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), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26V Input Current (Pin6), IMAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Input Signal Voltage (Between Pin12 and Pin13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Vp–p Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Maximum Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Electrical Characteristics: Parameter Power Output Test Conditions Min Typ Max Unit 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 Electrical Characteristics (Cont’d): Parameter Test Conditions Min Zero Regulating Voltage (Pin6) Typ Max 10.5 11.5 12.5 – – 15 Unit V Feedthrough Signal (Pin1) Resistance at Pin7 = 0Ω Current into Pin6 Voltage at Pin6 = 10V 7.0 AM Rejection VIN = 1 to 100mVrms, ∆f = 25kHz, AM = 30% 40 – – dB Recovered Audio (Pin8) 350 500 – mVrms Input Limiting Voltage (Pin16 to Pin1) 40 – 60 V/V 10.8 15.0 mVrms mA Output Noise, Input Signal Removed (Pin1) Resistance at Pin7 = 10Ω – 70 150 mVrms Distortion (Pin8) ∆f = 25kHz, fo = 4.5MHz – 1.2 2.0 % 50 200 – kΩ 2 5 20 mA Input Impedance (Pin16) Current into Pin2 (Zero Audio Output at Pin1) V2 = 24V Pin Connection Diagram Power Amp Output 1 18 Power Audio GND Power Amp V+ 2 Ripple Bypass 3 17 Low Level Audio GND 16 Power Amp Input Heat Sink 4 15 Heat Sink Heat Sink 5 14 Heat Sink IF V+ 6 13 IF Input Volume Control 7 12 IF In Decpl Detector Output 8 11 IF GND IF Output 9 10 Detector Input 18 10 1 9 .870 (22.1) Max .250 (6.35) .150 (3.8) .100 (2.54) .800 (20.3) .125 (3.17) Min