NJM2225S(2004) 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM2225S Datasheet PDF : 11 Pages
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■ TYPICAL APPLICATION
NJM2225
■ BRIEF OPERATION PRINCIPLE
Input luminance signal to clip circuit.
(Pin 2)
↓
Clip with Pin 3 level, and output to.
(Pin 6)
↓
Integration with external R, C.
X→DC level conversion
↓
Input to driver amp.
↓
(Pin 7)
↓
Pin 8 level>X
DAMP (L1) DRIVER(L2)
OFF
ON
Iris Open
↓
Pin 8 level<X
DAMP (L1) DRIVER(L2)
ON
OFF
Iris Close
↓
To comparator (1)
AGC output LOW→ 0V
To comparator (1)
AGC output HIGH→ 4V
(Pin 12)
Luminance signal clamped at 1.9V.
Pin 3 level LOW →2.35V
HIGH→2.90V
Ext. circuit R : 2.7kΩ
C : 3.3µF
Adjsut Pin 8 level with external
variable resistor
(Iris threshold)
DAMP (L1)
DRIVER (L2) Iris Motor
AGC Output level:
LOW 0V
HIGH 4V
(at 15kΩ load)
Ver.2004-02-17
-7-
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