參數資料
型號: MC56F8255VLD
廠商: Freescale Semiconductor
文件頁數: 66/88頁
文件大?。?/td> 0K
描述: DSC 64K FLASH 60MHZ 44-LQFP
標準包裝: 160
系列: 56F8xxx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 60MHz
連通性: CAN,I²C,LIN,SCI,SPI
外圍設備: LVD,POR,PWM,WDT
輸入/輸出數: 35
程序存儲器容量: 64KB(32K x 16)
程序存儲器類型: 閃存
RAM 容量: 4K x 16
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數據轉換器: A/D 8x12b,D/A 1x12b
振蕩器型: 內部
工作溫度: -40°C ~ 105°C
封裝/外殼: 44-LQFP
包裝: 管件
Specifications
MC56F825x/MC56F824x Digital Signal Controller, Rev. 3
Freescale Semiconductor
69
7.25.1
Equivalent Circuit for ADC Inputs
Figure 31 illustrates the ADC input circuit during sample and hold. S1 and S2 are always opened/closed at non-overlapping
phases and operate at the ADC clock frequency. Equivalent input impedance, when the input is selected, is as follows:
(2 x k / ADCClockRate x Cgain ) + 100 ohms + 125 ohms
Eqn. 1
where k =
1 for first sample
6 for subsequent samples
and Cgain is as described in note 4 below.
1. Parasitic capacitance due to package, pin-to-pin, and pin-to-package base coupling: 1.8 pF
Input impedance
XIN
—See Figure 31
—Ohms
AC Specifications9 (gain of 1x, 2x, 4x and fADC ≤ 10 MHz)4
Signal-to-noise ratio
SNR
59
dB
Total Harmonic Distortion
THD
64
dB
Spurious Free Dynamic Range
SFDR
65
dB
Signal-to-noise plus distortion
SINAD
59
dB
Effective Number Of Bits
ENOB
9.5
Bits
1 All measurements were made at VDD = 3.3V, VREFH = 3.3V, and VREFL = ground
2 Includes power-up of ADC and VREF
3 ADC clock cycles
4 Speed register setting must be 00 for ADC clock ≤ 5 MHz, 01 for 5 MHz < ADC clock ≤ 12 MHz, and 10 for ADC clock > 12 MHz
5 INL and DNL measured from VIN = VREFL to VIN = VREFH
6 LSB = Least Significant Bit = 0.806 mV at x1 gain
7 Pin groups are detailed following Table 17.
8 The current that can be injected or sourced from an unselected ADC signal input without affecting the performance of the ADC
9 ADC PGA gain is x1
Table 41. ADC Parameters1 (continued)
Parameter
Symbol
Min
Typ
Max
Unit
1
2
3
Analog input
S1
S2
C1
S/H
C1: Single Ended Mode
2XC1: Differential Mode
(VREFHx - VREFLx ) / 2
125-ohm ESD
resisto
r
S2
S1
Channel Mux
equivalent resistance
100 ohms
C1: Single Ended Mode
2XC1: Differential Mode
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