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ADS900E Arkusz danych(PDF) 10 Page - Texas Instruments |
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ADS900E Arkusz danych(HTML) 10 Page - Texas Instruments |
10 / 16 page ADS900 10 SBAS058A OPA680 V IN R F V CM = 1.5V I = 250µA 0.1µF IN CM +1.5V REFB +1.25V R S R IN +3V +5V R 1 R 2 V OS 0.1µF 22pF 0.1µF ADS900 IN R 1 1k Ω OPA68x V IN R F 402 Ω V CM = 1.5V C 1 0.1µF 0.1µF IN IN CM +5V R S 50 Ω +3V R G 402 Ω C G 0.1µF 22pF ADS900 As a passive component, a transformer can be used to step- up the signal amplitude without adding noise or distortion. At the same time it electrically isolates the front-end from the converter. In order to achieve optimum performance and to bias the converter inputs up to the correct common-mode voltage the mid-reference pin “CM” can be tied directly to the center tap of the transformer. Figure 6 shows an example for a single-ended DC-coupled interface circuit using one high-speed op amp to level-shift the ground-referenced input signal to condition it for the input requirements of the ADS900. With a +3V supply the input signal swings 1Vp-p centered around a typical com- mon-mode voltage of +1.5V. This voltage can be derived from the internal bottom reference (REFB = +1.25V) and then fed back through a resistor divider (R1, R2) to level shift the driving op amp (OPA680). A capacitor across R2 will shunt most of the wideband noise to ground. Depending on the configured gain the values of resistors R1 and R2 must be adjusted since the offsetting voltage (VOS) is amplified by the non-inverting gain, 1+(RF/RIN). This example assumes the sum of R1 and R2 to be 5kΩ, drawing only 250µA from the bottom reference. Considerations for the selection of a FIGURE 6. Single-Ended DC-Coupled Input Circuit. FIGURE 4. Driver Circuit Using Single Supply. FIGURE 5. Single-Ended to Differential Drive Circuit Using a Transformer. OPA65x V IN R 1 RF Transformer: Minicircuits TT1-6 0.1µF IN CM R S T 1 R 2 22pF R T 22pF ADS900 +3V IN |
Podobny numer części - ADS900E |
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Podobny opis - ADS900E |
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