Datasheet

DS_21x3_001 78Q2123/78Q2133 Data Sheet
4.7.4 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
(dB below fundamental)
Any harmonic
All ones data
Not tested
27
dB
Link Pulse Width 100 ns
Start-of-Idle Pulse Width Last bit 0
Last bit 1
300
350
ns
ns
Note: Measured at the line side of the transformer.
Test Condition: Transformer P/N: TLA-6T103
Line Termination:
100:±1%
4.7.5 10BASE-T 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.
Parameter Condition Min Nom Max Unit
Output return loss 15 dB
Output Impedance Balance 1 MHz < freq < 20 MHz
29  17log
§
f
·

¨ ¸ 
©
10
¹ 
dB
Peak Common-mode Output
Voltage
50 mV
Common-mode rejection
15 V
pk
, 10.1 MHz sine wave
applied to transmitter
common-mode. All data
sequences.
100 mV
Common-mode rejection jitter
15 V
pk
, 10.1 MHz sine wave
applied to transmitter
common-mode. All data
sequences.
1ns
4.7.6 10BASE-T Receiver
Parameter Condition Min Nom Max Unit
DLL Phase Acquisition Time 10 BT
Jitter Tolerance (pk-pk) 30 ns
Input Squelched Threshold 500 600 700 mVppd
Input Unsquelched Threshold 275 350 425 mVppd
Differential Input Resistance 20
k:
Bit Error Ratio
10
-10
Common-mode rejection Square wave
0 < f < 500 kHz
Not tested
25 V
31