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參數(shù)資料
| 型號(hào)： | XWM8733ED |
| 廠(chǎng)商： | Wolfson Microelectronics |
| 英文描述： | Filament Replacement LED Lamp; Color:Warm White; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No; Voltage Rating:24V; Bulb Size:T-3 1/4; Forward Current:30mA; Forward Voltage:24V; LED Color:Warm White RoHS Compliant: No |
| 中文描述： | 為102dB立體聲DAC |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 365K |
| 代理商： | XWM8733ED |
Product Preview
WM8733
WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 July 2000
9
SYSTEM CLOCK
The system clock is used to operate the digital filters and the noise shaping circuits. The system
clock input is at pin 14 (SCKI). The frequency of WM8733
’
s system clock should be set to 256fs or
384fs or 512fs, (where fs is the audio sampling frequency). The sample rate is typically: 32 kHz, 44.1
kHz, 48 kHz or 96kHz.
WM8733 has a system clock detection circuit that automatically determines whether the system
clock being supplied is at 256fs or 384fs or 512fs. The system clock should be synchronised with
LRCIN, but WM8733 is tolerant of phase differences. Severe distortion in the phase difference
between LRCIN and the system clock will be detected, and cause the device to automatically
resynchronise. During resynchronisation, the output of the device will either repeat the previous
sample, or drop the next sample, depending on the nature of the phase slip. This will ensure minimal
“
click
“
at the analog outputs during resynchronisation.
t
SCKIH
t
SCKIL
SCKI
Figure 5 System Clock Timing Requirements
SYSTEM CLOCK FREQUENCY (MHz)
384fs
12.288
SAMPLING RATE
(LRCIN)
32 kHz
256fs
8.192
512fs
16.384
44.1 kHz
48 kHz
96kHz
11.2896
12.288
24.576
16.9340
18.432
36.864
22.5792
24.576
49.152
Table 5 System Clock Frequencies Versus Sampling Rate
LRCIN
BCKIN
DIN
t
BCH
t
BCL
t
LB
t
BL
t
BCY
t
DS
t
DH
Figure 6 Audio Data Input Timing
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