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STAC9750 の電気的特性と機能
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STAC9750のメーカーはIDTです、この部品の機能は「(STAC9750 / STAC9751) VALUE-LINE TWO-CHANNEL AC97 CODECS」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 STAC9750 |
| 部品説明 (STAC9750 / STAC9751) VALUE-LINE TWO-CHANNEL AC97 CODECS |
| メーカ IDT |
ロゴ |
このページの下部にプレビューとSTAC9750ダウンロード（pdfファイル）リンクがあります。 Total 30 pages |
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www.DataSheet4U.com
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™
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STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
PC AUDIO
LIST OF FIGURES
Figure 1. STAC9750/9751 Block Diagram ...................................................................................................... 6
Figure 2. Cold Reset Timing ......................................................................................................................... 15
Figure 3. Warm Reset Timing ....................................................................................................................... 15
Figure 4. Clocks Timing ................................................................................................................................ 16
Figure 5. Data Setup and Hold Timing ......................................................................................................... 17
Figure 6. Signal Rise and Fall Times Timing ................................................................................................ 17
Figure 7. AC-Link Low Power Mode Timing ................................................................................................. 18
Figure 8. ATE Test Mode Timing .................................................................................................................. 18
Figure 9. STAC9751 Typical Connection Diagram ....................................................................................... 19
Figure 10. AC-Link to its Companion Controller ........................................................................................... 20
Figure 11. AC'97 Standard Bi-directional Audio Frame ................................................................................ 22
Figure 12. AC-Link Audio Output Frame ...................................................................................................... 22
Figure 13. Start of an Audio Output Frame ................................................................................................... 23
Figure 14. STAC9750/9751 Audio Input Frame ........................................................................................... 26
Figure 15. Start of an Audio Input Frame ..................................................................................................... 26
Figure 16. STAC9750/9751 Powerdown Timing ......................................................................................... 29
Figure 17. STAC9750 2-Channel Mixer Functional Diagram .................................................................. 31
Figure 18. STAC9751 2-Channel Mixer Functional Diagram ....................................................................... 32
Figure 19. Example of STAC9750/9751 Powerdown/Powerup Flow ........................................................... 56
Figure 20. STAC9750/9751 Powerdown/Powerup Flow With Analog Still Active ........................................ 57
Figure 21. STAC9750/9751 Pin Description Drawing ................................................................................... 61
Figure 22. Package Drawing - 48-pin LQFP .................................................................................................. 66
Figure 23. Reflow Profile .............................................................................................................................. 67
Figure 24. STAC9750/9751 Split Independent Power Supply Operation Typical Connection Diagram ....... 70
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
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STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
PC AUDIO
isters. The two DACs convert the digital stereo PCM-out content to audio. The MIXER block
combines the PCM_OUT with any analog sources, to drive the LINE_OUT and HP_OUT outputs.
The MONO_OUT delivers either microphone only, or a mono mix of sources from the MIXER. The
stereo variable sample rate ADCs provide record capability for any mix of mono or stereo sources,
and deliver a digital stereo PCM_IN signal back to the AC-Link. The microphone input and mono
input can be recorded simultaneously, thus allowing for an all digital output in support of the digital
ready initiative. All ADCs operate at 18-bit resolution and DACs at 20-bit resolution. For a digital
ready record path, the microphone is connected to the left channel ADC while the mono output of the
stereo mixer is connected to right channel ADC. Make sure the microphone input is not connected to
the stereo mixer when in this mode.
The STAC9750/9751 supports General Purpose Input/Output (GPIO), as well as SPDIF output.
These digital I/O options provide for a number of advanced architectural implementations, with vol-
ume controls and digital mixing capabilities built directly into the CODEC.
The STAC9750/9751 is designed primarily to support stereo (2-speaker) audio. True AC-3 playback
can be achieved for 6-speaker applications by taking advantage of the multi-CODEC option avail-
able in the STAC9750/9751 to support multiple CODECs in an AC'97 architecture. Additionally, the
STAC9750/9751 provides for a stereo enhancement feature, IDT Surround 3D (SS3D). SS3D pro-
vides the listener with several options for improved speaker separation beyond the normal 2/
4-speaker arrangements.
Together with the logic component (controller or advanced core logic chip-set) of AC'97, STAC9750/
9751 can be SoundBlaster® and Windows Sound System® compatible with IDT’s WDM driver for
WIN 98/2K/ME/XP.
SoundBlaster is a registered trademark of Creative Labs.
Windows is a registered trademark of Microsoft Corporation.
1.3.
STAC9750/9751 Block Diagram
AC-link
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET#
Multi-Codec
CID0
CID1
Figure 1. STAC9750/9751 Block Diagram
Power
Management
4 stereo
sources
PCM out DACs
2 mono
sources
Stereo
Mono
Digital
Interface
DAC
DAC
MIXER
HP_OUT
LINE_OUT
Registers
64x16 bits
ADC
ADC
Analog mixing MONO_OUT
and Gain Control
PCM in ADCs
Mic Boost
0,20 or 30 dB
Variable Sample Rate
20-Bit DACs and
18-Bit ADCs
SPDIF
M MIC1
U
X
MIC2
IDT™
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合計 : 30 ページ |
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データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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| 部品番号 | 部品説明 | メーカ |
| STAC9750 | (STAC9750 / STAC9751) VALUE-LINE TWO-CHANNEL AC97 CODECS | IDT |
| STAC9751 | (STAC9750 / STAC9751) VALUE-LINE TWO-CHANNEL AC97 CODECS | IDT |
| STAC9752 | (STAC9752 / STAC9753) TWO-CHANNEL AC97 2.3 CODECS | IDT |
| STAC9752A | (STAC9752A / STAC9753A) AC97 2.3 CODECS | IDT |