CS4234 4 In/5 Out CODEC with Programmable Class H Controller DAC Features System Features 2 Advanced multibit DeltaSigma modulator TDM, left justified, and I S serial inputs and outputs 24-bit resolution Nondelayed low-latency path Differential or single-ended outputs Supports sample rates up to 96 kHz -109 dB dynamic range (A-weighted) Class H Controller Features -90 dB THD+N Can be used with any integrated Class AB amplifier 2 Vrms full-scale output into 3-k AC load IC or discrete amplifier solution. Rail-to-rail operation Increases efficiency of Class AB amplifiers Programmable group delay in 4-channel audio Creates audio tracking reference signal for external output path switch-mode power supply Internal envelope tracking of up to 32 channels ADC Features Input path for externally generated tracking signal Advanced multibit DeltaSigma modulator 24-bit resolution Common Applications Differential inputs Discrete Class H automotive audio amplifiers -105 dB dynamic range (A-weighted) Automotive head units with internal Class H -88 dB THD+N amplifiers 2 Vrms full-scale input Audio mixing consoles Audio effects processors VD VA 2.5 VDC 5.0 VDC -1 -2 2.5 V LDO Analog Supply Gain Select Mode DC Offset Gain / Volume Select X Tracking Full Scale Code Master Max Envelope TPS SMPS X Vol . Cntrl Detect Tracking GAIN Enable Master Volume Select 0 dB Filter Mute, Invert, DAC X Select DAC & Interpolation Filter Noise Gate Volume Multi-bit AOUT 5 () Analog Modulators (SMPS Control ) Sample & Hold Filters th 5 DAC AIN1 () AOUT1 () Group Input Advisory Master AIN2 () AOUT2 () Delay Volume AIN3 () Channel Volume , DAC & AOUT3 () Multi-bit Control Interpolation Multi-bit AIN4 () Mute, Invert, Analog AOUT4 () ADC Filter Modulators Noise Gate Filters 0-500uS Digital Filters Low -Latency Mute, Invert, Sample Demux Noise Gate & Hold Serial Audio Interface Control Port Level Translator Frame Sync Serial Clock 2 SDOUTx SDIN 2 SDIN1 Master Clock In I C Control INT RST Clock / LRCK In / Out Data VL 1.8 to 5.0 VDC Copyright Cirrus Logic, Inc. 2014 OCT 14 (All Rights Reserved) DS899F2 CS4234 General Description The CS4234 is a highly versatile CODEC that combines 4 channels of high performance analog to digital conver- sion, 4 channels of high performance digital to analog conversion for audio, and 1 channel of digital to analog conversion to provide a nondelayed audio reference signal to an external Class H tracking power supply. If not used th to drive a tracking power supply, the 5 DAC can instead be used as a standard audio grade DAC, with performance specifications identical to that of the 4 DACs in the audio path. Additionally, the CS4234 includes tunable group de- lay for each of the 4 audio DAC paths to provide lead time for the external switch-mode power supply, and a nondelayed path into the DAC outputs for input signals requiring a low-latency path to the outputs. Targeting the automotive audio market, this controller was specifically designed to work with Apex Precision Powers CS44417 Class AB audio amplifier, but remains flexible enough to allow any standard Class AB amplifier to be op- erated as a Class H amplifier in order to maximize efficiency. Class H control provides significant efficiency gains over traditional Class AB amplifiers, while avoiding the increased electromagnetic interference (EMI) and cost of Class D amplifiers. The Class H controller provides a reference signal which tracks the envelope of the maximum (on a sample by sam- ple basis) of up to 32 channels of serial data in the TDM slots input on the SDINx lines. This reference signal is sent th to the 5 DAC to create an analog reference signal for an external switch-mode power supply that supplies rail volt- ages to an external Class AB amplifier, thereby turning any standard Class AB amplifier into a Class H amplifier. If desired, the internal tracking power supply circuitry can be bypassed, which allows a DSP generated tracking signal to be used to control the SMPS. This feature allows an unlimited number of channels to be tracked, using a DSP to create the tracking signal. This product is available in a 40-pin QFN package in Automotive (-40 C to +105 C) temperature grade. See Or- dering Information on page 74 for complete details. DS899F2 2