mV

V

V

mV

+3.0V to +5.5V, 1.25Gbps/2.5Gbps

Limiting Amplifiers

4

_______________________________________________________________________________________

Note 1: Specifications for Input Voltage Range, LOS Assert/Deassert Levels, and CML Output Voltage refer to the total differential

peak-to-peak signal applied or measured. PECL output voltages are absolute (single-ended) voltages measured at a single

output.

Note 2: Input edge speed is controlled using four-pole, lowpass Bessel filters with bandwidth approximately 75% of the maximum

data rate.

Note 3: Deterministic jitter is measured with a K28.5 pattern (0011 1110 1011 0000 0101). Deterministic jitter is the peak-to-peak

deviation from ideal time crossings, measured at the zero-level crossings of the differential output per ANSI X3.230,

Annex A.

Note 4: Random jitter is measured with the minimum input signal applied after filtering with a four-pole, lowpass, Bessel filter (fre-

quency bandwidth at 75% of the maximum data rate). For Fibre Channel and Gigabit Ethernet applications, the peak-to-

peak random jitter is 14.1-times the RMS random jitter.

Note 5: Input signal applied after a 933MHz Bessel filter.

Note 6: Input signal applied after a 1.8GHz Bessel filter.

Note 7: Input for LOS assert/deassert and hysteresis tests is a repeating K28.5 pattern. Hysteresis is defined as:

Note 8: Response time to a 10dB change in input power.

ELECTRICAL CHARACTERISTICS—MAX3265EUE

unless otherwise noted.) (Note 1)

CONDITIONS

Data Rate

Gbps

2.5

UNITS

MIN

TYP

MAX

PARAMETER

Input Voltage Range

mV

10

1200

(Notes 2, 3)

Deterministic Jitter

11

25

(Notes 2, 4)

Random Jitter

8

(Note 6)

Data Output Edge Speed

ps

100

155

(Notes 2, 7)

LOS Hysteresis

dB

2.2

4.4

(Notes 7, 8)

LOS Assert/Deassert Time

µs

1

Output Resistance (single ended)

Ω

85

100

115

kHz

2

Low-Frequency Cutoff

MHz

2

f < 2MHz

Power-Supply Rejection Ratio

dB

20

Outputs AC-coupled

Output Signal When Squelched

20

LOS Output Low Voltage

0.450

LOS Output High Voltage

Ω

1100

1270

1800

Ω

CML Output Voltage

550

1200

Input-Referred Noise

230

IN+ to IN-

Differential Input Resistance

Ω

97

100

103

Squelch Input Current

µA

0

80

400

Ω

High LOS Deassert Level

mV

67

111

Ω

High LOS Assert Level

mV

18.0

41.5

Ω

Medium LOS Deassert Level

mV

27

43.0

Ω

Medium LOS Assert Level

mV

9.9

16

Ω

Low LOS Deassert Level

mV

8.5

13.6

Ω

Low LOS Assert Level

mV

2.20

4.8

Figure 2

Power-Supply Current

mA

50

76

2.4