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SD16_A Introduction

26.1 SD16_A Introduction

The SD16_A module consists of one sigma-delta analog-to-digital converter with a high-impedance input

buffer and an internal voltage reference. It has up to eight fully differential multiplexed analog input pairs

including a built-in temperature sensor and a divided supply voltage. The converter is based on a second-

order oversampling sigma-delta modulator and digital decimation filter. The decimation filter is a comb

type filter with selectable oversampling ratios of up to 1024. Additional filtering can be done in software.

The high impedance input buffer is not implemented in MSP430x20x3 devices.

Features of the SD16_A include:

• 16-bit sigma-delta architecture

• Up to eight multiplexed differential analog inputs per channel(The number of inputs is device

dependent, see the device-specific data sheet.)

• Software selectable on-chip reference voltage generation (1.2 V)

• Software selectable internal or external reference

• Built-in temperature sensor

• Up to 1.1-MHz modulator input frequency

• High impedance input buffer(not implemented on all devices, see the device-specific data sheet)

• Selectable low-power conversion mode

The block diagram of the SD16_A module is shown in Figure 26-1.

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SLAU144J–December 2004–Revised July 2013 SD16_A

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