Buffers integrate amps to shrink display circuitry

Intersil has developed a highly integrated solution to reduce the cost and size of TFT and LCD displays.

Intersil has developed a highly integrated solution to reduce the cost and size of TFT and LCD displays.

The company has launched three new multichannel buffer products that feature integrated common voltage amplifiers.

A single device can replace up to four ICs, reducing manufacturing costs and valuable board space.

The devices integrate eight (EL5224C), 10 (EL5324C) or 12 (EL5424C) gamma voltage buffers with a high-power common-voltage amplifier in a single IC, allowing manufacturers of thin-film transistor or liquid crystal display monitors to reduce component count compared with using separate common-voltage op amps.

In TFT-LCD displays, the gamma buffers are used to buffer reference voltages set up using a resistor string into the column drivers.

These voltages represent the gamma response of the LCD panel.

The common-voltage amplifier is used to buffer a voltage that drives the backplane of the LCD.

The common-voltage amplifier is specified at 100mA output current.

It is designed to drive capacitive loads and features excellent load regulation.

Each gamma buffer has rail-to-rail input and output capability and is specified at 30mA output current per channel.

The EL5224C, EL5324C and EL5424C operate with supplies from 5 to 18V and consume just 6.5, 7.8 and 8.8mA, respectively.

The EL5x24C extends Intersil's offering of current gamma buffers and common-voltage amplifiers.

Existing products include the EL5220C and EL5420C common-voltage amplifiers and the EL5x23C family of four-, eight-, 10- and 12-channel buffers.

The EL5224C is available in both 24-pin heatsink thin-shrink small outline (HTSSOP) and 24-pin leadless plastic (LPP) packages.

The EL5324C is available in 28-pin HTSSOPs and 32-pin LPPs.

All parts are available now in production quantities.

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