Rainbow-electronics MAX3645 Uživatelský manuál stáhnout pdf (Strana 3)

MAX3645

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

Amplifier with Loss-of-Signal Detector

_______________________________________________________________________________________ 3

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 2

- 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)

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

- 2V, R

= 100Ω, C

= 0.1µF, C

= 1nF, T

= -40°C to

+85°C. Typical values are at V

= +3.3V, T

= +25°C, unless otherwise noted.)

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

TRANSFER CHARACTERISTICS

Bandwidth Gain = 60dB 150 250 MHz

= open 500

Low-Frequency Cutoff

= 0.1µF 0.5

kHz

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

LOS Sensitivity Range 0Ω ≤ R

≤ 2kΩ 220mV

P-P

LOS Hysteresis 10log (V

DEASSERT

ASSERT

) 1.4 2 dB

LOS Assert/Deassert Time (Note 7) 2.3 80.0 µs

= 0Ω, low setting 0.5 0.9 1.3

= 1kΩ, medium setting 4.8 6.6 8.3LOS Assert Level

= 2kΩ, high setting 12 17 22

P-P

= 0Ω, low setting 1.1 1.5 1.9

= 1kΩ, medium setting 8.0 10.8 13.5LOS Deassert Level

= 2kΩ, high setting 20 28 36

P-P

Signal-Dectect Filter Resistance R

Pin 7 14 20 26 kΩ

Figure 1. Signal Levels for LOS Assert/Deassert Time

Measurement

TIME

MAXIMUM DEASSERT LEVEL

1dB

6dB MAXIMUM POWER-DETECT WINDOW

SIGNAL ON

SIGNAL OFF

MINIMUM ASSERT LEVEL

1 2 3 4 5 6 7 8 9 10

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