ADD8504WRUZ

Overview

The ADD8504WRUZ is a four-channel LCD gamma reference buffer designed for line inversion panels. It operates on a single supply voltage ranging from 3.3 V to 6.5 V with a typical supply current of 3.8 mA. The device features rail-to-rail input and output capabilities, ensuring compatibility with various logic levels. Key electrical specifications include a maximum offset voltage of 20 mV, a slew rate of 7.0 V/μs, and an output short-circuit current capability up to 380 mA. It is housed in a 16-lead Pb-free TSSOP package and functions reliably within a temperature range of −40°C to +105°C.

Feature Summary

• Features A/B muxed inputs allowing selection between two distinct gamma voltage curves for each channel.
• Provides high output drive capability with a minimum of 120 mA per channel to ensure fast response times.
• Designed for stability with capacitive loads as small as 1 nF without requiring series resistors at the outputs.

Applications

• LCD line inversion gamma references
• Car navigation panels
• Personal media player panels
• Automotive infotainment systems

Procurement Notes

Verify the specific ordering suffix (e.g., REEL7) against the manufacturer's official documentation to confirm packaging type and quantity. Ensure the component meets RoHS compliance requirements if mandated by your design standards. Cross-reference the thermal resistance values provided in the datasheet with your PCB layout constraints to guarantee proper heat dissipation during operation.

Selection Notes

Select this component when designing displays requiring precise gamma correction buffers with high current drive capabilities. The four-channel configuration suits applications needing independent control over multiple column driver inputs. Consider the wide operating temperature range and automotive qualification options if the deployment environment demands extended reliability or specific industry certifications.

Part Context

This part belongs to the ADD850x family of LCD gamma buffers, which also includes five-channel (ADD8505) and six-channel (ADD8506) variants. These devices share similar architectural features but differ in pin counts and channel availability. The ADD8504 specifically utilizes a 16-lead TSSOP package, making it suitable for space-constrained designs compared to its higher-channel counterparts.

Replacement Considerations

The ADD8505WRUZ and ADD8506WRUZ are direct functional equivalents within the same family, offering additional channels. Designers must verify pinout compatibility and software configuration changes required for the extra inputs and outputs before substituting these parts.

FAQ

How does the A/B input selection mechanism function?

Each buffer channel has dedicated INA and INB pins. Applying a Logic High to the A/B select input connects the channel to the INA input, while a Logic Low connects it to the INB input, allowing dynamic switching between two pre-set gamma voltage curves.

Is external series resistance required at the outputs?

No. The outputs are designed to drive both resistive and capacitive loads directly. Using series resistors is discouraged as it may degrade display performance; the buffers are stable with loads as low as 1 nF.