STAC9750 Datasheet, PDF (1/73 Pages) Integrated Device Technology – VALUE-LINE TWO-CHANNEL AC’97 CODECS

VALUE-LINE TWO-CHANNEL AC’97 CODECS
DATASHEET
STAC9750/9751
OVERVIEW
Value-Line Stereo AC'97 CODECs with headphone drive
and SPDIF outputs.
FEATURES
• Full Duplex Stereo 18-bit ADCs and 20-bit DACs
• 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 STAC9700/21/56/66
• IDT Surround (SS3D) Stereo Enhancement
• Energy Saving Dynamic Power Modes
KEY SPECIFICATIONS
• Analog LINE_OUT SNR: 90dB
• Digital DAC SNR: 89dB
• Digital ADC SNR: 85dB
• Full-scale Total Harmonic Distortion: 0.005%
• Crosstalk between Input Channels: -70dB
• Spurious Tone Rejection: 100dB
RELATED MATERIALS
• Data Sheet
• Reference Designs for MB, CNR, ACR and PCI
applications
• Audio Precision Performance Plots
DESCRIPTION
IDT's STAC9750/9751 are general purpose, full duplex,
audio CODECs conforming to the analog component spec-
ification of AC'97 (Audio CODEC 97 Component Specifica-
tion Rev. 2.2). They have 18-bit ADCs and 20-bit DACs.
The STAC9750/9751 incorporate IDT's proprietary Σ∆ tech-
nology to achieve a DAC SNR in excess of 89dB.
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 and also an output that
supports the SPDIF format.
The STAC9750/9751 is a standard 2-channel stereo
CODEC. With IDT’s headphone drive capability, head-
phones can be driven with no external amplifier.
The STAC9750/9751 may be used as a secondary
CODEC, with the STAC9700/21/44/56/08/84/66 as the pri-
mary, 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 appli-
cations.
The STAC9750/9751 communicates via the five-wire
AC-Link to any digital component of AC'97, providing flexi-
bility in the audio system design.
The STAC9750/9751 supports General Purpose Input/Out-
put (GPIO), as well as SPDIF output. These digital I/O
options provide for a number of advanced architectural
implementations, with volume controls and digital mixing
capabilities built directly into the CODEC.
Packaged in an AC'97 compliant 48-pin TQFP, the
STAC9750/9751 can be placed on the motherboard,
daughter boards, PCI, AMR, CNR, or ACR cards.
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
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STAC9750/9751
V 5.8 103106