 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HMP9701ACN Datasheet(PDF) 3 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
HMP9701ACN Datasheet(HTML) 3 Page - Intersil Corporation |
|
|
3 / 20 page  3 Analog Mixer The Analog Mixer generates two outputs, one stereo and one mono. The stereo output is used to drive LINE_OUT and is composed of a stereo mix of all analog input sources and the audio output from the DACs. The mono output drives MONO_OUT, and it is user selectable as either MIC only or a mono mix of all the analog and PCM sources except the PHONE and PC_BEEP inputs. The inputs to the analog mixer pass through gain/attenu- ate/mute (GAM) blocks. Each gain block provides volume control from -34.5dB to +12dB in 1.5dB increments (see Input Volume Registers 0Ch - 18h). Additionally, the GAM blocks can be used to mute individual mixer inputs. An addi- tional gain of 20dB is provided for the selected MIC input. Note: for best SNR performance, the GAM block for the DAC output should be used to control PCM analog volume rather than digitally attenuating the DAC PCM input to take advan- tage of full resolution conversions. Clocking The HMP9701A derives it’s internal clock from an externally attached 24.576MHz crystal. The crystal and 2 capacitors are attached to the XTL_IN and XTL_OUT pins, and it should be fundamental-mode/parallel resonant with a load capacitor as specified by the crystal manufacturer (typically 12-30pF). For an example circuit, refer to the Typical Appli- cation Schematic. An external CMOS clock may be connected to XTL_IN instead of a crystal. If this external clocking option is used, XTL_OUT should be left floating. Please Note: No capaci- tors are used on the crystal pins in this mode. The HMP9701A divides the clock source by 2 to derive the BIT_CLK provided to the companion digital controller. The digital controller should divide the provided BIT_CLK by 256 to generate the 48kHz SYNC signal used to define the audio frame transmitted over the serial digital interface (See Serial Digital Interface Section) Serial Digital Interface Audio Data Format The HMP9701A supports 16-bit 2’s complement linear PCM data for record and playback. The 16-bit 2’s complement for- mat (also called 16-bit signed format) is the standard method of representing 16-bit digital audio. This format gives 96dB theoretical dynamic range and is the standard for compact disk audio players. This format uses the value -32768 (8000h) to represent minimum analog amplitude while 32767 (7FFFh) represents maximum analog amplitude. Digital Serial Interface (AC Link) The HMP9701A is linked to an AC’97 digital controller via a 5 pin digital serial interface as shown in Figure 1. This inter- face, the AC-link, supports bidirectional, fixed rate, serial data streams. The data transfers are based on a time divi- sion multiplexed (TDM) protocol that provides for multiple input and output audio streams together with control and sta- tus data. The AC-link protocol is based on incoming and out- going audio frames which are each divided into 12 data slots as shown in Figure 2. The HMP9701A allocates data slots for 2 PCM playback channels, 2 PCM record channels, codec control, codec status, and a PCM microphone record channel. The remaining unused time slots are reserved. SYNC BIT_CLK SDATA_OUT SDATA_IN RESET HMP9701A AC’97 AUDIO CODEC FIGURE 1. HMP9701A CONNECTION TO AC’97 CONTROLLER AC’97 DIGITAL CONTROLLER PCM LEFT RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD MIC RSRVD PCM RIGHT STATUS DATA TAG STATUS ADDR INCOMING AUDIO STREAMS PCM LEFT RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD PCM RIGHT CMD DATA TAG CMD ADDR OUTGOING AUDIO STREAMS SYNC SLOT NO. 0123456789 10 11 12 TAG PHASE DATA PHASE FIGURE 2. AC LINK BIDIRECTIONAL DATA FRAME HMP9701A |
Similar Part No. - HMP9701ACN |
|
Similar Description - HMP9701ACN |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
