The MAX3845 is a TMDS® 2-to-4 fanout switch and cable driver for multimonitor distribution of DVI™ or HDMI™ signaling up to 1.65Gbps. Both inputs and outputs are standard TMDS signaling as per DVI and HDMI standards. Four DVI/HDMI TMDS outputs are provided for fanout distribution. Each TMDS output can be independently sourced from either input or can be turned off. Each TMDS input or output is composed of four differential channels that can be arbitrarily assigned to the three data signals and the 1/10th-rate clock. The data rate depends on resolution, but it can vary from 250Mbps (VGA) to 1.65Gbps (UXGA or 1080p/60). Typical applications include multiroom display of the same video source or industrial/commercial signage applications such as airport monitors or trading room floor displays. The MAX3845 includes selectable output preemphasis that extends output cable reach up to an additional 7m. For DDC switching, use the companion MAX4814E 2:4 low-resistance CMOS crosspoint switch. DDC switching is not required for applications that connect DDC to one reference monitor only. The MAX3845 can be configured to create a 2 x 8 or 4 x 4 switch (see the Typical Operating Circuit diagrams).
The MAX3845 is a TMDS 2‑to‑4 fanout switch and cable driver designed for multimonitor distribution of DVI or HDMI signals. It provides two TMDS‑compatible inputs and four independently selectable outputs, with optional pre‑emphasis to extend cable reach.
The device operates from –10 °C to +85 °C, uses a 3.0 V–3.6 V supply, and is offered in a 14 mm × 14 mm 100‑pin TQFP‑EP package. Features include selectable output pre‑emphasis (0 dB/3 dB/6 dB), output drive current options (11 mA or 14 mA), and back‑termination options for improved signal integrity.
| Maximum TMDS data rate | 1.65 Gbps |
|---|---|
| Supply voltage (VCC) | 3.0 V to 3.6 V |
| Package | 14 mm × 14 mm, 100‑Pin TQFP‑EP |
| Operating temperature range | -10 °C to +85 °C |
| Pre‑emphasis settings | 0 dB, 3 dB, 6 dB (extends reach up to 7 m) |
| Output drive current | 11 mA (standard) or 14 mA (increased) |
The MAX3845 operates up to 1.65 Gbps.
Select the output pre‑emphasis setting, which can extend cable reach up to 7 m.
It is available in a 14 mm × 14 mm, 100‑pin TQFP‑EP package.
The device requires a VCC of 3.0 V to 3.6 V.