SM320F2808-EP Datasheet, PDF (109/118 Pages) Texas Instruments – Digital Signal Processors

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R_s
ADCIN0
Source
ac
Signal
SM320F2808-EP, SM320F2806-EP
SM320F2801-EP
Digital Signal Processors
SGLS316A – MARCH 2006 – REVISED FEBRUARY 2007
R_on
1 kΩ
Switch
C_p
10 pF
C_h
1.64 pF
28x DSP
Typical Values of the Input Circuit Components:
Switch Resistance (R_on):
Sampling Capacitor (C_h):
Parasitic Capacitance (C_p):
Source Resistance (R_s):
1 kΩ
1.64 pF
10 pF
50 Ω
Figure 6-23. ADC Analog Input Impedance Model
6.9.7.2 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)
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Electrical Specifications 109