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參數(shù)資料
| 型號： | LC72133V |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大小： | 147K |
| 代理商： | LC72133V |
IF Counter Structure
The LC72133 IF counter is a 20-bit binary counter. The result, i.e., the counter’s MSB, can be read serially from the DO
pin.
The IF frequency (Fc) is measured by determining how many pulses were input to an IF counter in a specified
measurement period, GT.
Fc =
(C = Fc
× GT)
C: Count value (number of pulses)
1. IF Counter Frequency Calculation Examples
When the measurement period (GT) is 32 ms, the count (C) is 53980 hexadecimal (342400 decimal):
IF frequency (Fc) = 342400
÷ 32 ms = 10.7 MHz
When the measurement period (GT) is 8 ms, the count (C) is E10 hexadecimal (3600 decimal):
IF frequency (Fc) = 3600
÷ 8 ms = 450 kHz
C
GT
No. 5427-16/23
LC72133M, 72133V
GT1
GT0
Measurement time
Measurement period (GT) (ms)
Wait time (twu) (ms)
0
4
3 to 4
0
1
8
3 to 4
1
0
32
7 to 8
1
64
7 to 8
L
S
B
M
S
B
0 to 3
4 to 7
8 to 11 12 to 15 16 to 19
CTE
DO pin
(C)
A11932
C = Fc
× GT
(Fc)
(GT)
GT0
GT1
4/8/32/64
ms
IFIN
A11933
5398
0
01010011100110000000
I2
I1
UL
C19
C18
C17
C16
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
A11934
0
0E1
0
00000000111000010000
I2
I1
UL
C19
C18
C17
C16
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
IF counter
(20-bit binary counter)
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