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參數資料
| 型號： | LA7945N |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP22 |
| 封裝： | SDIP-22 |
| 文件頁數： | 5/9頁 |
| 文件大小： | 150K |
| 代理商： | LA7945N |
LA7945N
No.4616–5/9
Pin Descriptions
* The peripheral circuit for the pins described below is shown in figure 1.
Either a resistor or a fixed current supply is connected to the lower side
(the side away from the pin) of the differential amplifier.
Pin 1 (21H OUT) : R=18k
. This signal goes high during the 21H and
284H periodes. The fall of this signal is taken as the completion of
data transfer.
Pin 2 (sync SEP) : R=9k
. Synchronization separation output, see pin
19.
Pin 3 (DATA OUT) : I
≈280A.
Outputs the data overlapped with the vertical retrace period.
Pin 5 (CLOCK OUT) : R=9k
. A clock output whose phase matches that
of DATA OUT.
Pin 6 (O/E OUT) : R=18k
. Field discrimination signal. High on odd
fields.
Pin 7 (H LOCK OUT) : I
≈50A.
A resistor and capacitor are connected to pin 8, and this pin goes
high when the internal VCO and the input signal are synchronized.
Pin 9 (V PULSE OUT) : R=18k
. Set low during the 0.5H period
synchronized with the vertical synchronization signal.
Pin 10 (H PULSE OUT) : R=18k
. Outputs a low signal synchronized
with the horizontal synchronization signal.
Pin 8 is charged when the H gate and Sync phases match, and this voltage
is compared and output to pin 7. The resistor R1 is used for discharge. The
time from internal VCO locking until pin 7 goes high, and the time from
lock release to the pin going low can be adjusted by changing the values of
C1 and R1. If the pin 7 H LOCK OUT output is not used, C1 and R1 will
be unnecessary.
Pin 8 (H LOCK FILTER) : The H LOCK detection filter is connected to this pin.
Figure 1
Pin 11 (VCO C) : The capacitor for the 32fH VCO is connected to this pin. (Error : 5%)
Figure 2 : Pin 8 (H LOCK FILTER) Peripheral Circuit
The LA7945N generates the 32fH oscillation not by using a ceramic resona-
tor, but by charging this capacitor with the fixed current defined by the resis-
tance connected at pin 12. The horizontal pulses and the clock output from
pin 5 are generated using this oscillator as a reference.
Figure 3 : Pin 11 (VCO C) Peripheral Circuit
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