HMP9701A Datasheet PDF - Intersil Corporation
| Part Number | HMP9701A | |
| Description | AC97 Audio Codec | |
| Manufacturers | Intersil Corporation | |
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HMP9701A
AC’97 Audio Codec
Features
Description
• Compliant with the Audio Codec ‘97 Standard
The HMP9701A is the next generation PC based audio codec
•
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Converters
/S-ubAjDecCtS(NARC8’59d7BAudio Codec)
•/AAudtdhiotiron()al A/D for Microphone Pass-Through
solution. The HMP9701A is compliant to the new AC’97 stan-
dard and, as such, interfaces to any AC’97 compliant digital
controller. The HMP9701A offers the designer a solution to sat-
isfy the demand for flexibility and improved High Fidelity sound
in a PC environment. As part of the AC’97 PC audio standard
/Keywords (Harris Semiconductor, Audio Codecs, PCarchitecture, the HMP9701A helps pave the way for PC’97
• AC Link Serial Interface Compatible with AC’97 Digital
AuCdoinotr,oPllCer’s98, PC98, PC 98, PC’99, PC 99, PC99,
•THFiDxe,dP4C8kIHAzuSdaimo,pAlinCg9R7a,teAC’97, AC 97, AC’98, AC
AC98, SNR, AC Link, PC’97, PC 97, PC97, GAM
compliant desktop, portable and entertainment
e9f8fe,ctive high-quality audio solution.
As the analog front end of the AC’97 chipset,
PCs with a cost
the HMP9701A
•PC6ICShoanunnedl,InTpouttaMl Hixearrmonic
Distortion,
Signal
to
Noacisocecneveprtstslitnhee
level audio inputs from
analog audio to 16-bit
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different
streams
sources
of either
and
ste-
•RaPtrioog,rRamecmoarbdleGPaoiwnerdown Modes
reo or mono data. The 48 kss data is transmitted to the control-
•) 48 Lead TQFP Package
•/CSrienagtloer+(5)V Supply
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Applications
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- Notebook PCs
- PCI Sound Cards
ler via the AC’97 standard five wire interface. The controller
sends digital audio data to the HMP9701A to be converted to
analog stereo or monaural line output using two DACs.
We include an additional ADC to be used for Acoustic Echo
Canceling needed for video conferencing applications. This
ADC has a dedicated microphone input. It has the same high
quality performance as the stereo ADCs. The small 48 lead
TQFP (Thin 1.5mm and 7mm x 7mm footprint Quad Flat Pack-
age) makes it easy to locate the analog codec close to the ana-
log sources. Thus, reducing noise and lowering the cost of
- Motherboards
implementation.
• Video Conferencing
• Speaker Phones
Table of Contents
Page
Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
HMP9701ACN
0 to 70 48 Ld TQFP†
PKG. NO.
Q48.7x7A
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 HMP9701EVAL2 PCI Bus Evaluation Board (Includes codec)
Serial Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 † TQFP is also known as PQFP and MQFP.
Control Register Description . . . . . . . . . . . . . . . . . . . . . . . . 8
Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AC and DC Electrical Specifications . . . . . . . . . . . . . . . . . 13
ADC/DAC Filter Response Curves . . . . . . . . . . . . . . . . . . 17
AC Timing Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1998
1
File Number 4473.1
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HMP9701A
TABLE 1. BIT MAP FOR SLOT 1: CONTROL ADDRESS
BITS DESCRIPTION
COMMENT
19 Read/Write
1 = Read, 0 = Write
18:12 Control Register Identifies the Target Control Register
Index
11:0 Reserved
Set to “0”
Audio Output Slot 2: Control Data
This Slot is used to deliver the 16-bit control data if the cur-
rent control register access is a write operation (Bit 19 of Slot
1 is set to “0”). The bit map for Slot 2 is given in Table 2.
samples are returned in slots 3, 4 and 6 as shown in
Figure 2. As before, the tag slot, Slot 0, is a special reserved
time slot containing 16 bits that tell the AC-link interface cir-
cuitry the validity of the following data slots.
