Renesas STAC9753XXTAEB2XR

Overview

STAC9753XXTAEB2XR 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 analog jack/microphone sensing. It supports independent ADC/DAC sample rates up to 48 kHz, achieves ≥90 dB SNR (line-to-line), and operates from a +3.3 V analog supply - designed for secondary/tertiary audio roles in DVD-capable multi-CODEC PC systems.

For engineers reviewing the STAC9753XXTAEB2XR datasheet, STAC9753XXTAEB2XR pinout, STAC9753XXTAEB2XR application, or STAC9753XXTAEB2XR equivalent, key selection criteria include AC-Link 5-wire interface compatibility, 20-bit SPDIF output capability, internal microphone boost (0–30 dB), crystal elimination circuit, and 48-pin TQFP package with EAPD and GPIO support.

Technical Context

The STAC9753XXTAEB2XR implements a sigma-delta (Σ∆) architecture for both ADC and DAC paths, enabling >89 dB SNR through mixer and DAC stages. Its AC-Link interface uses fixed 12.288 MHz bit clock with variable sample rate signaling, supporting primary/secondary CODEC addressing via TAG bits and slot-based frame structure (13-slot bi-directional frames).

It integrates analog I/O including six line-level inputs (four stereo, two mono), two stereo outputs, one mono output, and dedicated sensing circuits for headphone jack insertion and microphone presence detection - all managed via extended AC'97 paging registers and configurable GPIO pins.

Key Specifications

Pinout & Package

Packaged in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch), the STAC9753XXTAEB2XR features exposed thermal pad for enhanced thermal dissipation in high-density motherboard layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STAC9750 and STAC9766, the STAC9753XXTAEB2XR uniquely balances SPDIF capability, integrated sensing, and 3.3 V operation - making it optimal for mid-tier DVD-capable motherboards where digital output and automatic peripheral detection are essential but advanced 3D processing is not required.

Availability

STAC9753XXTAEB2XR is available at Aetrix Electronics and suitable for desktop motherboard audio, DVD playback systems, laptop docking stations, and legacy PCI audio cards requiring stable component supply and long-term industrial availability.

Supply support for STAC9753XXTAEB2XR 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, communications, and industrial markets.

The STAC9753XXTAEB2XR belongs to IDT's AC'97 audio codec family, engineered specifically for cost-sensitive, high-integration PC audio subsystems requiring compliance with Intel's AC'97 Rev. 2.3 specification.

FAQ

What is the analog supply voltage requirement for STAC9753XXTAEB2XR?

The STAC9753XXTAEB2XR requires a +3.3 V analog supply, distinguishing it from the +5 V STAC9752 variant. This matches standard PC motherboard power domains and simplifies power rail design. The device specifies tight regulation tolerance (±5%) and low-noise filtering requirements to maintain ≥90 dB SNR performance. All analog I/O circuits - including headphone amplifier, ADC front-end, and microphone bias - operate from this single rail.

Does STAC9753XXTAEB2XR support multiple CODEC configurations?

Yes, STAC9753XXTAEB2XR supports primary, secondary, and tertiary CODEC roles per AC'97 Rev. 2.3. It uses CODEC ID strapping and TAG-bit decoding on AC-Link Slot 0 to distinguish address space. In multi-CODEC setups, STAC9753XXTAEB2XR typically handles headphone output and SPDIF passthrough while offloading main speaker duties to a primary CODEC like STAC9700 or STAC9744 - enabling true 5.1-channel DVD audio.

How does the crystal elimination circuit in STAC9753XXTAEB2XR function?

The crystal elimination circuit in STAC9753XXTAEB2XR derives all internal clocks-including master sample rate clocks-from the AC-Link BITCLK signal (12.288 MHz), eliminating the need for an external 24.576 MHz crystal oscillator. This reduces BOM count, board space, and startup delay while maintaining precise jitter performance required for 20-bit audio conversion. Clock stability is maintained via internal PLL lock detection and fail-safe reset behavior.

What headphone output capability does STAC9753XXTAEB2XR provide?

STAC9753XXTAEB2XR delivers 50 mW per channel into 32 Ω loads at ≤1% THD+N, enabling direct connection of standard stereo headphones without external amplification. The output includes integrated DC-blocking capacitors, short-circuit protection, and EAPD-controlled power-down synchronized with jack insertion sensing - reducing pop/click artifacts and improving system power efficiency.

Is STAC9753XXTAEB2XR pin-compatible with other IDT AC'97 codecs?

Yes, STAC9753XXTAEB2XR is 100% pin-compatible with STAC9750 and STAC9766, and pin-compatible with STAC9700, STAC9721, and STAC9756. This allows drop-in replacement in existing designs - though functional differences (e.g., missing SPDIF in STAC9750 or enhanced 3D in STAC9766) require firmware and layout verification before substitution.