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MAX1295 Datasheet(PDF) 15 Page - Maxim Integrated Products |
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MAX1295 Datasheet(HTML) 15 Page - Maxim Integrated Products |
15 / 20 page 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface ______________________________________________________________________________________ 15 Shutdown Mode Shutdown mode turns off all chip functions that draw qui- escent current, reducing the typical supply current to 2µA immediately after the current conversion is complet- ed. A rising edge on WR causes the MAX1295/MAX1297 to exit shutdown mode and return to normal operation. To achieve full 12-bit accuracy with a 4.7µF reference bypass capacitor, 50µs is required after power-up. Waiting this 50µs in standby mode instead of in full- power mode can reduce power consumption by a factor of 3 or more. When using an external reference, only 50µs is required after power-up. Enter standby mode by performing a dummy conversion with the control byte specifying standby mode. Note: Bypass capacitors larger than 4.7µF between REF and GND will result in longer power-up delays. Transfer Function Table 5 shows the full-scale voltage ranges for unipolar and bipolar modes. Figure 8 depicts the nominal unipo- lar input/output (I/O) transfer function, and Figure 9 shows the bipolar I/O transfer function. Code transitions occur halfway between successive-integer LSB values. Output coding is binary, with 1LSB = (VREF/4096). Maximum Sampling Rate/ Achieving 300ksps When running at the maximum clock frequency of 4.8MHz, the specified throughput of 265ksps is achieved by completing a conversion every 18 clock cycles: 1 write cycle, 3 acquisition cycles, 13 conversion cycles, and 1 read cycle. This assumes that the results of the last conversion are read before the next control byte is written. It is possible to achieve higher throughputs, up to 300ksps, by first writing a control byte to begin the Table 5. Full-Scale and Zero-Scale for Unipolar and Bipolar Operation 111 . . . 111 111 . . . 110 100 . . . 010 100 . . . 001 100 . . . 000 011 . . . 111 011 . . . 110 011 . . . 101 000 . . . 001 000 . . . 000 1 0 INPUT VOLTAGE (LSB) OUTPUT CODE ZS = COM FS = REF + COM 1LSB = REF 4096 FULL-SCALE TRANSITION (COM) FS - 3/2LSB FS 2 2048 UNIPOLAR MODE BIPOLAR MODE VREF + COM VREF/2 + COM Positive Full Scale Full Scale COM COM Zero Scale Zero Scale — -VREF/2 + COM Negative Full Scale — Figure 8. Unipolar Transfer Function 011 . . . 111 011 . . . 110 000 . . . 010 000 . . . 001 000 . . . 000 111 . . . 111 111 . . . 110 111 . . . 101 100 . . . 001 100 . . . 000 - FS COM* INPUT VOLTAGE (LSB) OUTPUT CODE ZS = COM +FS - 1LSB *COM VREF/2 + COM FS = REF 2 -FS = + COM -REF 2 1LSB = ≤ REF 4096 Figure 9. Bipolar Transfer Function |
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