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參數資料
| 型號： | PCM1794ADBR |
| 英文描述： | 24-bit,192-khz sampling,advanced segment, audio stereo digital-to-analog converter |
| 中文描述： | 24位,192 - kHz的采樣，先進的部分，立體聲音頻數字模擬轉換器 |
| 文件頁數： | 24/30頁 |
| 文件大小： | 301K |
| 代理商： | PCM1794ADBR |
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SLES117A – AUGUST 2004 – REVISED NOVEMBER 2006
www.ti.com
24
DATA
t(BCH)
50% of VDD
BCK
WDCK
t(BCL)
t(LB)
t(BCY)
t(DS)
t(DH)
50% of VDD
50% of VDD
t(BL)
PARAMETER
MIN
20
MAX
UNITS
ns
t(BCY)
t(BCL)
t(BCH)
t(BL)
t(LB)
t(DS)
t(DH)
BCK pulse cycle time
BCK pulse duration, LOW
7
ns
BCK pulse duration, HIGH
7
ns
BCK rising edge to WDCK falling edge
5
ns
WDCK falling edge to BCK rising edge
5
ns
DATA setup time
5
ns
DATA hold time
5
ns
Figure 29. Audio Interface Timing for External Digital Filter (Internal DF Bypass Mode) Application
THEORY OF OPERATION
Analog Output
Digital Input
24 Bits
8 fS
MSB
and
Lower 18 Bits
Upper
6 Bits
ICOB
Decoder
3rd-Order
5-Level
Sigma-Delta
Advanced
DWA
Current
Segment
DAC
0–4
Level
0–62
Level
0–66
Figure 30. Advanced Segment DAC
The PCM1794A uses TI’s advanced segment DAC architecture to achieve excellent dynamic performance and
improved tolerance to clock jitter. The PCM1794A provides balanced current outputs.
Digital input data via the digital filter is separated into 6 upper bits and 18 lower bits. The 6 upper bits are converted
to inverted complementary offset binary (ICOB) code. The lower 18 bits, associated with the MSB, are processed
by a five-level third-order delta-sigma modulator operated at 64 f
S
by default. The 1 level of the modulator is equivalent
to the 1 LSB of the ICOB code converter. The data groups processed in the ICOB converter and third-order
delta-sigma modulator are summed together to create an up-to-66-level digital code, and then processed by
data-weighted averaging (DWA) to reduce the noise produced by element mismatch. The data of up to 66 levels from
the DWA is converted to an analog output in the differential-current segment section.
This architecture has overcome the various drawbacks of conventional multibit processing and also achieves
excellent dynamic performance.
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| PCM1794ADBG4 | 24-bit,192-khz sampling,advanced segment, audio stereo digital-to-analog converter |
| PCM1796DB | 24BIT 192 KHZ SAMPLING ADVANCED SEGMENT AUDIO STEREO DIGITAL TO ANALOG CONVERTER |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM1794ADBRG4 | 功能描述:音頻數/模轉換器 IC 24-Bit 192 kHz Stereo Audio DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1794AQDBRQ1 | 功能描述:DAC, Audio 24 bit 192k I2S, PCM 28-SSOP 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:DAC，音頻 分辨率（位）:24 b 采樣率（每秒）:192k 數據接口:I2S，PCM 電壓源:模擬和數字 電壓 - 電源:3 V ~ 3.6 V，5V 工作溫度:-25°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商器件封裝:28-SSOP 標準包裝:1 |
| PCM1794DB | 功能描述:音頻數/模轉換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1794DB | 制造商:Texas Instruments 功能描述:24BIT AUDIO DAC SMD 1794 SSOP28 |
| PCM1794DBG4 | 功能描述:音頻數/模轉換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
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