The LM1884 is a TV stereo decoder designed by National Semiconductor. It provides low‑impedance left‑right (L‑R) and left‑mono (L‑R) outputs, mono/stereo switching, and low distortion (0.10% typical). Typical applications include stereo television sets, stereo adapters, and cable television.
The document lists absolute maximum ratings, detailed electrical characteristics, and a typical application circuit. Key parameters such as supply current, output voltage levels, output impedance, lamp drive specifications, and pilot levels are provided, along with a block diagram and reference design information.
| Output Voltage Pin 4 | 1.7 V – 5.0 V (typical 3.5 V) |
|---|---|
| Output Voltage Pin 5 | 1.7 V – 5.0 V (typical 3.5 V) |
| Output Impedance (Pins 4,5) | 100 Ω – 300 Ω |
| Input Impedance (Pin 1) | 15 kΩ – 150 kΩ (typical 50 kΩ) |
| Pilot Level for Lamp On | 12 mV – 20 mV |
| Pilot Level for Lamp Off | 3 mV – 10 mV |
| Capture Range Pilot | 25 mVrms ± 0.5 % |
Both pins 4 and 5 have output voltages ranging from 1.7 V to 5.0 V, with a typical value of about 3.5 V.