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OPA2652E250 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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OPA2652E250 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 23 page  www.ti.com Differential ADC Driver Bandpass Filter 0 -5 -10 -15 -20 -25 -30 -35 -40 10k 100k 1M 10M 100M Frequency(Hz) 1/2 OPA2652 1/2 OPA2652 24.9W 143W 140W 2.10kW 1.0nF 1.0nF V IN +5V -5V 2.2nF 1.30kW 24.9W 200W 107W 225W 20.0W 158W 150pF 12pF 2.7nF +5V -5V 180pF 100W 100pF 1%Resistors 5%Capacitors 18pF V OUT OPA2652 SBOS125A – JUNE 2000 – REVISED MAY 2006 The circuit on the front page shows an OPA2652 driving the ADS807 analog-to-digital converter (ADC) differentially, at a gain of +2V/V. The outputs are AC-coupled to the converter to adjust for the difference in supply voltages. The 133 Ω resistors at the noninverting inputs minimize DC offset errors. The differential topology minimizes even-order distortion products, such as second-harmonic distortion. Figure 31 shows a single OPA2652 implementing a sixth-order bandpass filter. This filter cascades two second-order Sallen-Key sections with transmission Figure 30. Nominal Filter Response zeros, and a double real pole section. It has 0.3dB of ripple, –3dB frequencies of 450kHz and 11MHz, and –23dB frequencies of 315kHz and 16MHz. The 20.0 Ω resistor isolates the first OPA2652 output from capacitive loading. This configuration improves stability with minimal impact on the filter response. Figure 30 shows the nominal response simulated by SPICE. Figure 31. Bandpass Filter 11 Submit Documentation Feedback |
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