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HMP9701 PDF даташит

Спецификация HMP9701 изготовлена ​​​​«Intersil Corporation» и имеет функцию, называемую «AC97 Audio Codec».

Детали детали

Номер произв HMP9701
Описание AC97 Audio Codec
Производители Intersil Corporation
логотип Intersil Corporation логотип 

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HMP9701 Даташит, Описание, Даташиты
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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
1
File Number 4287.4









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HMP9701 Даташит, Описание, Даташиты
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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HMP9701 Даташит, Описание, Даташиты
HMP9701
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 analaog volume
rather than digitally attenuating the DAC PCM input to take
advantage of full resolution conversions.
Clocking
The HMP9701 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).
An external CMOS clock may be connected to XTL_OUT
instead of a crystal. If this external clocking option is used,
XTL_IN should be left floating. Please Note: No capacitors
are used on the crystal pins in this mode. For an example
circuit, refer to the Typical Application Schematic.
The HMP9701 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 HMP9701 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.
AC’97
DIGITAL
CONTROLLER
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET
HMP9701
AC’97
AUDIO
CODEC
FIGURE 1. HMP9701 CONNECTION TO AC’97 CONTROLLER
Digital Serial Interface (AC Link)
The HMP9701 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 HMP9701 allocates data slots for
2 PCM playback channels, 2 PCM record channels, codec
control, codec status, and a PCM microphone record chan-
nel. The remaining unused time slots are reserved.
SLOT NO.
SYNC
0 1 2 3 4 5 6 7 8 9 10 11 12
OUTGOING
AUDIO STREAMS
TAG
CMD CMD
ADDR DATA
PCM PCM
LEFT RIGHT RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD
INCOMING
AUDIO STREAMS
TAG
STATUS STATUS
ADDR DATA
PCM
LEFT
PCM
RIGHT RSRVD
MIC
RSRVD RSRVD RSRVD RSRVD RSRVD RSRVD
TAG
PHASE
DATA PHASE
FIGURE 2. AC LINK BIDIRECTIONAL DATA FRAME
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Номер в каталогеОписаниеПроизводители
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