NTE NTE1728 Datasheet
NTE1728
Integrated Circuit
VIF & SIF Circuit for VCR
Description:
The NTE1728 is an integrated circuit in a 30–Lead 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 high–grade
type according to the designer’s policy.
Features:
D High–Gain VIF Amp Requiring No Preamp
D High AGC Speed
D Provides Wide–Band 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 Noise–Canceller, RF AGC, AFT, SIF DET
D SIF Section: SIF Limiter Amp, FM Det, DC ATT, AF Driver
Operating Characteristics: (TA = +25°C, VCC = 12V, fp = 58.75MHz, fs = 54.25MHz (VIF),
fo = 4.5MHz (SIF) unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
VIH Section
Total Circuit Current I23 + I24DC 59 74 98 mA
Maximum RF AGC Voltage VH
Minimum RF AGC Voltage V
Quiescent Video Output Voltage V
Quiescent AFT Output V
Input Sensitivity V
AGC Range GR fm = 15kHz 78% AM, VO = ±1dB 60 74 – dB
DC 8.5 8.9 9.2 V
13H
DC – 0 0.5 V
13L
DC 5.6 6.1 6.6 V
22
DC 4.5 6.5 7.5 V
17
fm = 400Hz 40% AM, VO = 0.8V
i
pp
30 36 42 dBµ
Operating Characteristics (Cont’d): (TA = +25°C, VCC = 12V, fp = 58.75MHz, fs = 54.25MHz
(VIF), fo = 4.5MHz (SIF) unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
VIH Section (Cont’d)
Maximum Allowable Input V
Video Output Amplitude V
imaxfm
O(22)Vi
= 15kHz 78% AM, VO = ± 1dB
= 10mV
Output S/N S/N Vi = 10mV
Carrier Leakage CL Vi = 100mV
Maximum AFT Voltage V
Minimum AFT Voltage V
17H
17L
Vi = 10mV
Vi = 10mV
AFT Detection Sensitivity Sf Vi = 10mV
White Noise Threshold Level V
Black Noise Threshold Level V
Black Noise Clamp Level V
SIF Output Signal Voltage V
Frequency Characteristic f
WTH
BTH
BCL
O(25)
Vi = 10mV
Vi = 10mV
Vi = 10mV
P/S = 20dB 40 60 100 mV
–3dB 6 8 – MHz
o
Differential Gain DG Vi = 10mV
Differential Phase DP Vi + 10mV
Input Resistance R
Input Capacitance C
i
i
Vi = 10mV
SIF Section
, fm = 15kHz 78% AM 1.9 2.2 2.5 V
rms
, CW 48 54 – dB
rms
, fm = 15kHz 78% AM 50 57 – dB
rms
, SWEEP 11.0 11.5 12.0 V
rms
, SWEEP 0 0.4 1.0 V
rms
, SWEEP 70 100 140 mV/kHz
rms
, SWEEP 6.4 6.8 7.2 V
rms
, SWEEP 1.9 2.2 2.5 V
rms
, SWEEP 3.8 4.2 4.6 V
rms
87.5, VIDEOMOD – 4 10 %
rms
87.5%, VIDEOMOD – 3 6 deg
rms
87.5,%, VIDEOMOD 1.0 1.5 2.0 kΩ
rms
– 3.5 7.0 pF
pp
rms
SIF Limiting Voltage V
Detection Output Voltage V
O(2)
–3dB – 200 400 µV
ilim
Vi = 100mV
Distortion THD(2) Vi = 100mV
AM Rejection AMR Vi = 100mV
30%
DCVR Maximum Attenuation ATT Vi = 200mV
AF Amp Gain G
AF Amp Output Voltage V
O(5)
AF
Vi = 100mV
V
THD = 10%, f = 400Hz 3 4 – V
O(5)
, fm = 400Hz, f = ±25kHz 450 680 850 mV
rms
, fm = 400Hz, f = ±25kHz – 0.5 1.0 %
rms
, fm = 400Hz, f = ±25kHz
rms
, f = 400Hz 70 80 – dB
rms
, f = 400Hz 18 20 22 dB
rms
50 60 – dB
rms
rms
rms
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