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参数资料
| 型号： | B900M24FXX12IT |
| 元件分类： | 数字信号处理 |
| 英文描述： | 0-BIT, 59.88 MHz, OTHER DSP, PQCC44 |
| 文件页数： | 97/100页 |
| 文件大小： | 1547K |
| 代理商： | B900M24FXX12IT |
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96
Lucent Technologies Inc.
B900
Advance Data Sheet
Baseband Signal Processor
July 1999
9 Crystal Oscillator Electrical Requirements and Characteristics (continued)
9.2
Frequency Accuracy Considerations (continued)
Typical capacitance variation of oscillator circuit in the B900 itself across process, temperature, and supply voltage
is ±1 pF. Thus, the expected frequency variation due to the B900 is:
(1 pF)(3.4 ppm/pF) = 3.4 ppm
Other frequency accuracy considerations include the following:
s
Approximate variation in parasitic capacitance of crystal = ±0.5 pF
s
Frequency shift due to variation in CO = (0.5 pF)(3.4 ppm/pF) = 1.7 ppm
s
Approximate variation in parasitic capacitance of printed-circuit board = ±1.5 pF
s
Frequency shift due to variation in board capacitance = (1.5 pF)(3.4 ppm/pF) = 5.1 ppm
Therefore, the contributions to frequency variation add up as follows:
Initial Tolerance of Crystal = 10.0 ppm
Temperature Tolerance of Crystal = 25.0 ppm
Aging Tolerance of Crystal = 6.0 ppm
Load Capacitor Variation = 2.8 ppm
B900 Circuit Variation = 3.4 ppm
CO Variation = 1.7 ppm
Board Variation = 5.1 ppm
Total = 54.0 ppm
This type of detailed analysis should be performed for any crystal-based application where frequency accuracy is
critical.
相关PDF资料 |
PDF描述 |
|---|---|
| B900J24PXX12I | 0-BIT, 80 MHz, OTHER DSP, PQFP44 |
| B900J24FXX12IT | 0-BIT, 59.88 MHz, OTHER DSP, PQFP44 |
| BA00CC0WCP-V5 | 1A Low Dropout Voltage Regulator with Shut Down Switch(Adustable Voltage) |
| BA10E6 | COPPER ALLOY, TIN FINISH, RING TERMINAL |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| B901 | 制造商:EDAL 制造商全称:EDAL 功能描述:Silicon Bridge Rectifier |
| B901 10.0MM | 制造商:DORMER TOOLS 功能描述:M/C REAMER B901 10.0MM |
| B901 4.0MM | 制造商:DORMER TOOLS 功能描述:M/C REAMER B901 4.0MM |
| B901 5.0MM | 制造商:DORMER TOOLS 功能描述:M/C REAMER B901 5.0MM |
| B901 8.0MM | 制造商:DORMER TOOLS 功能描述:M/C REAMER B901 8.0MM |
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