Low-noise successive approximation ADC provides 18-bit resolution at a 1Msps throughput rate with no pipeline delay or cycle latency. Fully differential true bipolar inputs support ±6.25V, ±10.24V, and ±12.5V ranges, with typical 100dB SNR and −115dB THD at a 2kHz input in the ±10.24V range. A single 5V supply powers the converter, while the SPI-compatible serial interface supports 1.8V to 5V logic and daisy-chain operation. The device integrates a 2.048V low-drift reference and single-shot capable reference buffer, dissipates typically 50mW at full rate, and is supplied in a 16-lead plastic MSOP package.
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| Resolution | 18Bits |
| Maximum Sampling Frequency | 1Msps |
| Input Type | Fully differential, true bipolar |
| Input Voltage Ranges | ±6.25, ±10.24, ±12.5V |
| Integral Linearity Error | ±4 maxLSB |
| No Missing Codes | 18Bits |
| Signal-to-Noise Ratio | 100 typ at ±10.24V range, fIN = 2kHzdB |
| Total Harmonic Distortion | -115 typ at ±10.24V range, fIN = 2kHzdB |
| Spurious Free Dynamic Range | 117 typ at ±10.24V range, fIN = 2kHzdB |
| Supply Voltage | 4.75 to 5.25V |
| Digital I/O Supply Voltage | 1.71 to 5.25V |
| Internal Reference Voltage | 2.048 typV |
| Internal Reference Temperature Coefficient | 20 maxppm/°C |
| Power Dissipation | 50 typ at 1MspsmW |
| Sleep Mode Power | 0.3 typmW |
| Interface | SPI-compatible serial I/O with daisy-chain mode |
| Conversion Time | 460 typ, 527 maxns |
| Package | 16-lead plastic MSOP |
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These are design resources that include the Analog Devices LTC2338-18
Design note for a single-ended to differential driver circuit for the LTC2338-18 ADC using the LT1469 dual op amp and two resistors to handle ±10.24V bipolar inputs.
