SY88992LMG Просмотр технического описания (PDF) - Micrel

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производитель

SY88992LMG

3.3V, 4.25Gbps VCSEL Driver

Micrel 

Micrel, Inc.

SY88992L

AC Electrical Characteristics

TA = -40°C to +80°C and VCC = 3.0 to 3.6V, unless otherwise noted. Typical values are at VCC = 3.3V, TA = 25°C,

IMOD = 13mA(5), and AC-coupled 50Ω load to ground with 75Ω pull-up (see Figure below).

Symbol Parameter

Condition

Min Typ Max Units

tOFF(6)

tON(7)

Data Rate

Turn OFF Time

Turn ON Time

NRZ

50Ω load

50Ω load

0.1

4.25 Gbps

1

1.5

ns

1.8 2.5

ns

tr

Output Current Rise Time

tf

Output Current Fall Time

20% to 80%, IMOD = 13mA, no

peaking, 50Ω load

20% to 80%, IMOD = 13mA,

IP/IMOD=20%, RIPD=1.5kΩ

20% to 80%, IMOD = 13mA, no

peaking, 50Ω load

20% to 80%, IMOD = 13mA,

IP/IMOD=20%, RIPD=1.5kΩ

65

95

ps

60

75

ps

65

95

ps

60

75

ps

Total Jitter

@ 2.5Gbps data rate, 50Ω load

30

psPP

Pulse-Width Distortion

50Ω load

20

ps

(IP / IMOD)

Max

tP

Maximum Peaking Current-to-

Modulation Current Ratio

Peaking Current Duration(8)

IMOD = 13mA, RIPD_SET = 0Ω

35

%

150

ps

Notes:

5. IMOD is defined as the current at the output of the driver. That current splits between the pull-up network at the output and the VCSEL. For a

nominal pull-up resistor of 75Ω at the output of the driver and a nominal 50Ω VCSEL equivalent resistor, 60% of that current goes to the

VCSEL.

6. Turn-OFF time is defined as the delay between the time the signal at /EN rises to 50% of its amplitude and the time when the output of the

driver reaches 10% of its steady-state amplitude.

7. Turn-ON time is defined as the delay between the time the signal at /EN falls to 50% of its amplitude and the time when the output of the

driver reaches 90% of its steady-state amplitude.

8. The peaking current duration is the time between the start of the peaking current, which is the same as the start of the modulation current

transition, and the time when the peaking current reaches its maximum, i.e., the top of the peak.

Test Circuit

January 2006

5

M9999-011306-A

hbwhelp@micrel.com or (408) 955-1690

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