CS4205-KQ - AC'97 Stereo Audio Codec | Cirrus Logic
MPN： CS4205-KQ ✓ 啟用中CS4205-KQ 概覽
An audio codec is an interface IC that converts digital audio data into analog signals and analog audio inputs into digital data. In the signal chain, it sits between a host audio controller and external microphones, speakers, line inputs, or line outputs. AC'97 is a legacy Intel-defined audio interface that combines serialized digital audio with control, status, and general-purpose digital signals. The CS4205 therefore belongs to the broader audio codec, multimedia interface, and signal-conversion IC categories.
The manufacturer datasheet identifies the CS4205 as a stereo co-dec for portable-computing systems. Its AC'97 2.1 compliance supports host-controlled multimedia operation, while CrystalClear delta-sigma and mixed-signal circuitry provides the analog-to-digital and digital-to-analog conversion functions. The 48-LQFP package exposes the complete AC'97 interface and associated analog and power connections on a compact surface-mount footprint.
Technical implementation requires care because an audio codec combines sensitive analog inputs with a high-speed digital bus. The codec must be connected to a compatible AC'97 controller, supported audio drivers, analog input and output circuitry, and correctly decoupled supply rails. Clocking, digital signal integrity, analog grounding, output loading, and the relationship between the codec's sample rate and system timing must all be evaluated against the manufacturer datasheet.
Typical uses include notebook-computer multimedia subsystems, docking stations, portable audio hardware, and legacy PC docking solutions. The Cirrus Logic CS4205 is particularly relevant when maintaining or repairing an existing AC'97 platform rather than designing a new system around a modern USB or I2S audio interface. Its stereo codec function supports the familiar PC multimedia architecture but requires legacy host, driver, and connector support.
Designers should preserve the manufacturer's recommended decoupling and analog-layout practices and verify the exact pin assignments and signal names against the device documentation. AC'97 implementations can be sensitive to trace impedance, grounding, clock jitter, and power-supply noise. Because the CS4205-KQ is a legacy peripheral-oriented codec, software-driver availability and the continued support of the surrounding platform are as important as electrical compatibility.
This page consolidates verified distributor availability, pricing, interface details, package information, and application context. It also distinguishes documented drop-in alternatives from related legacy codecs, helping engineers avoid treating a merely similar audio codec as a guaranteed pin-to-pin replacement.
直接替換替代品，適用於 CS4205-KQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品CS4205-KQ 最大額定值與電氣特性
| Product Type | Stereo AC'97 audio codec |
| AC'97 Compliance | AC'97 2.1 compliant |
| Audio Architecture | Stereo co-dec |
| Signal Conversion Technology | CrystalClear delta-sigma and mixed-signal technology |
| Serial Audio Interface | AC'97, 20-bit serial |
| Associated Interface Resolution | 18-bit |
| 封裝 | 48-LQFP (7 mm x 7 mm) |
| 腳位數 | 48 pins |
| 安裝類型 | Surface mount |
| Target Application | PC multimedia systems and docking stations |
| Portability Classification | Portable computing |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Status | not_applicable |
CS4205-KQ 48-lqfp (7 mm x 7 mm) 腳位配置指南
CS4205-KQ（48-lqfp (7 mm x 7 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： CS4205-KQ.
請參閱 資料表 以查看完整腳位配置。
典型應用
CS4205-KQ 適用於 6 應用s: Legacy PC Docking-Station Audio, Portable-Computing Multimedia Audio, AC'97 Stereo Audio Interface, Analog Line-In and Line-Out Conversion, Legacy Notebook Audio Repair, Industrial Legacy Multimedia Controller.
Legacy PC Docking-Station Audio
The CS4205-KQ is appropriate for a legacy docking station whose host controller exposes an AC'97 audio interface. The codec provides the documented stereo co-dec function required to translate digital host audio into analog outputs while accepting analog input signals. Its AC'97 2.1 compliance makes it suitable for maintaining an established PC multimedia architecture rather than introducing a modern I2S or USB audio subsystem. Integration requires the original AC'97 clocking, host-driver support, analog input and output network, and a verified 48-LQFP footprint. Because the source material identifies docking stations explicitly, engineers can use the CS4205 as the reference device when reproducing an original board without substituting an electrically similar but unverified codec.
推薦
Portable-Computing Multimedia Audio
The CS4205-KQ can support portable-computing multimedia systems that retain an AC'97-compatible controller and operating-system audio path. The manufacturer describes the device as a stereo co-dec using CrystalClear delta-sigma and mixed-signal technology, positioning it for systems where analog headphone, microphone, or line-level functions must coexist with a digital host audio bus. Designers should preserve the reference decoupling and layout because the codec combines high-speed digital signaling with sensitive analog conversion. Driver availability and platform support are essential constraints for this legacy interface. The part is best suited to repair, industrial延续, and legacy-platform replication projects where the original AC'97 ecosystem remains available.
