Features • 8-channel output reference • Accuracy is ±0.1%
• Supply voltage from 4.5V to 16.5V
• Digital Power 3.3V to 5V
• Low supply current of 10mA
• Rail-to-rail capability • I2C control interface

Application • TFT - LCD driver circuit • Reference voltage generator


The EL5126 is designed to produce the required voltage referenced TFT-LCD applications. Each output is programmed to the desired voltage with 10-bit resolution. The reference pin determines high and low over the output voltage range, which is the slew capability to either supply rail. Each output programming is performed using the serial interface. A number of EL5126 stackable applications require more than 8 outputs. Reference inputs can be tied to the rails to enable the full output voltage range of each section, or they can be connected to external resistors to split the output range to enable fine resolution outputs. The EL5126 has 8 outputs and is available in a 32-pin PN package. It is specified for operation over the entire -40°C to +85°C temperature range.

GENERAL DESCRIPTION The EL5126 provides a flexible method for providing reference to the voltages used in transmission to set the characteristics of LCD panels. The required correction for the LCD panel curve using V/t (voltage/transfer) should be applied to make it linear, however, if the panel is used in multiple applications, the final curve may vary for different applications. By using the EL5126, the V/T curve of its characteristics can be changed to optimize the desired application according to the product of the monitor. Eight reference voltage outputs can be set with a 10-bit resolution. These outputs can drive the EL5126 of the guardrail with an internal power of 50mV. Since all output buffers are the same, it is also possible to use the EL5126 for LCD displays where more voltage applications than other references require, and can be set to 10-bit precision.

Digital Interface The EL5126 uses a simple two-wire I2C digital interface, the output of the program. The bus line SCLK is a clock signal line and the data bus SDA is an information signal line. The EL5126 is capable of supporting clock frequencies up to 400kHz. External pull-up resistors are required for each bus line. Typical values for these two pull-up resistors are about 1kΩ.

Start and Stop Conditions The start condition is a high-to-low transition on the SDA line while SCLK is high. The stop condition is a low-to-high transition on the SCLK and SDA lines when the SDA line is high. Start and stop conditions are always generated by the host. The bus is considered a post-start condition and a stop condition for a certain period of time after the busy is freed. Both bus lines should be high when the bus is not used. The I2C timing format shown in Figure 2.