The DS1866 is a single 8-position Log Trimmer Potentiometer from Texas Instruments with 5-dB/step resolution and operating voltage range of 2.7V to 5.5V. It uses a parallel interface control (P0, P1, P2) and the standard resistance value is 10 kΩ. Its packaging options include 8-pin (300-mil) DIP and 8-pin (150-mil) SOIC.
The DS1866 Log Trimmer Potentiometer is a single volatile digital potentiometer offering eight selectable positions with 5‑dB resolution per step. The wiper position is set via a three‑terminal parallel port (PO, P1, P2), allowing attenuation from 0 dB to –35 dB. It operates from 2.7 V to 5.5 V and is suited for low‑standby‑current portable applications.
Electrical specifications include a 10 kΩ resistance value, supply voltage range of +2.7 V to +5.5 V, operating temperature of –40 °C to +85 °C, and packaging in 8‑pin DIP (300‑mil) or 8‑pin SOIC (150‑mil). Ordering information lists DS1866 (DIP) and DS1866Z (SOIC) versions.
| Standard Resistance Value | 10 kΩ |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V |
| Number of Positions | 8 |
| Attenuation per Step | 5 dB |
| Total Attenuation Range | 0 dB to -35 dB |
| Package Options | 8‑pin DIP (300‑mil) and 8‑pin SOIC (150‑mil) |
| Wiper Resistance | 400‑1000 Ω |
| Input Capacitance | 5 pF |
The wiper position is selected by the three parallel‑port inputs PO, P1 and P2; each binary combination selects one of the eight positions.
The device operates from 2.7 V up to 5.5 V supply voltage.