The MAX4818/MAX4819 high-bandwidth, low-on-resistance
analog dual SPDT switches/4:1 multiplexers are
designed to serve as integrated T1/E1 protection
switches for 1+1 and N+1 line-card redundancy applications.
Each MAX4818/MAX4819 replaces four
electromechanical relays, significantly reducing board
space, simplifying PC board routing, and reducing
power consumption. These devices operate with ±3.3V
or ±5V dual supplies for applications requiring T1/E1
signal switching in the line side of the interface transformer.
Internal voltage multipliers drive the analog switches, yielding excellent linearity and low 4Ω typical on-resistance within the T1/E1 analog signal range. This high-bandwidth family of products is optimized for low return loss and matched pulse template performance in
T1/E1 long-haul and short-haul applications.
The MAX4818/MAX4819 are available in a tiny 16-pin,
5mm x 5mm, thin QFN package and are specified over
the extended -40°C to +85°C temperature range.
Key Features
Applications/Uses
Dual SPDT and 4:1 Multiplexer Configurations
Dual-Supply Operation from ±3.3V to ±5V
Single-Supply Operation from +6V to +11V
Hot-Insertion Tolerant with No DC Path to the Supplies
Low On-Resistance, RON = 4Ω (typ) and 6Ω (max)
Over 350MHz -3dB Signal Bandwidth (MAX4818)
Excellent Crosstalk and Off-Isolation Performance Over the T1/E1 Signal Spectrum: Over 110dB Crosstalk Attenuation at 1MHz (MAX4818)
Low Current Consumption of 2mA (max)
-40°C to +85°C Extended Temperature Range
Space-Saving, 16-Pin, 5mm x 5mm Thin QFN
SET Controls All Switches Simultaneously For Redundancy Switching (MAX4819)
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