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AD871 Datasheet(PDF) 10 Page - Analog Devices |
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AD871 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD871 REV. A –10– Figure 12 shows the common-mode rejection performance vs. frequency for a 1 V p-p common-mode input. This excellent common-mode rejection over a wide bandwidth affords the user the opportunity to eliminate many potential sources of input noise as common mode by using the differential input structure of the AD871. –40 –70 –100 –90 –80 –60 –50 INPUT FREQUENCY – Hz 10k 100k 10M 1M Figure 12. Common-Mode Rejection vs. Input Frequency, 1 V p-p Input Figures 13 and 14 illustrate typical input connections for single ended inputs. 1 2 VINA VINB AD871 1V Figure 13. AD871 Single-Ended Input Connection 1 2 VINA VINB AD871 RT 1V Figure 14. AD871 Single-Ended Input Connection Using a Shielded Cable The cable shield is used as the ground connection for the VINB input, providing the best possible rejection of the cable noise from the input signal. Note also that the high input impedance of the AD871 allows the user to select the termination imped- ance, be it 50 ohms, 75 ohms, or some other value. Further- more, unlike many flash converters, most AD871 applications will not require an external buffer amplifier. If such an amplifier is required, we suggest either the AD811 or AD9617. Figure 15 illustrates how external amplifiers may be used to convert a single-ended input into a differential signal. The resis- tor values of 536 Ω and 562 Ω were selected to provide opti- mum phase matching between U1 and U2. VINA VINB AD871 U2 U1 VIN ( 0.5V) 562 536 562 536 Figure 15. Single-Ended to Differential Connections; U1, U2 = AD811 or AD9617 The use of the differential input signal can help to minimize even-order distortion from the input THA where performance beyond –70 dB is desired. Figure 16 shows the AD871 large signal (–0.5 dB) and small signal (–20 dB) frequency response. 10 –30 104 108 0 –20 105 –10 106 107 INPUT FREQUENCY – Hz Figure 16. Full Power (–0.5 dB) and Small Signal Response (–20 dB) vs. Input Frequency The AD871’s wide input bandwidth facilitates rapid acquisition of transient input signals: the input THA can typically settle to 12-bit accuracy from a full-scale input step in less than 80 ns. Fig- ure 17 illustrates the typical acquisition of a full-scale input step. 4400 0 100 1200 400 800 0 2400 1600 2000 2800 3200 3600 4000 80 60 40 20 TIME – ns Figure 17. Typical AD871 Settling Time |
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