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參數資料
| 型號： | PCM1717E |
| 英文描述： | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 立體聲音頻數字模擬轉換器 |
| 文件頁數： | 6/14頁 |
| 文件大小： | 126K |
| 代理商： | PCM1717E |
6
PCM1717
SYSTEM CLOCK
The system clock for PCM1717 must be either 256f
S
or
384f
S
, where f
S
is the audio sampling frequency (typically
32kHz, 44.1kHz, or 48kHz). The system clock is used to
operate the digital filter and the modulator.
The system clock can be either a crystal oscillator placed
between XTI (pin 1) and XTO (pin 20), or an external clock
input to XTI. If an external system clock is used, XTO is
open (floating). Figure 1 illustrates the typical system clock
connections.
PCM1717 has a system clock detection circuit which auto-
matically senses if the system clock is operating at 256f
S
or
384f
S
. The system clock should be synchronized with LRCIN
(pin 4) clock. LRCIN (left-right clock) operates at the
sampling frequency fs. In the event these clocks are not
synchronized, PCM1717 can compensate for the phase dif-
ference internally. If the phase difference between left-right
and system clocks is greater than 6 bit clocks (BCKIN), the
synchronization is performed internally. While the synchro-
nization is processing, the analog output is forced to a DC
level at bipolar zero. The synchronization typically occurs in
less than 1 cycle of LRCIN.
DATA INTERFACE FORMATS
Digital audio data is interfaced to PCM1717 on pins 4, 5,
and 6—LRCIN (left-right clock), DIN (data input) and
BCKIN (bit clock). PCM1717 can accept both normal and
I
2
S data formats. Normal data format is MSB first, two’s
complement, right-justified. I
2
S data is compatible with
Philips serial data protocol. In the I
2
S format, the data is 16-
or 18-bit, selectable by bit 0 on Register 3 (Software Control
Mode). In the Hardware Mode, PCM1717 can only function
with 16-bit normal data. Figures 5 through 9 illustrate timing
and input formats.
t
XTIH
t
XTIL
1/256f
S
or 1/384f
S
64% OF V
DD
28% OF V
DD
External System Clock High
External System Clock Low
t
XTIH
t
XTIL
10ns (min)
10ns (min)
FIGURE 2. External Clock Timing Requirements.
FIGURE 1. Internal Clock Circuit Diagram and Oscillator Connection.
C
1
C
2
C
1
, C
2
= 10 to 20pF
Internal System Clock
XTI
X’tal
XTO
PCM1717E
CLKO
External Clock
Internal System Clock
XTI
XTO
PCM1717E
EXTERNAL CLOCK INPUT
XTO pin = No Connection
CRYSTAL RESONATOR CONNECTION
CLKO
相關PDF資料 |
PDF描述 |
|---|---|
| PCM1718 | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1718E | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1719 | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1719E | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1720 | Stereo Audio DIGITAL-TO-ANALOG CONVERTER MPEG2/AC-3 COMPATIBLE |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM1717E/2K | 功能描述:音頻數/模轉換器 IC SoundPlus 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 |
| PCM1717E/2KG4 | 功能描述:音頻數/模轉換器 IC SoundPlus 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 |
| PCM1717EG | 功能描述:音頻數/模轉換器 IC SoundPlus 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 |
| PCM1717EG4 | 功能描述:音頻數/模轉換器 IC SoundPlus 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 |
| PCM1717EGE6 | 功能描述:音頻數/模轉換器 IC SoundPlus 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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