Rainbow Electronics MAX3799 User Manual
Page 10
MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
10
______________________________________________________________________________________
Typical Operating Characteristics—Limiting Amplifier (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.)
OUTPUT EYE DIAGRAM AT 14.025Gbps
MAX3799 toc10
20ps/div
50mV/div
RATE_SEL = 1, RXDE_EN = 1
TRANSITION TIME
vs. INPUT AMPLITUDE
MAX3799 toc11
INPUT AMPLITUDE (mV
P-P
)
TRANSITION TIME (ps)
1000
800
600
400
200
10
20
30
40
50
60
70
0
0
1200
PATTERN = 00001111
20% TO 80%
RATE_SEL = 0, RXDE_EN = 0
RATE_SEL = 1, RXDE_EN = 0
RATE_SEL = 1, RXDE_EN = 1
LOS THRESHOLD vs. DAC SETTING
MAX3799 toc12
SET_LOS[5:0]
LOS THRESHOLD (mV)
56
49
35
42
14
21
28
7
20
40
60
80
100
120
140
160
180
0
0
63
DEASSERT
ASSERT
SENSITIVITY vs. DATA RATE
MAAX3799 toc13
DATA RATE (Gbps)
SENSITIVITY OMA (dBm)
9
7
5
3
-21
-20
-19
-18
-17
-16
-15
-14
-13
-12
-22
1
11
RATE_SEL = 1
RATE_SEL = 0
USING FINISAR ROSA
Rx INPUT RETURN LOSS
MAX3799 toc14
FREQUENCY (Hz)
SDD11 (dB)
10G
1G
-50
-40
-30
-20
-10
0
-60
100M
100G
Rx OUTPUT RETURN LOSS
MAX3799 toc15
FREQUENCY (Hz)
SDD22 (dB)
10G
1G
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-50
100M
100G
CML OUTPUT AMPLITUDE
vs. DAC SETTING
MAX3799 toc16
SET_CML[7:0]
CML OUTPUT AMPLITUDE (mV
P-P
)
250
200
150
100
50
200
400
600
800
1000
1200
1400
0
0
300
TOTAL SUPPLY CURRENT
vs. TEMPERATURE
MAX3799 toc17
TEMPERATURE (
°C)
SUPPLY CURRENT (mA)
80
65
35
50
-10
5
20
-25
50
60
70
80
90
100
110
120
130
140
40
-40
95
I
BIAS
= 12mA
I
BIAS
= 9mA
I
BIAS
= 2mA
I
MOD
= 2mA; RECEIVER OUTPUT = 400mV
P-P
;
TOTAL SUPPLY MEASURED USING THE SETUP
IN FIGURE 1
TOTAL SUPPLY CURRENT
vs. TEMPERATURE
MAX3799 toc18
TEMPERATURE (
°C)
SUPPLY CURRENT (mA)
80
65
35
50
-10
5
20
-25
50
60
70
80
90
100
110
120
130
140
150
160
40
-40
95
I
MOD
= 12mA
I
MOD
= 9mA
I
MOD
= 2mA
I
BIAS
= 2mA; RECEIVER OUTPUT = 400mV
P-P
;
TOTAL SUPPLY MEASURED USING THE SETUP
IN FIGURE 1