The BUF01900/1901 is a programmable voltage output product with 10-bit resolution. Programming of the output occurs through an industry-standard, two-wire serial interface. Once the correct VCOM voltage is established it can easily be stored into the integrated nonvolatile memory. An initial output voltage and adjustment range can be set by an external resistor-divider. With its large output current capability (up to 100mA), the BUF01900 and BUF01901 are ideally suited as programmable VCOM calibrators in LCD panels. The BUF01901 has the digital-to-analog converter (DAC) output brought out directly. It has a slightly lower cost than the BUF01900, and works very well with the integrated VCOM in traditional LCD panels.
The BUF01900 and BUF01901 are 10‑bit programmable voltage sources with an industry‑standard two‑wire serial interface and on‑chip non‑volatile memory. The BUF01900 includes an integrated buffer capable of delivering up to 100 mA, while the BUF01901 is a lower‑cost version intended for use with an external Vcom buffer.
Both devices operate from a 7 V to 18 V analog supply and a 2.0 V to 5.5 V digital supply, and are specified for temperatures from –40 °C to +85 °C. They are offered in TSSOP‑8 and DFN‑10 packages and feature high ESD protection (2 kV HBM, 500 V CDM).
| Resolution | 10‑bit |
|---|---|
| Output current capability | up to 100 mA |
| Analog supply voltage | 7 V to 18 V |
| Digital supply voltage | 2.0 V to 5.5 V |
| Operating temperature range | -40 °C to +85 °C |
| ESD rating (HBM) | 2 kV |
| ESD rating (CDM) | 500 V |
| OTP write cycles | 4 total cycles |
The BUF01900 can source up to 100 mA of output current.
The analog supply voltage must be between 7 V and 18 V, and the digital supply between 2.0 V and 5.5 V.
The OTP memory can be written four times (one initial write plus three overwrites).
The devices are specified for operation from –40 °C to +85 °C.