+3.3V, 622Mbps SDH/SONET

Laser Driver with Current Monitors and APC

_______________________________________________________________________________________

3

AC ELECTRICAL CHARACTERISTICS

Note 3: Both the bias and modulation currents will be disabled if any of the current set pins are shorted to ground.

Note 4: Guaranteed by design and characterization. This assumes that the laser to monitor diode transfer function does not change

with temperature.

Note 5: See Typical Operating Characteristics for worst-case distributions.

Note 6: AC characteristics are guaranteed by design and characterization.

Note 9: Input signal is a 622Mbps, 11110000 pattern.

Note 10:PWD = (wider pulse – narrower pulse) / 2.

DATA+

DATA-

(DATA+) - (DATA-)

100mV MIN

800mV MAX

200mVp-p

MIN

1600mVp-p

MAX

Figure 1. Required Input Signal and Output Polarity

15

Ω

10

Ω

1

µF

1

µF

12.4

Ω

20

Ω

OUT-

OUT+

BIAS

20

Ω

50

Ω

OSCILLOSCOPE

MAX3669

Figure 2. Output Termination for Characterization

10

135

Maximum Consecutive Identical

Digits at 622Mbps

CID

80

Bits

Jitter Generation (peak-to-peak)

100

ps

(Note 8)

205

(Notes 9, 10)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

230

375

ps

Output Rise/Fall Time

100

200

Modulation Current Absolute

Accuracy

-15

15

%

Pulse-Width Distortion

(peak-to-peak)

70

155

ps

Enable/Start-Up Delay

250

ns

Modulation Current Stability

-620

-165

620

ppm/°C

CONDITIONS

20% to 80%,

Open loop

Modulation Current Range

575

mA

(Note 7)

Modulation Off-Current

200

µA

ENABLE = low (Note 3)