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HMP9701CN Datasheet(PDF) 2 Page - Intersil Corporation |
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HMP9701CN Datasheet(HTML) 2 Page - Intersil Corporation |
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2 / 20 page  2 Functional Block Diagram Functional Description The HMP9701 is a full-duplex stereo audio codec compliant to the AC’97 Codec specification. This component is designed for use in multimedia and business personal computers. The codec includes full duplex stereo converters, a mic pass through ADC, complete on-chip anti-alias filtering, and a 5 channel analog mixer with programmable gain and attenuation. Analog Inputs The HMP9701 has 4 stereo inputs (LINE_IN, CD, VIDEO, and AUX), two microphone level inputs (MIC1 and MIC2), and one mono line level input (PHONE). A multiplexer is provided to independently select the right and left record sources from the analog inputs listed above. In addition, the output stereo mix (LINE_OUT) or its mono equivalent may also be selected as a record source. A gain block is available to amplify the MIC inputs by 20dB to compensate for the difference between line levels and typical condenser microphone levels. Besides being fed to the Record Select Mux, all analog inputs can be mixed (see Analog Mixer) with the stereo out- put from the Playback DACs. Note: all analog inputs except PHONE and PC_BEEP can be output on MONO_OUT. There is a dedicated analog input, PC_BEEP, for the standard “Beep” signal provided on most PC/Compatible computers for power on self test and boot audio status indication. This input is mixed into each channel of the stereo line outputs. Record ADCs The HMP9701 provides 3 Σ∆ ADCs to record one dedicated microphone input and 2 user selectable analog inputs. The user selectable analog inputs are routed to the stereo ADCs via an programmable Input Multiplexer. The multiplexer is programmed to select the 2 record channels via the Record Select register (1Ah). Each of the record channels pass through a programmable gain block before each ADC. The record gain for each chan- nel is set individually and ranges from 0dB to 22.5dB in 1.5dB increments (see Record Gain Registers 1Ch and 1Eh). The gain block can also be used to mute each chan- nel. Note: an additional gain block provides 20dB of gain on the MIC channel if activated (see MIC Volume register 0Eh). The HMP9701 uses oversampling Σ∆ ADCs which only require a single pole passive filter for anti-alias filtering. The filter for the left, right and MIC channels is realized by placing a 1nF capacitor between the AFILT1, AFILT2, and AFILT3 pins and analog ground respectively. Playback DACs The HMP9701 uses oversampling single bit Σ∆ DACs to con- vert the stereo playback sample to an analog line level output. The output of the DACs pass through internal reconstruction filters that do not require any external components. GAIN 0dB/20dB MONO VOL Σ∆ D/A Σ∆ D/A MIC1 MIC2 LINE_IN CD VIDEO AUX PC_BEEP MONO_OUT LINE_OUT SYNC BIT_CLK SDATA_OUT SDATA_IN RESET PHONE G A M G A M G A M G A M G A M G A M GAM GAM AC’97 CONTROL/CONFIGURATION (64 REGISTERS) HMP9701 AC’97 AUDIO CODEC STEREO SIGNAL PATH MONO SIGNAL PATH RECORD GAIN MASTER VOL Σ∆ A/D Σ∆ A/D Σ∆ A/D ∑ ∑ ∑ ∑ HMP9701 |
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Similar Description - HMP9701CN |
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