Audio Codec. HMP9701 Datasheet

HMP9701 Codec. Datasheet pdf. Equivalent

Part HMP9701
Description AC97 Audio Codec
Feature Semiconductor November 1998 T CT DUC PRODU O R TE P TITUTE 42-7747 OLE 4 OBS LE SUBS s 1-800- m o .
Manufacture Intersil Corporation
Datasheet
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HMP9701
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HMP9701
AC’97 Audio Codec
Features
Description
• Fully Compatible with the Audio Codec ‘97 Standard
• High Fidelity 16-Bit Σ∆ Converters
- DAC SNR > 80dB
- ADC SNR > 80dB
• Additional A/D for Microphone Pass-Through
• AC Link Serial Interface Compatible with AC’97 Digital
Controllers
• Fixed 48kHz Sampling Rate
• 6 Channel Input Mixer
• Programmable Powerdown Modes
• 48 Lead TQFP Package
• Single +5V Supply
The HMP9701 is the next generation PC based audio codec
solution. The HMP9701 is fully compatible to the new AC’97
standard and, as such, interfaces to any AC’97 compliant digital
controller. The HMP9701 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
architecture, the HMP9701 helps pave the way for PC’97 com-
pliant desktop, portable and entertainment PCs with a cost
effective high-quality audio solution.
As the analog front end of the AC’97 chipset, the HMP9701
accepts line level audio inputs from seven different sources and
converts the analog audio to 16-bit digital streams of either ste-
reo or mono data. The 48 Kss data is transmitted to the control-
ler via the AC’97 standard five wire interface. The controller
sends digital audio data to the HMP9701 to be converted to
analog stereo or monaural line output using two DACs.
Applications
• Multimedia PC Applications
- Desk Top PCs
- Notebook PCs
- Sound Cards
- Motherboards
• Video Conferencing
• Speaker Phones
Table of Contents
Page
Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Serial Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
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
implementation.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
HMP9701CN
0 to 70 48 Ld TQFP
PKG. NO.
Q48.7x7A
HMP9701EVAL2 PCI Bus Evaluation Board (Includes codec)
TQFP is also known as PQFP and MQFP.
Control Register Description . . . . . . . . . . . . . . . . . . . . . . . . 8
Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AC and DC Electrical Specifications . . . . . . . . . . . . . . . . . 13
Typical Performance Curves
ADC/DAC Frequency Responses . . . . . . . . . . . . . . . . . 17
AC Timing Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1998
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File Number 4287.4



HMP9701
Functional Block Diagram
HMP9701
HMP9701 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 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.
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