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參數(shù)資料
| 型號： | IDT821054PQF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 編解碼器 |
| 英文描述： | QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE |
| 中文描述： | A/MU-LAW, PCM CODEC, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 16/45頁 |
| 文件大?。?/td> | 506K |
| 代理商： | IDT821054PQF |
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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
μ
-law compressed PCM code, the signal level can be calculated
by the following formula:
LM
Result
:
the value in the level meter result registers (GREG18
& GREG19);
LM
Countnumber
: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 dbm
0
(
)
20
LM
2
5
×
LM
Countnumber
2
8192
×
--------------------------------------------------------------
log
×
3.14
+
=
A dbm
0
(
)
20
LM
2
5
×
LM
Countnumber
2
8192
×
--------------------------------------------------------------
log
×
3.17
+
=
相關PDF資料 |
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|---|---|
| IDT821064 | QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821064PQF | QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821068 | OCTAL PROGRAMMABLE PCM CODEC |
| IDT821068PX | OCTAL PROGRAMMABLE PCM CODEC |
| IDT821621 | LONG HAUL SLIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IDT821054PQFG | 功能描述:IC PCM CODEC QUAD MPI 64-PQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| IDT821064 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821064PQF | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821068 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:OCTAL PROGRAMMABLE PCM CODEC |
| IDT821068PX | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:OCTAL PROGRAMMABLE PCM CODEC |
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