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參數(shù)資料
| 型號： | PCM56U |
| 英文描述： | RJ 45 Jack, LED, Unshielded, Thru Hole, Side Entry, 8P/8C |
| 中文描述： | 串行輸入16位單片數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 94K |
| 代理商： | PCM56U |
8
PCM56
SECOND GENERATION SYSTEMS
One method of avoiding the problems associated with a
higher order analog filter would be to use digital filter
oversampling techniques. Oversampling by a factor of two
would move the sampling frequency (88.2kHz) out to a
point where only a simple low-order phase-linear analog
filter is required after the deglitcher output to remove
unwanted intermodulation products. In a digital compact
disc application, various VLSI chips perform the functions
of error detection/correction, digital filtering, and formatting
of the digital information to provide the clock, latch enable,
and serial input to the PCM56. These VLSI chips are
available from several sources (Sony, Yamaha, Signetics,
etc.) and are specifically optimized for digital audio
applications.
Oversampled circuitry requires a very fast D/A converter
since the sampling frequency is multiplied by a factor of two
or more (for each output channel). A single PCM56 can
provide two-channel oversampling at a 4X rate (176.4kHz/
channel) and still remain well within the settling time
requirements for maintaining specified THD performance.
This would reduce the complexities of the analog filter even
further from that used in 2X oversampling circuitry.
FIGURE 9. A Sample/Hold Amplifier (Deglitcher) is Required at the Digital-to-Analog Output for Both Left and Right Channels.
FIGURE 10. Timing Diagram for the Deglitcher Control Signals.
R
2
2.2k
A
1(1)
C
680pF
C
B
A
Left Channel
Output to LPF
SW
1
MP7512
(Micro Power)
R
4
2.2k
A
2(1)
C
680pF
C
B
A
Right Channel
Output to LPF
SW
2
MP7512
(Micro Power)
R
1
2.2k
R
3
2.2k
NOTE: (1) 1 OPA101AM or 1/4 OPA404KP or 1 OPA606KP or OPA2604.
PCM56
Serial Data
Clock
Latch Enable
Left Channel
Deglitcher Control
Right Channel
Deglitcher Control
A "low" signal on the deglitcher control closes switch "A",
while a "high" signal closes switch "B".
Latch Enable
Right Channel
Serial Data
44.1kHz
Left Channel
Left Channel
Right Channel
Right Channel
Deglitcher Control
Left Channel
Deglitcher Control
t
DELAY
4.5μs max
t = 1.5μs DAC Settling Time
The deglitcher control signals by timing control logic. The fast settling time of the PCM56 makes it possible to
minimize the delay between left and right channels to about 4.5μs, which reduces phase error at the higher audio frequencies.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCM56P-L | Serial Input 16-Bit Monolithic DIGITAL-TO-ANALOG CONVERTER |
| PCM56P-J | Serial Input 16-Bit Monolithic DIGITAL-TO-ANALOG CONVERTER |
| PCM61J-P | Serial Input 18-Bit Monolithic Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM61K | Serial Input 18-Bit Monolithic Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM61P | Serial Input 18-Bit Monolithic Audio DIGITAL-TO-ANALOG CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM56U/1K | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Series Input 16-Bit Monolithic DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM56U/1KG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Series Input 16-Bit Monolithic DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM56UG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Series Input 16-Bit Monolithic DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM-57 | 功能描述:電線鑒定 Pre-Printed WM Card, Vinyl Cloth, .22" W RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長度:1 in |
| PCM-572 | 制造商:Panduit Corp 功能描述: |
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