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ADS5542 Datasheet(PDF) 20 Page - Burr-Brown (TI) |
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ADS5542 Datasheet(HTML) 20 Page - Burr-Brown (TI) |
20 / 29 page www.ti.com R IN R IN C IN 0.1 µF R T 100 Ω 0.1 µF 1000pF 1:1 R S 100 Ω OPA695 R 1 400 Ω A V = 8V/V (18dB) R 2 57.5 Ω V IN INP INM CM −5V +5V 10 Ω ADS5510 ADS5510 SLAS499 – JANUARY 2007 Table 4. Recommended Amplifiers to Drive the Input of the ADS5510 INPUT SIGNAL FREQUENCY RECOMMENDED AMPLIFIER TYPE OF AMPLIFIER USE WITH TRANSFORMER? DC to 20 MHz THS4503 Differential In/Out Amp No DC to 50 MHz OPA847 Operational Amp Yes DC to 100 MHz THS4509 Differential In/Out Amp No OPA695 Operational Amp Yes 10 MHz to 120 MHz THS3201 Operational Amp Yes THS3202 Operational Amp Yes Over 100 MHz THS9001 RF Gain Block Yes When using single-ended operational amplifiers (such as the THS3201, THS3202, OPA695, or OPA847) to provide gain, a three-amplifier circuit is recommended with one amplifier driving the primary of an RF transformer and one amplifier in each of the legs of the secondary driving the two differential inputs of the ADS5510. These three amplifier circuits minimize even-order harmonics. For high frequency inputs, an RF gain block amplifier can be used to drive a transformer primary; in this case, the transformer secondary connections can drive the input of the ADS5510 directly, as shown in Figure 25, or with the addition of the filter circuit shown in Figure 26. Figure 26 illustrates how RIN and CIN can be placed to isolate the signal source from the switching inputs of the ADC and to implement a low-pass RC filter to limit the input noise in the ADC. It is recommended that these components be included in the ADS5510 circuit layout when any of the amplifier circuits discussed previously are used. The components allow fine-tuning of the circuit performance. Any mismatch between the differential lines of the ADS5510 input produces a degradation in performance at high input frequencies, mainly characterized by an increase in the even-order harmonics. In this case, special care should be taken to keep as much electrical symmetry as possible between both inputs. Another possible configuration for lower-frequency signals is the use of differential input/output amplifiers that can simplify the driver circuit for applications requiring dc-coupling of the input. Flexible in their configurations (see Figure 27), such amplifiers can be used for single-ended-to-differential conversion signal amplification. Figure 26. Converting a Single-Ended Input Signal to a Differential Signal Using an RF Transformer 20 Submit Documentation Feedback |
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