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BUF01901AIDRCRG4 Fiches technique(PDF) 7 Page - Texas Instruments |
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BUF01901AIDRCRG4 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 25 page BUF01900 BUF01901 SBOS337A − OCTOBER 2006 − REVISED OCTOBER 2006 www.ti.com 7 APPLICATIONS INFORMATION OVERVIEW The BUF0190x family of products consists of a 10-bit digi- tal-to-analog converter (DAC) that is programmed through an industry-standard two-wire interface. It contains on- chip nonvolatile memory that stores a specific DAC value that is read at power-up. The BUF0190x family consists of two devices: The BUF01900 contains a voltage buffer that is capable of driving high-current; the BUF01901 is a low- er-cost version without the buffer. The BUF0190x is espe- cially well-suited for VCOM calibration in LCD panels; how- ever, it can also be used in many other applications. Figure 14 shows the BUF01900 in a typical configuration. BUF01900: ON-CHIP BUFFER Unlike many programmable VCOM calibrators on the mar- ket, the BUF01900 offers an integrated VCOM buffer with high current output drive capability. The output is capable of delivering peak currents over 100mA to within 4V from the positive supply and to within 2V from the negative sup- ply. Using this option is very cost-effective and convenient in systems that do not use multi-channel gamma buffers with integrated VCOM drive. Figure 15 shows the BUF01900 in a typical configuration. (1) Timing Controller 0.1 µF 0.1 µF V S V SD V COM (2) (2) V S 10 µF 10k Ω 10k Ω + 1 2 3 4 8 7 6 5 SDA SCL A 0 V SD V S V COM V BIAS GND (1) Optional −may be needed for stability. (2) Optional −see application text for component selection. BUF01900 NOTES: Figure 14. Typical Application Diagram BIAS 250k Ω Analog 7V to 18V R 1 R 2 Digital 2V to 5.5V SDA Input Control Logic SCL A0 10−Bit DAC 4x OTP ROM Switch Control Voltage Regulator BUF01900 V COM Buffer V COM Panel Figure 15. BUF01900 Typical Configuration |
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