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AD781 Datasheet(PDF) 8 Page - Analog Devices |
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AD781 Datasheet(HTML) 8 Page - Analog Devices |
8 / 8 page AD781 REV. A –8– AD781 TO AD674 INTERFACE Figure 9 shows a typical data acquisition circuit using the AD781, a high linearity, low aperture jitter SHA and the AD674 a 12-bit high speed ADC. The time between the AD674 status line going high and the actual start of conversion allows the AD781 to settle to 0.01%. As a result, the AD674 status line can be used to control the AD781; only an inverter is needed to interface the two devices. CS A0 10 VIN DGND 20 VIN REF IN REF OUT BIP OFFSET R/C AGND NC GAIN CONVERT 0.1µF +12V VCC IN GND 0.1µF –12V VIN OUT AD781 100 Ω 100 Ω OFFSET 28 15 3 4 13 14 10 8 12 5 9 5 8 2 3 4 NC 6 NC 1 7 AD674 –12V 4.7µF 0.1µF 11 +12V 4.7µF 0.1µF 7 D0–11 12-BIT THREE-STATE DATA 16 27 STS STATUS S/H 7404 OR EQUIV. CE +5V 6 VL 1 2 12/8 0.1µF VEE Figure 9. AD781 to AD674 Interface 20 –140 –100 –120 0 –60 –80 –40 –20 0 3 7 10 13 16 20 23 26 30 33 FREQUENCY BINS – kHz Figure 10. FFT Plot of AD781 to AD674 Interface, FIN = 1 kHz OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Cerdip (Q) Package Mini-DIP (N) Package |
Similar Part No. - AD781_15 |
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Similar Description - AD781_15 |
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