NJM2268
DUAL VIDEO 6dB AMPLIFIER WITH 75Ω DRIVER
■ GENERAL DESCRIPTION
NJM2268 is a dual video 6dB amplifier with 75Ω drivers for S-VHS
VCRs, HI-BAND VCRs, etc..One channel has clamp function that
fixes DC level of video signal and another one is bias type.
Furthermore it has 75Ω drivers to be connected to TV monitors
directly and 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 (4.85 to 9.0V)
● Dual Channel (Clamp Type, Bias Type)
● Internal Driver Circuit For 75Ω Load
● SAG Corrective Function
● Wide Frequency Range 7MHz
● Low Operating Current 14.0mA (Dual)
● Package Outline DIP8, DMP8, SSOP8
● Bipolar Technology
■ PACKAGE OUTLINE
NJM2268D
NJM2268M
NJM2268V
■ RECOMMENDED OPERATING CONDITION
● Operating Voltage
V+
4.85 to 9.0V
■ APPLICATIONS
● VCR,Video Camera, TV, Video Disc Player
■ BLOCK DIAGRAM
Ver.2004-02-17
-1-
NJM2268
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
(Ta=25°C)
SYMBOL
+
RATINGS
UNIT
V
mW
mW
mW
Supply Voltage
Power Dissipation
V
PD
Operating Temperature Range
Topr
10
(DIP8) 500
(DMP8) 300
(SSOP8) 250
-40 to +85
Storage Temperature Range
Tstg
-40 to +125
°C
°C
(V+=5V, Ta=25°C)
■ ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
-
14.0
18.2
mA
5.7
6.2
6.7
dB
Operating Current
ICC
No Signal
Voltage Gain
GV
VIN=1MHz, 1VP-PSinewave
Frequency Characteristic
Gf
VIN=1VP-P, Sinewave, 7MHz / 1MHz
-
-
±1.0
dB
Differential Gain*
DG
VIN=1VP-P, Staircase
-
1.0
3.0
%
Differential Phase*
DP
VIN=1VP-P, Staircase
-
1.0
3.0
deg
Crosstalk
CT
VIN=4.43MHz, 1VP-P, Sinewave
-
-70
-
dB
Gain Offset
GCH
VIN=1MHz, 1VP-P, GCH=VOUT1-VOUT2
-
-
±0.5
dB
Input Clamp Voltage
VCL
1.79
1.91
2.03
V
Input Bias Voltage
VBt
2.56
2.84
3.12
V
SAG Terminal Gain
GSAG
35
45
-
dB
NOTE: “*” is applied to clamp type input side only /
■ APPLICATION
Oscillation Prevention
It is much effective to insert LPF (Cutoff Frequency 70MHz) under light loading conditions (RL » 1kΩ).
This IC requires 1MΩ resistance between INPUT and GND pin for clamp type input since
the minute current causes an unstable pin voltage.
-2-
Ver.2004-02-17
NJM2268
■ TEST CIRCUIT
■ TEST METHODES
PARAMETER
SYMBOL
SWITCH CONDITIONS
S1
S2
S3
S4
S5
CONDITIONS
S6
Supply Current
Voltage Gain
ICC
GV
H
H
H
H
ON
ON
Frequency Characteristic
Gf
H
H
ON
ON
VOUT1 / VIN1, VOUT2 / VIN2
at VIN1(VIN2)=1MHz, 1VP-P, Sinewave
GV1M; Voltage Gain at VIN1 (VIN2)=1MHz, 1VP-P
GV10M; Voltage Gain at VIN1 (VIN2)=10MHz, 1VP-P
Gf =GV10M-GV1M
Differential Gain
DG
H
H
ON
ON
Measuring VOUT3 at VIN1=Staircase Signal
Differential Phase
Crosstalk
DP
CT
H
H
ON
ON
Measuring VOUT3 at VIN1=Staircase Signal
H
L
ON
ON
VOUT2 / VOUT1 at VIN1=4.43MHz, 1VP-P, Sinewave
VOUT1 / VIN2 at VIN2=4.43MHz, 1VP-P, Sinewave
Gain Offset
GCH
H
H
ON
ON
GV1=VOUT1 / VIN1, GV2=VOUT2 / VIN2
GCH=GV1-GV2
Input Clamp Voltage
VCL
H
H
Measuring at TP1
Input Bias Voltage
SAG Terminal Gain
VBt
GSAG
H
H
Measuring at TP2
H
H
H
H
Ver.2004-02-17
7PIN Sink Current
ON
ON
TP3 Voltage; VO1A, TP5 Voltage; VSO1A
TP3 Voltage; VO1B, TP5 Voltage; VSO1B
GSAG=20log { (VO1B-VO1A) / (VSO1A-VSO1B) }
-3-
NJM2268
(V+=5.0V, Ta=25°C)
■ TERMINAL FUNCTION
PIN No.
