LM1246 is a 150MHz I2C compatible RGB preamplifier with internal 512 character OSD ROM, 512 character RAM and 4 DACs
The LM1246 pre‑amp is an integrated CMOS CRT preamplifier with an I²C‑compatible interface that allows full control of gain, contrast, brightness and bias. It features a 24‑lead DIP package, internal 512‑character OSD ROM and RAM, and four 8‑bit DAC outputs for video bias and brightness control.
Key features include programmable vertical and horizontal blanking, a spot‑killer circuit, power‑saving mode that reduces consumption by 65 %, and built‑in ESD protection rated at 3 kV. The device is compatible with LM246x driver families and is intended for low‑end bus‑controlled monitors and 1024×768 displays requiring OSD capability.
| Maximum operating frequency | 150 MHz |
|---|---|
| Package type | 24‑lead DIP molded plastic |
| OSD ROM size | 512 characters |
| OSD RAM size | 512 characters |
| Number of DAC outputs | 4 (8‑bit) |
| Power‑saving reduction | 65 % reduction |
| ESD protection level | 3.0 kV |
It provides four 8‑bit DAC outputs.
The device includes 3.0 kV ESD protection.
It is packaged in a 24‑lead DIP molded plastic package.