參數(shù)資料
型號(hào): MC56F8347MPY60
廠商: MOTOROLA INC
元件分類: 數(shù)字信號(hào)處理
英文描述: 16-BIT, 120 MHz, OTHER DSP, PQFP160
封裝: LQFP-160
文件頁數(shù): 56/160頁
文件大小: 2217K
代理商: MC56F8347MPY60
Equivalent Circuit for ADC Inputs
568347 Technical Data
149
Preliminary
39%) the collective variation (spread) of the absolute error of the population. It also significantly
reduced (by as much as 80%) the mean (average) of the absolute error and thereby brought it
significantly closer to the ideal value of zero. Although not guaranteed, it is believed that
calibration will produce results similar to those shown above for any population of parts, including
those which represent processing and temperature extremes.
10.18 Equivalent Circuit for ADC Inputs
Figure 10-23 illustrates the ADC input circuit during sample and hold. S1 and S2 are always
open/closed at the same time that S3 is closed/open. When S1/S2 are closed & S3 is open, one input
of the sample and hold circuit moves to VREFH - VREFH / 2, while the other charges to the analog
input voltage. When the switches are flipped, the charge on C1 and C2 are averaged via S3, with
the result that a single-ended analog input is switched to a differential voltage centered about
VREFH - VREFH / 2. The switches switch on every cycle of the ADC clock (open one-half ADC
clock, closed one-half ADC clock). Note that there are additional capacitances associated with the
analog input pad, routing, etc., but these do not filter into the S/H output voltage, as S1 provides
isolation during the charge-sharing phase.
One aspect of this circuit is that there is an on-going input current, which is a function of the analog
input voltage, VREF and the ADC clock frequency.
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 10-23 Equivalent Circuit for A/D Loading
10.19 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]
1
2
3
Analog Input
4
S1
S2
S3
C1
C2
S/H
C1 = C2 = 1pF
(VREFH - VREFLO) / 2
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