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CS4245-CQZR Datasheet(PDF) 2 Page - Cirrus Logic |
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CS4245-CQZR Datasheet(HTML) 2 Page - Cirrus Logic |
2 / 57 page 2 DS656F2 CS4245 System Features Direct Interface with 1.8 V to 5 V Logic Levels Optional Asynchronous Serial Port Operation – Each Serial Port Supports Master or Slave Operation Selectable Auxiliary Analog Output – Allows Analog Monitoring of Either the ADC Input Signal after PGA or DAC Output Signal Internal Digital Loopback Power-Down Mode – Available for A/D, D/A, CODEC, Mic Preamplifier +3.3 V to +5 V Analog Power Supply +3.3 V to +5 V Digital Power Supply Supports I²C® and SPITM Control Port Interfaces Pin-Compatible with CS5345 General Description The CS4245 is a highly integrated stereo audio CODEC. The CS4245 performs stereo analog-to-digital (A/D) and digital-to-analog (D/A) conversion of up to 24-bit serial values at sample rates up to 192 kHz. A 6:1 stereo input multiplexer is included for selecting between line-level or microphone-level inputs. The mi- crophone input path includes a +32 dB gain stage and a low-noise bias voltage supply. The PGA is available for line or microphone inputs and provides gain/attenu- ation of ±12 dB in 0.5 dB steps. The output of the PGA is followed by an advanced 5th- order, multi-bit delta sigma modulator and digital filter- ing/decimation. Sampled data is transmitted by the serial audio interface at rates from 4 kHz to 192 kHz in either Slave or Master Mode. The D/A converter is based on a 4th-order multi-bit delta sigma modulator with an ultra-linear low-pass filter and offers a volume control that operates with a 0.5 dB step size. It incorporates selectable soft ramp and zero crossing transition functions to eliminate clicks and pops. Standard 50/15 μs de-emphasis is available for a 44.1 kHz sample rate for compatibility with digital audio programs mastered using the 50/15 μs pre-emphasis technique. Integrated level translators allow easy interfacing be- tween the CS4245 and other devices operating over a wide range of logic levels. The CS4245 is available in a 48-pin LQFP package in both Commercial (-10° to +70° C) and Automotive (-40° to +105° C) grade. The CDB4245 Customer Demon- stration board is also available for device evaluation and implementation suggestions. Please see “Ordering In- formation” on page 57 for complete details. |
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