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ADS5421R Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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ADS5421R Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 21 page ADS5421 11 SBAS237D www.ti.com FIGURE 4. Driving the ADS5421 with a Low-Distortion IF Amplifier and a Transformer Suited for IF Sampling Applications. ADS5421 R IN R S R IN C IN 0.1 µF 2.2 µF R T 1:n IF Amplifier V IN (IF) IN IN CM Optional Bandpass Filter + +5V NOTE: Supply bypassing not shown. XFR TRANSFORMER-COUPLED, SINGLE-ENDED-TO- DIFFERENTIAL CONFIGURATION For applications in which the input frequency is limited to approximately 10MHz (e.g., baseband), a high-speed opera- tional amplifier may be used. The OPA847 is configured for the noninverting mode; this amplifies the single-ended input signal and drives the primary of a RF transformer (see Figure 5). To maintain the very low distortion performance of the OPA847, it may be advantageous to set the full-scale input range of the ADS5421 to 3Vp-p or 2Vp-p (refer to the Reference section for details on selecting the converter’s full-scale range). The circuit also shows the use of an additional RC low-pass filter placed in series with each converter input. This optional filter can be used to set a defined corner frequency and attenuate some of the wideband noise. The actual compo- nent values would need to be tuned for individual application requirements. As a guideline, resistor values are typically in the range of 10 Ω to 50Ω, and capacitors in the range of 10pF to 100pF. In any case, the RIN and CIN values should have a low tolerance. This will ensure that the ADS5421 sees closely matched source impedances. FIGURE 5. Converting a Single-Ended Input Signal into a Differential Signal Using a RF Transformer. R IN R IN C IN 2.2 µF 0.1 µF R T 0.1 µF 1:n R S R G OPA847 R 1 R 2 V IN + ADS5421 IN IN CM +5V –5V +5V V CM ≈ +2.5V |
Similar Part No. - ADS5421R |
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Similar Description - ADS5421R |
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