NTE NTE1827 Datasheet
NTE1827
Integrated Circuit
VIF & SIF Circuit for TV/VCR
Description:
The NTE1827 is an IC containing the VIF section and SIF section on a single chip in the 20–Lead DIP
package. The use of the small–sized package serves to make VCR tuner units smaller.
Functions:
D VIF section: VIF AMP, Video Det, Peak IF AGC, B/W Noise Canceller, RF AGC, AFT, Video
Mute.
D SIF section: SIF Limiter Amp, FM Det, SND Mute.
Features:
D High–Gain VIF Amp Requiring No Preamp
D Non–Adjusting can be Attained by using a Ceramic Discriminator because of FM Detection
being Quadrature Detection.
D Possible to Mute Video, Sound for VCR.
D Small–Sized Package.
D Minimum Number of External Parts Required.
D Operates from 9V Supply Voltage
Operating Characteristics:
Parameter Symbol Test Conditions Min Typ Max Unit
Total Circuit Current I
Maximum RF AGC Voltage V
Minimum RF AGC Voltage V
Quiescent Video Output Voltage V
Input Sensitivity V
AGC Range GR fm = 15kHz 78%AM, Vo = ±1dB 60 68 – dB
Maximum Allowable Input Vimax fm =15kHz 78%AM, VO = ±1dB 100 – – mVrms
Video Output Amplitude V
Output S/N S/N Vi = 10mV
Carrier Leakage CL Vi = 100mV
Maximum AFT Voltage V
(TA = +25°C, VCC = 12V, fp = 58.75MHz, fs = 54.25MHz (VIF))
17
IOH
IOL
11
i
o(16)
IIH
fm = 400Hz 40%AM, Vo = 0.8V
Vi = 10mV
AM
Vi = 10mV
, fm = 15kHz 78%AM 1.9 2.2 2.5 V
rms
CW 47 55 – dB
rms
, fm = 15kHz 78%
rms
SWEEP 11 11.5 – V
rms
p–p
44 55 73 mA
8.5 9.0 9.5 V
– – 0.5 V
4.5 6.5 7.0 V
30 36 42 dBu
50 57 – dB
pp
Operating Characteristics (Cont’d): (TA = +25°C, VCC = 12V, fp = 58.75MHz, fs = 54.25MHz (VIF))
Parameter Symbol Test Conditions Min Typ Max Unit
Minimum AFT Voltage V
AFT Detection Sensitivity SF Vi = 10mV
White Noise Threshold Level V
White Noise Clamp Level V
Black Noise Threshold Level V
Black Noise Clamp Level V
SIF Output Signal Voltage V
WTH
WCL
BTH
BCL
OS(16)
Frequency Characteristic f
Differential Gain DG Vi =10mV
Differential Phase DP Vi = 10mV
IIL
Vi = 10mV
Vi = 10mV
Vi = 10mV
Vi = 10mV
Vi = 10mV
SWEEP – 0.4 1.0 V
rms
SWEEP 50 88 – mV/kHz
rms
SWEEP 6.4 6.8 7.2 V
rms
SWEEP 4.2 4.6 5.0 V
rms
SWEEP 1.9 2.2 2.5 V
rms
SWEEP 3.8 4.2 4.6 V
rms
P/S = 20dB 70 130 210 mV
–3dB 5 7 – MHz
c
87.5% VIDEOMOD – – 4 %
rsm
87.5% VIDEOMOD – – 3 deg
rms
rms
Input Resistance ri – 1.5 – kohm
Input Capacitance ci – 3.5 – pF
SIF Limiting Voltage Vilim –3dB – 200 400 µVrms
Detection Output Voltage V
O(3)
Vi = 100mV
, fm = 400Hz,
rms
450 650 850 mV
rms
∆f = ±25kHz
Total Harmonic Distortion THD(3) Vi = 100mV
, fm = 400Hz, ∆f =
rms
– 0.5 1.0 %
±25kHz
AM Rejection AMR V
= 100mV
i
, fm = 400Hz,
rms
50 60 – dB
∆f = ± 25kHz, 30%AM
Pin Connection Diagram
FM Coil or
Ceramic Discriminator
FM Coil or
Ceramic Discriminator
Audio Output
IF AGC Filter
Bypass
RF AGC Output
1
2
3
4
5Bypass
6VIF Input
7VIF Input
8
20
19
18
17
16 Video Output
15 AFT Coil
14
13
9RF AGC VR 12
10 11
Bypass
SIF Input
GND
V
CC
LLD Coil
LLD Coil
AFT Coil
AFT Output
20 11
110
.995 (25.3) Max
.100 (2.54) .125 (3.17) Min .385 (9.8)
.280 (7.12) Max
.300
(7.62)
.280
(7.1)
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