Cirrus Logic Follows Up Success in Low-Power Products with New Analog-to-Digital Converter


"Following exceptional customer acceptance of our recently introduced CS42L51 codec for low-power portable applications, the CS53L21 continues Cirrus Logic's strong momentum of providing high-quality, innovative products for growing portable markets," said Jason Rhode, vice president and general manager, Mixed-Signal Audio Products Division, Cirrus Logic.

Based on an advanced multibit Delta Sigma architecture, the CS53L21 provides two channels of high-quality signal conversion with front-end analog integration to simplify designs and eliminate costly devices from customer designs. An input multiplexer allows for switching between three different stereo analog sources, followed by a programmable gain amplifier with a gain range of +12 dB to 3 dB in 0.5 step sizes. An on-chip dual microphone preamplifier and a programmable low-noise bias supply for external electret microphones is also included. This high level of integration helps to enable smaller product form factors while reducing costs.

The CS53L21 supports independent control of the left and right channel audio, including digital volume control and mixing, automatic level control and the ability to disable the high pass filters for DC measurements.

Operating from a single power supply of either 1.8V or 2.5V, the CS53L21 consumes less than 9 mW of power and supports a direct interface to logic levels from 1.8V to 3.3V. The IC is offered in a small 32-lead QFN package (only 5mm x 5mm) and is specified at 98 dB dynamic range. The combination of performance, integration and low-power consumption make the CS53L21 ideal for battery powered audio recording devices.
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