參數(shù)資料
型號(hào)： PCM1807
英文描述： Single-Ended, Analog-Input 24-Bit, 96-kHz Stereo A/D Converter
中文描述： 單端模擬輸入24位，96千赫立體聲A / D轉(zhuǎn)換器
文件頁(yè)數(shù)： 11/29頁(yè)
文件大?。?/td> 426K
代理商： PCM1807
www.ti.com
SYSTEM CLOCK
The PCM1807 supports 256 f
S
, 384 f
S
and 512 f
S
as system clock, where f
S
is the audio sampling frequency. The
system clock must be supplied on SCKI (pin 6).
SCKI
0.8 V
SCKI
2 V
t
w(SCKL)
t
w(SCKH)
T0005B07
FADE-IN AND FADE-OUT FUNCTIONS
The PCM1807 has fade-in and fade-out functions on DOUT (pin 9) to avoid pop noise, and the functions come
into operation in some cases as described in several following sections. The level changes from 0 dB to mute or
mute to 0 dB are performed using calculated pseudo S-shaped characteristics with zero-cross detection.
Because of the zero-cross detection, the time needed for the fade in and fade out depends on the analog input
frequency (f
). It takes 48/f
until processing is completed. If there is no zero cross during 8192/f
, DOUT is
faded in or out by force during 48/f
S
(TIME OUT).
Figure 18
illustrates the fade-in and fade-out operation
processing.
PCM1807
SLES147–SEPTEMBER 2005
The PCM1807 has a system clock detection circuit which automatically senses if the system clock is operating at
256 f
S
, 384 f
S
, or 512 f
S
in slave mode. In master mode, the system clock frequency must be controlled through
the serial control port, which uses MD (pin 10), MC (pin 11), and MS (pin 12). The system clock is divided down
automatically to generate frequencies of 128 f
S
and 64 f
S
, which are used to operate the digital filter and the
delta-sigma modulator, respectively.
Table 1
shows some typical relationships between sampling frequency and system clock frequency, and
Figure 17
shows system clock timing.
Table 1. Sampling Frequency and System Clock Frequency
SAMPLING FREQUENCY (kHz)
SYSTEM CLOCK FREQUENCY (f
SCLK
) (MHz)
384 f
S
6.144
12.288
16.9344
18.432
24.576
33.8688
36.864
256 f
S
4.096
8.192
11.2896
12.288
16.384
22.5792
24.576
512 f
S
8.192
16.384
22.5792
24.576
32.768
45.1584
49.152
16
32
44.1
48
64
88.2
96
SYMBOL
t
w(SCKH)
t
w(SCKL)
PARAMETER
MIN
8
8
MAX
UNIT
ns
ns
System clock pulse duration, HIGH
System clock pulse duration, LOW
Figure 17. System Clock Timing
11
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參數(shù)描述
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PCM1807PWRG4 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-bit 96kHz Stereo Audio DAC RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風(fēng)格: 封裝 / 箱體: 封裝:
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