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.

D/A Features
♦ 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

A/D Features
♦ Multi-bit Delta Sigma Modulator
♦ 104 dB Dynamic Range
♦ -95 dB THD+N
♦ 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
♦ Up to 192 kHz Sampling Rates
♦ Selectable Serial Audio Interface Formats
    – Left-Justified up to 24-bit
    – I²S up to 24-bit
♦ High-Pass Filter or DC Offset Calibration

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