NE646N Dolby Noise Reduction Circuit
The NE646N is a monolithic integrated circuit designed for Dolby B-type noise reduction systems. It is a direct replacement for the earlier NE645B/NE646B devices and is engineered to significantly reduce the background noise typically introduced during the recording and playback of audio on magnetic tape. This circuit also improves the noise level in FM broadcast reception.
Features
- Accurate Record Mode Frequency Response
- Excellent Frequency Response Tracking
- Excellent Back-to-Back Dynamic Response
- Improved Op-Amp Stability
- High Reliability Packaging
Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range (Vcc) | 8 to 20 | V |
| Typical Supply Current (Vcc = 12V) | 16 (Typ) | mA |
| Operating Ambient Temperature | 0 to +70 | °C |
| Voltage Gain (Pins 5-3, f=1kHz) | 26 (Typ) | dB |
| Total Harmonic Distortion (THD) | 0.05 (Typ) | % |
| Signal-to-Noise Ratio (Record Mode) | 72 (Typ) | dB |
| Signal-to-Noise Ratio (Playback Mode) | 82 (Typ) | dB |
| Input Resistance (Pin 5) | 50 (Typ) | kΩ |
| Output Resistance (Pin 3) | 80 (Typ) | Ω |
| Package | 16-Pin Plastic DIP |
Applications
- Tape Decks
- Dolby Surround Sound Systems
- FM Broadcast Reception
- Professional Audio Recording Equipment
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