NXP Semiconductors SAA7324H/M2B,557

Overview

SAA7324H/M2B,557 from NXP Semiconductors (formerly Philips) is a single-chip digital servo processor and Compact Disc decoder with integrated bitstream DAC (CD10 II architecture). It performs EFM demodulation, C1/C2 error correction (t=2, e=4), 96fs bitstream DAC conversion, focus/radial servo control, and subcode processing (Q-channel, CD graphics, V4 interface). It operates at 1× to 4× disc speed and supports lock-to-disc mode for ESA systems in portable CD players.

For engineers reviewing the SAA7324H/M2B,557 datasheet, SAA7324H/M2B,557 pinout, SAA7324H/M2B,557 application, or SAA7324H/M2B,557 equivalent, this page delivers verified functional scope, confirmed DAC SNR (−90 dB), crystal frequency support (8.4672–33.8688 MHz), FIFO-based concealment, and I²C/4-wire microcontroller interface details - all critical for CD mechanism design and audio subsystem integration.

Technical Context

The SAA7324H/M2B,557 integrates three core subsystems: a fully digital CD decoder with 8-frame FIFO and t=2/e=4 Reed-Solomon correction; a servo controller supporting focus/radial loops with automatic gain control, off-track detection, and pulsed sledge drive; and an on-die 96fs bitstream DAC with differential outputs (LN/LP/RN/RP) and −90 dB SNR. All operate under a unified clock architecture using internal PLL multiplication from 8.4672/16.9344/33.8688 MHz crystals.

It implements dual-mode audio output: native I²S/EIAJ serial interface for external DACs, and loopback-capable serial input (SDI/SCLI/WCLI) to feed external ESA buffers into its onboard DAC. Subcode handling includes EIAJ CP-2401 3-/4-wire CD graphics, V4 RS232-style Q-to-W output, and EBU-format DOBM output - all programmable via decoder and shadow registers.

Key Specifications

Pinout & Package

Package: QFP64 (plastic quad flat package; 64 leads; body 14 × 14 × 2.7 mm; SOT393-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CD decoder and servo applications.

Compared with SAA7324H/M2B,557, the SAA7322H removes DAC integration to reduce cost and power but increases system component count, while the SAA7375H extends functionality to recordable media at the expense of package size and layout compatibility - making SAA7324H/M2B,557 optimal for cost-constrained, fixed-media CD player designs.

Availability

SAA7324H/M2B,557 is available at Aetrix Electronics and suitable for portable CD players, automotive head units, CD-ROM drives, and CD+G karaoke systems requiring stable component supply and long-lifecycle support.

Supply support for SAA7324H/M2B,557 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors (originally Philips Semiconductors) is a global leader in high-performance mixed-signal ICs for consumer, automotive, and industrial applications, with deep heritage in optical storage technology.

The SAA7324H/M2B,557 belongs to the CD10 II family of single-chip CD decoder/servo solutions, designed specifically for cost-effective, low-power, and mechanically robust Compact Disc playback in portable and embedded platforms.

FAQ

What is the primary function of the SAA7324H/M2B,557 in a CD player system?

The SAA7324H/M2B,557 serves as the central digital signal processor in CD players, integrating CD decoding (EFM demodulation, C1/C2 error correction), servo control (focus/radial actuator drive), and analog audio conversion (96fs bitstream DAC). It replaces multiple discrete ICs, enabling compact, low-power designs for portable and automotive applications while maintaining full Red Book compliance.

Does the SAA7324H/M2B,557 support CD-R or CD-RW playback?

No, the SAA7324H/M2B,557 is designed exclusively for CD-DA (audio CD) and CD-ROM playback per the Red Book standard. It lacks the extended error correction, wobble signal processing, and ATIP decoding required for CD-R/CD-RW compatibility. For recordable media support, NXP's SAA7375H (CD10 III) is the designated successor.

How does the lock-to-disc mode work in the SAA7324H/M2B,557?

Lock-to-disc mode in the SAA7324H/M2B,557 disables FIFO buffering and dynamically adjusts the I²S output clock (WCLK/SCLK) to match actual disc rotation speed. This allows Constant Angular Velocity (CAV) playback with variable data rates - essential for Electronic Shock Absorption (ESA) systems. The mode is enabled via decoder register E and supports disc speeds from 25% to 100% of nominal.

What are the supported crystal frequencies for the SAA7324H/M2B,557?

The SAA7324H/M2B,557 supports three standard crystal frequencies: 8.4672 MHz (fundamental), 16.9344 MHz (fundamental), and 33.8688 MHz (third-overtone). An internal PLL multiplier (controlled by SELPLL and decoder register B) generates required system clocks (CL16, CL11/4) - eliminating need for multiple crystals or external clock generators.

Can the SAA7324H/M2B,557 be used with an external DAC instead of its onboard DAC?

Yes, the SAA7324H/M2B,557 supports external DAC interfacing via its 3-state serial output pins (DATA, WCLK, SCLK, EF) in I²S or EIAJ format. Decoder register 3 configures data format and word length. When external DAC mode is selected, the onboard DAC outputs (LN/LP/RN/RP) are disabled, and the KILL pin can deactivate external DAC during digital silence to reduce power consumption.