104 dB, 24-Bit, 192 kHz Stereo Audio ADC # Technical Documentation: CS5345CQZ 24-Bit, 192 kHz Stereo A/D Converter
Manufacturer : Cirrus Logic
Document Version : 1.0
Last Updated : October 2023
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## 1. Application Scenarios
### 1.1 Typical Use Cases
The CS5345CQZ is a high-performance, 24-bit, 192 kHz stereo analog-to-digital converter (ADC) designed for professional and consumer audio applications requiring exceptional signal fidelity. Its primary function is to convert analog audio signals into high-resolution digital audio streams for further processing, storage, or transmission.
Primary Use Cases Include:
* Digital Audio Recording Systems: Capturing microphone, instrument, or line-level signals in studio interfaces, field recorders, and mixing consoles.
* Broadcast & Professional Audio Equipment: Used in broadcast mixers, digital audio workstations (DAWs), and public address (PA) system digitizers where low-noise, wide dynamic range conversion is critical.
* High-End Consumer Audio: Integrated into premium soundbars, A/V receivers, Blu-ray players, and set-top boxes to digitize analog inputs (e.g., RCA, 3.5mm aux) for digital signal processing (DSP).
* Measurement & Analysis Systems: Employed in audio test equipment and analyzers due to its high linearity and low distortion, enabling precise measurement of analog audio signals.
### 1.2 Industry Applications
* Pro Audio & Musical Instruments: Studio-grade audio interfaces, digital mixing consoles, guitar multi-effects processors, and keyboard workstations.
* Consumer Electronics: High-definition televisions (HDTVs), home theater systems, gaming consoles, and digital media adapters.
* Telecommunications & Conferencing: Professional conferencing systems and VoIP equipment that require high-quality audio capture.
* Automotive Infotainment: Premium in-car audio systems for digitizing outputs from legacy sources (e.g., CD changers) before DSP.
### 1.3 Practical Advantages and Limitations
Advantages:
* High Performance: Offers a dynamic range of up to 105 dB and a total harmonic distortion plus noise (THD+N) as low as -94 dB, ensuring transparent audio capture.
* Flexible Interface: Supports multiple serial audio data formats (I²S, left-justified, right-justified) and master/slave clocking modes, ensuring compatibility with a wide range of digital audio processors, DSPs, and microcontrollers.
* Integrated Functionality: Includes on-chip digital high-pass filters (DC blocking) and phase-linear anti-aliasing filters, reducing external component count and simplifying design.
* Low Power Consumption: Typically operates at 90 mW (at 5V), making it suitable for portable and power-sensitive applications.
* Single Supply Operation: Simplifies power system design by operating from a single 4.5V to 5.5V analog supply, with a separate digital I/O supply (2.7V to 5.5V) for level shifting.
Limitations:
* Analog Input Structure: Requires external operational amplifiers to buffer and scale line-level or microphone signals to its specific differential input voltage range (typically 3.1 Vpp differential max). It is not a complete "mic-to-digital" solution.
* Clock Sensitivity: Performance is highly dependent on a clean, low-jitter master clock. Poor clock integrity directly degrades SNR and THD+N performance.
* No On-Chip PGA: Lacks a programmable gain amplifier (PGA), meaning analog gain must be set entirely in the external front-end circuitry, which can increase design complexity for microphone preamplification.
* Thermal Considerations: In small-form-factor or densely packed designs, the