The HMP9701A starts a new audio input frame when SYNC
makes a low to high transition and is sampled low by the falling
edge of BIT_CLK as shown in Figures 5 and 6. On the next ris-
ing edge of BIT_CLK, the HMP9701A drives SDATA_IN with
the first bit of slot 0 (Codec Ready bit). The HMP9701A drives
the remaining audio frame bits out on SDATA_IN with each ris-
ing edge of BIT_CLK. Note: SYNC must be synchronous to
BIT_CLK.
TABLE 2. BIT MAP FOR SLOT 2: CONTROL DATA
BITS DESCRIPTION
COMMENT
19:4 Control Register Set to “0” if Read operation
Write Data
3:0 Reserved
Set to “0”
Audio Output Slot 3: PCM Playback Left Channel
This time slot contains the audio sample that will be input to
the left channel DAC. The HMP9701A DAC resolution is 17
bits. All audio samples of 17 or less bits should be MSB jus-
tified within the 20-bit frame, and the trailing bits should be
set to “0”. Audio samples greater than 17 bits will be rounded
to 17 bits.
TABLE 3. BIT MAP FOR SLOT 3: PCM PLAYBACK LEFT
CHANNEL
BITS DESCRIPTION
COMMENT
19:0 PCM Audio
Sample for Left
Channel
Set unused bit positions to “0”
Audio Output Slot 4: PCM Playback Right Channel
This time slot contains the audio sample that will be input to
the right channel DAC. The DAC’s resolution is 17 bits. All
audio samples of 17 or less bits should be MSB justified
within the 20-bit frame, and the trailing bits should be set to
“0”. Audio samples greater than 17 bits will be rounded to 17
bits.
TABLE 4. BIT MAP FOR SLOT 4: PCM PLAYBACK RIGHT
CHANNEL
BITS DESCRIPTION
COMMENT
19:0 PCM Audio
Set unused bit positions to “0”
Sample for Right
Channel
HMP9701A SAMPLES
SYNC ASSERTION
HMP9701A OUTPUTS
FIRST BIT OF AUDIO INPUT FRAME
SYNC
BIT_CLK
SDATA_IN
CODEC
READY
SLOT 1
SLOT 2
PREVIOUS AUDIO FRAME
FIGURE 5. START OF AUDIO INPUT FRAME
The first bit of an input audio frame (Slot 0, bit 15) indicates
whether the HMP970’s AC Link is functional. If the “Codec
Ready” bit is a 0, the HMP9701A is not ready for normal
operation. If the “Codec Ready” bit is “1”, the HMP9701A is
ready to perform control and status register transfers. At this
point, it is the responsibility of the digital controller to exam-
ine the Powerdown Control/Status register (see Control Reg-
ister Section) to determine the operational state of the codec
subsections. The 12 bits following the “Codec Ready” Bit in
Slot 0 identify which of the 12 time slots contain valid data.
The HMP9701A outputs each time slots data word MSB first
on SDATA_IN. All non-valid bit positions (for active or inac-
tive time slots) are stuffed with 0’s by the HMP9701A.
Input Audio Slot 1: Status Address
This slot echoes the index of the control register whose con-
tents are returned in slot 2. The data in this register is the
result of a control register read operation initiated by an Out-
put Audio Frame transfer.
TABLE 5. BIT MAP FOR SLOT 1: STATUS ADDRESS
BITS DESCRIPTION
COMMENT
Audio Output Slots 5-12: Reserved
Audio output slots 5-12 are reserved for future use and
should be set to “0” for proper operation.
AC Link Input Frame (SDATA_IN)
The audio input frame contains captured audio samples and
codec status for output onto the AC-Link. The codec status
is transmitted in slots 1 and 2, and the 16-bit captured audio
19 Reserved
Stuffed with 0
18:12 Control Register Echo of Control Register Index for
Index
which data is being returned
11:0 Reserved
Stuffed with 0’s
5
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