TC1796
System Units (Vol. 1 of 2)
Introduction
User’s Manual 1-32 V2.0, 2007-07
Intro, V2.0
1.3.3.2 Fast Analog-to-Digital Converter Unit (FADC)
The on-chip FADC module of the TC1796 is primarily a four-channel A/D converter with
10-bit resolution that operates by the method of successive approximation.
Features
• Extreme fast conversion, 21 cycles of
f
FADC
(280 ns @ f
FADC
=75 MHz)
• 10-bit A/D conversion
– Higher resolution by averaging of consecutive conversions is supported
• Successive approximation conversion method
• Four differential input channels
• Offset and gain calibration support for each channel
• Differential input amplifier with programmable gain of 1, 2, 4 and 8 for each channel
• Free-running (Channel Timers) or triggered conversion modes
• Trigger and gating control for external signals
• Built-in Channel Timers for internal triggering
• Channel timer request periods independently selectable for each channel
• Selectable, programmable antialiasing and data reduction filter block
Figure 1-10 Block Diagram of the FADC Module
Address
Decoder
SR[3:0]
To DMA
MCB05582
V
FAGND
V
DDAF
V
SSAF
V
DDMF
V
FAREF
V
SSMF
Interrupt
Control
TS[7:0]
GS[7:0]
Clock
Control
f
FADC
f
CLC
A/D
Converter
Data
Reduction
Unit
Channel
Trigger
Control
Channel
Timers
A/D
Control
FAIN0P
FAIN0N
FAIN1P
FAIN1N
FAIN2P
FAIN2N
FAIN3P
FAIN3N
Input Stage
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