This document describes the features and characteristics of the AD8509/AD8511, a 9-channel and 11-channel multiplexed input LCD reference buffer.
The AD8509 (9‑channel) and AD8511 (11‑channel) are CMOS LCD reference buffers that provide A/B input selection for LCD driver ladders. They operate from a single supply of 3.3 V to 6.5 V, deliver up to 300 mA output current, and maintain stability with capacitive loads up to 1000 pF.
The datasheet lists electrical characteristics such as a 20 mV offset voltage, 50 nA input bias current, and typical supply currents of 8.5 mA (AD8509) and 10 mA (AD8511) at 2.5 V. Pin configurations, functional block diagrams, typical performance curves, and application notes are also provided.
| Supply Voltage Range | 3.3 V – 6.5 V |
|---|---|
| Supply Current (AD8509) | 8.5 mA @ 2.5 V |
| Supply Current (AD8511) | 10 mA @ 2.5 V |
| Output Short‑Circuit Current | 120 mA – 350 mA |
| High Output Current | 300 mA |
| Input Offset Voltage | 20 mV |
| Input Bias Current | 50 nA |
| Slew Rate | 6.2 V/µs |
| Stability with Capacitive Loads | Stable up to 1000 pF |
Both devices operate from a single supply voltage of 3.3 V to 6.5 V.
They can deliver up to 300 mA of output current.
The AD8511 draws about 10 mA at a 2.5 V supply.
Yes, they remain stable with capacitive loads up to 1000 pF.