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| NTE748 Integrated Circuit TV Sound Circuit Description: The NTE748 is an integrated circuit in a 14-Lead DIP type pacjage designed for IF limiting, detection, audio preamplifier and driver for the sound portion of a TV receiver. Features: D Excellent Limiting with 80V(rms) Input Signal typ D Large Output-Voltage Swing-to 3.5V(rms) typ D High IF Voltage Gain-65dB typ D Zener Power-Supply Regulation Built-in D Short-Circuit Protection D A Coincidence Discriminator that Requires Only One RLC Phase Shift Network D Preamplifier to Drive a Single External-Transistor Class-A Audio Output Stage Absolute Maximum Ratings: (TA = +25C unless otherwise specified) Power Supply Voltage, V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16V Input Voltage, Vin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7V(rms) Power Dissipation (Package Limitation), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW Derate above +25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0mW/C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +75C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Electrical Characteristics: (V+ = 12V, TA = +25C, f = 4.5MHz, Deviation = 25kHz unless otherwise specified) Parameter Input Voltage AM Rejection Symbol VL AMR -3dB Limiting Vin = 20mVrms, AM = 30%, AMR = 20 log, Note 1 VOFM: f = 4.5MHz, Deviation = 25kHz, QL = 24 VOAM: f = 5.5MHz, Deviation = 50kHz, QL = 30 Test Conditions Min - - - - - Typ 80 45 45 1.0 3.5 Max 160 - - - - Unit Vrms dB dB % Vrms Total Harmonic Distortion Maximum Undistorted Audio Output Voltage (Pin10) THD QL = 24, 7.5kHz Deviation, Note 1 Vo(max) Audio Gain Adjusted Externally, Q = 24, Note 1 Electrical Characteristics (Cont'd): (V+ = 12V, TA = +25C, f = 4.5MHz, Deviation = 25kHz unless otherwise specified) Parameter Recovered Audio (Pin2) Symbol VA AVP AVIF Rin Cin VReg ID PD IZ = 5mA IZ = 5mA IZ = 5mA Test Conditions f = 4.5MHz, Deviation = 25kHz, QL = 24, Note 1 f = 5.5MHz, Deviation = 50kHz, QL = 30, Note 1 Audio Preamplifier IF Voltage Gain Parallel Input Resistance Parallel Input Capacitance Nominal Zener Voltage Power Supply Current Power Dissipation Open Loop Gain Min Typ Max - - - - - - - - 375 Unit Vrms Vrms dB dB k pF V mA mW 0.35 0.50 - - - - - - - - 0.80 25 65 9.0 6.0 11.6 31 300 Note 1. QL is loaded circuit Q. Pin Connection Diagram Bypass 1 Audio Output 2 Bypass 3 IF Input 4 Bypass 5 Bypass 6 GND 7 14 VCC 13 Quadrature Network 12 Test Point 11 Quadrature Bypass 10 Preamp Output 9 Preamp Input 8 IF Output 14 8 1 7 .785 (19.95) Max .200 (5.08) Max .300 (7.62) .100 (2.45) .600 (15.24) .099 (2.5) Min |
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