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THS4121IDG4 Datasheet(PDF) 10 Page - Texas Instruments |
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THS4121IDG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page www.ti.com 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 Ω 30 k Ω 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 Submit Documentation Feedback |
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