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參數(shù)資料
| 型號(hào)： | PCM2702E |
| 英文描述： | 16-Bit Stereo DIGITAL-TO-ANALOG CONVERTER with Interface |
| 中文描述： | 16位立體聲數(shù)字模擬轉(zhuǎn)換器的接口 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 117K |
| 代理商： | PCM2702E |
9
PCM2702
FIGURE 2. 12MHz Crystal Resonator Connection.
CLOCK AND RESET
The PCM2702 requires a 12MHz (
±
500ppm) clock for USB
and audio functions, which may be generated by an on-chip
crystal oscillator with external 12MHz crystal resonator, or
supplied by an external clock applied at XTI (pin1).
The 12MHz crystal resonator must be connected to XTI (pin
1) and XTO (pin 28), along with a 1M
resistor and two
small capacitors (value is dependent upon the specified load
capacitance of the crystal resonator). If an external clock is
used, the clock must be supplied at XTI, and XTO must be
left open. The clock signal applied at XTI must be +3.3V
logic level, as this input is not +5V tolerant. Figures 2 and
3 illustrate the circuit connections required for crystal and
external clock options.
The PCM2702 includes an internal power-on reset circuit,
which automatically initializes digital logic when V
DD
ex-
ceeds 2.0V typical (range: 1.6V to 2.4V). Initialization
requires approximately 350
μ
s for completion. The V
DD
supply must rise to 2.0V within 10ms for proper power-on
sequence operation.
INTERFACE SEQUENCE
Power-on, Attach, and Playback Sequence
The PCM2702 is ready for setup when the reset sequence
has finished and the USB bus is connected. After connec-
tion is established, the PCM2702 is ready to accept USB
audio data. While waiting for audio data (idle state), the
analog outputs are set to bipolar zero (BPZ) and the zero
flag, ZERO (pin 12), is set to HIGH.
When receiving the audio data, the PCM2702 stores the first
audio packet, which contains 1ms of audio data, into an
internal storage buffer. The PCM2702 starts playing the
audio data upon detection of the Start of Frame (SOF)
packet.
See Figures 4 and 5 for the normal operation sequence.
FIGURE 3. External 12MHz Clock Input Connection.
1
28
XTAL
12MHz
1M
XTI
XTO
1
28
12MHz External Clock
Must Be Left Open
XTI
XTO
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM2702E | 制造商:Texas Instruments 功能描述:SEMICONDUCTOR ((NW)) |
| PCM2702E/2K | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 16-Bit Stereo DAC w/USB Ifc 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 |
| PCM2702E/2KG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 16-Bit Stereo DAC w/USB Ifc 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 |
| PCM2702EG | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 16-Bit Stereo DAC w/USB Ifc 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 |
| PCM2702EG/2K | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 16-Bit Stereo DAC w/USB Ifc 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 |
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