1
PIN NAME
Input
Clamp
Terminal
SYMBOL
VIN1
2
3
GND
SAG
correction
GND
VSAG1
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.
4
Video
Output1
VOUT1
Output terminal (clamp side) that can drive 75Ω line.
5
Video
Output2
VOUT2
Output terminal (bias side) that can drive 75Ω line.
6
No
Connection
+
V
Input
Clamp
Terminal
NC
7
8
-4-
+
V
VIN2
EQUIVALENT CIRCUIT
FUNCTIONS
Input terminal of 1VP-P composite
Signal or Y signal.
Clamp level is 1.9V
Supply Voltage
Input terminal of 1VP-P coler signal. Bias level is 2.8V.
Ver.2004-02-17
NJM2268
■ TYPICAL CHARACTERISTICS
Operating Current vs. Ta
Output DC Level vs. Ta
SAG Terminal Gain vs. Ta
Ver.2004-02-17
Input DC Level vs. Ta
SAG Terminal Voltage vs. Ta
Voltage Gain vs. Ta (Clamp Type Input)
-5-
NJM2268
■ TYPICAL CHARACTERISTICS
Voltage Gain vs. Ta (Bias Type Input)
Gain Frequency Characteristics
vs. Ta (Bias Type Input)
Differential Phase vs. Ta
-6-
Gain Frequency Characteristics
vs. Ta (Clamp Type Input)
Differential Gain vs. Ta
Operating Current vs. Operating Voltage
Ver.2004-02-17
NJM2268
■ TYPICAL CHARACTERISTICS
Input DC Level vs. Operating Voltage
SAG Terminal Voltage vs. Operating Voltage
Voltage Gain vs. Operating Voltage
(Clamp Type Input)
Ver.2004-02-17
Output DC Level vs. Operating Voltage
SAG Terminal Gain vs. Operating Voltage
Voltage Gain vs. Operating Voltage
(Bias Type Input)
-7-
NJM2268
■ TYPICAL CHARACTERISTICS
Gain Frequency Characteristics
vs. Operating Voltage (Clamp Type Input)
Differential Gain vs. Operating Voltage
Voltage Gain vs. Frequency (Clamp Type Input)
-8-
Gain Frequency Characteristics
vs. Operating Voltage (Bias Type Input)
Differential Phase vs. Operating Voltage
Voltage Gain vs. Frequency (Bias Type Input)
Ver.2004-02-17
NJM2268
■ TYPICAL CHARACTERISTICS
Small Signal Voltage Gain
vs. Frequency (Clamp Type Input)
Cross Talk vs. Frequency
Voltage Gain vs. RL (Bias Type Input)
Ver.2004-02-17
Small Signal Voltage Gain
vs. Frequency (Bias Type Input)
Voltage Gain vs. RL (Clamp Type Input)
Gain Frequency Characteristics
vs. RL (Clamp Type Input)
-9-
NJM2268
■ TYPICAL CHARACTERISTICS
Gain Frequency Characteristics
vs. RL (Bias Type Input)
Differential Gain vs. RL
Differential Phase vs. RL
Differential Gain vs. APL
Differential Phase vs. APL
- 10 -
Ver.2004-02-17
NJM2268
■ APPLICATION
This IC requires 1MΩ resistance between INPUT and GND pin for clamp type input since the minute current
causes an unstable pin voltage.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2004-02-17
- 11 -