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The LM1894 is a stereo noise reduction circuit for use with audio playback systems. The DNR system is non-complementary, meaning it does not require encoded source material. The system is compatible with virtually all prerecorded tapes and FM broadcasts. Psychoacoustic masking and an adaptive bandwidth scheme allow the DNR to achieve 10 dB of noise reduction. DNR can save circuit board space and cost because of the few additional components required.
LM1894 Pinout
LM1894 Pin Configuration
| Pin No | Description |
|---|---|
| 1 | Positive Supply Voltage |
| 2 | Channel 1 Input Pin |
| 3 | Channel 1 Input/Output Pin |
| 4 | Channel 1 Output Pin |
| 5 | Amplifier Output Pin |
| 6 | Amplifier Gain Pin |
| 7 | Ground Pin |
| 8 | Gain Amplifier Output Pin |
| 9 | Peak Detector Input Pin |
| 10 | Peak Detector Output Pin |
| 11 | Channel 2 Output Pin |
| 12 | Channel 2 Input/Output Pin |
| 13 | Channel 2 Input Pin |
| 14 | Bypass Pin |
LM1894N Features
- Non-complementary noise reduction, “single ended”
- Low cost external components, no critical matching
- Compatible with all prerecorded tapes and FM
- 10 dB effective tape noise reduction CCIR/ARM weighted
- Wide supply range, 4.5V to 18V
- 1 Vrms input overload
Application
- Automotive radio/tape players
- Compact portable tape players
- Quality HI-FI tape systems
- VCR playback noise reduction
- Video disc playback noise reduction
You can download this datasheet for LM1894N DNR Noise Reduction – Datasheet from the link given below:
