AEC-Q100 analogue switch enhances signal integrity

30th November 2017
Source: Vishay
Posted By : Mick Elliott

An AEC-Q100 (Grade 1) qualified dual DPDT / quad SPDT analogue switch featuring low resistance of 0.37Ω at 2.7V and 338MHz bandwidth in the compact 2.6mm by 1.8mm by 0.55mm miniQFN16 package has been introduced by Vishay Intertechnology. Ideal for both analogue and digital signal switching in space-constrained automotive applications, the Vishay Siliconix DGQ2788A offers ultra-flat resistance and parasitic capacitance to improve signal integrity and deliver higher bandwidth.

The device the first in an upcoming automotive series of analogue switches designed to address signal switching requirements in the rapidly growing automotive segments of telematics, infotainment, advanced driver assistance systems (ADAS), advanced diagnostics and engine control modules, traction and stability control modules, and power windows, locks, and mirrors.

These applications require audio, video, bus, and communication interface switching to bridge and route signals.

While competing devices with similar resistance can only operate up to 4.3V, the DGQ2788A offers an extended voltage range of 5.5V to accommodate common 5V industrial designs.

It features 10mΩ resistance flatness compared to the competition's 500mΩ, which results in THD of -100dB — a 20dB improvement. In addition, the analogue switch’s parasitic capacitance CON of 26pF and COFF of 14.5pF are 70% lower, resulting in an over 3x higher -3dB bandwidth of 338MHz.

The DGQ2788A's switch gate controlled design provides an 88 % lower switch RC matrix. The device's wide operating voltage range, low resistance, and high bandwidth make it ideal for a variety of design needs, simplifying the BOM.

With an operating temperature range of -40 °C to +125 °C, the device features four independently selectable SPDT switches and two control inputs.

All switches conduct equally well in both directions and can be used as multiplexers and de-multiplexers. The switch operates over a single 1.8 V to 5.5 V power supply, while its digital inputs have a 1.2 V logic threshold to ensure low voltage TTL/CMOS compatibility.

The RoHS-compliant device offers break before make switching and power down protection, ESD tolerance > 2 kV (human body model), and latch up current of 300 mA per JESD78.

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