NTE NTE826 Datasheet
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
Input Current (Pin6), I
Input Signal Voltage (Between Pin12 and Pin13) 3V
Operating Temperature Range, T
Storage Temperature Range, T
Maximum Junction Temperature, T
Lead Temperature (During Soldering, 10sec), T
MAX
CC
stg
opr
50mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J
L
+150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+300°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics:
Parameter Test Conditions Min Typ Max Unit
Power Output VCC = 24V, RL = 16Ω, THD = 10% – 1.3 – W
VCC = 16V, RL = 8Ω, THD = 10% – 2.6 – W
VCC = 14V, RL = 8Ω, THD = 10% – 1.9 – W
VCC = 12V, RL = 8Ω, THD = 10% – 1.3 – W
26V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
p–p
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 = 0Ω – – 15 mV
Current into Pin6 Voltage at Pin6 = 10V 7.0 10.8 15.0 mA
AM Rejection VIN = 1 to 100mV
, ∆f = 25kHz, AM = 30% 40 – – dB
rms
Recovered Audio (Pin8) 350 500 – mV
Input Limiting Voltage (Pin16 to Pin1) 40 – 60 V/V
Output Noise, Input Signal Removed (Pin1) Resistance at Pin7 = 10Ω – 70 150 mV
Distortion (Pin8) ∆f = 25kHz, fo = 4.5MHz – 1.2 2.0 %
Input Impedance (Pin16) 50 200 – kΩ
Current into Pin2 (Zero Audio Output
V2 = 24V 2 5 20 mA
at Pin1)
Pin Connection Diagram
Power Amp Output
Power Amp V+
Ripple Bypass
Heat Sink
1
2
3
4
5Heat Sink
6IF V+
7Volume Control
8Detector Output
18
Power Audio GND
17
Low Level Audio GND
16
Power Amp Input
15
Heat Sink
14 Heat Sink
13 IF Input
IF In Decpl
12
IF GND
11
Detector Input9IF Output 10
rms
rms
rms
18 10
19
.870 (22.1) Max
.250
(6.35)
.150
(3.8)
.100 (2.54) .125 (3.17) Min
.800 (20.3)
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