NJM2542
VIF/SIF Demodulator
DESCRIPTION
The NJM2542 is a VIF/SIF demodulator especially designed for TV
and VCR based on the NTSC system.
FM-PLL(Phase Locked Loop) detector reduces the number of pins
and external parts, for efficient use of set space.
FEATURES
•
Operating Voltage 5V
•
Alignment-free Automatic Frequency Tuning
•
Alignment-free FM-PLL Demodulator
•
Intercarrier type
•
Bipolar Technology
•
Package Outline: SSOP20
NJM2542V
PACKAGE OUTLINE
BLOCK DIAGRAM
AGCFLT1
AFTOUT
RFAGC
ADJ
RFAGC
OUT
20
19
18
17
16
15
14
13
12
11
AGC
AFT
IFAMP
SVCO
APC
EQAMP
DET
AFAMP
FMDET
LIM
VCO
1
EQOUT
2
APCFLT
3
EQIN
4
V+
5
VCOL1
6
VCOL2
7
VREF
8
VDETOUT
9
AGCFLT2
10
LIMIN
AFOUT
AFNFB
IFIN2
IFIN1
GND
EQ
-1-
NJM2542
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Supply Voltage
Vcc
Power Dissipation
P
D
Operating Temperature Range
T
opr
Storage Temperature Range
T
stg
* Test IC soldered on PC board
RECOMMENDED OPERATING VOLTAGE RANGE
Parameter
Condition
Operating Voltage
ELECTRICAL CHARACTERISTICS
Standard Test Conditions:
(T
A
=25°C,Vcc=5V,IF=45.75MHz/90dBuV,IF IN has 1:1Transformer instead of SAW filter.)
Parameter
Condition
Symbol
Min.
Typ.
AFT-Defeat
Supply Current
Icc
-
51
IFGR-MAX(AGCFLT=GND)
VIF Section (45.75MHz/90dBuV)
No IF Signal
Video Output Level (DC)
VDC
-
3.6
FGR-MAX(AGCFLT=GND)
Video Output Level
Video : 100% White,87.5% Mod
Vo
1.5
1.9
Video Bandwidth
-3dB Point
fvc
-
7
Video S/N
VIDEO:100% White,87.5%Mod Video S/N
50
56
Intermodulation
P/C/S=1/-10/-10dB
IM
34
40
Differential Gain
DG
-
±2
Differential Phase
DP
-
±2
Input Signal Voltage Sensitivity -3dB Point
VINMIN
-
44
Maximum Input signal Voltage
VS Ratio (>24%,<34%)
VINMAX
101
105
IF Gain Control Range
VINMAX-VINMIN
GR
49
61
RF AGC Maximum Voltage
IFGR-MAX(AGCFLT=GND)
VRAH
4.3
4.9
+
RF AGC Minimum Voltage
IFGR-MIN(AGCFLT= V )
VRAL
0
0.03
Picture Carrier Capture Range 1
CL-U
-
1.3
Picture Carrier Capture Range 2
CL-L
-
3.5
AFT Sensivity
Sf
20
30
AFT Maximum Voltage
VAFH
4.2
4.9
AFT minimum Voltage
VAFL
0
0.05
Sync Level
VOSYNC
-
1.35
AFTOUT=2.5V
VCO Frequency Range
FVCOWB
-
±250
Center=45.65MHz
SIF Section(SIF=4.5MHz/90dBuV)
Audio Output DC Voltage
LIMIN=4.5MHz CW
VDCA
1.8
2.2
Audio Output
LIMIN=4.5MHz FM±25kHz dev
VAFO
390
540
Total Harmonic Distortion
LIMIN=4.5MHz FM±25kHz dev
THDAF
-
0.2
Input Limiting Voltage Sensivity
LIM
-
38
AM Rejection Ratio
FM±25kHzDEV :AM30%
AMR
50
56
Audio S/N
De-Emphasis: ON
AF S/N
-
56
Max.
-
Unit
mA
Symbol
Vcc
Min.
4.75
Typ.
5.0
(T
A
=25°C)
Max.
Unit
5.25
V
(T
A
=25°C)
Unit
V
mW
°C
°C
Ratings
6
*600
-20 to +80
-40 to +150
-
2.3
-
-
50
±7
±7
52
-
-
5.0
0.5
-
-
-
5.0
0.5
-
-
2.6
770
1.0
-
-
-
V
Vp-p
MHz
dB
dB
%
deg
dBuV
dBuV
dB
V
V
MHz
MHz
mV/kHz
V
V
V
kHz
V
mVrms
%
dBuV
dB
dB
-2-
NJM2542
PINNING
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
EQOUT
APCFLT
EQIN
V+
VCOL1
VCOL2
VREF
VDETOUT
AGCFLT2
LIMIN
AFOUT
AFNFB
AGCFLT1
RFAGCOUT
GND
IFIN1
IFIN2
RFAGCADJ
AFTOUT
EQ
Description
Equalizer AMP Output
APC Filter (PLL loop Filter)
Equalizer AMP Input
Power Supply
VCO Coil 1
VCO Coil 2
Reference Voltage for Audio
Video Demodulator Output
AGC Filter 2
Limiter (sound intercarrier) Input
Audio Output
Audio High Pass Filter
AGC Filter 1
RF AGC Output
GND
IF Differential Input 1
IF Differential Input 2
RF AGC Adjustment
AFT Output
Equalizer
-3-
NJM2542
TYPICAL CHARACTERISTICS
Standard Test Conditions:
(T
A
=25°C,Vcc=5V,IF=45.75MHz/90dBuV, IF IN has 1:1Transformer instead of SAW filter.)
VIDEO S/N
60
10
DG
DP
8
50
DG[%] / DP[deg]
VIDEO S/N [dB]
6
VIDEO DG/DP
40
4
30
2
20
-60
-50
-40
-30
-20
-10
0
10
IF Level [dBm ]
VIDEO Chrom a/920K_Beat
50
0
-60
-50
-40
-30
-20
-10
0
10
IF Level [dBm ]
AUDIO S/N / BUZZ
60
Chroma/920K_Beat [dB]
AUDIO S/N / BUZZ [dB]
40
50
40
S/N
BUZZ(SMPTE)
30
30
20
20
10
10
0
-60
-50
-40
-30
-20
-10
0
10
-70
-60
-50
-40
-30
-20
-10
0
IF Level [dBm ]
AF Level
P/S [dB]
THD
3
0
600
500
AF Level [mVrms]
2
400
THD [%]
1
200
0
-80
-60
-40
SIF [dBm ]
-20
0
2
3
4
SIF [MHz]
5
6
7
300
100
-5-
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