CS4280-CM Audio Volume Control IC | Cirrus Logic | PCI
料号： CS4280-CM ✗ 停产CS4280-CM 概述
An audio volume-control IC is a specialized interface-circuit category that controls signal level and coordinates an audio subsystem with its digital host. Within the broader hierarchy, the CS4280-CM belongs to the audio special-purpose interface IC class, which falls under interface ICs and ultimately integrated circuits. Its role differs from a general-purpose audio codec: the volume-control device manages gain and supporting control functions, while the companion codec performs much of the audio conversion and signal processing. This division of responsibilities was common in PCI-based sound-card architectures.
The CS4280-CM combines digital gain control with internal synchronization support. The integrated phase-locked loop can provide the timing reference required for coordinated digital audio operations, while the asynchronous digital serial interface allows the host controller to exchange control information with the device. On-chip digital gain provides software-addressable level adjustment without relying exclusively on an external passive attenuator. Together, these features support centralized volume control, mute-related system management, and coordinated operation with a companion audio codec.
The CS4280 belongs to a family of legacy Crystal Semiconductor and Cirrus Logic audio devices designed for personal-computer sound-card implementations. Verified cross-reference information identifies CS4281-CM as an alternative, and the CS4280 is documented as pin-compatible with the earlier CS4614 and CS4622/CS4624 families. These relationships are useful for repair and legacy-platform work, although board-level compatibility must include verification of supply rails, clocking, software registers, and companion codec requirements. The MQFP package is intended for surface-mount assembly and provides a large, inspectable footprint compared with modern compact audio IC packages.
Typical uses include CrystalClear PCI sound cards, DOS-era and Windows 98-era multimedia computers, multi-function audio adapters, and legacy industrial or retrocomputing systems that retain support for the CS4280 and its associated drivers. The CS4297-JQ is a relevant companion because verified sources specifically describe the CS4280 as commonly used with the CS4297 codec. The CS4216-KL represents another nearby audio-interface family that may be relevant when comparing platform architectures, although it is not presented as a direct substitute for the CS4280-CM.
When repairing or repurposing a board, verify the complete 100-pin footprint, 3.3 V and 5 V rail requirements, clock connections, serial interface topology, and codec handshake before ordering. The documented 0°C to +70°C range limits deployment to commercial-temperature environments unless the surrounding system and the actual sourced component provide wider qualification. Because the verified material identifies the CS4280 family as an obsolete or end-of-life product, procurement planning should emphasize authorized inventory, traceable sourcing, and a full functional test after replacement.
直接替换替代料： CS4280-CM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
CS4281-CM
✅ 直接替换📋 参考替代料（不在目录中）
CS4280-CM 最大额定值与电气特性
| Device Type | Audio Volume Control and Power Management IC |
| Audio Channel Count | 1 channel |
| 封装 | 100-pin MQFP (20 mm x 14 mm) |
| 安装类型 | Surface mount |
| Minimum Operating Temperature | 0°C |
| Maximum Operating Temperature | +70°C |
| Low Supply Voltage Range | 3 V to 3.6 V |
| High Supply Voltage Range | 4.75 V to 5.25 V |
| Phase-Locked Loop | Built-in phase-locked loop |
| Gain Control | On-chip digital gain |
| Digital Interface | Asynchronous digital serial interface |
| Power Management Features | Advanced power-management features |
| Primary Application | PCI audio interface and audio volume control |
| Legacy Audio Platform | CrystalClear PCI audio |
| Documented Compatible Earlier Families | CS4614 and CS4622/CS4624 |
| Documented Companion Codec | CS4297 |
| RoHS 状态 | RoHS |
CS4280-CM 100-pin mqfp (20 mm x 14 mm) 引脚配置指南
CS4280-CM（100-pin mqfp (20 mm x 14 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： CS4280-CM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
CS4280-CM 适用于 6 应用s: Legacy PCI Sound Cards, DOS and Windows 98 Multimedia Systems, Retro Sound-Card Reproduction, Professional Legacy Audio Upgrade, Industrial Legacy Audio Control, Audio Interface Research and Education.
Legacy PCI Sound Cards
The CS4280-CM is suitable for restoring a CrystalClear PCI audio adapter because the verified documentation identifies it as a CrystalClear PCI audio interface with a one-channel volume-control role and a built-in phase-locked loop. It can sit beside a compatible audio codec such as the CS4297 and provide coordinated digital gain and power management. The 3.3 V and 5 V supply ranges, 0°C to +70°C rating, and 100-pin MQFP footprint match the legacy platform architecture, but board continuity, clock routing, and codec handshake must be reproduced exactly.
