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THS4541IRUNR.B Datasheet(PDF) 47 Page - Texas Instruments |
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THS4541IRUNR.B Datasheet(HTML) 47 Page - Texas Instruments |
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47 / 66 page  Rf1 402 Rg1 4.02 k Rg2 4.02 k THS4541 Wideband, Fully-Differential Amplifier Rf2 402 Gain of 0.1 V/V from Rg1, Single-Ended to Differential, DC-Coupled, Single Supply R1 500 + ± + ± + ± + ± Vcc Vcm Vcc 5 V Vcm 2.5 V VM1 VG1 C3 1 pF C1 1.7 pF C2 1.7 pF + ± Vcc + ± Vocm Vcc FDA PD Figure 9-2. Compensated Attenuator Circuit Using the THS4541 The 1 pF across the inputs is really a total 1.85 pF, including the internal differential capacitance, and a Cs = 3.7 pF for a single-ended design from Equation 17. These two designs (with and without the capacitors) were both bench tested and simulated using the THS4541 TINA model giving the results of Figure 9-3. This method does a good job of flattening the response for what starts out as a low phase-margin attenuator application. The simulation model does a very good job of predicting the peaking and showing the same improvement with the external capacitors; both giving a flat, approximately 250-MHz, closed-loop bandwidth for this gain of a 0.1-V/V design. In this example, the output noise begins to peak up (as a result of the noise-gain shaping of the capacitors) above 70 MHz. Use postfiltering to minimize any increase in the integrated noise using this technique. Using this solution to deliver an 8-VPP differential output to a successive approximation register (SAR) ADC (using the 2.5-V Vocm shown), the circuit accepts up to ±40-V inputs, where the 4-kΩ input Rg1 draws ±10 mA from the source. 9.2.1.3 Application Curve Frequency (Hz) -32 -29 -26 -23 -20 -17 -14 -11 1M 10M 100M 1G D064 Bench without caps Bench with caps Sim without caps Sim with caps Figure 9-3. Attenuator Response Shapes with and without External Compensation www.ti.com THS4541 SLOS375B – AUGUST 2014 – REVISED FEBRUARY 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 47 Product Folder Links: THS4541 |
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