LM3S8971 Luminary Micro, Inc, LM3S8971 Datasheet - Page 565

• Manufacturer Part Number: LM3S8971
• Description: Lm3s8971 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

July 26, 2008
a. Two simple 1:1 isolation transformers are required at the line interface. Transformers with integrated common-mode
Note:
Table 23-20. Ethernet Reference Crystal
a. If the internal crystal oscillator is used, select a crystal with the following characteristics.
Figure 23-2. External XTLP Oscillator Characteristics
Leakage inductance
Inter-winding capacitance
DC resistance
Insertion loss
HIPOT
Parameters at 25° C ±2° C; Drive level = 0.5 mW
chokes are recommended for exceeding FCC requirements. This table gives the recommended line transformer
characteristics.
T
Temperature stability (-40° to 105°)
Temperature stability (-40° to 85°)
r
The 100Base-TX amplitude specifications assume a transformer loss of 0.4 dB. For the
transmit line transformer with higher insertion losses, up to 1.2 dB of insertion loss can be
compensated by selecting the appropriate setting in the Transmit Amplitude Selection (TXO)
bits in the MR19 register.
Name
Motional capacitance (min)
Spurious response (max)
Shunt capacitance (max)
Serious resistance (max)
Frequency tolerance
Oscillation mode
Drive level (typ)
Frequency
Name
Aging
T
clkhi
0.9 Ohm (max)
0.40 uH (max)
25 pF (max)
0.4 dB (typ)
T
Value
f
1500
T
clkper
@ 1 MHz (min)
Preliminary
T
Condition
0-65 MHz
clklo
Vrms
Parallel resonance, fundamental mode
a
> 5 dB below main within 500 kHz
25.00000
50-100
Value
±50
±2
±5
±5
10
10
60
LM3S8971 Microcontroller
Condition
PPM/yr
PPM
PPM
PPM
MHz
µW
pF
fF
Ω
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