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STAC9750 Arkusz danych(PDF) 5 Page - Integrated Device Technology |
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STAC9750 Arkusz danych(HTML) 5 Page - Integrated Device Technology |
5 / 73 page STAC9750/9751 VALUE-LINE TWO-CHANNEL AC’97 CODECS PC AUDIO IDT™ 5 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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