MAX3948 Просмотр технического описания (PDF) - Maxim Integrated
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MAX3948 Datasheet PDF : 37 Pages
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MAX3948
11.3Gbps, Low-Power, DC-Coupled Laser Driver
Typical Operating Characteristics (continued)
(Typical values are at VCC = VCCT = 3.3V, TA = +25°C, data pattern = 27 - 1 PRBS + 72 zeros + 27 - 1 PRBS (inverted) + 72 ones,
unless otherwise noted.)
TOTAL CURRENT vs. TEMPERATURE
(LDMOD AT LOAD = 40mAP-P, LDDC = 20mA)
140
CURRENT INTO VCC AND VCCT PINS PLUS
135 MODULATION, DEEMPHASIS, AND DC DAC
CURRENT, DIFFERENTIAL LASER LOAD = 5Ω
130
125
120
115
110
105
DC CURRENT vs. DAC SETTING
70
60
50
40
30
20
10
MODULATION CURRENT (AT LOAD)
vs. DAC SETTING
100
90
80 5Ω DIFFERENTIAL LOAD
70
60
50
40
10Ω DIFFERENTIAL LOAD
30
20
10
25Ω DIFFERENTIAL LOAD
100
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
0
0 100 200 300 400 500 600
SET_IDC[8:0]
0
0 100 200 300 400 500 600
SET_IMOD[8:0]
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
20
40
60
80 100 120
SET_TXDE[6:0]
DC MONITOR CURRENT
vs. TEMPERATURE
1000
900
800
700
IDC = 50mA
600
IDC = 25mA
500
400
300
IDC = 10mA
200
100
0
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
EDGE SPEED vs. MODULATION CURRENT
50
10.3Gbps, 1111 0000 PATTERN
45 20% TO 80%
40
35
FALL TIME
30
25
20
RISE TIME
15
10
0
20
40
60
80 100
IMOD (mA)
EDGE SPEED vs. DEEMPHASIS SETTING
50
SET_IMOD[8:0] = 230d
45 20% TO 80%
10.3Gbps, 1111 0000 PATTERN
40
35
FALL TIME
30
25
20
RISE TIME
15
10
20
45
70
95
120
SET_TXDE[6:0]
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