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NJM2257D

P1-P3P4-P6P7-P8
NJM2257
-1-
Ver.2004-02-17
NJM2257D NJM2257M
SYNCHRONOUS SEPARATOR WITH AFC
■
GENERAL DESCRIPTION
■
PACKAGE OUTLINE
The NJM2257 excutes Horizontal and Vertical synchronous signal
separation, and odd / even field signal detection, from composit video
signals.
Built-in 1 / 2 fH Killer Function circuit can make stabilization of the
Horizontal signal oscillation output during the vertical period.
■
FEATURES
● Operating Voltage (+4.5 to +5.3V)
● Internal AFC circuit (Horizontal sync. signal.)
● Internal 1 / 2 fH Killer Function
● AFC output Pulse Delay time is Adjustable
● Vertical synchronous pulse width is Adjustable
● Internal Field Discrlainat Function
● Package Outline DIP16, DMP16
● Bipolar Technology
■
APPLICATION
● VTR, TV, AV components etc.
■
BLOCK DIAGRAM
NJM2257
- 2 -
Ver.2004-02-17
■
ABSOLUTE MAXIMUM RATINGS (T
a
= 25°C)
■
ELECTRICAL CHARACTERISTICS (V
CC
= 5V, T
a
= 25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Quiessent Current I
Q
- 23.0 30.0 mA
AFC Free Run Frequency f
OH
15.54 15.74 15.94 KHz
none adjust
T
AHW1
SW=a 3.5 4.0 4.5
AFC HD pulse width
adjust T
AHW2
SW=b 2.5 4.0 5.5
µS
AFC HD Delet Time T
AHD
-1.0 0.5 2.0 µS
AFC Lock Range ∆f
HL
500 700 - Hz
AFC Cap Charange ∆f
HP
400 600 - Hz
H V
HAH
4.0 4.2 -
AFC Output Voltage
L V
HAL
- 0 0.1
V
Sync Sepa Sync. Separation Level V
HSR
- 0.16 0.18 V
Sync Sepa Delay Time T
HCD
0.05 0.20 0.35 µS
H V
HCH
4.0 4.2 -
Sync Sepa Output Voltage
L V
HCL
- 0 0.1
V
HD Output Palth Width T
HPW
4.0 5.5 7.0 µS
HD Output Delay Time T
HPD
0.35 0.6 0.8 µS
H V
HfH
4.0 4.2 -
HD Output Voltage
L V
HfL
- 0 0.1
V
V Sync Palth Width V
VW
170 190 210 µS
V Sync Delay Time T
VD
7.0 10.0 13.0 µS
H T
VH
4.0 4.2 -
V Sync Output Voltage
L V
VL
- 0 0.1
V
odd T
FOD
246 256 266
Field Distinction Delay Time
even T
FED
216 226 236
µS
odd V
FOR
4.0 4.2 -
Fideld Distinction Output
Voltage
even V
FER
- 0 0.1
V
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V
+
+7 V
Power Dissipation P
D
(DIP16) 500
(DMP16) 350
mW
mW
Operating Temperature Range T
opr
-20 to +75
°C
Storage Temperature Range T
stg
- 40 to +125
°C
NJM2257
-
3
-
Ver.2004-02-17
NJM2257
■
APPLICATION CIRCUIT
■
APPLICATION NOTES
It shows the characteristics by changing of the following resistor.
● The resistance between 9 Pin and GND
High resistance AFC HD pulse is wide
Low resistance AFC HD pulse is narrow
● The resistor between 9 Pin and V
+
At the resistor is 100Ω. AFC HD Delay adjustment is off, and AFC HD output width is 4µs (typ.)
● The resistor between 9 Pin and GND is fundamentally 14.2kΩ, because the purpose of this resistor is pulse width adjusts 4µs.
● The resistor between 10 Pin and GND
High resistance AFC HD Delay time gains
Low resistance AFC HD Delay time loses
● The resistor between 13 Pin and GND
High resistance Vsync pulse is wide
Low resistance Vsync pulse is narrow
● The resistor joind 2 Pin
Please adjust the wide of following W is from 33 µs to 37 µs (W = - (C·R)In0.5)
Fig 1 I / O PULSE
P1-P3P4-P6P7-P8

NJM2257D

Mfr. #:
Buy NJM2257D
Manufacturer:
NJR (New Japan Radio)
Description:
Video ICs Seperator w/ AFC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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