Renesas STAC9753XXTAEB2X

Overview

STAC9753XXTAEB2X from IDT is a 20-bit, full-duplex, AC'97 Rev. 2.3-compliant stereo audio codec with integrated headphone driver (50 mW), SPDIF digital output, and on-chip microphone/jack sensing. It operates from a +3.3 V analog supply, supports independent ADC/DAC sample rates up to 48 kHz, and achieves ≥90 dB SNR line-to-line. It targets PC motherboard and add-in card audio subsystems requiring secondary/tertiary CODEC functionality in multi-CODEC DVD playback configurations.

For engineers reviewing the STAC9753XXTAEB2X datasheet, STAC9753XXTAEB2X pinout, STAC9753XXTAEB2X application, or STAC9753XXTAEB2X equivalent, key selection criteria include AC-Link 5-wire interface compliance, 20-bit SPDIF output capability, internal jack sensing logic, crystal elimination circuit support, and compatibility with Intel AC'97 Rev. 2.3 multi-CODEC addressing schemes.

Technical Context

The STAC9753XXTAEB2X implements a dual-path Σ∆ architecture with separate 20-bit ADC and DAC data converters, each supporting variable sample rates (8–48 kHz) via AC-Link frame timing control. Its mixer integrates six analog line-level inputs, two stereo outputs, and one mono output, with programmable gain stages including 0–30 dB microphone boost.

Digital interface operation follows the AC'97 5-wire AC-Link protocol (BITCLK, SYNC, RESET#, SDATA_IN, SDATA_OUT), with slot-based framing for command/status exchange and PCM audio transport. The device supports extended paging registers, EAPD control, GPIO configuration, and low-power modes including AC-Link suspend and analog power-down states.

Key Specifications

Pinout & Package

Packaged in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch), the STAC9753XXTAEB2X uses a standard AC'97-compliant footprint compatible with STAC9750 and STAC9766.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC'97 audio codec applications.

Compared with STAC9750 and STAC9766, the STAC9753XXTAEB2X uniquely balances cost, feature set, and +3.3 V analog compatibility-making it optimal for mainstream desktop motherboards needing SPDIF and jack sensing without premium 3D enhancements.

Availability

STAC9753XXTAEB2X is available at Aetrix Electronics and suitable for desktop PC motherboard design, DVD playback systems, and PCI/AMR audio add-in cards requiring stable component supply across long production lifecycles.

Supply support for STAC9753XXTAEB2X 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, RF, and audio solutions for computing and communications infrastructure.

The STAC9753XXTAEB2X belongs to IDT's AC'97 audio codec product line, designed specifically for cost-sensitive, high-volume PC platform audio subsystems requiring AC'97 Rev. 2.3 compliance and integrated analog functionality.

FAQ

What is the analog supply voltage requirement for STAC9753XXTAEB2X?

The STAC9753XXTAEB2X requires a +3.3 V analog supply (VCCA), as confirmed in Section 2.1.6 of the datasheet. This distinguishes it from the STAC9752 variant, which uses +5 V. Using incorrect voltage risks permanent damage or undefined operation. Always decouple VCCA with 1 µF ceramic and 10 µF tantalum capacitors near the package.

Does STAC9753XXTAEB2X support independent ADC and DAC sample rates?

Yes, the STAC9753XXTAEB2X supports independent sample rate configuration for ADC and DAC paths, as specified in the "PCM DAC Rate Registers" and "PCM LR ADC Rate" register descriptions (Sections 8.1.21–8.1.23). Valid rates range from 8 kHz to 48 kHz, enabling simultaneous voice capture at 8 kHz while playing back music at 44.1 kHz.

How does the crystal elimination circuit in STAC9753XXTAEB2X work?

The crystal elimination circuit in STAC9753XXTAEB2X recovers a stable 12.288 MHz or 24.576 MHz clock from the incoming BITCLK signal using an internal PLL, eliminating the need for an external crystal oscillator. This reduces BOM cost and PCB area, and is enabled automatically when no crystal is attached to X1/X2 pins.

Is STAC9753XXTAEB2X pin-compatible with STAC9750 and STAC9766?

Yes, STAC9753XXTAEB2X is 100% pin-compatible with both STAC9750 and STAC9766, as explicitly stated in the datasheet Features section. All three share identical 48-pin LQFP pinout, power pin assignments, and AC-Link interface layout-enabling drop-in replacement in existing layouts where functional differences are acceptable.

What is the maximum headphone output power of STAC9753XXTAEB2X?

The STAC9753XXTAEB2X delivers 50 mW per channel into a 32 Ω load, as documented in the Features list and electrical specifications. This meets standard headphone impedance requirements and eliminates the need for external amplification in most desktop and notebook audio implementations.