参数资料
型号: B900J24PXX12I
元件分类: 数字信号处理
英文描述: 0-BIT, 80 MHz, OTHER DSP, PQFP44
文件页数: 97/100页
文件大小: 1547K
代理商: B900J24PXX12I
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.
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