NTE826
Integrated Circuit
TV Sound System, 2W
Description:
The NTE826 2W sound IF circuit is designed for television and related applications. The circuit is
comprised of 2 independent functions: a sound IF and an audio power amplifier. The sound IF portion
of the circuit utilizes circuitry similar to the NTE712. An improved volume control circuit is included,
however, so that recovered audio is a linear function of the resistance of the control potentiometer.
Audio power amplification is accomplished with circuitry similar to the popular NTE740A audio power
amplifier, featuring both short circuit and thermal protection.
Features:
D
Minimum Undistorted Output: 2W
D
Linear Volume Control: 75dB range
D
Fixed Voltage Gain in Audio Amplifier
D
Short Circuit and Thermal Protection
Absolute Maximum Ratings:
Supply Voltage (Pin2), V
CC
26V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Current (Pin6), I
MAX
50mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Signal Voltage (Between Pin12 and Pin13)
3V
pp
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Junction Temperature, T
J
+150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10sec), T
L
+300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics:
Parameter
Test Conditions
Min
Typ
Max
Unit
Power Output
V
CC
= 24V, R
L
= 16
, THD = 10%
1.3
W
V
CC
= 16V, R
L
= 8
, THD = 10%
2.6
W
V
CC
= 14V, R
L
= 8
, THD = 10%
1.9
W
V
CC
= 12V, R
L
= 8
, THD = 10%
1.3
W
Electrical Characteristics (Cont'd):
Parameter
Test Conditions
Min
Typ
Max
Unit
Zero Regulating Voltage (Pin6)
10.5
11.5
12.5
V
Feedthrough Signal (Pin1)
Resistance at Pin7 = 0
15
mV
rms
Current into Pin6
Voltage at Pin6 = 10V
7.0
10.8
15.0
mA
AM Rejection
V
IN
= 1 to 100mV
rms
,
f = 25kHz, AM = 30%
40
dB
Recovered Audio (Pin8)
350
500
mV
rms
Input Limiting Voltage (Pin16 to Pin1)
40
60
V/V
Output Noise, Input Signal Removed (Pin1)
Resistance at Pin7 = 10
70
150
mV
rms
Distortion (Pin8)
f = 25kHz, f
o
= 4.5MHz
1.2
2.0
%
Input Impedance (Pin16)
50
200
k
Current into Pin2 (Zero Audio Output
at Pin1)
V
2
= 24V
2
5
20
mA
Pin Connection Diagram
IF In Decpl
IF GND
1
2
3
4
Power Amp Output
Power Amp V+
Ripple Bypass
Heat Sink
5
Heat Sink
6
IF V+
7
Volume Control
8
Detector Output
18
17
16
15
Power Audio GND
Low Level Audio GND
Power Amp Input
Heat Sink
14
Heat Sink
13
IF Input
12
11
Detector Input
9
IF Output
10
1
9
18
10
.870 (22.1) Max
.800 (20.3)
.100 (2.54)
.125 (3.17) Min
.250
(6.35)
.150
(3.8)
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