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AD976ABRSZ Datasheet(PDF) 9 Page - Analog Devices |
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AD976ABRSZ Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page AD976/AD976A –9– REV. C R/ C CS BYTE PINS 6–13 PINS 15–22 HI-Z HIGH BYTE LOW BYTE HI-Z HI-Z HIGH BYTE LOW BYTE HI-Z t 14 t 12 t 12 t 14 t 9 Figure 4. Using CS and BYTE to Control Data Bus Read Timing Regardless of the method for controlling conversions, output data from conversion “n–1” will be valid during the BUSY Low time for roughly 3.7 µs (AD976A only), and output data from conversion “n” will be valid at the end of a conversion, 50 ns (t10) before BUSY returns High. It is recommended, however, that data is read only after BUSY goes high since this timing is much more clearly defined and provides optimal performance. Figure 4 demonstrates the functionality of the BYTE pin and shows how the data will be valid in Binary Twos Complement format only when R/C is asserted High and CS is Low. The BYTE pin enables the output data on the bus to be read as a full parallel output or as two 8-bit bytes on Pins 6–13 and Pins 15–22. ANALOG INPUTS Figure 5 shows the analog input section for the AD976 when operating with an internal reference. The analog input range is nominally a bipolar –10 V to +10 V. Since the AD976/AD976A can be operated with an internal or external reference, the full- scale analog input range can be best represented as ±4 V REF. The nominal input impedance is 23 k Ω/13 kΩ with a 22 pF input capacitance. The analog input section also has a ±25 V overvoltage protection. Since the AD976/AD976A has two analog grounds it is important to ensure that the analog input is referenced to the AGND1 pin, the low current ground. This will minimize any problems associated with a resistive ground drop. It is also important to ensure that the analog input of the AD976/AD976A is driven by a low impedance source. With its primarily resistive analog input circuitry, the ADC can be driven by a wide selection of general purpose amplifiers. To best match the low distortion requirements of the AD976/ AD976A, care should be taken in the selection of the drive circuitry op amp. Figure 6 shows the analog input section for the AD976A when operating with an internal reference only. Figure 9 shows the analog input section for both the AD976 and the AD976A when operating with an external reference. VIN AGND1 REF CAP AGND2 10V INPUT R2 33.2k C2 2.2 F AD976 R1 200 C1 2.2 F Figure 5. ±10 V Input Connection for the AD976 (Internal Reference) C1 2.2 F R2 66.4k VANA VIN AGND1 REF CAP AGND2 10V INPUT C2 2.2 F AD976A R1 200 +5V Figure 6. ±10 V Input Connection for the AD976A (Internal Reference) Only |
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