NE649 - Signetics

NE649 Low Voltage Dolby Noise Reduction Circuit

The NE649 is an audio noise reduction circuit designed for use in low voltage entertainment systems. The circuit is used to reduce the level of background noise introduced during the recording and playback of audio signals on magnetic tape and improve the noise level in FM broadcast reception. The circuit is intended for use in automotive and portable casse.

Features

d soldering temperature 10sec max RATING 16 -40 to +85 -65 to + 150 +300 UNIT V °C °C °C BLOCK DIAGRAM 16 October 7, 1987 INPUT AMP 185 853-1193 90826 Low Voltage Dolby
· Noise Reduction Circuit Product Specification NE649 DC ELECTRICAL CHARACTERISTICS Vee = 9V, f = 20Hz to 20kHz. All levels referenced to 580mVRMS (OdB) at Pin 3, TA = + 25°C, unless otherwise specified. SYMBOL PARAMETER Vcc Supply voltage range3 Minimum voltage supply for 8dB headroom 10dB headroom Icc Supply Current Icc Supply Current1 Av Voltage gain (Pins 5 - 3) TEST CONDITIONS f = 1.4kHz THO < 1% f = 1.