NTE1859 Integrated Circuit dbx TV Noise Reduction Integrated Circuit Description: The NTE1859 is an integrated circuit designed for the dbx–TV noise reduction decode circuit for multichannel TV sound systems. This device contains a voltage controlled amplifier, a variable de–emphasis circuit with new configuration and RMS detectors with completely integrated active band pass filters, and offers the complete dbx–TV noise reduction decoder only with a few external components. Features: D Integrated Band Pass Filters using Active Filtering Technique and Thin Film Structure with High Capacitance D Variable De–emphasis Circuit with New Circuit Configuration D Minimum Number of External Components D Wide Operation Voltage Range: 4.7V to 16V Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17V Allowable Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 715mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Recommended Operating Voltage: Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V to 15V Electrical Characteristics: (TA = +25°C, VCC = +9V Reference Level: 0dB = –5dBm (436mVrms) unless otherwise specified) Parameter Consumption Current Decode Characteristics Symbol Min Typ Max Unit No Signal 4.0 5.0 6.3 mA Vod–1 Vi = –5dB, f = 300Hz 5.5 7.0 8.5 dB Vod–2 Vi = –15dB, f = 300Hz –14.5 –13.0 –11.5 dB Vod–3 Vi = –30dB, f = 300Hz –44.5 –43.0 –41.5 dB Vod–4 Vi = 0dB, f = 1kHz 1.3 3.3 5.3 dB Vod–5 Vi = –10dB, f = 1kHz –19.4 –17.4 –15.4 dB Vod–6 Vi = –20dB, f = 1kHz –39.6 –37.6 –35.6 dB Vod–7 Vi = 0dB, f = 8kHz –4.3 –1.8 0.7 dB Vod–8 Vi = –10dB, f = 8kHz –30.9 –28.4 –25.9 dB Vod–9 Vi = –20dB, f = 8kHz –45.2 –42.7 –40.2 dB ICC Test Conditions Electrical Characteristics (Cont’d): (TA = +25°C, VCC = +9V Reference Level: 0dB = –5dBm (436mVrms) unless otherwise specified) Parameter VCA Filter Characteristics Vemp. Filter Characteristics Total Harmonic Distortion Ratio Maximum Output Voltage Symbol Test Conditions Min Typ Max Unit Vfp–1 f = 3kHz, Vi = 0dB, refer to 1kHz –5.5 –4.0 –2.5 dB Vfp–2 f = 8kHz, Vi = 0dB, refer to 1kHz –13.0 –11.0 –9.0 dB Vfg–1 f = 5kHz, Vi = 0dB, refer to 8kHz –9.4 –7.4 –5.4 dB Vfg–2 f = 2kHz, Vi = 0dB, refer to 8kHz –32.3 –28.8 –25.3 dB THD f = 1kHz, Vi = –3dB – 0.1 0.3 % Vom–1 f = 300Hz, THD = 1.5% 11.0 12.5 – dB Vom–2 f = 8kHz, THD = 1.5% –2.0 1.0 – dB – –104 –80 dB Output Noise Level Von Timing Current Itime (7.1) 7.5 (7.9) µA VCC/2 4.3 4.5 4.7 V Center Potential A weight Electrical Characteristics: (TA = +25°C, VCC = +9V Reference Level: 0dB = –5dBm (436mVrms) Note 1 unless otherwise specified) Parameter Consumption Current Decoding Characteristics 300Hz, –5dB 300Hz, –15dB 300Hz, –30dB 1kHz, 0dB 1kHz, –10dB 1kHz, –20dB 8kHz, 0dB 8kHz, –10dB 8kHz, –15dB VCA Filter Characteristics 3kHz 8kHz Vemp Filter Characteristics 5kHz 2kHz Total Harmonic Distortion Ratio Maximum Output Voltage 300Hz 8kHz Output Noise Level Middle Point Potential Symbol Switch Condition 3 4 5 – – – ICC 1 OFF 2 – Vod–1 Vod–2 Vod–3 Vod–4 Vod–5 Vod–6 Vod–7 Vod–8 Vod–9 ON ON ON ON ON ON ON ON ON – – – – – – – – – b b b b b b b b b b b b b b b b b b Vfp–1 Vfp–2 ON ON a a a a Vfg–1 Vfg–2 THD ON ON ON b b – Vom–1 Vom–2 Von VCC/2 ON ON OFF OFF – – – – Note 1. It suffices that a or b is inserted into (–). 6 b 7 b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b a a b b b b b b b b b b b b b b b b – b b a – b b a – b b b b b b b b Pin Connection Diagram VE TC 1 16 VE WGT Detector Input 2 15 VE Input REF 3 14 VE INT Time 4 13 VE Output VCA TC 5 12 VCA Input VCA WGT 6 11 VCA FB VCC 2 7 10 VCA Output GND 8 16 9 VCC 1 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)