NTE1801 Integrated Circuit TV dbx Noise Reduction System Description: The NTE1801 Multiplexed Sound dbx Noise Reduction Decoder is a single–chip linear IC in a 28–Lead DIP type package suitable for US NTSC System use. The device incorporates two RMS– level sensors and VCA circuits, as well as five operational amplifiers and two buffer circuits. A complete multiplexed sound system for US NTSC System television sets can be built by interfacing the NTE1801 with the NTE1800 Multiplexed Sound Decoder. Features: D Low Distortion Ratio, Low Interference D Low Power Supply Current D Single, 8V to 15V Power Supply D 100mVrms (300Hz, 0dB) Input Voltage (Pin4) D Easily Interfaced to the NTE1800 Functions: D On–Chip dbx Noise Reduction Decoder and VCA Circuits D On–Chip RMS Level Sensor D L + R Signal Buffer Amplifier Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCCmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Power Dissipation (TA = +75°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 580mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Recommended Operating Conditions: (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 8.0 12.0 13.5 V – 100 – mVrms Power Supply Voltage VCC Input Signal Voltage VIN Amp 1 Gain AV1 0 10.3 30.0 dB Amp 2 Gain AV2 0 – 20 dB f = 300Hz, Pin4 Operating Characteristics: (TA = +25°C, VCC = 12V, 0dB = 100mVrms unless otherwise specified) Parameter Symbol Test Conditions Notes Min Typ Max Unit – 8.0 12.5 17.0 mA Circuit Current ICC No Signal Output Voltage VO1 f = 300Hz, VIN = +10dB (L–R) +17 +20 +23 dB VO2 f = 300Hz, VIN = 0dB (L–R) –3 0 +3 dB VO3 f = 300Hz, VIN = –20dB (L–R) –43 –40 –37 dB VO4 f = 8kHz, VIN = +17dB (L–R) +12.1 +15.1 +18.1 dB VO5 f = 8kHz, VIN = +7dB (L–R) –14.6 –11.6 –8.6 dB VO6 f = 8kHz, VIN = –3dB (L–R) –43.6 –40.6 –37.6 dB VO7 f = 1kHz, VIN = 215mV (L+R) –0.5 0 +0.5 dB Maximum Output Voltage VOM f = 1kHz, THD = 1%, (400 to 300kHz using BPF) (L–R) 4.0 8.6 – VP–P Total Harmonic Distortion THD1 VO = 0dB, f = 1kHz, (400 to 300kHz using BPF) (L–R) – 0.1 0.5 % THD2 VO = 215mV, f = 1kHz, (400 to 300kHz using BPF) (L+R) – 0.1 0.3 % Rg = 0, 400 to 30kHz using BPF (L–R) – –96 –90 dBV (L+R) – –90 –70 dBV – 5.8 6.0 6.2 V Output Noise Voltage NL1 NL2 Reference Voltage Vref VCC = 12V Caution: Static Electricity can impair the performance of this device. Pin Connection Diagram GND 1 28 Reference Voltage Non–Invert Input (Amp 1) 2 27 Capacitor Invert Input (Amp 1) 3 26 Buffer Input Preamp Output 4 25 Buffer Output Buffer Input 5 24 VCA1 Input Buffer Output 6 23 VCA1 Adjust RMS Detector 1 Input 7 22 N.C. Capacitor 8 21 N.C. RMS Detector 2 Input 9 20 Input (Amp 3) Capacitor 10 Resistor Adjust 11 Non–Invert Input (Amp 5) 12 Invert Input (Amp 5) 13 VCC 14 19 Output (Amp 3) 18 VCA2 Input 17 Input (Amp 4) 16 L–R/SAP Output 15 L+R Output 28 15 1 14 1.120 (28.4) .338 (8.6) .200 (5.08) .070 (1.78) .130 (3.3) .400 (10.16)