Datasheet

MAX3740A
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, R
TC
= 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT+, T
A
= +25°C, unless otherwise
noted.)
BIAS CURRENT vs. R
BIASSET
MAX3740A toc10
R
BIASSET
(Ω)
BIAS CURRENT (A)
10k
1m
10m
100m
100μ
1k 100k
MODULATION CURRENT vs. R
MODSET
MAX3740A toc11
R
MODSET
(Ω)
MODULATION CURRENT (A
P-P
)
1k
10m
100m
1m
10k100
MEASURED WITH A
50Ω ELECTRICAL LOAD
MONITOR DIODE CURRENT
vs. R
PWRSET
MAX3740A toc12
R
PWRSET
(Ω)
MONITOR DIODE CURRENT (A)
1k
10μ
100μ
1m
10m
1μ
100 10k
SUPPLY CURRENT vs. TEMPERATURE
MAX3740A toc13
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
603510-15
20
30
40
50
60
70
80
10
-40 85
I
MOD
= 2mA
I
MOD
= 15mA
INPUT RETURN LOSS
MAX3740A toc14
FREQUENCY (Hz)
S
11
(dB)
1G
-35
-30
-25
-20
-15
-10
-5
0
-40
100M 10G
DIFFERENTIAL
MEASUREMENT
OUTPUT RETURN LOSS
MAX3740A toc15
FREQUENCY (Hz)
S
22
(dB)
1G
-16
-14
-12
-10
-8
-6
-4
-2
0
-18
100M 10G
SINGLE-ENDED
MEASUREMENT
MODULATION CURRENT
vs. TEMPERATURE
MAX3740A toc16
TEMPERATURE (°C)
MODULATION CURRENT (mA
P-P
)
8070605040302010
5
6
7
8
9
10
11
4
090
R
MOD
= 1.35kΩ
R
TC
= 1kΩ
R
TC
= 500kΩ
R
TC
= 100kΩ
R
TC
= 60kΩ
R
TC
= 10kΩ
R
TC
= 5kΩ
R
TC
= 100Ω
MODULATION CURRENT TEMPCO
vs. R
TC
MAX3740A toc17
R
TC
(Ω)
TEMPCO (ppm/°C)
100k10k1k
500
1500
2500
3500
4500
5500
-500
100 1M
REFERENCED TO +25°C
MONITOR DIODE CURRENT
vs. TEMPERATURE
MAX3740A toc18
TEMPERATURE (°C)
MONITOR DIODE CURRENT (μA)
6035-15 10
125
150
175
200
225
250
275
300
100
-40 85