参数资料
| 型号： | PCM1792DB |
| 厂商： | Texas Instruments |
| 文件页数： | 7/61页 |
| 文件大小： | 0K |
| 描述： | IC 24BIT AUDIO STEREO DAC 28SSOP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 47 |
| 位数： | 24 |
| 数据接口： | I²C，串行，SPI? |
| 转换器数目： | 2 |
| 电压电源： | 模拟和数字 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 输出数目和类型： | 2 电压，单极 |
| 采样率（每秒）： | 200k |
| 产品目录页面： | 903 (CN2011-ZH PDF) |
| 其它名称： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCM1792DB | 制造商:Texas Instruments 功能描述:24BIT AUDIO DAC SMD 1792 SSOP28 |
| PCM1792DBG4 | 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel |
| PCM1792DBR | 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel |
| PCM1792DBRG4 | 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel |
| PCM1793 | 制造商:TI 制造商全称:Texas Instruments 功能描述:24 BIT 192KHZ SAMPLING ADVANCED SEGMENT AUDIO STEREO DIGITAL TO ANALOG CONVERTER |
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