78Q2120C
10/100BASE-TX
Transceiver
100BASE-TX Receiver
PARAMETER
CONDITION
MIN
500
275
NOM
600
350
20
MAX
700
UNIT
mVppd
mVppd
kΩ
Signal Detect Assertion Threshold
Signal Detect De-assertion Threshold
Differential Input Resistance
Jitter Tolerance (pk-pk)
425
Not tested in production
4
ns
Baseline Wander Tracking
Signal Detect Assertion Time
Signal Detect De-assertion Time
-75
+75
1000
4
%
µs
µs
Not tested
Not tested
10BASE-T Transmitter
The Manchester-encoded data pulses, the link pulse and the start-of-idle pulse are tested against the templates
and using the procedures found in Clause 14 of IEEE 802.3.
PARAMETER
CONDITION
MIN
NOM
MAX
UNIT
Peak Differential Output Signal
(see note below)
All data patterns
2.2
2.8
V
Harmonic Content
All ones data
Not tested
27
dB
(dB below fundamental)
Link Pulse Width
Start-of-Idle Pulse Width
100
300
350
ns
ns
ns
Last bit 0
Last bit 1
Note: Measured at the line side of the transformer.
Test Condition: Transformer P/N:
Line Termination:
TLA-6T103
100Ω ±1%
Page: 28 of 35
© 2009 Teridian Semiconductor Corporation
Rev 1.3
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
