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參數(shù)資料
| 型號： | PCM1792DB |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 7/61頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 24BIT AUDIO STEREO DAC 28SSOP |
| 產(chǎn)品培訓模塊： | Data Converter Basics |
| 標準包裝： | 47 |
| 位數(shù)： | 24 |
| 數(shù)據(jù)接口： | I²C，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 模擬和數(shù)字 |
| 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） |
| 供應商設備封裝： | 28-SSOP |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 2 電壓，單極 |
| 采樣率（每秒）： | 200k |
| 產(chǎn)品目錄頁面： | 903 (CN2011-ZH PDF) |
| 其它名稱： | 296-15313-5 |
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PCM1792
SLES069B MARCH 2003 REVISED NOVEMBER 2006
www.ti.com
15
SYSTEM CLOCK AND RESET FUNCTIONS
System Clock Input
The PCM1792 requires a system clock for operating the digital interpolation filters and advanced segment DAC
modulators. The system clock is applied at the SCK input (pin 7). The PCM1792 has a system clock detection circuit
that automatically senses if the system clock is operating between 128 fS and 768 fS. Table 1 shows examples of
system clock frequencies for common audio sampling rates. If the oversampling rate of the delta-sigma modulator
is selected as 128 fS, the system clock frequency is over 256 fS.
Figure 24 shows the timing requirements for the system clock input. For optimal performance, it is important to use
a clock source with low phase jitter and noise. One of the Texas Instruments’ PLL1700 family of multiclock generators
is an excellent choice for providing the PCM1792 system clock.
Table 1. System Clock Rates for Common Audio Sampling Frequencies
SAMPLING FREQUENCY
SYSTEM CLOCK FREQUENCY (fSCK) (MHz)
SAMPLING FREQUENCY
128 fS
192 fS
256 fS
384 fS
512 fS
768 fS
32 kHz
4.096(1)
6.144(1)
8.192
12.288
16.384
24.576
44.1 kHz
5.6488(1)
8.4672
11.2896
16.9344
22.5792
33.8688
48 kHz
6.144(1)
9.216
12.288
18.432
24.576
36.864
96 kHz
12.288
18.432
24.576
36.864
49.152(1)
73.728(1)
192 kHz
24.576
36.864
49.152(1)
73.728(1)
(2)
(1) This system clock rate is not supported in I2C fast mode.
(2) This system clock rate is not supported for the given sampling frequency.
t(SCKH)
t(SCY)
System Clock (SCK)
t(SCKL)
2 V
0.8 V
H
L
PARAMETERS
MIN
MAX
UNITS
t(SCY)
System clock pulse cycle time
13
ns
t(SCKH) System clock pulse duration, HIGH
0.4t(SCY)
ns
t(SCKL) System clock pulse duration, LOW
0.4t(SCY)
ns
Figure 24. System Clock Input Timing
Power-On and External Reset Functions
The PCM1792 includes a power-on reset function. Figure 25 shows the operation of this function. With VDD > 2 V,
the power-on reset function is enabled. The initialization sequence requires 1024 system clocks from the time
VDD > 2 V. After the initialization period, the PCM1792 is set to its default reset state, as described in the MODE
CONTROL REGISTERS section of this data sheet.
The PCM1792 also includes an external reset capability using the RST input (pin 14). This allows an external
controller or master reset circuit to force the PCM1792 to initialize to its default reset state.
Figure 26 shows the external reset operation and timing. The RST pin is set to logic 0 for a minimum of 20 ns. The
RST pin is then set to a logic 1 state, thus starting the initialization sequence, which requires 1024 system clock
periods. The external reset is especially useful in applications where there is a delay between the PCM1792 power
up and system clock activation.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1792DB | 制造商:Texas Instruments 功能描述:24BIT AUDIO DAC SMD 1792 SSOP28 |
| PCM1792DBG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1792DBR | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1792DBRG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1793 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:24 BIT 192KHZ SAMPLING ADVANCED SEGMENT AUDIO STEREO DIGITAL TO ANALOG CONVERTER |
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