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參數(shù)資料
| 型號(hào)： | LC72713W |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, SQFP-64 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大小： | 201K |
| 代理商： | LC72713W |
LC72131K, 72131KM
No.A0788-17/22
Figure 2 Circuit Structure
Figure 3
Unlocked State Data Output Using Serial Data Output
In the LC72131, once an unlocked state occurs, the unlocked state serial data (UL) will not be reset until a data
input (or output) operation is performed. At the data output (1) point in Figure 3, although the VCO frequency has
stabilized (locked), since no data output has been performed since the divisor N was changed the unlocked state
data remains in the unlocked state. As a result, even though the frequency has stabilized (locked), the system
remains (from the standpoint of the data) in the unlocked state.
Therefore, the unlocked state data acquired at data output (1), which occurs immediately after the divisor N was
changed, should be treated as a dummy data output and ignored. The second data output (data output (2)) and
following outputs are valid data.
<Locked State Determination Flowchart Example>
VCO
UNLOCK
L.P.F
φERROR
Phase
comparator
DATA LATCH
÷N
UNLOCK
detection circuit
÷R
Preset
VCO/N
fref
Data output (2)
Data input
Data output (1)
New data
Old data
VCO
frequency
Locked
Unlocked
φERROR
N
Unlock detection
pin output
Unlock (UL)
serial data output
CE
Valid data can be output at
intervals of one reference
frequency period or longer.
*: Locking state determination is
more reliable if it is based on
reading valid output data several
times
Wait for at least two reference
frequency periods.
Divisor N modification
(data input)
locked
*
NO
YES
Valid data output
Dummy data output
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