AEC-Q100-qualified analogue switch improves signal integrity and bandwidth

Designed for -40 to +125 degree C operation, the Vishay Siliconix DGQ2788A is an AEC-Q100 (Grade 1) -qualified dual DPDT / quad SPDT analogue switch, from Vishay Intertechnology.

It has low resistance of 0.37-Ohm at 2.7V and 338MHz bandwidth and is supplied in a compact 2.6 x 1.8 x 0.55mm miniQFN16 package.

It can be used for both analogue and digital signal switching in space-constrained automotive applications, says Vishay Intertechnology and offers flat resistance and parasitic capacitance to improve signal integrity and deliver higher bandwidth.

The DGQ2788A is the first in Vishay’s upcoming automotive series of analogue switches designed to address signal switching requirements in the 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 5.0V industrial designs. It features 10-mOhm resistance flatness compared to 500-mOhm, which results in THD of -100dB. This is a 20dB improvement, says Vishay.

In addition, the DGQ2788A’s parasitic capacitance CON of 26pF and COFF of 14.5pF are 70 per cent lower, resulting in a more than three-fold higher -3dB bandwidth of 338MHz. Competing devices with optimised bandwidth can only operate in a narrow power range of 2.3 to 3.6V, says Vishay. The DGQ2788A’s switch gate controlled design provides an 88 per cent lower switch RC matrix. The device’s wide operating voltage range, low resistance, and high bandwidth also simplify the bill of materials for a design, says Vishay.

With an operating temperature range of -40 to +125 degree C, the DGQ2788A 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 to 5.5V power supply, while its digital inputs have a 1.2V logic threshold to ensure low voltage TTL/CMOS compatibility. The RoHS-compliant device offers break before make switching and power down protection, ESD tolerance ove 2kV (human body model), and latch up current of 300mA per JESD78.

Samples and production quantities of the DGQ2788A are available now, with lead times of eight weeks for large orders.

http://www.vishay.com

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