81250 Datasheet, PDF (54/64 Pages) Keysight Technologies – Agilent ParBERT 81250 Parallel Bit Error Ratio Tester

Table 68. External input and ext. clock/ext. ref. input
E4805B
E4808A
Zin/termination voltage
50 Ω /-2.10 V to 3.30 V
50 Ω /-2.10 V to 3.30 V
Sensitivity/max levels
400 mVpp/-3 V to + 6 V
200 mVpp/-3 V to + 6V for < 9.5 Gbit/s
300 mVpp/-3 V to+ 6 V for > 9.5 Gb/s
Coupling
dc
dc
Ext. input:
Threshold range: –1.40 V to +3.70 V
–1.40 V to +3.70 V
Ext. clock/ext. ref:
ac
ac
Input transitions/slope
< 20 ns. ext. input active edge is selectable < 20 ns. ext. input active edge is selectable
Clock input
multiplier(m)/divider (n)
m = 1...256; n = 1...256
m*n < = 1024 m/n * input frequency must fit data range input frequency/n > = 1.3 MHz
PLL lock time
100 ms
100 ms
Input frequency/period
Ext. clock
170 kHz - 2.7 GHz
170 kHz - 10.8 GHz
Ext. ref
1(1), 2(1), 5, or 10 MHz
1(1), 2(1), 5, or 10 MHz
Required duty cycle
50 ±10 %
50 ±10 %
Latency (typical):
to trigger output to channel output to trigger output to trigger output
Ext. input
16ns ±1 clock
46ns ±1 clock
16 ns ±1 clock
46 ns ±1 clock(2)
Ext. clock
15 ns
45 ns
15 ns
45 ns
Add 3 ns if an expander frame is used Add 3 ns if an expander frame is used
(1) Jitter performance may be degraded
(2) If frequency = 667 MHz
Trigger ouput
Can be used in:
• Clock mode
• Sequence mode
In sequence mode a pulse will
be set to mark the start of any
segment.
In clock mode, the trigger output
can supply a clock output of up
to 675 MHz. If a higher speed
performance clock is needed:
• A 2.7 Gb/s generator can
be used to supply a clock
output up to 2.7 GHz
• A 10.8 Gb/s generator can
be used to supply a clock
output up to 10.8 GHz.
Table 69. Trigger output characteristics E4805B and E4808A
Trigger output signals
• Clock mode (up to 675 MHz).
• Sequence mode
Output impedance
50 Ω typ.
Output level
TTL (frequency < 180 MHz), 50 Ω to GND
ECL 50 Ω to GND/-2 V, PECL 50 Ω +3 V
Trigger advance
30 ns typ. between trigger output and data output
/sampling point (delay set to zero in both cases)
Maximum ext voltage
–2 V to +3.3 V
Jitter (int. reference/int. clock) < 10 ps rms (5 ps typ.)
Technical specifications
All specifications describe
the instrument’s warranted
performance. Non-warranted
values are described as typical.
All specifications are valid from
10 ° to 40 ° ambient temperature
after a 30 minute warm-up
phase, with outputs and inputs
terminated with 50 Ohms to
ground at ECL levels unless
specified otherwise.
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