Rainbow Electronics MAX3799 User Manual
Page 12
MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
12
______________________________________________________________________________________
Typical Operating Characteristics—VCSEL Driver (continued)
(V
CC
= 3.3V, T
A
= +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 RATE_SEL bit was
used and the RSEL pin was left open.)
BIAS CURRENT
vs. DAC SETTING
MAX3799 toc28
SET_IBIAS[8:0]
BIAS CURRENT (mA)
250
200
150
100
50
2
4
6
8
10
12
14
0
0
300
TRANSMITTER DISABLE
MAX3799 toc29
100ns/div
V
CC
FAULT
DISABLE
OUTPUT
LOW
LOW
HIGH
3.3V
TRANSMITTER ENABLE
MAX3799 toc30
1
μs/div
V
CC
FAULT
DISABLE
OUTPUT
LOW
LOW
HIGH
3.3V
t
ON
= 420ns
RESPONSE TO FAULT
MAX3799 toc31
1
μs/div
V
BIAS
FAULT
DISABLE
OUTPUT
LOW
LOW
HIGH
EXTERNALLY
FORCED FAULT
FAULT RECOVERY
MAX3799 toc32
4
μs/div
V
BIAS
FAULT
DISABLE
OUTPUT
LOW
LOW
HIGH
EXTERNAL
FAULT
HIGH
FREQUENCY ASSERTION OF DISABLE
MAX3799 toc33
4
μs/div
V
BIAS
FAULT
DISABLE
OUTPUT
LOW
LOW
HIGH
HIGH
EXTERNALLY
FORCED FAULT
Tx INPUT RETURN LOSS
MAX3799 toc34
FREQUENCY (Hz)
SDD11 (dB)
10G
1G
-50
-40
-30
-20
-10
0
-60
100M
100G
Tx OUTPUT RETURN LOSS
MAX3799 toc35
FREQUENCY (Hz)
SDD22 (dB)
10G
1G
-40
-35
-30
-25
-20
-15
-10
-5
0
-45
100M
100G