推荐
DOS and Windows 98 Multimedia Systems
The CS4280-CM can support service and restoration of DOS-era and Windows 98-era multimedia PCs that rely on the CrystalClear audio architecture. Its integrated phase-locked loop, on-chip digital gain, asynchronous digital serial interface, and power-management functions are particularly relevant to a host-controlled legacy sound-card design. Because the component is obsolete and limited to the verified commercial-temperature range, procurement should use traceable distributor inventory and the repaired board should be tested for boot, playback, recording, and full-volume operation.
推荐
Retro Sound-Card Reproduction
The CS4280-CM provides the legacy control and synchronization functions needed to reproduce a historically accurate PCI sound card rather than substituting a modern codec with a different footprint. Its documented one-channel volume-control function, on-chip digital gain, and asynchronous digital serial interface preserve the character of the original architecture. The 100-MQFP package also makes the design inspectable after assembly, although the complete 100-pin netlist must be taken from the CS4280 family documentation and validated against the selected codec and bus interface.
推荐
Professional Legacy Audio Upgrade
A project that retains a CrystalClear PCI audio signal path can use the CS4280-CM to add or replace digital volume control while preserving legacy software behavior. The built-in phase-locked loop supports coordinated digital audio timing, and the asynchronous serial interface permits host-controlled gain management. This approach is appropriate when old operating systems, drivers, or external hardware depend on the original controller topology. It is not appropriate when new-format drivers, compact packaging, or current compliance and lifecycle expectations are primary requirements.
推荐
Industrial Legacy Audio Control
The CS4280-CM can be used in an older industrial or institutional computer that still depends on a CrystalClear-compatible PCI audio subsystem. Its documented 3.3 V and 5 V supplies, digital gain, clock synchronization, and power-management functions suit an established control topology. The verified 0°C to +70°C operating range means it should be used only in commercial-temperature conditions unless the exact sourced part has broader qualification documentation. Repair designs should also include functional testing at maximum gain to uncover aged-codec or grounding problems.
推荐
Audio Interface Research and Education
The CS4280-CM is useful in a laboratory exercise or retro-computing research platform for demonstrating how a host-controlled volume-control IC cooperates with a separate audio codec. Its one-channel function, integrated phase-locked loop, asynchronous digital serial interface, and on-chip digital gain expose important concepts in clocking, serial control, gain programming, and mixed-signal partitioning. The CS4297-JQ is the preferred documented companion because it enables a faithful representation of the historical architecture rather than an improvised modern substitute.
推荐
推荐产品汇总
工程参考数据： CS4280-CM ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CS4281-CM | CS4280-CQ |
|---|---|---|---|
| Package | 100-MQFP (20x14) | 100-MQFP (20x14) | 100-MQFP (20x14) |
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic |
| Device Type | Audio Volume Control and Power Management IC | Audio volume-control family device | CS4280 family audio volume-control device |
关键差异点
- Documented in-family cross-reference （对比 CS4281-CM)
- Preserves the CrystalClear PCI architecture （对比 CS4216-KL)
- Documented CS4297 companion relationship （对比 CS4280-CQ)
设计说明
Validate both documented supply domains, 3 V to 3.6 V and 4.75 V to 5.25 V, with the CS4280 family datasheet before energizing a repaired board. Check sequencing, tolerance, local decoupling, and return-current paths at the MQFP pins. Because this is an obsolete legacy device, unstable rails can masquerade as codec or clock failures.
Reproduce the manufacturer’s complete 100-pin MQFP footprint and pin assignments rather than relying on a visually similar package or a generic audio-codec symbol. Pay particular attention to clock, serial data, serial control, reset, power-management, analog-audio, and ground connections. Confirm pad and courtyard dimensions against the original board artwork before ordering replacement parts.
Do not assume that pin compatibility with the CS4614 or CS4622/CS4624 families makes those devices interchangeable at the software level. Host registers, PCI behavior, codec support, clock requirements, and initialization sequences must be compared with the manufacturer documents. For CS4281-CM, perform a hardware-in-the-loop test because the verified excerpts do not quantify every parameter difference.
Route clock and asynchronous serial-control signals away from analog audio paths, maintain the documented return paths, and keep the MQFP ground connections directly connected to the board plane. The built-in phase-locked loop supports synchronization, but correct loop behavior still depends on clean power and clock routing. Compare the companion CS4297 implementation to identify the intended source and termination arrangement.
合规信息
The verified Lisleapex distributor listing labels the CS4280-CM as RoHS. No verified REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements were supplied.
