MAX4885

Complete VGA 1:2 or 2:1 Multiplexer


Description

The MAX4885 integrates high-bandwidth analog switches and level translating buffers to implement a complete 1:2 or 2:1 multiplexer for VGA signals. The device provides switching for RGB, display data channel (DDC), and horizontal and vertical synchronization (HSYNC, VSYNC) signals. A low-noise charge pump with internal capacitors provides a boosted gate-drive voltage to improve performance of the RGB switches.

In the 1:2 multiplexer mode, HSYNC/VSYNC inputs feature level-shifting buffers to support low voltage CMOS or standard TTL-compatible graphics controllers. In the 2:1 multiplexer mode, the output buffers for the HSYNC/VSYNC inputs are disabled, allowing bidirectional signaling. In both modes, DDC signals are voltage-clamped to an external voltage to provide level translation and protection. The MAX4885 features a 5µA shutdown mode and is ESD protected to ±8kV human body model (HBM) on externally routed pins.

The MAX4885 is specified over the extended (-40°C to +85°C) temperature range, and is available in the 32-pin, 5mm x 5mm TQFN package.
MAX4885: Typical Operating Circuit MAX4885: Typical Operating Circuit Enlarge+

Key Features

  • +5V Single-Supply Operation
  • Programmable Voltage Clamp for Open-Drain DDC Signals
  • Low 5Ω (typ) On-Resistance (R, G, B Signals)
  • Low 13pF (typ) On-Capacitance (R, G, B Signals)
  • Break-Before-Make Switching Protects Against Circuit Shorts
  • Low 300µA Supply Current (Lower than 1µA with Charge Pump Disabled)
  • Space-Saving, Lead-Free 32-Pin (5mm x 5mm) TQFN Package

Applications/Uses

  • Notebook Computers
  • Servers
Part Number Protocol Functions Config. Channels VSUPPLY (Single)
(V)
VSUPPLY (Single)
(V)
RON
(Ω)
Bandwidth
(MHz)
IL(OFF)
(nA)
tON
(ns)
tOFF
(ns)
QINJECTION
(pC)
CON
(pF)
COFF
(pF)
Budgetary
Price
min max max max min max See Notes
MAX4885  VGA Mux 2-to-1 7 4.5 5.5 10 350 1000 7000 100 10 17 5 $1.53 @1k
See All Switches and Multiplexers (Mid and High Voltage) (312)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX4885EVKIT: Evaluation Kit for the MAX4885

Technical Documents

Reference Schematic 4805 VGA 8:1 Multiplexer Reference Design Using the MAX4885
App Note 4653 FAQs about Analog Switches

Quality and Environmental Data

Product Reliability Reports: MAX4885.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

MAX4885 Macromodel
MAX4885 IBIS Model

 

Related Resources


MAX4968B
16-Channel, Linear, High-Voltage Analog Switches in BGA Packages

  • Save Space—Optimized for High-Channel-Count Systems
  • High Performance—Designed to Enhance Image Quality
  • Increased Flexibility Saves Design Time

MAX4968C
16-Channel, Linear, High-Voltage Analog Switches in BGA Packages

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  • High Performance—Designed to Enhance Image Quality
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