STAC9750 datasheet(5/73 Pages) IDT

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STAC9750/9751

VALUE-LINE TWO-CHANNEL AC’97 CODECS

PC AUDIO

IDT™

STAC9750/9751

V 5.8 103106

VALUE-LINE TWO-CHANNEL AC’97 CODECS

1. PRODUCT BRIEF

1.1.

Features

•

Full duplex stereo 18-bit ADC and 20-bit DAC

•

AC’97 Rev 2.2-compliant

•

High performance

Σ∆ technology

•

SPDIF output

•

Crystal elimination circuit

•

Headphone amplifier

•

Independent sample rates for ADCs & DACs (hardware SRCs)

•

20dB or 30dB microphone boost capability

•

90dB SNR LINE-LINE

•

5-Wire AC-Link protocol compliance

•

Digital-Ready architecture

•

General Purpose I/O

•

+3.3 V (STAC9751) and +5 V (STAC9750) analog power supply options

•

Pin compatible with the STAC9700/21/44/08/56/66/52

•

IDT Surround (SS3D) Stereo Enhancement

•

Energy saving dynamic power modes

1.2.

Description

IDT's STAC9750/9751 are general purpose 18-bit ADC, 20-bit DAC, full duplex, audio CODECs con-

forming to the analog component specification of AC'97 (Audio Codec ‘97 Component Specification

Rev. 2.2). The STAC9750/9751 incorporate IDT's proprietary

Σ∆ technology to achieve a DAC SNR

in excess of 90 dB. The DACs, ADCs, and mixer are integrated with analog I/Os, which include four

analog line-level stereo inputs, two analog line-level mono inputs, two stereo outputs, and one mono

output channel. The STAC9750/9751 include digital input/output capability for support of modern PC

systems with an output that supports the SPDIF format. The STAC9750/9751 is a standard 2-chan-

nel stereo CODEC. With IDT’s headphone drive capability, headphones can be driven with no exter-

nal amplifier. The STAC9750/9751 may be used as a secondary CODEC, with the STAC9700/21/44/

56/08/84/66 as the primary, in a multiple CODEC configuration conforming to the AC'97 Rev. 2.2

specification. This configuration can provide the true six-channel, AC-3 playback required for DVD

applications. The STAC9750/9751 communicates via the five-wire AC-Link to any digital component

of AC'97, providing flexibility in the audio system design. Packaged in an AC'97 compliant 48-pin

LQFP, the STAC9750/9751 can be placed on a motherboard, daughter boards, PCI, AMR, CNR, or

ACR cards.

The STAC9750/9751 block diagram is illustrated in Figure 1. It provides variable sample rate Digi-

tal-to-Analog (DA) and Analog-to-Digital (AD) conversion, mixing, and analog processing. Supported

audio sample rates include 48 KHz, 44.1 KHz, 32 KHz, 22.05 KHz, 16 KHz, 11.025 KHz, and 8 KHz;

additional rates are supported in the STAC9750/9751 soft audio drivers. The digital interface com-

municates with the AC'97 controller via the five-wire AC-Link and contains the 64-word by 16-bit reg-

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