplified Diagram
10
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