LM3S6611-IQC20-A0T ETC2 [List of Unclassifed Manufacturers], LM3S6611-IQC20-A0T Datasheet - Page 446

• Manufacturer Part Number: LM3S6611-IQC20-A0T
• Description: Microcontroller
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Electrical Characteristics
446
a. Two simple 1:1 isolation transformers are required at the line interface. Transformers with integrated common-mode
Note:
Table 20-19. Ethernet Reference Crystal
a. If the internal crystal oscillator is used, select a crystal with the following characteristics.
b. Equivalent differential capacitance across XTLP/XTLN.
c. If crystal with a larger load is used, external shunt capacitors to ground should be added to make up the equivalent
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.
capacitance difference.
Temperature stability (0° to 70°)
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
Load capacitance
Oscillation mode
Drive level (typ)
Frequency
Name
Aging
0.9 Ohm (max)
0.40 uH (max)
25 pF (max)
0.4 dB (typ)
Value
1500
b
@ 1 MHz (min)
Preliminary
Condition
0-65 MHz
Vrms
Parallel resonance, fundamental mode
a
> 5 dB below main within 500 kHz
25.00000
50-100
Value
±50
±2
±5
10
10
60
4
c
Condition
PPM/yr
PPM
PPM
MHz
µW
pF
pF
fF
Ω
October 09, 2007