| 简介 |
IDT公司的92HD75B是四路高清晰(HD)低功耗音频CODEC,具有Intel 高清音频接口. 92HD75B提供立体声24位分辨率,取样速率可高达192kHz,能为笔记本电脑和商用台式计算机提供高质量HD音频.本文介绍了92HD75B的主要性能,方框图,系统应用框图,所支持的软件以及92HD75B参考设计的详细电路图.
The 92HD75B is a high fidelity, 4-channel audio codec compatible with the Intel High Definition (HD) Audio Interface. The 92HD75B codecs provide high quality, HD Audio capability to notebook and cost sensitive desktop PC applications.
The higher performance and quality of IDT’s audio solutions brings consumer electronics level performance to notebook and desktop PCs. 92HD75B is designed to meet or exceed premium logo requirements for Microsoft’s Windows Logo Program (WLP) 3.09.
The 92HD75B provides stereo 24-bit, full duplex resolution supporting sample rates up to 192kHz by the DAC and ADC. The 92HD75B SPDIF outputs support sample rates of 192kHz, 96kHz, 88.2kHz, 48kHz, and 44.1kHz. Additional sample rates are supported by the driver software.
The 92HD75B supports a wide range of mobile and desktop 4 channel configurations. The 2 independent SPDIF output interfaces provide connectivity to Consumer Electronic equipment like Dolby Digital decoders, powered speakers, mini disk drives or to a home entertainment system. Simultaneous WLP compliant HDMI and SPDIF output is possible. All analog input pairs support LINE_IN and MIC.
MIC inputs can be programmed with 0/10/20/30dB boost. (40dB boost is available using the IDT driver.) For more advanced configurations, the 92HD75B has up to 8 General Purpose I/O (GPIO).
The port presence detect capabilities allow the codecs to detect when audio devices are connected to the codec. The fully parametric IDT SoftEQ can be initiated or disabled upon headphone jack removal and insertion for protection of notebook speakers.
The 92HD75B operates with a 3.3V digital supply and either 3.3V, 4V, 4.75V or 5V analog supply. It can also work with 1.5V and 3.3V HDA signaling as an orderable option with 32 pad packages. Available in a 32-pad QFN Environmental (ROHS) package.
主要特性:
4 Channels (2 stereo DACs and 2 stereo ADCs) with 24-bit resolution
Supports full-duplex stereo audio and simultaneous VoIP
Provides a mono output
Microsoft WLP 3 premium logo compliant, as defined in WLP 3.09
Optimized and flexible power management with pop/click mitigation
Support for 1.5V and 3.3V HDA signaling
Digital microphone inputs (mono or stereo)
High performance analog mixer
2 adjustable VREF Out pins for microphone bias
5 analog ports with port presence detect
Two-pin volume up/down control
Digital and Analog PC Beep to all outputs
Integrated headphone amp
Sample rates up to 192kHz
+3.3 V, +4.75 V and +5 V analog power supply options
3.3V digital power supply options
32-pad QFN RoHS packages
软件支持:
Intuitive graphical user interface that allows configurability and preference settings
SKPI (Kernel Processing Interface)
Enables plug-ins that can operate globally on all audio streams of the system
12 band fully parametric equalizer (SKPI plug-in)
Constant, system-level effects tuned to optimize a particular platform can be combined with
user-mode “presets” tailored for specific acoustical environments and applications
System-level effects automatically disabled when external audio connections made
Dynamics Processing (SKPI plug-in)
Enables improved voice articulation
Compressor/limiter allows higher average noise level without resonances
IDT Vista APO wrapper
Enables multiple APOs to be used with the IDT Driver
Microphone Beam Forming, Acoustic Echo Cancellation, and Noise Suppression
Dynamic Stream Switching
Improved multi-streaming user experience with less support calls
Dolby PC Entertainment Experience Logo Program
Dolby Home Theater (HT)
Dolby Sound Room (SR)
Dolby Technologies
Dolby Headphone, Dolby Virtual Speaker
Dolby ProLogic II, Dolby ProLogic IIx
Dolby Digital Live (DDL)
Maxx Player from Waves
WOWTM and Tru SurroundTM from SRS
图1. 92HD75B方框图
图2. 92HD75B 系统方框图
图3.92HD75B 5端口32点功能方框图
图4. 92HD75B参考设计电路图(1)
图5. 92HD75B参考设计电路图(2)
图6. 92HD75B参考设计电路图(3)
图7. 92HD75B参考设计电路图(4)
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来源：IDT |
