TC1796
Peripheral Units (Vol. 2 of 2)
Analog-to-Digital Converter (ADC)
User’s Manual 25-1 V2.0, 2007-07
ADC, V2.0
25 Analog-to-Digital Converter (ADC)
The TC1796 contains two medium-speed Analog-to-Digital Converters (ADC0 and
ADC1) with identical functionality and a third fast Analog-to-Digital Converter (FADC).
ADC0 and ADC1 provide 2-3 µs conversion time @ 10-bit resolution and are intended
primarily for single-ended signals. They offer a very flexible and comprehensive control
for monitoring a large number of relatively slow signals, including synchronous
conversion of both ADCs.
The FADC offers very fast conversion rates (280 ns @ 10-bit resolution) thus allowing
sampling of high-frequency signals. For slow and mid-range frequency signal heavy
oversampling can be performed to avoid the use of expensive filters.
The FADC is described in Chapter 26. This chapter describes in detail the two Analog-
to-Digital converters ADC0 and ADC1. It contains the following sections:
• Functional description of the ADC Kernel for ADC0 and ADC1 (see Page 25-1)
• Register descriptions for all ADC Kernel specific registers (see Page 25-57)
• TC1796 implementation-specific details and registers of the ADC0/ADC1 modules,
including port connections and control, service request control, address decoding,
and clock control (see Page 25-100).
Note: The ADC Kernel register names described in Section 25.2 are referenced in the
TC1796 User’s Manual with the module name prefix “ADC0_” for the ADC0
interface and “ADC1_” for the ADC1 interface.
25.1 ADC Kernel Description
The two on-chip ADC modules of the TC1796 are analog-to-digital converters with 8-bit,
10-bit, or 12-bit resolution including sample & hold functionality. The A/D converters
operate by the method of successive approximation. A multiplexer selects up to
32 analog inputs that can be connected to the 16 conversion channels in each ADC
module. An automatic self-calibration adjusts the ADC modules to changing
temperatures or process variations.
Features
• 8-bit, 10-bit, 12-bit A/D conversion
• Conversion time below 2.5 µs @ 10-bit resolution
• Extended channel status information on request source
• Successive approximation conversion method
• Total Unadjusted Error (TUE) of ±2 LSB @ 10-bit resolution
• Integrated sample & hold functionality
• Direct control of up to 16(32) analog input channels per ADC
• Dedicated control and status registers for each analog channel
• Powerful conversion request sources
• Selectable reference voltages for each channel
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