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參數(shù)資料
| 型號(hào)： | PCM1712U |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Stereo Audio Digital-To-Analog Converter(立體聲音頻D\A轉(zhuǎn)換器) |
| 中文描述： | 立體聲音頻數(shù)字模擬轉(zhuǎn)換器（立體聲音頻?\\阿轉(zhuǎn)換器） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 160K |
| 代理商： | PCM1712U |
10
PCM1712
SERIAL MODE
(MODE = H)
PARALLEL MODE
(MODE = L)
FUNCTION
Input Data Format Selection
Input LRCI Polarity Selection
De-emphasis Control
Mute
Attenuation
Double-Speed Dubbing
0
0
0
0
0
0
X (Normal Mode Fixed)
X
0
0
X
0
NOTE: 0: Selectable, X: Not Selectable.
FUNCTIONAL DESCRIPTION
PCM1712 has several built-in functions including digital
attenuation, digital de-emphasis and soft mute. These func-
tions are software controlled. PCM1712 can be operated in
two different modes,
Serial
or
Parallel
. Serial Mode is a
three-wire interface using pin 26 (MD), pin 27 (MC), and
pin 28 (ML). Data on these pins are used to control de-
emphasis modes, mute, double-speed dubbing, input resolu-
tion and input formats. PCM1712 can also be operated in
parallel mode, where static control signals are used on pins
26 (DM1), pin 27 (DM2), and pin 28 (DSD). Operation of
both of these modes are covered in detail in the next
sections.
CAUTION:
Mode control signals operate on level triggered
logic. The minimum timing conditions detailed in Figures 4
and 5 MUST be observed.
MODE = H
Serial Mode
MODE = L
Parallel Mode
TABLE III. Serial and Parallel Mode are Selectable by
MODE Pin (Pin 24).
MODE CONTROL: SERIAL/PARALLEL SELECTION
MODE CONTROL: SELECTABLE FUNCTIONS
DIGITAL ATTENUATION
One of the functions which can be implemented through use
of the serial mode control is attenuation. This function
allows the user to control the level of the output, indepen-
dent of the input level set by the actual input data supplied
to the DAC.
Referring to Figure 5, when the first data bit (B0) on MD
(pin 26) is low, the attenuation function is enabled. The next
seven bits (B1 - B6) define a binary value, ATT_DATA, that
indicates the desired level of attenuation. The attenuation
level is given by:
Level = 20log
10
(1 - ATT_DATA/127) dB
When all 7 bits of the ATT_DATA word are high
(ATT_DATA = 127), attenuation is infinite and the output
of PCM1712 will be zero.
NAME
PIN
FUNCTION
MC
ML
MD
27
28
26
Clock for Strobing in Data
Latches Data into the Registers
8-bit Data Word Defining Operation
DSD = H
Normal Mode
DSD = L
Double Speed Dubbing Mode
PARALLEL-MODE: DOUBLE-SPEED DUBBING
CONTROL (PIN 24 [MODE] = L)
TABLE VI. DSD (Pin 28).
In the parallel mode, double-speed dubbing can be enabled
by holding pin 28 (DSD) at logic “l(fā)ow”.
SERIAL MODE CONTROL
In order to use all of PCM1712’s functionality, the
serial
mode control
should be used. PCM1712 must be addressed
three separate times to set all of the various registers and
flags that control these functions.
Table VII together with Figure 6 details the control of the
PCM1712 in the serial mode. Internal latches are used to
hold this serial data until the PCM1712 is enabled to use the
data. The serial mode is used by applying clocked data to the
following pins:
TABLE IV. Selectable Functions in Serial Mode and
Parallel Mode.
Table IV indicates which functions are selectable within the
user’s chosen mode. All of the functions shown are select-
able within the serial mode, but only de-emphasis control,
mute and double-speed dubbing may be selected when using
PCM1712 in the parallel mode.
PARALLEL-MODE: DE-EMPHASIS CONTROL
(PIN 24 [MODE] = L)
DM1 (Pin 26)
DM2 (Pin 27)
De-emphasis
L
H
L
H
L
L
H
H
OFF
32kHz
48kHz
44.1kHz
TABLE V. De-emphasis (Pins 26 and 27).
In the parallel mode, de-emphasis conditions are controlled
by the logic levels on pin 26 (DM1) and pin 27 (DM2). For
PCM1712, de-emphasis can operate at 32kHz, 44.1kHz,
48kHz, or disabled.
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