DATASHEET To request the full datasheet, please visit www.intersil.com/products/isl24837a ISL24837A Features The ISL24837A contains a programmable 10-bit, 8-channel gamma DAC generator, a programmable 10-bit, 4-channel level shifter reference generator with external gain control, a trimmed bandgap voltage reference, and a digitally-controlled VCOM calibrator. The reference voltage of ISL24837A is set by the bandgap and two external feedback resistors, so the output voltages are independent of AVDD. The VCOM calibrator is the sink-current output that attaches to an external voltage divider. The desired VCOM setting is controlled by the I2C interface. Two banks of channels with external pin or I2C control enable fast switching between 2 different gamma curves stored in internal EEPROM. • 8 Programmable 10-bit Gamma Voltages with Bandgap-Trimmed Reference The ISL24837A is available in a 32 Ld QFN package and is specified for operation over the -40°C to +85°C temperature range. Related Literature*(see page 17) • See FN6842,“8-Channel Programmable I2C TFT-LCD Reference Voltage Generator with Band Gap Trimmed Reference, 4-Channel Programmable Amps with Negative Feedback Inputs, 1-Channel VCOM Op Amp, Integrated VCOM Calibrator and 2 Banks of Integrated EEPROM” • 4-Channel, 10-bit Programmable Amps with Feedback Inputs for Level Shifter Reference Voltages • Integrated Programmable VCOM Calibrator • 1 VCOM Op Amp • 2 Banks of EEPROM Storage, Rewriteable >300 Times • 10-bit Resolution on all DACs • 20ms DAC Loading Time at Power-On • Analog Supply: 12V to 18V @ 15mA (Unloaded) • Digital Supply: 2.5V to 3.3V @ 1mA (Unloaded) • I2C Interface • Pb-free (RoHS Compliant) Applications*(see page 17) • TFT-LCD Column Driver Reference Generator • General-Purpose Reference Voltage Generators GAMMA …….. …….. TFT-LCD PANEL TIMING CONTROL (TCON) COLUMN DRIVERS TFT-LCD SCREEN ISL24837A GAMMA BUFFER (COLUMN DRIVER DAC REFERENCE VOLTAGES) VCOM CALIBRATOR VCOM DRIVER DATA LINE GATE DRIVERS SELECT LINE STORAGE CAPACITOR LC PIXEL TFT COMMON (VCOM) FIGURE 1. TYPICAL APPLICATION August 25, 2010 FN7645.1 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. I2C Bus™ is a trademark owned by NXP Semiconductors Netherlands, B.V. Copyright © Intersil Americas Inc. 2010. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL24837A Programmable TFT-LCD VREF Generator ISL24837A For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 2 FN7645.1 August 25, 2010