MAX3946_11 datasheet(8/29 Pages) MAXIM

Part #	MAX3946

Description	1Gbps to 11.3Gbps, SFP Laser Driver with Laser Impedance Mismatch Tolerance

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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8 ______________________________________________________________________________________

1Gbps to 11.3Gbps, SFP+ Laser Driver

with Laser Impedance Mismatch Tolerance

Typical Operating Characteristics (continued)

(VCC = +3.3V, TA = +25°C, data pattern = 27 - 1 PRBS + 72 zeros + 27 - 1 PRBS (inverted) +72 ones, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

(IMOD = 40mAP-P, IBIAS = 60mA)

TEMPERATURE (°C)

95

80

65

50

35

20

5

-10

-25

60

70

80

90

100

50

-40

CURRENT INTO VCC, VCCT, AND VCCD PINS

TOTAL CURRENT vs. TEMPERATURE

(IMOD AT LOAD = 40mAP-P, IBIAS = 60mA)

TEMPERATURE (°C)

95

80

-25 -10 5

35 50

20

65

150

160

170

180

190

200

210

220

140

-40

CURRENT INTO VCC, VCCT, AND VCCD PINS

PLUS MODULATION AND BIAS CURRENT

25

Ω LOAD

5

Ω LOAD

EYE CROSSING PERCENT

vs. SET_PWCTRL

SET_PWCTRL[3:0]

30

35

40

45

50

55

60

65

70

75

25

BIAS CURRENT

vs. DAC SETTING

SET_IBIAS[8:0]

400

200

20

40

60

80

100

120

0

600

MODULATION CURRENT (AT LOAD)

vs. DAC SETTING

SET_IMOD[8:0]

400

200

10

20

30

40

50

60

70

80

90

0

600

RLOAD = 25Ω

DIFFERENTIAL

RLOAD = 50Ω

DIFFERENTIAL

MODULATION CURRENT DEEMPHASIS

vs. MANUAL DEEMPHASIS SETTING

SET_TXDE[5:0]

30

20

1

2

3

4

5

6

7

8

9

10

0

10

40

SET_IMOD[8:0] = 230d

TXDE_MD[1:0] = 2d

BIAS MONITOR CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

95

80

65

50

35

20

5

-25 -10

100

200

300

400

500

600

700

0

-40

IBIAS = 60mA

IBIAS = 30mA

IBIAS = 10mA

EDGE SPEED

vs. MODULATION CURRENT

IMOD (mA)

80

60

40

20

15

20

25

30

35

40

10

0

100

FALL TIME

RISE TIME

25

Ω LOAD, 20% TO 80%

10Gbps, 11111 00000 PATTERN

EDGE SPEED

vs. DEEMPHASIS SETTING

SET_TXDE[5:0]

30

20

15

20

25

30

35

40

10

40

FALL TIME

RISE TIME

SET_IMOD[8:0] = 230d

25

Ω LOAD, 20% TO 80%

10Gbps, 1111 0000 PATTERN

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