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| 型号： | M52259EVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 39/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR 52259 COLDFIRE V2 |
| 产品培训模块： | ColdFire MCF5225x |
| 标准包装： | 1 |
| 系列： | ColdFire® |
| 类型： | MCU |
| 适用于相关产品： | MCF52259 |
| 所含物品： | 板，线缆，文档，DVD，闪光灯驱动和电源 |
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Electrical Characteristics
Table 25. ADC Parameters 1 (continued)
Name
SNR
THD
SFDR
SINAD
ENOB
Characteristic
Signal-to-noise ratio
Total harmonic distortion
Spurious free dynamic range
Signal-to-noise plus distortion
Effective number of bits
Min
—
—
—
—
9.1
Typical
62 to 66
? 75
67 to 70.3
61 to 63.9
10.6
Max
—
—
—
—
—
Unit
dB
dB
dB
dB
Bits
1
2
3
4
5
6
7
All measurements are preliminary pending full characterization, and made at V DD = 3.3 V, V REFH = 3.3 V, and V REFL = ground
INL measured from V IN = V REFL to V IN = V REFH
LSB = Least Significant Bit
INL measured from V IN = 0.1V REFH to V IN = 0.9V REFH
Includes power-up of ADC and V REF
ADC clock cycles
Current that can be injected or sourced from an unselected ADC signal input without impacting the performance of the ADC
2.16
Equivalent Circuit for ADC Inputs
Figure 14 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 and S3 is open, one input of the sample and hold circuit moves to (V REFH -V REFL )/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 (V REFH -V REFL )/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, V REF and the ADC clock frequency.
125W ESD Resistor
8pF noise damping capacitor
Analog Input
3
S1
4
S3
C1
S/H
1
2
(V REFH - V REFL )/ 2
S2
C2
C1 = C2 = 1pF
1.
2.
3.
4.
Parasitic capacitance due to package, pin-to-pin and pin-to-package base coupling; 1.8 pF
Parasitic capacitance due to the chip bond pad, ESD protection devices and signal routing; 2.04 pF
Equivalent resistance for the channel select mux; 100 ?
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; 1.4 pF
5.
Equivalent input impedance, when the input is selected =
1
(ADC Clock Rate) ? (1.4 ? 10 -12 )
Figure 14. Equivalent Circuit for A/D Loading
MCF52259 ColdFire Microcontroller, Rev. 5
39
Freescale
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M52259EVB | 制造商:Freescale Semiconductor 功能描述:MCF5225x Evaluation Board |
| M5226P | 制造商:Panasonic Industrial Company 功能描述:IC |
| M5226PFP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:5-ELEMENT GRAPHIC EQUALIZER IC |
| M52277EVB | 功能描述:开发板和工具包 - 其他处理器 EVAL BOARD FOR THE M52277x RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| M5228FP | 制造商:Panasonic Industrial Company 功能描述:IC |
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