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STAC9751XXTAEYYX Datasheet

  • STAC9751XXTAEYYX

  • VALUE-LINE TWO-CHANNEL AC’97 CODECS

  • 73頁(yè)

  • IDT

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DATASHEET
VALUE-LINE TWO-CHANNEL AC鈥?7 CODECS
OVERVIEW
Value-Line Stereo AC'97 CODECs with headphone drive
and SPDIF outputs.
STAC9750/9751
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
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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鈥檚 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.
FEATURES
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Full Duplex Stereo 18-bit ADCs and 20-bit DACs
AC鈥?7 Rev 2.2 Compliant
High Performance
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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
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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
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Data Sheet
Reference Designs for MB, CNR, ACR and PCI
applications
Audio Precision Performance Plots
IDT鈩?/div>
VALUE-LINE TWO-CHANNEL AC鈥?7 CODECS
1
STAC9750/9751
V 5.8 103106

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