TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439I–JUNE 2007–REVISED MARCH 2011
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R
1 kΩ
on
Switch
R
s
ADCIN0
C
10 pF
C
h
1.64 pF
p
Source
Signal
ac
28x DSP
Typical Values of the Input Circuit Components:
Switch Resistance (R ):
1 kΩ
1.64 pF
on
Sampling Capacitor (C ):
h
Parasitic Capacitance (C ): 10 pF
p
Source Resistance (R ):
50 Ω
s
Figure 6-32. ADC Analog Input Impedance Model
6.15.2 Definitions
Reference Voltage
The on-chip ADC has a built-in reference, which provides the reference voltages for the ADC.
Analog Inputs
The on-chip ADC consists of 16 analog inputs, which are sampled either one at a time or two channels at
a time. These inputs are software-selectable.
Converter
The on-chip ADC uses a 12-bit four-stage pipeline architecture, which achieves a high sample rate with
low power consumption.
Conversion Modes
The conversion can be performed in two different conversion modes:
•
•
Sequential sampling mode (SMODE = 0)
Simultaneous sampling mode (SMODE = 1)
170
Electrical Specifications
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