MAX3946_10 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX3946_10
Maxim Integrated
MAX3946_10 Datasheet PDF : 28 Pages
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1.0625Gbps 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)
100
CURRENT INTO VCC, VCCT, AND VCCD PINS
90
80
70
60
50
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
BIAS CURRENT
vs. DAC SETTING
120
100
80
60
40
20
0
0
200
400
600
SET_IBIAS[8:0]
BIAS MONITOR CURRENT
vs. TEMPERATURE
700
600
500
IBIAS = 60mA
400
IBIAS = 30mA
300
200
IBIAS = 10mA
100
0
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
TOTAL CURRENT vs. TEMPERATURE
(IMOD AT LOAD = 40mAP-P, IBIAS = 60mA)
220
CURRENT INTO VCC, VCCT, AND VCCD PINS
210 PLUS MODULATION AND BIAS CURRENT
200
190
25Ω LOAD
180 ITOTAL (25Ω LOAD) = 45.8 + 1.038 x IBIAS +
2.08 x IMOD
170
160
5Ω LOAD
150
ITOTAL (5Ω LOAD) = 45.8 + 1.038 x IBIAS +
1.57 x IMOD
140
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
MODULATION CURRENT (AT LOAD)
vs. DAC SETTING
90
80
70
RLOAD = 25Ω
DIFFERENTIAL
60
50
40
30
RLOAD = 50Ω
DIFFERENTIAL
20
10
0
0
200
400
600
SET_IMOD[8:0]
TRANSITION TIME
vs. MODULATION CURRENT
40
25Ω LOAD, 20% TO 80%
10Gbps, 11111 00000 PATTERN
35
30
25
FALL TIME
20
15
RISE TIME
10
0
20
40
60
80 100
IMOD (mA)
EYE CROSSING PERCENT
vs. SET_PWCTRL
75
70
65
60
55
50
45
40
35
30
25
SET_PWCTRL[3:0]
MODULATION CURRENT DEEMPHASIS
vs. MANUAL DEEMPHASIS SETTING
10
SET_IMOD[8:0] = 230d
9 TXDE_MD[1:0] = 2d
8
7
6
5
4
3
2
1
0
10
20
30
40
SET_TXDE[5:0]
TRANSITION TIME
vs. DEEMPHASIS SETTING
40
SET_IMOD[8:0] = 230d
25Ω LOAD, 20% TO 80%
35 10Gbps, 1111 0000 PATTERN
30
25
FALL TIME
20
RISE TIME
15
10
10
20
30
40
SET_TXDE[5:0]
8 _______________________________________________________________________________________
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