ADD8704ARUZ-REEL

Overview

The ADD8704ARUZ-REEL is a single-supply quad operational amplifier from Analog Devices Inc., optimized for TFT LCD applications. It operates within a supply voltage range of 4.5 V to 16.5 V and functions across a temperature range of –40°C to +85°C. The device features four distinct amplifiers: Channels A and D provide rail-swinging outputs with 15 mA continuous current drive, suitable for gamma references. Channels B and C offer high-current drive capabilities of 35 mA continuous and up to 250 mA peak, designed for VCOM or repair amplifier roles. Key electrical parameters include a typical offset voltage of 15 mV, a slew rate of 6 V/µs, and a unity gain bandwidth of approximately 5.8 MHz.

Feature Summary

• Four integrated amplifiers with specialized output characteristics tailored for LCD panel requirements
• High current drive capability on channels B and C for VCOM generation and capacitive load driving
• Rail-to-rail output swing capability allowing operation close to both supply rails
• Unity gain stability maintained even when driving large capacitive loads

Applications

• TFT LCD monitor panels
• TFT LCD notebook panels
• Gamma correction circuits for column drivers
• VCOM buffer generation in display architectures

Procurement Notes

Verify the specific package suffix against the ordering guide to ensure correct physical dimensions and lead configuration. Confirm that the 'Z' designation indicates Pb-free compliance if required by assembly specifications. Ensure the reel packaging matches the intended automated placement equipment. Cross-reference the manufacturer part number with official datasheets to validate revision history and electrical tolerances before integration into production designs.

Selection Notes

Select this component when designing single-supply systems requiring asymmetric current drive capabilities for LCD gamma strings. Choose Channel A or D for low-current reference buffering near the supply rails. Utilize Channels B and C where higher continuous current is necessary to drive VCOM lines or heavy capacitive loads. Ensure the input common-mode voltage aligns with the specific amplifier's input stage limitations to prevent performance degradation.

Part Context

This device belongs to the ADD8704 family of quad operational amplifiers manufactured by Analog Devices Inc. It serves as a drop-in replacement for the EL5420. The product line is engineered specifically for portable electronics and display technologies, offering a compact solution for generating multiple precise voltage references required by modern thin-film transistor liquid crystal displays.

Replacement Considerations

The ADD8704 is documented as a drop-in replacement for the EL5420. Verify pin compatibility and electrical parameter alignment before substitution.

FAQ

What distinguishes the output drive capabilities of the four amplifiers?

Channels A and D are optimized for rail-swinging with 15 mA continuous current, while Channels B and C provide enhanced 35 mA continuous and 250 mA peak current drive for VCOM applications.

How does the ADD8704 handle capacitive loads?

All four amplifiers are unity gain stable with large capacitive loads, making them suitable for driving the parasitic capacitance inherent in LCD panel column drivers.