參數(shù)資料
型號(hào)： PCM1742KE
英文描述： AC 7C 7#12 SKT RECP
中文描述： 24位192kHz采樣加強(qiáng)多層次，Δ-Σ，音頻數(shù)字模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 8/22頁(yè)
文件大?。?/td> 322K
代理商： PCM1742KE
PCM1742
SBAS176
8
SYSTEM CLOCK AND RESET
FUNCTIONS
SYSTEM CLOCK INPUT
The PCM1742 requires a system clock for operating the
digital interpolation filters and multilevel delta-sigma modu-
lators. The system clock is applied at the SCK input (pin 16).
Table I shows examples of system clock frequencies for
common audio sampling rates.
Figure 1 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. The PLL1700 multi-
clock generator from Texas Instruments is an excellent choice
for providing the PCM1742 system clock.
POWER-ON RESET FUNCTIONS
The PCM1742 includes a power-on reset function, as shown in
Figure 2. With the system clock active, and V
DD
> 2.0V (typical
1.6V to 2.4V), the power-on reset function will be enabled. The
initialization sequence requires 1024 system clocks from the
time V
DD
> 2.0V. After the initialization period, the PCM1742
will be set to its reset default state, as described in the Mode
Control Register section of this data sheet.
During the reset period (1024 system clocks), the analog
outputs are forced to the bipolar zero level, or V
CC
/2. After
the reset period, the internal register is initialized in the next
1/f
S
period and, if SCK, BCK, and LRCK are provided
continuously, the PCM1742 provides proper analog output
with unit group delay against the input data.
FIGURE 1. System Clock Input Timing.
FIGURE 2. Power-On Reset Timing.
1024 System Clocks
Reset
Reset Removal
V
DD
Internal Reset
2.4V
2.0V
1.6V
0V
System Clock
Don't Care
t
SCKH
t
SCKL
2.0V
0.8V
System Clock
System clock pulse
cycle time
(1)
“
H
”
“
L
”
System Clock Pulse Width HIGH t
SCKH
: 7ns (min)
System Clock Pulse Width LOW t
SCKL
: 7ns (min)
NOTE: (1) 1/256f
S
, 1/384f
S
, 1/512f
S
, and 1/768f
S
.
SAMPLING
FREQUENCY
128f
S
192f
S
256f
S
384f
S
512f
S
768f
S
8kHz
16kHz
32kHz
44.1kHz
48kHz
88.2kHz
96kHz
192kHz
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.0480
4.0960
8.1920
11.2896
12.2880
22.5792
24.5760
See Note (1)
3.0720
6.1440
12.2880
16.9344
18.4320
33.8688
36.8640
See Note (1)
4.0960
8.1920
16.3840
22.5792
24.5760
45.1584
49.1520
See Note (1)
6.1440
12.2880
24.5760
33.8688
36.8640
See Note (1)
See Note (1)
See Note (1)
24.5760
36.8640
NOTE: (1) This system clock is not supported for the given sampling frequency.
TABLE I. System Clock Rates for Common Audio Sampling Frequencies.
SYSTEM CLOCK FREQUENCY (f
SCLK
) (MHz)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCM1742KE/2K 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHZ Samp Enh Delta-Sig 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
PCM1742KE/2KG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHZ Samp Enh Delta-Sig 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
PCM1742KEG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHZ Samp Enh Delta-Sig 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
PCM1744 制造商:BB 制造商全稱:BB 功能描述:24 Bits, 96kHz, Sampling Stereo Audio DIGITAL-TO-ANALOG CONVERTER
PCM1744U 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24 Bit 96kHz Smplg 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
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