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參數資料
| 型號： | UDA1331H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Universal Serial Bus USB Audio Playback Peripheral APP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-319-2, QFP-64 |
| 文件頁數： | 23/40頁 |
| 文件大小： | 181K |
| 代理商： | UDA1331H |
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1998 Oct 06
23
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Peripheral (APP)
UDA1331H
Table 9
6-pins digital I/O communication
Filter characteristics
The overall filter characteristic of the UDA1331H in flat mode is given in Fig.6. The overall filter characteristic of the
UDA1331H includes the filter characteristics of the DSP in flat mode plus the filter characteristic of the FSDAC
(f
s
= 44.1 kHz).
DSP extension port
An external DSP can be used for adding extra sound processing features via the digital I/O-bus. The UDA1331H
supports the standard I
2
S-bus data protocol and the LSB-justified serial data input format with word lengths
of 16, 18 and 20 bits. Using the 4-pins digital I/O-bus the UDA1331H device acts as a master, controlling the BCK and
WS signals. The period of the WS signal is determined by the number of samples in the 1 ms frame of the USB. This
implies that the WS signal does not have a constant period time, but is jittery. Using the 6-pins digital I/O-bus GP2, GP3
and GP4 are the output pins (master) and GP0, GP1 and GP5 are the input pins (slave).
For characteristic timing of the I
2
S-bus input interface see Figs 7 and 8.
PIN
GP5
GP4
GP3
GP2
GP1
GP0
INPUT/OUTPUT
FUNCTION
digital I/O-bus
WSI
BCKO
WSO
DO
DI
BCKI
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