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參數(shù)資料
| 型號(hào)： | MC68HC908GR8CP |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 273/286頁(yè) |
| 文件大?。?/td> | 3708K |
| 代理商： | MC68HC908GR8CP |
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Acquisition/Lock Time Specifications
MC68HC908GR8 MC68HC908GR4 Data Sheet, Rev. 7
Freescale Semiconductor
87
7.8.2 Parametric Influences on Reaction Time
Acquisition and lock times are designed to be as short as possible while still providing the highest possible
stability. These reaction times are not constant, however. Many factors directly and indirectly affect the
acquisition time.
The most critical parameter which affects the reaction times of the PLL is the reference frequency, fRDV.
This frequency is the input to the phase detector and controls how often the PLL makes corrections. For
stability, the corrections must be small compared to the desired frequency, so several corrections are
required to reduce the frequency error. Therefore, the slower the reference the longer it takes to make
these corrections. This parameter is under user control via the choice of crystal frequency fXCLK and the
R value programmed in the reference divider. (See 7.3.3 PLL Circuits, 7.3.6 Programming the PLL, and
Another critical parameter is the external filter network. The PLL modifies the voltage on the VCO by
adding or subtracting charge from capacitors in this network. Therefore, the rate at which the voltage
changes for a given frequency error (thus change in charge) is proportional to the capacitance. The size
of the capacitor also is related to the stability of the PLL. If the capacitor is too small, the PLL cannot make
small enough adjustments to the voltage and the system cannot lock. If the capacitor is too large, the PLL
may not be able to adjust the voltage in a reasonable time. (See 7.8.3 Choosing a Filter.)
Also important is the operating voltage potential applied to VDDA. The power supply potential alters the
characteristics of the PLL. A fixed value is best. Variable supplies, such as batteries, are acceptable if
they vary within a known range at very slow speeds. Noise on the power supply is not acceptable,
because it causes small frequency errors which continually change the acquisition time of the PLL.
Temperature and processing also can affect acquisition time because the electrical characteristics of the
PLL change. The part operates as specified as long as these influences stay within the specified limits.
External factors, however, can cause drastic changes in the operation of the PLL. These factors include
noise injected into the PLL through the filter capacitor, filter capacitor leakage, stray impedances on the
circuit board, and even humidity or circuit board contamination.
7.8.3 Choosing a Filter
As described in 7.8.2 Parametric Influences on Reaction Time, the external filter network is critical to the
stability and reaction time of the PLL. The PLL is also dependent on reference frequency and supply
voltage.
Figure 7-10 shows two types of filter circuits. In low-cost applications, where stability and reaction time of
the PLL are not critical, the three component filter network of Figure 7-10 (B) can be replaced by a single
capacitor, CF, shown in Figure 7-10 (A). Refer to Table 7-4 for recommended filter components at various
reference frequencies. For reference frequencies between the values listed in the table, extrapolate to the
nearest common capacitor value. In general, a slightly larger capacitor provides more stability at the
expense of increased lock time.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC908GR4MDW | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC908GR4VDW | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PDSO28 |
| MC908GR8CDWR2 | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PDSO28 |
| MC908GR4MDWR2 | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC908GR4CFA | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PQFP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC908GR8MFA | 制造商:Motorola Inc 功能描述: |
| MC68HC908GR8VFA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HC908GT16CB | 功能描述:IC MCU 16K FLASH 8MHZ SPI 42-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC08 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC908GT16CFB | 功能描述:IC MCU 16K FLASH 8MHZ SPI 44PQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC08 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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