MAX3645EEE datasheet(3/10 Pages) MAXIM

3 / 10 page

+2.97V to +5.5V, 125Mbps to 200Mbps Limiting

Amplifier with Loss-of-Signal Detector

_______________________________________________________________________________________

Note 1: Between sensitivity and overload, the output amplitude is >95% of the fully limited amplitude and all AC specifications are met.

Note 2: Guaranteed by design and characterization.

Note 3: Noise is derived from BER measurement.

Note 4: The data input transition time is controlled by a 4th-order Bessel filter with f-3dB = 0.75

× data rate.

Note 5: PWD = [(width of wider pulse) - (width of narrower pulse)] / 2, measured with 155Mbps 0011 pattern.

Note 6: All LOS specifications are measured using a 155Mbps 223 - 1 PRBS pattern.

Note 7: The signal at the input is switched between two amplitudes, SIGNAL_ON and SIGNAL_OFF, as shown in Figure 1.

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.97V to +5.5V, PECL outputs are terminated with 50

Ω to VCC - 2V, RTH = 100Ω, CAZ = 0.1µF, CSD = 1nF, TA = -40°C to

+85°C. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TRANSFER CHARACTERISTICS

Bandwidth

Gain = 60dB

150

250

MHz

CAZ = open

500

Low-Frequency Cutoff

CAZ = 0.1µF

0.5

kHz

LOSS-OF-SIGNAL SPECIFICATIONS (Notes 2, 4, 6)

LOS Sensitivity Range

Ω ≤ RTH ≤ 2kΩ

220

mVP-P

LOS Hysteresis

10log (VDEASSERT/VASSERT)

1.4

LOS Assert/Deassert Time

(Note 7)

2.3

80.0

µs

RTH = 0

Ω, low setting

0.5

0.9

1.3

RTH = 1k

Ω, medium setting

4.8

6.6

8.3

LOS Assert Level

RTH = 2k

Ω, high setting

mVP-P

RTH = 0

Ω, low setting

1.1

1.5

1.9

RTH = 1k

Ω, medium setting

8.0

10.8

13.5

LOS Deassert Level

RTH = 2k

Ω, high setting

mVP-P

Signal-Dectect Filter Resistance

RSD

Pin 7

Ω

Figure 1. Signal Levels for LOS Assert/Deassert Time

Measurement

TIME

VIN

MAXIMUM DEASSERT LEVEL

1dB

6dB

MAXIMUM POWER-DETECT WINDOW

SIGNAL ON

SIGNAL OFF

MINIMUM ASSERT LEVEL

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