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参数资料
| 型号： | LC7218M |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO24 |
| 封装： | MFP-24 |
| 文件页数： | 4/16页 |
| 文件大小： | 282K |
| 代理商： | LC7218M |
Structure of the General-Purpose Counter
The LC7218 general-purpose counter is a 20-bit binary counter.
The value of the counter can be read out, msb first, from the DO pin.
When the general-purpose counter is used for frequency measurement, GT selects the measurement period to be one of
two periods, 60 or 120 ms. The frequency of the signal input to the HCTR or LCTR pin can be measured by determining
the number of pulses input to the general-purpose counter during the measurement period.
When the general-purpose counter is used for period measurement, the period of the signal input to the LCTR pin can be
measured by determining the number of check signal (900 kHz) cycles input to the general-purpose counter during one
or two periods of the signal input to the LCTR pin.
The general-purpose counter is started by setting CTEN to 1 in the serial data. While the serial data is acquired internally
in the LC7218 at the point the CE signal goes from high to low, the input to the HCTR or LCTR pin must be provided
within 10 ms after CE goes low.
No. 4758-12/16
LC7218, 7218M, 7218JM
Item
Xtal
7.2 MHz
3.6 MHz
Time base clock
8 Hz
4 Hz
System clock
400 kHz
200 kHz
Frequency measurement period
120/60 ms
240/120 ms
Frequency measurement check signal
900 kHz
450 kHz
Reference frequencies
100, 50, 25, ......... 10, 9, 5, 1 kHz
50, 25, 12, 5, .......... 5, 4.5, 2.5, 0.5 kHz
Serial data I/O (CL)
t1 ≥ 1.5 s, t3 ≥ 1.5 s
t1 ≥ 3.0 s, t3 ≥ 3.0 s
SC
SF
Input pin
Measurement item
Measurement frequency range
GT (1/0)
S1
1
*
HCTR
Frequency measurement
10 to 60 MHz (sine wave)
120 m/60 ms
S2
01
LCTR
Frequency measurement
15 to 500 kHz (sine wave)
120 m/60 ms
S3
00
LCTR
Period measurement
1 Hz to 20 kHz (pulse wave)
Two periods/one period
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相关代理商/技术参数 |
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|---|---|
| LC7218M-TLM-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LC7219 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizers |
| LC72191 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning in Car Stereo Tuners |
| LC72191JM | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning in Car Stereo Tuners |
| LC72191JMA-AH | 功能描述:时钟合成器/抖动清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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