Cirrus Logic CS4245K-CQZ

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 microphone 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/attenuation of ±12 dB in 0.5 dB steps. The output of the PGA is followed by an advanced 5thorder, multi-bit delta sigma modulator and digital filtering/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 between 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.

• Multi-bit Delta Sigma Modulator
• 104 dB Dynamic Range
• -90 dB THD+N
• Up to 192 kHz Sampling Rates
• Single-Ended Analog Architecture
• Volume Control with Soft Ramp – 0.5 dB Step Size – Zero Crossing, Click-Free Transitions
• Popguard Technology – Minimizes the Effects of Output Transients
• Filtered Line-Level Outputs
• Selectable Serial Audio Interface Formats Left-Justified up to 24-bit I²S up to 24-bit – Right-Justified 16-, 18-, 20-, and 24-bit
• Selectable 50/15 μs De-Emphasis
• Control Output for External Muting
• Stereo 6:1 Input Multiplexer
• Programmable Gain Amplifier (PGA) – ± 12 dB Gain, 0.5 dB Step Size Zero Crossing, Click-Free Transitions
• Stereo Microphone Inputs – +32 dB Gain Stage Low-Noise Bias Supply
• Selectable Serial Audio Interface Formats – Left-Justified up to 24-bit – I²S up to 24-bit High-Pass Filter or DC Offset Calibration
• Direct Interface with 1.8 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 to +5 V Analog Power Supply
• +3.3 to +5 V Digital Power Supply
• Supports I²C and SPI Control Port Interfaces
• Pin-Compatible with CS5345