參數(shù)資料
型號(hào)： IDT821054PQFG
廠商： IDT, Integrated Device Technology Inc
文件頁(yè)數(shù)： 8/45頁(yè)
文件大小： 0K
描述： IC PCM CODEC QUAD MPI 64-PQFP
標(biāo)準(zhǔn)包裝： 84
類(lèi)型： PCM 編解碼器/濾波器
數(shù)據(jù)接口： PCM 音頻接口
ADC / DAC 數(shù)量： 4 / 4
三角積分調(diào)變： 無(wú)
電壓 - 電源，模擬： 4.75 V ~ 5.25 V
電壓 - 電源，數(shù)字： 4.75 V ~ 5.25 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 64-QFP
供應(yīng)商設(shè)備封裝： 64-PQFP（14x14）
包裝： 管件
其它名稱(chēng)： 800-2516-5
821054PQFG
IDT821054PQFG-ND
16
IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE
INDUSTRIAL TEMPERATURE RANGE
the linear PCM data will be sent to the level meter and the metering
result will be output to GREG18 and GREG19. With this result, the
signal level can be calculated.
For A-law compressed PCM code or linear PCM code, the signal
level can be calculated by the following formula:
For -law compressed PCM code, the signal level can be calculated
by the following formula:
LMResult:
the value in the level meter result registers (GREG18
& GREG19);
LMCountnumber:the count number of the level meter (set in GREG20).
If the L/C bit is ‘0’, it means that message mode is selected. In this
mode, the compressed PCM data will be output to GREG19
transparently without metering.
Refer to the Application Note for further details on the level meter.
2.11
CHANNEL POWER DOWN/STANDBY MODE
Each individual channel of the IDT821054 can be powered down
independently by setting the PD bit in LREG9 to ‘1’. If one channel is
powered down and enters the standby mode, the PCM data transfer and
the D/A, A/D converters of this channel will be disabled. In this way, the
power consumption of the device can be reduced.
When the IDT821054 is powered up or reset, all four channels will be
powered down. All circuits that contain programmed information retain
their data after power down. The microprocessor interface is always
active so that new commands can be received and executed.
2.12
POWER DOWN/SUSPEND MODE
A suspend mode is provided for the whole chip to save power. The
suspend mode saves much more power consumption than the standby
mode. In this mode, the PLL block is turned off and the DSP operation is
disabled. Only global and local commands can be executed, the RAM
operation is disabled as the internal clock has been turned off. The PLL
block is powered down by setting the PPD bit in GREG22 to ‘1’. Once
the PLL and all four channels are powered down, the IDT821054 will
enter the suspend mode.
A dbm0
()
20
LMResult 2
5
π
×
LMCountnumber 28192
×
--------------------------------------------------------------
log
×
3.14
+
=
A dbm0
()
20
LMResult 2
5
π
×
LMCountnumber 28192
×
--------------------------------------------------------------
log
×
3.17
+
=
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