参数资料
型号: MCF52223CVM66
厂商: Freescale Semiconductor
文件页数: 32/55页
文件大小: 0K
描述: IC MCU 256K FLASH 66MHZ 81MAPBGA
标准包装: 240
系列: MCF5222x
核心处理器: Coldfire V2
芯体尺寸: 32-位
速度: 66MHz
连通性: I²C,SPI,UART/USART,USB OTG
外围设备: DMA,LVD,POR,PWM,WDT
输入/输出数: 56
程序存储器容量: 256KB(256K x 8)
程序存储器类型: 闪存
RAM 容量: 32K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 8x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 81-LBGA
包装: 托盘
Electrical Characteristics
MCF52223 ColdFire Microcontroller, Rev. 3
Freescale Semiconductor
38
2.13
Equivalent Circuit for ADC Inputs
Figure 9 shows 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-VREFL)/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-VREFL)/2. The switches
switch on every cycle of the ADC clock (open one-half ADC clock, closed one-half ADC clock). 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
XIN
Input impedance
—W
IADI
Input injection current7, per pin
3
mA
IVREFH
VREFH current
0
mA
VOFFSET Offset voltage internal reference
8
15
mV
EGAIN
Gain error (transfer path)
.99
1
1.01
VOFFSET Offset voltage external reference
39
mV
SNR
Signal-to-noise ratio
62 to 66
dB
THD
Total harmonic distortion
75
dB
SFDR
Spurious free dynamic range
67 to 70.3
dB
SINAD
Signal-to-noise plus distortion
61 to 63.9
dB
ENOB
Effective number of bits
9.1
10.6
Bits
1 All measurements are made at V
DD = 3.3V, VREFH = 3.3V, and VREFL = ground
2 INL measured from V
IN = VREFL to VIN = VREFH
3 LSB = Least Significant Bit
4 INL measured from V
IN = 0.1VREFH to VIN = 0.9VREFH
5 Includes power-up of ADC and V
REF
6 ADC clock cycles
7 Current that can be injected or sourced from an unselected ADC signal input without impacting the performance of the ADC
Table 35. ADC Parameters1 (continued)
Name
Characteristic
Min
Typical
Max
Unit
1
2
3
Analog Input
4
S1
S2
S3
C1
C2
S/H
C1 = C2 = 1pF
(VREFH- VREFL)/ 2
125W ESD Resistor
8pF noise damping capacitor
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