AEC-Q100 analogue switch enhances signal integrity

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 C_ON of 26pF and C_OFF 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.