參數(shù)資料
型號(hào)： LC72144M
廠(chǎng)商： Sanyo Electric Co.,Ltd.
英文描述： PLL Frequency Synthesizer(鎖相環(huán)頻率合成器)
中文描述： 鎖相環(huán)頻率合成器（鎖相環(huán)頻率合成器）
文件頁(yè)數(shù)： 16/22頁(yè)
文件大小： 308K
代理商： LC72144M
Check Signal Frequency
Note:
*
CTC = 0: 40 mVrms
CTC = 1: 70 mVrms
However, the frequency ranges will be as follows when CTC is 1.
HCTR: 8 to 12 MHz, LCTR: 400 to 500 kHz
The CTC data is input sensitivity switching data, and the input sensitivity is degraded when CTC is set to 1.
—:
( ): Actual performance estimates (reference values)
Not stipulated (not included in device guarantee)
The CTP data determines the state of the general-purpose counter input pin (HCTR/LCTR) when the general-purpose
counter is reset (CTE = 0).
CTP = 0: The general-purpose counter input pin is pulled down.
= 1: The wait time is shortened to 1 to 2 ms by not pulling down the general-purpose counter input pin.
If CTP is set to 1, is must be set to 1 at least 4 ms before a count start (CTE = 1) is issued.
CTP must be set to and left at 0 if the counter is not used.
IF Counter Operation
Before starting a count operation with the general-purpose counter, reset that counter by setting CTE to 0.
A general-purpose counter count operation is started by setting the CTE bit in the serial data to 1. Although the serial
data is loaded into the LC72144M internal registers by changing the level on the CE input pin from high to low, the
input to the HCTR or LCTR pin must be provided within the wait period that follows the point when CE goes low at the
latest.
Next, the count result in the general-purpose counter after the measurement completes must be read out in the period
when CTE is 1, since the general-purpose counter is reset when CTE is set to 0.
Also note that although the signal input to the LCTR pin is transmitted directly to the general-purpose counter, the signal
input to the HCTR pin is only transmitted to the general-purpose counter after first being divided by two internally. Thus
the value of the result in the general-purpose counter is 1/2 the actual frequency of the signal input to the HCTR pin.
No. 5377-16/22
LC72144M
CTS1
CTS0
Input pin
Measurement mode
Frequency range
Input sensitivity
S1
1
HCTR
Frequency
0.4 to 25.0 MHz
40 mVrms
*
S2
0
1
LCTR
Frequency
10 to 500 kHz
4.0 to 20
×
10
3
Hz
40 mVrms
*
S3
0
0
LCTR
Period
(pulse)
HCTR: Minimum input sensitivity rating [f (MHz)]
0.4
≤
f < 8
8
≤
f < 12
40 mVrms
(1 to 10 mVrms)
LCTR: Minimum input sensitivity rating [f (kHz)]
10
≤
f < 400
CTC
12
≤
f < 25
400
≤
f < 500
20 mVrms
(0.1 to 3 mVrms)
0 (normal mode)
40 mVrms
40 mVrms
40 mVrms
1 (degraded mode)
—
70 mVrms
(30 to 40 mVrms)
—
—
70 mVrms
(10 to 15 mVrms)
10.35 MHz
Xtal OSC
4.5 MHz
7.2 MHz
10.25 MHz
fref = 30, 9, 3 kHz
fref: A frequency other than
3, 9, or 30 kHz
Check signal
900 kHz
900 kHz
1025 kHz
1030 kHz
1150 kHz
Frequency measurement mode
Period measurement
mode
GT1
GT0
Measurement time
(ms)
Wait time (ms)
CTP = 0
CTP = 1
0
0
4
3 to 4
1 to 2
1 period
0
1
8
3 to 4
1 to 2
1 period
1
0
32
7 to 8
1 to 2
2 periods
1
1
64
7 to 8
1 to 2
2 periods
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