參數(shù)資料
型號(hào)： IDT821068
廠商： Integrated Device Technology, Inc.
元件分類： Codec
英文描述： OCTAL PROGRAMMABLE PCM CODEC
中文描述： 八路可編程PCM編解碼器
文件頁(yè)數(shù)： 18/45頁(yè)
文件大小： 589K
代理商： IDT821068
INDUSTRIAL TEMPERATURE RANGE
IDT821068 OCTAL PROGRAMMABLE PCM CODEC
18
Figure 12. Teletax Signal
rising
time
falling time
pause
time
output to LMRL and LMRH. When L/C bit is 0, compressed PCM will
be output transparently to LMRH.
The calculation and method of level metering will be described in
Application Note.
TELETAX
The teletax signal is used to sum the telephone fee according to the
calling time and tariff. The frequency of teletax signal carrier can be
selected as 12 kHz or 16 kHz (± 50 Hz) by Global Command 19,
while the amplitude of the teletax signal on specific channel can be
programmed by Teletax Gain Setting bits (TGS[7:0]) in Local Com-
mand 3. When a ‘1’ appears on Teletax Ramp Start bit (RS) of Local
Command 10, the teletax signal will be output from the VOUT pin on
the corresponding channel with a 16 ms ± 10% rising time. This
teletax signal will last until a ‘0’ on the RS bit for the same channel. It
has a falling time of 16 ms ± 10%, as shown in Figure 12.
CHANNEL POWER DOWN/STANDBY MODE
Each individual channel of IDT821068 can be powered down
independently by Local Command 10. When the channel is powered
down (enters into standby mode), PCM data transmission and
reception, D/A and A/D are disabled. In this way, power consumption
of the device can be reduced. When IDT821068 is powered up or
reset, all eight channels will be powered down. All circuits that contain
programmed information retain their data when powered down. In MPI
operation, MPI (Microprocessor Interface) is always active so that new
command could be received and executed. In GCI operation, the
monitor channel of any time slot is always on so that new command
could be accepted at any time.
POWER DOWN PLL/SUSPEND MODE
A suspend mode is offered to the whole chip to save power. In this
mode, the PLL block is turned off and DSP operation is disabled. This
mode saves much more power consumption than standby mode. In
this mode, only Global Command and Local Command can be
executed. RAM operation is disabled as internal clock has been
turned off. The PLL blocks can be powered down by Global
Command 25. Suspend mode can be entered by powering down PLL
and all channels.
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