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THS4141 Datasheet(PDF) 11 Page - Texas Instruments |
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THS4141 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page www.ti.com APPLICATION INFORMATION RESISTOR MATCHING 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 THS4140 THS4141 SLOS320F – MAY 2000 – REVISED JANUARY 2006 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 will 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 will be 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 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 21 shows the simplified diagram of the THS414x. Figure 21. THS414x Simplified Diagram 11 Submit Documentation Feedback |
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