NTE1728
Integrated Circuit
VIF & SIF Circuit for VCR
Description:
The NTE1728 is an integrated circuit in a 30Lead DIP type package containing the VIF section and
SIF on a single chip. Since this device is capable of performing video detection and sound detection
independently or simultaneously, it can be applied to various sets from popular type to highgrade
type according to the designer's policy.
Features:
D
HighGain VIF Amp Requiring No Preamp
D
High AGC Speed
D
Provides WideBand Detection Characteristics and Meets Sound MPX Demodulation Requirements
because of FM Detection being Quadrature Detection.
D
Possible to use Sound REC Pin (Pin2), AUX Pin (Pin3)
D
Possible to Mute Video, Sound for VCR
D
Pin7 GND: Muting of both Video and Sound
D
Pin29 GND: Muting of Sound Only
Functions:
D
VIF Section: VIF Amp Video Det, Peak IF AGC, B/W NoiseCanceller, RF AGC, AFT, SIF DET
D
SIF Section: SIF Limiter Amp, FM Det, DC ATT, AF Driver
Operating Characteristics: (T
A
= +25
C, V
CC
= 12V, f
p
= 58.75MHz, f
s
= 54.25MHz (VIF),
f
o
= 4.5MHz (SIF) unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
VIH Section
Total Circuit Current
I
23
+ I
24
DC
59
74
98
mA
Maximum RF AGC Voltage
VH
13H
DC
8.5
8.9
9.2
V
Minimum RF AGC Voltage
V
13L
DC
0
0.5
V
Quiescent Video Output Voltage
V
22
DC
5.6
6.1
6.6
V
Quiescent AFT Output
V
17
DC
4.5
6.5
7.5
V
Input Sensitivity
V
i
f
m
= 400Hz 40% AM, V
O
= 0.8V
pp
30
36
42
dB
AGC Range
GR
f
m
= 15kHz 78% AM, V
O
=
1dB
60
74
dB
Operating Characteristics (Cont'd): (T
A
= +25
C, V
CC
= 12V, f
p
= 58.75MHz, f
s
= 54.25MHz
(VIF), f
o
= 4.5MHz (SIF) unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
VIH Section (Cont'd)
Maximum Allowable Input
V
imax
f
m
= 15kHz 78% AM, V
O
=
1dB
Video Output Amplitude
V
O(22)
V
i
= 10mV
rms
, fm = 15kHz 78% AM
1.9
2.2
2.5
V
pp
Output S/N
S/N
V
i
= 10mV
rms
,
CW
48
54
dB
Carrier Leakage
CL
V
i
= 100mV
rms
, fm = 15kHz 78% AM
50
57
dB
Maximum AFT Voltage
V
17H
V
i
= 10mV
rms
,
SWEEP
11.0
11.5
12.0
V
Minimum AFT Voltage
V
17L
V
i
= 10mV
rms
,
SWEEP
0
0.4
1.0
V
AFT Detection Sensitivity
Sf
V
i
= 10mV
rms
, SWEEP
70
100
140
mV/kHz
White Noise Threshold Level
V
WTH
V
i
= 10mV
rms
, SWEEP
6.4
6.8
7.2
V
Black Noise Threshold Level
V
BTH
V
i
= 10mV
rms
, SWEEP
1.9
2.2
2.5
V
Black Noise Clamp Level
V
BCL
V
i
= 10mV
rms
, SWEEP
3.8
4.2
4.6
V
SIF Output Signal Voltage
V
O(25)
P/S = 20dB
40
60
100
mV
rms
Frequency Characteristic
f
o
3dB
6
8
MHz
Differential Gain
DG
V
i
= 10mV
rms
87.5, VIDEOMOD
4
10
%
Differential Phase
DP
V
i
+ 10mV
rms
87.5%, VIDEOMOD
3
6
deg
Input Resistance
R
i
V
i
= 10mV
rms
87.5,%, VIDEOMOD
1.0
1.5
2.0
k
Input Capacitance
C
i
3.5
7.0
pF
SIF Section
SIF Limiting Voltage
V
ilim
3dB
200
400
V
rms
Detection Output Voltage
V
O(2)
V
i
= 100mV
rms
, f
m
= 400Hz, f =
25kHz
450
680
850
mV
rms
Distortion
THD(2)
V
i
= 100mV
rms
, f
m
= 400Hz, f =
25kHz
0.5
1.0
%
AM Rejection
AMR
V
i
= 100mV
rms
, f
m
= 400Hz, f =
25kHz
30%
50
60
dB
DCVR Maximum Attenuation
ATT
V
i
= 200mV
rms
, f = 400Hz
70
80
dB
AF Amp Gain
G
AF
V
i
= 100mV
rms
, f = 400Hz
18
20
22
dB
AF Amp Output Voltage
V
O(5)
V
O(5)
THD = 10%, f = 400Hz
3
4
V
rms
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