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Datasheet
41
155 Mbps SDH/SONET/ATM Transceiver — LXT6155
LOS Thresholds - Coax
Assert
18
dB
Attenuation measured at 78
MHz, CMI, 75
load. 12.7 dB
cable loss plus remaining flat
loss.
De-assert
17
dB
LOS hysteresis - coax
HYS
1.0
4.0
dB
Measured from the level where
LOS is asserted. PRBS(23)
data.
Receive jitter generation
2
(intrinsic jitter SONET spec)
12 kHz - 1.3 MHz
0.01
UIrms
CMI encoded PRBS(23) at
RTIP/RRING with no data jitter.
Transmit input = all zeros Refer
to Figure 27 and Table 33.
0.1
UIpp
Receive jitter generation
2
(intrinsic jitter SDH spec)
500 Hz - 1.3 MHz
1.5
UIpp
65 kHz - 1.3 MHz
0.075
UIpp
Receive jitter transfer peaking
2
DC - 230 kHz
0.4
dB
PRBS(23) Data. Input jitter as
the max. tolerance curve
shown in Figure 26.
Receive jitter tolerance
2
0.1 Hz - 19.3 Hz
39
UIpp
BER=1E-10. Tolerated jitter
meets Figure 26
500 Hz - 6.5 kHz
1.5
UIpp
65 kHz -
0.15
UIpp
PLL nominal center frequency
Fnom
155.52
MHz
PLL capture range
Fcap
-20
+20
ppm
PLL track range
Ftrack
-20
+20
ppm
PLL lock time
Tlock
100
μ
s
PRBS(23) pattern, from data
appliedatRTIP/RRING.Device
in fiber optic mode.
Equalizer adaptation time
500
bits
From data applied
Line input impedance
(RTIP and RRING)
RIN
4
k
Differential resistance
Parameter
Sym
Min
Typ
Max
Unit
Test Conditions
1
Rise/Fall time - All TTL outputs
tRF
25
ns
Load 1.6mA, 50pF
SDI to SCLK setup time
tDC
5
ns
SCLK to SDI hold time
tCDH
5
ns
SCLK low time
tCL
120
ns
SCLK high time
tCH
120
ns
SCLK rise and fall time
tR, tF
25
ns
CS to SCLK setup time
tCC
5
ns
SCLK to CS hold time
tCCH
5
ns
CS inactive time
tCWH
5
ns
SCLK to SDO valid
tCDV
0
20
ns
1. Typical values are at 25C and 3.3V. They are for design aid only; not guaranteed and not subject to production testing.
Table 31. Receive Analog Characteristics (Continued)
Parameter
Note
Min
Typ
1
Max
Unit
Test Conditions
1. Typical values are at 25C and 3.3V. They are for design aid only; not guaranteed and not subject to production testing.
2. Not production tested, guaranteed by design and other correlation factors.