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)