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參數(shù)資料
| 型號： | LC72151V |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO30 |
| 封裝： | SSOP-30 |
| 文件頁數(shù)： | 5/29頁 |
| 文件大?。?/td> | 326K |
| 代理商： | LC72151V |
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No. 6976-13/29
LC72151V
No.
Control block/data
Content
Related data
Selects the general-purpose counter input pins (HCTR, LCTR).
General-purpose counter measurement start data
CTE = 1: Starts the counter.
CTE = 0: Resets the counter.
Determines the measurement time (frequency mode) and number of periods (period
mode).
When CTE = 0, input pull-down is disabied by setting CTP to 1
Note: Wait time: 1 to 2ms.
However, CTP must be set to 1 4ms before CTE is set to 1.
The input sensitivity is reduced when CTC is set to 1. (Sensitivity: 10 to 30 mV rms)
*: Refer to the General-purpose counter stracture on page 22 for details.
(5)
General-purpose counter
control data
CTS0, CTS1
CTE
GT0, GT1
CTP
CTC
Data that specifies the I/O direction of the I/O ports (I/O-1, I/O-2).
[Data] = 0: Input port
1: Output port
*: After the power-on reset, the I/O-1 and I/O-2 are set up as input ports.
OUT1, OUT2
(6)
I/O port control data
IO-1, I/O-2
Data that determines the output from output ports O-1 to O-3.
[Data] = 0: Open
1: Low
*: Invalid when the corresponding port is set up as an input port.
*: At a power-on reset, open state is selected by selling the data to 0
I/O-1, I/O-2
(7)
Output port data
OUT1 to OUT3
Data that switch the function between general-purpose counter and input port.
H/I-3 = 0: I-3 (input port)
1: HCTR (gereal-purpose counter)
L/I-4 =
0: I-4 (input port)
1: LCTR (gereal-purpose counter)
CTS0, CTS1
(8)
General-purpose counter
control data
H/I-3, L/I-4
Continued from preceding page.
Frequency measurement
Period measurement
GT1
GT0
Measurement time
Wait time
mode
CTP = 0
CTP = 1
0
4 ms
3 to 4 ms 1 to 2 ms
One period
0
1
8
3 to 4 ms 1 to 2 ms
One period
1
0
32
7 to 8 ms 1 to 2 ms
Two periods
1
64
7 to 8 ms 1 to 2 ms
Two periods
Continued on next page.
CTS1
CTS0
Input pin
Measurement mode
1
*
HCTR
Frequency
0
1
LCTR
Frequency
0
LCTR
Period
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