MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 161

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

Please note that the frequency modulation system is dependent upon several factors. The
accuracies of the VDDPLL/VSSPLL voltage, of the crystal oscillator frequency, and of the
manufacturing variation.
For example, if a 5% accurate supply voltage is utilized, then a 5% modulation depth error will
result. If the crystal oscillator frequency is skewed from 8MHz, the resulting modulation
frequency will be proportionally skewed. Finally, the error due to the manufacturing and
environment variation alone can cause the frequency modulation depth error to be greater than
20%.
Freescale Semiconductor
4. Write a value of RFD = RFD + 1 to the RFD field of the SYNCR to ensure the maximum
5. Program the desired modulation rates and depths to the RATE and DEPTH fields in the
6. Allow time for the calibration sequence. Wait for the PLL to lock (the LOCK bit to set in
system frequency is not exceeded during the calibration routine.
SYNCR. This action initiates the calibration sequence.
the SYNSR). At this time CALDONE should be asserted. CALPASS will be asserted if
the calibration was successful. If not, the calibration can be re-initiated by repeating from
step 2. When the PLL achieves lock, write the desired RFD value.
F
F
max
min
f
Fmax = f
Fmin = f
Fmod = Fref/Q where Q = {40, 80}
Figure 7-6. Frequency Modulation Waveform
sys/2
sys/2
MCF5235 Reference Manual, Rev. 2
∆Fm
+ {1%, 2%}
- {1%, 2%}
∆t
=
----------- -
F
mod
1
∆Fm
Functional Description
t
7-17