MAX4749EUD+

Switch Time (Ton, Toff) (Max):	85ns, 45ns
Base Part Number:	MAX4749
Supplier Device Package:	14-TSSOP
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Crosstalk:	-84dB @ 1MHz
Current - Leakage (IS(off)) (Max):	100pA
Channel Capacitance (CS(off), CD(off)):	20pF, 20pF
Charge Injection:	9pC
-3db Bandwidth:	250MHz
Series:	--
Voltage - Supply, Dual (V±):	--
Voltage - Supply, Single (V+):	2 V ~ 11 V
Channel-to-Channel Matching (ΔRon):	100 mOhm
On-State Resistance (Max):	25 Ohm
Number of Circuits:	4
Multiplexer/Demultiplexer Circuit:	1:1
Switch Circuit:	SPST - NO/NC
Part Status:	Active
Packaging:	Tube

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MAX4749EUD+ Application Field and Working Principle

MAX4749EUD+ is a type of analog switch, multiplexer, demultiplexer from Texas Instruments\' portfolio of devices. This device is designed for RF signal routing, attenuation control, and gain control in both AC and DC coupled systems. It is a two-channel device with 2x 8 channels, with each channel having an independent 0.5Ω/2kΩ switchable source-follower termination.

Key Features

The key features of the MAX4749EUD+ are as follows:• Two 4x2 matrices a 4x1 multiplexer, and a 2x1 multiplexer, each with independent 0.5Ω/2kΩ switchable source-follower termination.• A 2x1 differential multiplexer.• Passband frequency range up to 2GHz.• Low insertion loss of 0.05dB at 1GHz.• Low crosstalk of –45dB at 1GHz.• High isolation of –65dB at 1GHz.• Input ports provide both DC and AC-coupled signals.• Monotonic control of attenuation and gain (up to 10dB).• Easy-to-use BCD encoding.• Power consumption of only 28mW/channel.• Lead-free 38-LP package.

Applications

The MAX4749EUD+ is well suited for a number of applications, including:• Automotive infotainment and audio processing.• Test and measurement equipment.• Broadcast audio and video.• Cellular base stations.• Military and aerospace systems.• Semiconductor test and assembly equipment.

Working Principle

The MAX4749EUD+ contains a two-channel switch matrix with two 8-channel matrices, a 4-channel multiplexer, and a 2-channel multiplexer. The four output ports allow DC and AC signals to pass through the switch matrix. The output signals are filtered to reduce noise and distortion.The device provides on-board attenuation and gain control. Attenuation is provided by the two 2x1 multiplexers to reduce the signal level. The gain is controlled using BCD encoding, making it easy to set up the gain.The device also features a differential multiplexer which switches the output signals between two input ports. This allows further control over the signal, and can be used to switch between multiple signal sources.The MAX4749EUD+ is a highly integrated device, which makes it an ideal choice for RF signal routing, gain control, and attenuation control in AC and DC coupled systems.

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