Rainbow-electronics MAX3798 Manual de usuario descargar pdf (Pagina 12)

MAX3798

1.0625Gbps to 10.32Gbps, Integrated, Low-

Power SFP+ Limiting Amplifier and VCSEL Driver

12 ______________________________________________________________________________________

Typical Operating Characteristics—VCSEL Driver (continued)

= 3.3V, T

= +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set to

default values unless otherwise noted, and the 3-wire interface is static during measurements. For testing, the MODE_SEL bit was

used and the MSEL pin was left open.)

MODULATION CURRENT

vs. DAC SETTING

MAX3798 toc26

SET_IMOD[8:0]

MODULATION CURRENT (mA)

25020015010050

0 300

LOAD

= 50Ω

LOAD

= 75Ω

LOAD

= 100Ω

BIAS CURRENT

vs. DAC SETTING

MAX3798 toc27

SET_IBIAS[8:0]

BIAS CURRENT (mA)

25020015010050

0 300

TRANSMITTER DISABLE

MAX3798 toc28

100ns/div

FAULT

DISABLE

OUTPUT

LOW

HIGH

3.3V

TRANSMITTER ENABLE

MAX3798 toc29

1μs/div

FAULT

DISABLE

OUTPUT

LOW

HIGH

3.3V

= 420ns

RESPONSE TO FAULT

MAX3798 toc30

1μs/div

BIAS

FAULT

DISABLE

OUTPUT

LOW

HIGH

EXTERNALLY

FORCED FAULT

FAULT RECOVERY

MAX3798 toc31

4μs/div

BIAS

FAULT

DISABLE

OUTPUT

LOW

HIGH

EXTERNAL

FAULT

HIGH

FREQUENCY ASSERTION OF DISABLE

MAX3798 toc32

4μs/div

BIAS

FAULT

DISABLE

OUTPUT

LOW

HIGH

EXTERNALLY

FORCED FAULT

Tx INPUT RETURN LOSS

MAX3798 toc33

FREQUENCY (Hz)

SDD11 (dB)

10G1G

-50

-40

-30

-20

-10

-60

100M 100G

Tx OUTPUT RETURN LOSS

MAX3798 toc34

FREQUENCY (Hz)

SDD22 (dB)

10G1G

-40

-35

-30

-25

-20

-15

-10

-5

-45

100M 100G

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 34 35

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Rainbow-electronics MAX3798 Manual de usuario Pagina 12

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