Audio Codec. HMP9701A Datasheet

HMP9701A Codec. Datasheet pdf. Equivalent

Part HMP9701A
Description AC97 Audio Codec
Feature Semiconductor November 1998 T UCT DUC ROD TE PRO 747 P E T 7 TITU OLE 442OBS LE SUBS s 1-800- m s..
Manufacture Intersil Corporation
Datasheet
Download HMP9701A Datasheet

Semiconductor November 1998 T UCT DUC ROD TE PRO 747 P E T HMP9701A Datasheet
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HMP9701A
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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(NARC859d7BAudio 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,oPllCers98, 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
seven
digital
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
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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



HMP9701A
Functional Block Diagram
HMP9701A
HMP9701A AC’97 AUDIO CODEC
MIC1
MIC2
LINE_IN
CD
VIDEO
AUX
PHONE
GAIN
0dB / 20dB
MONO_OUT
MONO
VOL
LINE_OUT
PC_BEEP
MASTER
VOL
GAM
G
A
M
GGGGG
AAAAA
MMMMM
RECORD
GAIN
Σ∆ A/D
Σ∆ A/D
Σ∆ A/D
AC’97
CONTROL/CONFIGURATION
(64 REGISTERS)
GAM
Σ∆ D/A
Σ∆ D/A
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET
STEREO SIGNAL PATH
MONO SIGNAL PATH
Functional Description
The HMP9701A 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 HMP9701A 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 HMP9701A provides 3 Σ∆ ADCs to record one dedi-
cated 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 multi-
plexer 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 HMP9701A 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 HMP9701A uses oversampling single bit Σ∆ DACs to
convert the stereo playback sample to an analog line level
output. The output of the DACs pass through internal recon-
struction filters that do not require any external components.
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