56F8345_07 Datasheet, PDF (156/172 Pages) Freescale Semiconductor, Inc – 16-bit Digital Signal Controllers

Analog Input
1
2
3
4
S1
C1
(V_REFH - V_REFLO) / 2
S2
S3 S/H
C2
C1 = C2 = 1pF
1. Parasitic capacitance due to package, pin-to-pin and pin-to-package base coupling; 1.8pf
2. Parasitic capacitance due to the chip bond pad, ESD protection devices and signal routing; 2.04pf
3. Equivalent resistance for the ESD isolation resistor and the channel select mux; 500 ohms
4. Sampling capacitor at the sample and hold circuit. Capacitor C1 is normally disconnected from the input and is only
connected to it at sampling time; 1pf
Figure 10-22 Equivalent Circuit for A/D Loading
10.17 Power Consumption
This section provides additional detail which can be used to optimize power consumption for a given
application.
Power consumption is given by the following equation:
Total power = _{A: internal [static component]}
+B: internal [state-dependent component]
+C: internal [dynamic component]
+D: external [dynamic component]
+E: external [static]
A, the internal [static component], is comprised of the DC bias currents for the oscillator, leakage current,
PLL, and voltage references. These sources operate independently of processor state or operating
frequency.
B, the internal [state-dependent component], reflects the supply current required by certain on-chip
resources only when those resources are in use. These include RAM, Flash memory and the ADCs.
C, the internal [dynamic component], is classic C*V²*F CMOS power dissipation corresponding to the
56800E core and standard cell logic.
D, the external [dynamic component], reflects power dissipated on-chip as a result of capacitive loading
on the external pins of the chip. This is also commonly described as C*V²*F, although simulations on two
of the IO cell types used on the device reveal that the power-versus-load curve does have a non-zero
Y-intercept.
56F8345 Technical Data, Rev. 17
156
Freescale Semiconductor
Preliminary