推薦
AC'97 Stereo Audio Interface
The CS4205-KQ is designed for an AC'97 stereo interface implementation in which a host multimedia controller and codec exchange serialized digital audio. Its documented AC'97 2.1 compliance provides a defined starting point for a board using the 20-bit serial interface, while the 18-bit associated resolution matches the distributor interface classification. The implementation must account for the codec's complete pinout, clock source, digital signal termination or routing, and analog conversion circuitry. This application is relevant to legacy embedded systems and specialized industrial equipment that retained AC'97 for compatibility. Component substitution should not be based on the AC'97 label alone because converter architecture, pin assignments, and host-driver expectations must also match.
推薦
Analog Line-In and Line-Out Conversion
The CS4205-KQ can serve as the mixed-signal conversion element in a legacy PC audio subsystem that needs analog line input and stereo output functions around an AC'97 host. Its delta-sigma and mixed-signal implementation is identified directly in the manufacturer documentation, while the stereo co-dec architecture supports simultaneous playback and capture functions defined by the platform. Engineers must use the original analog reference, recommended capacitors, grounding plan, and output topology because component values and routing materially affect channel balance and noise. Since the verified excerpts do not disclose full analog specifications, the manufacturer datasheet remains the controlling source. This use case is strongest for legacy equipment restoration and controlled system replication, not new low-cost consumer designs.
推薦
Legacy Notebook Audio Repair
The CS4205-KQ is useful in a repair or component-replacement workflow for a legacy notebook whose motherboard previously used this Cirrus Logic AC'97 stereo codec. Retaining the original MPN preserves the intended converter architecture, AC'97 2.1 interface behavior, and 48-LQFP assembly method, while distributor records indicate current availability through several suppliers. A repair engineer should still compare board revisions because clock routing, analog components, and power sequencing may vary between designs. The part should not be assumed compatible with a visually similar codec on the board; verify the complete manufacturer marking and pinout. For long-term maintenance, obtaining the original datasheet and inspecting the surrounding application circuit are more reliable than using a generic cross-reference result.
推薦
Industrial Legacy Multimedia Controller
The CS4205-KQ can support specialized industrial or embedded equipment that retains an AC'97 host controller for backward compatibility with a proven multimedia subsystem. The codec's stereo co-dec function and AC'97 2.1 compliance allow the system to retain established digital-audio routing without redesigning the host interface. Such equipment may need long continuity of supply and exact board-level replacement rather than a broadly similar codec. In this setting, manufacturer documentation, package drawings, and application support are more valuable than an unverified equivalence listing. The available $2.5851 starting distributor price as of 2026-10-28 should be checked against current stock and lifecycle commitments before committing the product to a long-lived industrial program.
推薦
推薦產品摘要
工程參考資料，適用於 CS4205-KQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 48-LQFP (7 mm x 7 mm) |
| Brand | Cirrus Logic Inc. |
| Product Type | Stereo audio codec |
| Host Audio Interface | AC'97 2.1 |
| Serial Audio Resolution | 20-bit |
| Associated Interface Resolution | 18-bit |
| Conversion Architecture | CrystalClear delta-sigma and mixed-signal technology |
| Target Systems | PC multimedia systems, portable computing, and docking stations |
| Verified Starting Price | $2.5851 as of 2026-10-28 |
| RoHS Status | unknown |
主要差異化特點
- Explicitly documented AC'97 2.1 stereo co-dec (對比CS4216-KL)
- Defined CrystalClear conversion architecture (對比Unspecified related CS42xx codecs)
- Verified 48-LQFP implementation (對比CS4216-KL)
設計說明
Treat the CS4205-KQ as a mixed-signal device even though its principal digital interface is AC'97. Follow the manufacturer’s recommended analog and digital partitioning, provide a continuous ground reference beneath the device, and route high-speed clock and data signals away from microphone and line-input traces. The verified excerpts do not reproduce the complete layout drawing, so engineers should obtain the original datasheet before finalizing trace spacing, guard structures, or component placement.
Use the supply values, bypass requirements, and power-up sequence stated in the manufacturer datasheet; do not infer them from the AC'97 interface name. Decoupling components should be positioned close to their intended pins, with adequate return paths for switching current. Because the supplied search excerpts do not expose the CS4205 pin table or voltage limits, the original documentation must be used for all rail and capacitor decisions.
Do not install CS4216-KL or another related Cirrus Logic codec solely because it appears in a family listing. A valid replacement requires confirmation of the 48-LQFP footprint, every pin assignment, AC'97 timing, clock architecture, analog conversion functions, supply requirements, and software-driver support. For repairs, first verify the original board revision and the manufacturer marking of the removed component.
合規資訊
The supplied verified excerpts do not provide explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable because the part is a legacy multimedia audio codec rather than an automotive-qualified device.
