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參數資料
| 型號： | UDA1326PS |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | Codec |
| 英文描述： | USB AUDIO-CODEC(通用串行總線音頻編解碼器) |
| 中文描述： | USB音頻編解碼器（通用串行總線音頻編解碼器） |
| 文件頁數： | 18/43頁 |
| 文件大?。?/td> | 678K |
| 代理商： | UDA1326PS |
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Philips
Semiconductors, Inc.
USB-CODEC UDA1325PS
Technical Report
DML98022
18
2.2
Additional External Circuitry
2.2.1 Oscillator Circuit
The USB-CODEC runs at 48MHz. An external signal can be applied to the XTAL input (pin 25). If the USB-
CODEC is used with a crystal, the circuit described in figure 2-12 should be used.
Figure 2-11
Crystal circuitry with 48MHz filtering components
The crystal specifications (summarized):
* Frequency stability in a temperature range of :
- 55 Deg. Celcius to 105 Deg. Celcius => 50ppm typ.
- 10 Deg. Celcius to 60 Deg. Celcius => 10ppm typ.
- Resonance impedance = 40..45 Ohm
- Static capacitance (between electrodes) = 5pF typ.
- Load capacitance = 8pF typ.
* Third overtone crystal.
It is important that the capacitors C2 and C3 have the value as mentioned in figure 2-11. These values are
beside defining crystal frequency output also important for the UDA1325PS internal hardware. There are no
special requirements regarding to the deviation of these capacitors and therefore standard cap’s can be used
(maximum of 25% spread).
There are no special requirements for the inductor.
X1 = 48MHz
C2 = 12pF
C3 = 12pF
C1
L1
XTAL2B
XTAL1B
Pin 25
Pin 26
Values of L1 and C1:
L1 = 1.5uH & C1 = 10nF
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