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Low dropout regulators eliminate unwanted system noise

Posted: 22 Mar 2016 ?? ?Print Version ?Bookmark and Share

Keywords:Low dropout regulators? LDOs? power rails?

Analog Devices Inc. now offers low dropout regulators (LDOs) that allow cleaner and faster communications in a growing set of noise-sensitive applications. The ADP176x and ADP715x LDOs eliminate unwanted system noise and improve receiver, transmitter, and audio quality, making it ideal for wireless base stations, wired communications, industrial instrumentation, high-end audio equipment, and medical devices.

The new LDOs enable cleaner power rails, faster transient response, and higher power supply rejection ratio (PSRR) in noise-sensitive precision analog and RF applications, particularly when higher data rates are involved.

Higher data rates in many applications are driving the need for cleaner power rails to run sensitive semiconductor devices. The issues intensify as speeds increase and geometries drop from 65nm to 28nm and beyond.

iXL900R

The ADP176x and ADP715x LDOs support a growing set of noise-sensitive applications, including RF transceivers, voltage-controlled oscillators, phase-locked-loop synthesizers, clocks, and high-speed A/D and D/A converters. The new LDOs also reduce PCB size and cost by eliminating the need for additional passive components, including extra external filters and bypass capacitors.

The ADP176x series delivers up to 3A of output current and operates across an output voltage range of 0.5V to 1.5V. This combination of lower voltage output operation addresses the high-current core rail requirements in many emerging applications. The ADP715x series supports an output range of 1.2V to 3.3V and noise performance of 1.6?Vrms from 10Hz to 100kHz while expanding the LDO output current range for this sub-2?Vrms (100Hz to 100kHz) from noise up to 2A maximum. This combination of ultra-low noise and higher PSRR performance set new benchmarks for higher LDO power levels.





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