Datasheet

ac
R
s
ADCIN0
C
p
10 pF
R
on
1 kΩ
1.64 pF
C
h
Switch
Typical Values of the Input Circuit Components:
Switch Resistance (R
on
): 1 kΩ
Sampling Capacitor (C
h
): 1.64 pF
Parasitic Capacitance (C
p
): 10 pF
Source Resistance (R
s
): 50 Ω
28x DSP
Source
Signal
TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
www.ti.com SPRS439M –JUNE 2007–REVISED AUGUST 2012
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)
Copyright © 2007–2012, Texas Instruments Incorporated Electrical Specifications 171
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TMS320F28232