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| NTE2004 Integrated Circuit [ Noise Reduction Circuit Dolby Description: The NTE2004 is a monolithic audio noise reduction circuit in a 16-Lead DIP type package designed for use in Dolby B-Type noise reduction systems. This device is used to reduce the level of background noise introduced during recording and playback of audio signals on magnetic tape and to improve the noise level in FM broadcast reception. Features: D Accurate Record Mode Frequency Response D Excellent Frequency Response Tracking with Temperature and VCC 0.4dB Typ D Excellent Back-to-Back Dynamic Response - DC Shift Less Than 20mV Typ D Improved Stability of all OP Amps D High Reliability Packaging Absolute Maximum Ratings: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 60sec max), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C Electrical Characteristics: (TA = +25C, VCC = 12V, f = 20Hz to 20kHz. All levels referenced to 580mVrms(0dB) unless otherwised specified) Parameter Supply Voltage Range Supply Current Voltage Gain (Pin5-3) (Pin3-7) Total Harmonic Distortion 2nd Harmonic 3rd Harmonic Signal Handling Signal-to-Noise Ratio Record Mode Playback Mode VCC = 12V f = 1kHz, Pin6 and Pin2 Connected f = 1kHz, 0dB at Pin3, Noise Reduction Out f = 20Hz to 10kHz, 0dB f = 20Hz to 10kHz, +10dB VCC = 12V, 1% Distortion at 1kHz Note 1 Test Conditions Min 8 - 24.5 -0.5 - - +12 64 74 Typ - 16 26.0 0 0.05 0.2 +15 72 82 Max Unit 20 24 27.5 +0.5 0.2 0.5 - - - dB % % dB dB dB V mA dB Note 1. All noise levels are measured CCIR/ARM weighted using a 10K source with respect to Dolby level. Electrical Characteristics (Cont'd): (TA = +25C, VCC = 12V, f = 20Hz to 20kHz. All levels referenced to 580mVrms(0dB) unless otherwised specified) Parameter Record Mode Frequency Response (At Pin7) Referenced to Encode Monitor Point (Pin3) Test Conditions f = 1.4kHz 0dB -20dB -30dB f = 5kHz 0dB -20dB -30dB -40dB Back-to-Back Frequency Response Input Resistance Using Typical Record Mode Frequency Response Test Points Pin5 Pin2 Output Resistance Pin6 Pin3 Pin7 Back-to-Back Frequency Response Shift Versus Temperature 0 to +70C Versus Supply Voltage 8V to 20V Min -1.5 Typ 0 Max +1.5 Unit dB dB dB dB dB dB dB dB k k k k k dB dB -17.1 -15.6 -14.1 -24.0 -22.5 -21.0 -1.2 +0.3 +1.8 -18.3 -16.8 -15.3 -23.3 -21.8 -20.3 -30.2 -29.7 -28.2 -1.5 35 3.1 1.9 - - - - 0 50 4.2 2.4 80 80 0.4 0.4 +1.5 65 5.3 3.1 120 120 - - 16 Pin Connection Diagram C Input B Input B Output 1 2 3 16 VCC 15 F Control 14 G Output 13 12 D Input 11 C Output 10 D Filter 9 GND .100 (2.54) .700 (17.78) .870 (22.0) Max 1 9 8 Reference 4 A Input A Output S Output 5 6 7 8 .260 (6.6) Max .200 (5.08) Max .099 (2.5) Min |
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