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AD9432BSQ-80 Datasheet(PDF) 11 Page - Analog Devices |
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AD9432BSQ-80 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 20 page  REV. E AD9432 –11– Table I. Output Coding (VREF = 2.5 V) (Two’s Complement) Code AIN– AIN (V) Digital Output +2047 1.000 0111 1111 1111 •• • •• • 0 0 0000 0000 0000 –1 –0.00049 1111 1111 1111 •• • •• • –2048 –1.000 1000 0000 0000 Voltage Reference A stable and accurate 2.5 V voltage reference is built into the AD9432 (VREFOUT). In normal operation the internal refer- ence is used by strapping Pin 45 to Pin 46 and placing a 0.1 µF decoupling capacitor at VREFIN. The input range can be adjusted by varying the reference voltage applied to the AD9432. No appreciable degradation in perfor- mance occurs when the reference is adjusted ±5%. The full-scale range of the ADC tracks reference voltage changes linearly. Timing The AD9432 provides latched data outputs, with 10 pipeline delays. Data outputs are included or available one propagation delay (tPD) after the rising edge of the encode command (see Figure 1). The length of the output data lines and loads placed on them should be minimized to reduce transients within the AD9432; these transients can detract from the converter’s dynamic performance. The minimum guaranteed conversion rate of the AD9432 is 1 MSPS. At internal clock rates below 1 MSPS, dynamic performance may degrade. Therefore, input clock rates below 1 MHz should be avoided. During initial power-up, or whenever the clock to the AD9432 is interrupted, the output data will not be accurate data for 200 ns or 10 clock cycles, whichever is longer. Using the AD8138 to Drive the AD9432 A new differential output op amp from Analog Devices, Inc., the AD8138, can be used to drive the AD9432 in dc-coupled applications. The AD8138 was specifically designed for ADC driver applications. Superior SNR performance is maintained up to analog frequencies of 30 MHz. The AD8138 op amp provides single-ended-to-differential conversion, providing for a low-cost option to transformer coupling for ac applications as well. The circuit in Figure 10 was breadboarded and the measured performance is shown in Figures 11 and 12. The figures shown are for ±5 V supplies at the AD8138—performance dropped by about 1 dB–2 dB with a single 5 V supply at the AD8138. Figure 11 shows SNR and SINAD for a –1 dBFS analog input frequency varied from 2 MHz to 40 MHz with an encode rate of 105 MSPS. The measurements are for nominal conditions at room temperature. Figure 12 shows the second and third har- monic distortion performance under the same conditions. The dc common-mode voltage for the AD8138 outputs can be adjusted via input VOCM to provide the 3 V common-mode voltage the AD9432 inputs require. AD8138 500 500 50 50 22pF AIN AIN AD9432 10pF 10pF 500 25 50 500 VOCM 3k 2k 5V VIN 0.1 F Figure 10. AD8138/AD9432 Schematic AIN – MHz 0 20 60 64 40 63 62 61 60 SNR SINAD 65 66 Figure 11. Measured SNR and SINAD (Encode = 105 MSPS) AIN – MHz –80 –90 –100 –70 H2 H3 020 40 60 Figure 12. Measured Second and Third Order Harmonic Distortion (Encode = 105 MSPS) |
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