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參數(shù)資料
| 型號： | LC72191M |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO24 |
| 封裝： | MFP-24 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 318K |
| 代理商： | LC72191M |
Structure of the General-Purpose Counter
The LC72191 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, 12 or 24 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 LC72191 at the point the CE signal goes from high to low, the input to the HCTR or LCTR pin must be provided
within 2 ms after CE goes low.
No. 3985-12/16
LC72191, 72191M, 72191JM
Xtal
7.2 MHz
3.6 MHz
Time base clock
8 Hz
4 Hz
System clock
400 kHz
200 kHz
Frequency measurement time
24/12 ms
48/24 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)
24 m/12 ms
S2
01
LCTR
Frequency measurement
15 to 500 kHz (sine wave)
24 m/12 ms
S3
00
LCTR
Period measurement
1 Hz to 20 kHz (pulse wave)
Two periods/one period
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