Datasheet

ADC12 Introduction

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23.1 ADC12 Introduction

The ADC12 module supports fast 12-bit analog-to-digital conversions. The module implements a 12-bit

SAR core, sample select control, reference generator, and a 16-word conversion-and-control buffer. The

conversion-and-control buffer allows up to 16 independent ADC samples to be converted and stored

without any CPU intervention.

ADC12 features include:

• Greater than 200-ksps maximum conversion rate

• Monotonic 12-bit converter with no missing codes

• Sample-and-hold with programmable sampling periods controlled by software or timers

• Conversion initiation by software, Timer_A, or Timer_B

• Software selectable on-chip reference voltage generation (1.5 V or 2.5 V)

• Software selectable internal or external reference

• Eight individually configurable external input channels

• Conversion channels for internal temperature sensor, AV

, and external references

• Independent channel-selectable reference sources for both positive and negative references

• Selectable conversion clock source

• Single-channel, repeat-single-channel, sequence, and repeat-sequence conversion modes

• ADC core and reference voltage can be powered down separately

• Interrupt vector register for fast decoding of 18 ADC interrupts

• 16 conversion-result storage registers

The block diagram of ADC12 is shown in Figure 23-1.

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ADC12 SLAU144J–December 2004–Revised July 2013

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