An 18-bit charge-redistribution SAR analog-to-digital converter supports programmable bipolar and unipolar input ranges. The converter provides 250 kSPS throughput for AD7631 operation, 18-bit resolution with no missing codes, 102.5 dB typical dynamic range, and 101 dB typical SNR. It includes an internal 5 V reference with a typical 7 ppm/°C drift, a TEMP output, and serial or parallel digital interfaces compatible with 3.3 V or 5 V logic. Operation is specified from -40 °C to +85 °C in Pb-free 48-lead LQFP and LFCSP packages.
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| Converter Type | SAR ADC |
| Resolution | 18bit |
| Throughput Rate | 250kSPS |
| Input Ranges | +/-10, +/-5, 0 to 10, 0 to 5V |
| Integral Nonlinearity | +/-1.75 typicalLSB |
| Differential Nonlinearity | +2/-1LSB |
| No Missing Codes | 18bit |
| Dynamic Range | 102.5 typicaldB |
| Signal-to-Noise Ratio | 101 typicaldB |
| Total Harmonic Distortion | -122 typicaldB |
| Internal Reference Voltage | 5V |
| Reference Drift | 7 typicalppm/°C |
| Analog Supply Voltage | 5V |
| Digital Supply Voltage | 5V |
| Output Interface Supply Voltage | 2.7 to 5.5V |
| Interface | Parallel 18-bit/16-bit/8-bit; serial SPI/QSPI/MICROWIRE/DSP-compatible |
| Power Dissipation | 75 at 250 kSPSmW |
| Operating Temperature Range | -40 to +85°C |
| Pb-free | Yes |
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