78Q2120C Teridian Semiconductor Corp. (TDK Semiconductor), 78Q2120C Datasheet - Page 26

• Manufacturer Part Number: 78Q2120C
• Description: 10/100 Ethernet PHYS
• Manufacturer: Teridian Semiconductor Corp. (TDK Semiconductor)

ANALOG ELECTRICAL CHARACTERISTICS
100BASE-TX Transmitter
Note: Measured at the line side of the transformer.
100BASE-TX Transmitter (Informative)
The specifications in the following table are included for information only. They are mainly a function of the
external transformer and termination resistors used for measurements.
© 2003 TDK Semiconductor Corporation, Proprietary and Confidential
PARAMETER
Peak Output Amplitude (|Vp+|, |Vp-|)
(see note below)
Output Amplitude Symmetry
Output Overshoot
Rise/Fall time (tr, tf)
Rise/Fall time Imbalance
Duty Cycle Distortion
Jitter
PARAMETER
Return Loss
Open-Circuit Inductance
Test Condition: Transformer P/N:
Line Termination:
TLA-6T103
100Ω ±1%
Best-fit over 14 bit
times;
0.5 dB Transformer
loss
Percent of Vp+, Vp-
10-90% of Vp+, Vp-
Deviation from best-fit
time-grid;
010101... Sequence
Scrambled Idle
2 < f < 30 MHz
30 < f < 60 MHz
60 < f < 80 MHz
-8 < Iin < 8 mA
|tr - tf|
|Vp +|
|Vp -|
CONDITION
CONDITION
- 26 -
10/100BASE-TX Transceiver
16 20
0.98
MIN
950
3
−
log
MIN
350
16
10



30
NOM
MHz
f



MAX
1050
±250
MAX
1.02
500
1.4
5
5
78Q2120C
mVpk
UNIT
UNIT
Rev_1.1
µH
dB
ns
ps
ps
ns
%