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NJM2267
DUAL VIDEO 6dB AMPLIFIER WITH 75DRIVER
GENERAL DESCRIPTION
NJM2267 is a dual video 6dB amplifier with 75drivers for S-VHS
VCRs, HI-BAND VCRs, etc..Each channel has clamp function that
fixes DC level of video signal and 75drivers to be connected to TV
monitors directly. Further more it has sag corrective circuits that
prevent the generation of sag with smaller capacitance than ever.
Its operating supply voltage is 4.85 to 9V and bandwidth is 7MHz.
FEATURES
Wide Operating Voltage (4.85V to 9.0V)
Dual Channel
Internal Clamp Function
Internal Driver Circuit For 75Load
SAG Corrective Function
Wide Frequency Range (7MHz)
Low Operating Current 14.0mA (Dual)
Package Outline DIP8, DMP8, SSOP8
Bipolar Technology
APPLICATIONS
VCR, Video Camera, TV, Video Disc Player.
BLOCK DIAGRAM
PACKAGE OUTLINE
NJM2267D
NJM2267M
NJM2267V
Ver.2012-01-16
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NJM2267
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
SYMBOL
V+
PD
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
RATINGS
10
(DIP8) 500
(DMP8) 300
(SSOP8) 250
-40 to +85
-40 to +125
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
Operating Current
ICC No Signal
Voltage Gain
GV VIN=1MHz, 1VP-PSinewave
Frequency Characteristics
Gf VIN=1VP-P, Sinewave, 7MHz / 1MHz
Differential Gain
DG VIN=1VP-P, Staircase
Differential Phase
DP VIN=1VP-P, Staircase
Crosstalk
CT VIN=4.43MHz, 1VP-P, Sinewave
Gain Offset
GCH
VIN=1MHz, 1VP-P, GCH=VOUT1-VOUT2
Input Clamp Voltage
VCL
SAG Terminal Gain
GSAG
(Ta=25°C)
UNIT
V
mW
mW
mW
°C
°C
(V+=5V, Ta=25±2°C)
MIN. TYP. MAX. UNIT
- 14.0 18.2 mA
5.7 6.2 6.7 dB
- - ±1.0 dB
-
1.0 3.0
%
- 1.0 3.0 deg
- -70 - dB
- - ±0.5 dB
1.79 1.91 2.03
V
35 45 - dB
APPLICATION
Oscillation Prevention
It is much effective to insert LPF (Cutoff Frequency 70MHz) under light loading conditions (RL » 1k)
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Ver.2012-01-16

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NJM2267
TERMINAL FUNCTION
PIN No. PIN NAME SYMBOL
1 Input
Clamp
VIN1
Terminal
EQUIVALENT CIRCUIT
(V+=5.0V, Ta=25°C)
FUNCTIONS
Input terminal of 1VP-Pcomposite signal or Y signal.
Clamp level is 1.9V
2 GND
GND
3 SAG
VSAG1
correction
4 Video
VOUT1
Output1
Ground
SAG caused by a coupling capacitor of the output can be
prevented by connecting this terminal with the output terminal
through an external capacitor.(see block diagram)
When SAG correcting function is not necessary, this terminal
must be connected with pin “4” directly.
Output terminal that can drive 75line.
5 Video
VOUT2
Output2
Output terminal that can drive 75line.
6 SAG
VSAG2
correction
7 V+
V+
8 Input
Clamp
VIN2
Terminal
SAG caused by a coupling capacitor of the output can be
prevented by connecting this terminal with the output terminal
through an external capacitor.(see block diagram)
When SAG correcting function is not necessary, this terminal
must be connected with pin “5” directly.
Supply Voltage
Input terminal of 1VP-Pcomposite signal or Y signal.
Clamp level is 1.9V
Ver.2012-01-16
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NJM2267
TEST CIRCUIT
TEST METHODES
PARAMETER
Supply Current
Voltage Gain
Frequency
Characteristic
Differential Gain
Differential Phase
Crosstalk
Gain Offset
Input Clamp Voltage
SAG Terminal Gain
SYMBOL
ICC
GV
Gf
DG
DP
CT
GCH
VCL
GSAG
SWITCH CONDITIONS
S1 S2 S3 S4 S5 S6
HH
H H ON ON
H H ON ON
H H ON ON
H H ON ON
H L ON ON
H H ON ON
HH
HH
HH
ON ON
CONDITIONS
7PIN Sink Current
VOUT1 / VIN, VOUT2 / VIN2
at VIN1(VIN2)=1MHz, 1VP-P, Sinewave
GV1M; Voltage Gain at VIN1 (VIN2)=1MHz, 1VP-P
GV10M; Voltage Gain at VIN1 (VIN2)=7MHz, 1VP-P
Gf =GV10M-GV1M
Measuring VOUT3 at VIN1=Staircase Signal
Measuring VOUT3 at VIN1=Staircase Signal
VOUT2 / VOUT1 at VIN1=4.43MHz, 1VP-P, Sinewave
VOUT1 / VIN2at VIN12=4.43MHz, 1VP-P, Sinewave
GV1=VOUT1 / VIN1, GV2=VOUT2 / VIN2
GCH=GV1-GV2
Measuring at TP1 (TP2)
TP3 (TP4) Voltage; Vo1A (Vo2A), TP5 (TP6) voltage;
Vso1A (Vso2A)
TP3 (TP4) Voltage; Vo1B(Vo2B), TP5 (TP6) voltage;
Vso1B (Vso2B)
GSAG=20log{ (Vo1B-Vo1A) / (Vso1A-Vso1B) }
GSAG=20log{ (Vo2B-Vo2A) / (Vso2A-Vso2B) }
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Ver.2012-01-16

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NJM2267
Clamp circuit
1. Operation of Sync-tip-clamp
Input circuit will be explained. Sync-tip clamp circuit (below the clamp circuit) operates to keep a sync tip of the minimum
potential of the video signal. Clamp circuit is a circuit of the capacitor charging and discharging of the external input Cin. It is
charged to the capacitor to the external input Cin at sync tip of the video signal. Therefore, the potential of the sync tip is fixed.
And it is discharged charge by capacitor Cin at period other than the video signal sync tip. This is due to a small discharge
current to the IC.
In this way, this clamp circuit is fixed sync tip of video signal to a constant potential from charging of Cin and discharging of
Cin at every one horizontal period of the video signal.
The minute current be discharged an electrical charge from the input capacitor at the period other than the sync tip of video
signals. Decrease of voltage on discharge is dependent on the size of the input capacitor Cin.
If you decrease the value of the input capacitor, will cause distortion, called the H sag. Therefore, the input capacitor
recommend on more than 0.1uF.
signal input
charge
Cin current
Vin
diccharge
current
< Clamp circuit >
Clamp circuit
A. Cin is large
B. Cin is small (H sag experience)
clamp potential
charge period
discharge period
charge period charge period
clamp potential
discharge period
charge period
< Waveform of input terminal >
2. Input impedance
The input impedance of the clamp circuit is different at the capacitor discharge period and the charge period.
The input impedance of the charging period is a few k. On the other hand, the input impedance of the discharge period is
several M. Because is a small discharge-current through to the IC.
Thus the input impedance will vary depending on the operating state of the clamp circuit.
3. Impedance of signal source
Source impedance to the input terminal, please lower than 200. A high source impedance, the signal may be distorted. If
so, please to connect a buffer for impedance conversion.
Ver.2012-01-16
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