參數(shù)資料
型號： HMP9701CN
廠商： INTERSIL CORP
元件分類： 消費(fèi)家電
英文描述： AC’97 Audio Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： TQFP-48
文件頁數(shù)： 2/20頁
文件大?。?/td> 174K
代理商： HMP9701CN
2
Functional Block Diagram
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.
GAIN
0dB/20dB
MONO
VOL
Σ
D/A
A
Σ
D/A
MIC1
MIC2
LINE_IN
CD
VIDEO
AUX
PHONE
PC_BEEP
MONO_OUT
LINE_OUT
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET
G
A
M
G
A
M
G
A
M
G
A
M
G
A
M
G
A
M
GAM
GAM
AC’97
CONTROL/CONFIGURATION
(64 REGISTERS)
HMP9701 AC’97 AUDIO CODEC
STEREO SIGNAL PATH
MONO SIGNAL PATH
RECORD
GAIN
MASTER
VOL
Σ
A/D
Σ
A/D
Σ
A/D
∑
∑
∑
∑
M
S
M
S
R
HMP9701
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