Rainbow Electronics MAX3798 - Manual (Page 10)

MAX3798
1.0625Gbps to 10.32Gbps, Integrated, Low-
Power SFP+ Limiting Amplifier and VCSEL Driver
10 ______________________________________________________________________________________
OUTPUT EYE DIAGRAM AT 4.25Gbps
MAX3798 toc10
50ps/div
100mV/div
MODE_SEL = 0, SLEW_RATE = 0
TRANSITION TIME vs. INPUT AMPLITUDE
MAX3798 toc11
INPUT AMPLITUDE (mV P-P )
TRANSITION TIME (ps)
1000 800 600 400 200
5
10
15
20
25
30
35
40
45
50
0
0 1200
MODE_SEL = 0, SLEW_RATE = 0, RXDE_EN = 0
MODE_SEL = 0, SLEW_RATE = 0, RXDE_EN = 1
MODE_SEL = X, SLEW_RATE = 1, RXDE_EN = 1
MODE_SEL = X, SLEW_RATE = 1, RXDE_EN = 0
PATTERN = 00001111,
DATA RATE = 8.5Gbps,
20% TO 80%
LOS THRESHOLD vs. DAC SETTING
MAX3798 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
MAX3798 toc13
DATA RATE (Gbps)
SENSITIVITY OMA (dBm)
10 8 6 4
-17
-16
-15
-14
-13
-12
-18
2 12
USING FINISAR ROSA
MODE_SEL = 1
MODE_SEL = 0
Rx INPUT RETURN LOSS
MAX3798 toc14
FREQUENCY (Hz)
SDD11 (dB)
10G 1G
-50
-40
-30
-20
-10
0
-60
100M 100G
Rx OUTPUT RETURN LOSS
MAX3798 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
MAX3798 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
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 MODE_SEL bit was
used and the MSEL pin was left open.)