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SD16 Introduction
21-2 SD16
21.1 SD16 Introduction
The SD16 module consists of up to three independent sigma-delta
analog-to-digital converters and an internal voltage reference. Each channel
has up to 8 fully differential multiplexed inputs including a built-in temperature
sensor. The converters are based on second-order oversampling sigma-delta
modulators and digital decimation filters. The decimation filters are comb type
filters with selectable oversampling ratios of up to 256. Additional filtering can
be done in software.
Features of the SD16 include:
- 16-bit sigma-delta architecture
- Up to 3 independent, simultaneously-sampling ADC channels
- Up to 8 multiplexed differential analog inputs per channel
- Software selectable on-chip reference voltage generation (1.2V)
- Software selectable internal or external reference
- Built-in temperature sensor accessible by all channels
- Up to 1.048576 MHz modulator input frequency
- Selectable low-power conversion mode
The block diagram of the SD16 module is shown in Figure 21−1.