1246

NTE1246
Integrated Circuit
TV Sound IF, Audio Output, 2.4W
Description:
The NTE1246 is a silicon monolithic integrated circuit designed for SIF and audio sections in TV receivers. It includes a sound IF amplifier, FM detector, DC volume output control circuit, audio output
amplifier (2.4W output power) and a voltage regulator.
Features:
D Reduced Number of External Components
D DC Controlled, so Sheilded wire not Required, Variable Resistor may be Placed Anywhere
D Electronic Attenuation: 80dB typ.
D Peak Differential FM Detection Method, Amplifies Circuitry and Adjustment
D Wide Operating Voltage Range: 9V to 18V
Note 1. PC Board Copper Area 50 x 50mm2
Absolute Maximum Ratings: (TA = +25°C, unless otherwise specified)
Supply Voltage (Pin 10), V10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Supply Current (Pin 10), I10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Supply Current (Pin 5), I5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Input Voltage, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Vp−p
Power Dissipation (TA = +75°C), PD1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8W
Power Dissipation (Note 1), PD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4W
Operating Temperature Range, Topg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +150°C
IF Stage:(VCC = 12V, Fo = 4.5MHz, RB = 100Ω, Rg = 50Ω, V14 ≥ 1.3V, fM = 400Hz, f = ±25kHz,
TA = +25°C, unless otherwise specified)
Parameter
Pin 5 Voltage
Symbol
Test Conditions
V5A
Min
Typ Max
Unit
7.5
8.0
8.5
V
V5B
VCC = 18V. RB = 330Ω
7.5
8.0
8.5
V
I10A
No Input Signal
14
19
24
mA
I10B
VCC = 18V, RB = 330Ω, No Input Signal
16
28
35
mA
IF Limiting Voltage
Vi(lim)
VOAF (Vi = 10mVrms) −3dB
−
200
400 µVrms
Detector Output Voltage
VOAF
Vi = 10mVrms
300
360
−
mVrms
Detector Distortion
THD1
−
0.7
−
%
AM Rejection
AMR
AM MOD: 30%, fM = 400Hz, Vi = 10mVrms
−40
−50
−
dB
V14 = 0V
−60
−80
−
dB
Pin 10 Current
Max. Attenuation
ATTmax
Sound Power Stage:(VCC = 12V, f = 400Hz, RB = 100Ω, Rg = 600Ω, RL = 8Ω, TA = +25°C unless
otherwise specified)
Parameter
Symbol
Sound Stage Voltage Gain
GVAF
Sound Output Power
Sound Output Distortion
Overall Sound
Output Distortion
Test Conditions
Min
Typ Max
Unit
Vi = 30mVrms
33
37
41
dB
POA
THD = 10%
0.9
1.2
−
W
POB
VCC = 18V, RB = 330Ω, THD = 10%
2.0
2.4
−
W
THD2A
PO = 0.5W
−
0.6
2.0
%
THD2B
VCC = 18V, RB = 330Ω, PO = 0.5W
−
0.5
2.0
%
THD3
PO = 0.5W, Vi = 10mVrms
−
1.5
4.0
%
fo = 4.5MHz
Pi IImpedance
Pin
d
5.5MHz
6.0MHz
6.5MHz
U it
Unit
R
C
R
C
R
C
R
C
Pin 12 IF Input
2
9.5
2
9.4
1.9
9.4
1.9
9.4
kΩ/pF
Pin 1 Detector Connect
2.4
6.3
2.4
6.2
2.4
6.1
2.4
6.1
kΩ/pF
Pin 2 Detector Connect
11.5
9
9
8.5
8.5
8.3
7.8
8.1
kΩ/pF
Pin Connection Diagram
FM Detector
1
14 Volume Control
FM Detector
2
13 SIF Input Cold
De−Emphasis
3
12 SIF Input Hot
SIF Detector Output
4
11 Feedback
SIF Supply Voltage
5
10 VCC
Decouple
6
9
Bootstrap
Input
7
8
Output
.164 (4.2)
.252 (6.4)
14
8
1
7
2.00
(5.08)
Max
.300
(7.62)
.764 (19.4) Max
.100 (2.54)
.020
(.508)
.100 (2.54)