- 您现在的位置：买卖IC网 > PDF目录80399 > MPC5604BF1CMG6R (FREESCALE SEMICONDUCTOR INC) MICROCONTROLLER, PBGA208 PDF资料下载
参数资料
| 型号： | MPC5604BF1CMG6R |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROCONTROLLER, PBGA208 |
| 封装： | 17 X 17 MM, 1 MM PITCH, PLASTIC, MO-151AAF-1, MAPBGA-208 |
| 文件页数： | 74/104页 |
| 文件大小： | 953K |
| 代理商： | MPC5604BF1CMG6R |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页当前第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页
Electrical characteristics
MPC5604B/C Microcontroller Data Sheet, Rev. 9
Freescale Semiconductor
71
1. A first and quick charge transfer from the internal capacitance CP1 and CP2 to the sampling capacitance CS occurs (CS
is supposed initially completely discharged): considering a worst case (since the time constant in reality would be
faster) in which CP2 is reported in parallel to CP1 (call CP = CP1 + CP2), the two capacitances CP and CS are in series,
and the time constant is
Eqn. 5
Equation 5 can again be simplified considering only CS as an additional worst condition. In reality, the transient is
faster, but the A/D converter circuitry has been designed to be robust also in the very worst case: the sampling time ts
is always much longer than the internal time constant:
Eqn. 6
The charge of CP1 and CP2 is redistributed also on CS, determining a new value of the voltage VA1 on the capacitance
according to Equation 7:
Eqn. 7
2. A second charge transfer involves also CF (that is typically bigger than the on-chip capacitance) through the resistance
RL: again considering the worst case in which CP2 and CS were in parallel to CP1 (since the time constant in reality
would be faster), the time constant is:
Eqn. 8
In this case, the time constant depends on the external circuit: in particular imposing that the transient is completed
well before the end of sampling time ts, a constraints on RL sizing is obtained:
Eqn. 9
Of course, RL shall be sized also according to the current limitation constraints, in combination with RS (source
impedance) and RF (filter resistance). Being CF definitively bigger than CP1, CP2 and CS, then the final voltage VA2
(at the end of the charge transfer transient) will be much higher than VA1. Equation 10 must be respected (charge
balance assuming now CS already charged at VA1):
Eqn. 10
The two transients above are not influenced by the voltage source that, due to the presence of the RFCF filter, is not able to
provide the extra charge to compensate the voltage drop on CS with respect to the ideal source VA; the time constant RFCF of
the filter is very high with respect to the sampling time (ts). The filter is typically designed to act as anti-aliasing.
1 RSW RAD
+
=
CP CS
CP CS
+
---------------------
1 RSW RAD
+
CS ts
VA1 CS CP1 CP2
++
VA CP1 CP2
+
=
2 RL
CS CP1 CP2
++
10
2
10 RL CS CP1 CP2
++
=
ts
VA2 CS CP1 CP2 CF
++
+
VA CF
VA1
+CP1 CP2
+CS
+
=
相关PDF资料 |
PDF描述 |
|---|---|
| MAC7131MVF50XX | MICROCONTROLLER, PBGA208 |
| MB9AF112MPMC | 32-BIT, FLASH, RISC MICROCONTROLLER, PQFP80 |
| MCF51AG128VQH | RISC MICROCONTROLLER, PQFP64 |
| MCF51AG128VQH | MICROCONTROLLER, PQFP80 |
| MCF51AG96VLK | RISC MICROCONTROLLER, PQFP80 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC5604BF1MLL6 | 制造商:Freescale Semiconductor 功能描述:MPC5604BF1MLL6 - Bulk |
| MPC5604BF1MLL6R | 制造商:Freescale Semiconductor 功能描述:MPC5604BF1MLL6R - Tape and Reel |
| MPC5604BF1MLQ6 | 制造商:Freescale Semiconductor 功能描述:MPC5604BF1MLQ6 - Bulk 制造商:Freescale Semiconductor 功能描述:MCU 32BIT 512KB FLASH 144LQ |
| MPC5604BF1MLQ6R | 制造商:Freescale Semiconductor 功能描述:MPC5604BF1MLQ6R - Tape and Reel |
| MPC5604BMLL4R | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:MPC5604B/C Microcontroller |
发布紧急采购，3分钟左右您将得到回复。