Datasheet

_______________________________________________________________________________________ 9
MAX3945
1.0625Gbps to 11.3Gbps,
SFP+ Dual-Path Limiting Amplifier
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25NC, unless otherwise noted. Registers are set to default values, unless otherwise noted, and the 3-wire interface
is static during measurements.)
ELECTRICAL EYE DIAGRAM AFTER 6in OF FR4
AND 72in OF CABLE WITH DEEMPHASIS (11.3Gbps K28.5, RATE_SEL = 1,
SET_CML[7:0] = 160d, RXDE_EN = 1, RXDE0 = 1, RXDE1 = 1)
MAX3945 toc25
20ps/div
80mV/div
ELECTRICAL EYE DIAGRAM AFTER 6in OF FR4
AND 72in OF CABLE WITH NO DEEMPHASIS (11.3Gbps K28.5,
RATE_SEL = 1, SET_CML[7:0] = 160d, RXDE_EN = 0)
MAX3945 toc24
20ps/div
100mV/div
TRANSIENT RESPONSE (10.3Gbps,
10 ONES 10 ZEROS PATTERN, SET_CML[7:0] = 92d)
MAX3945 toc23
TIME (ps)
800600400200
-0.20
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
0.25
-0.25
0 1000
A
C
D
B
A = 1.39dB, RXDE1 = 0, RXDE0 = 0
B = 2.12dB, RXDE1 = 0, RXDE0 = 1
C = 3.27dB, RXDE1 = 1, RXDE0 = 0
D = 4.37dB, RXDE1 = 1, RXDE0 = 1
OUTPUT COMMON-MODE RETURN GAIN (SCC22)
(INPUT POWER OF 0dBm, ENABLED)
MAX3945 toc22
FREQUENCY (GHz)
SCC22 (dB)
10
-30
-20
-10
0
-40
1 100
INPUT COMMON-MODE RETURN GAIN (SCC11)
(INPUT POWER OF 0dBm, ENABLED)
MAX3945 toc21
FREQUENCY (GHz)
SCC11 (dB)
10
-30
-20
-10
0
-40
1 100
OUTPUT RETURN GAIN (SDD22)
(INPUT POWER OF 0dBm, ENABLED)
MAX3945 toc20
FREQUENCY (GHz)
SDD22 (dB)
101
-30
-20
-10
0
-40
0 100
INPUT RETURN GAIN (SDD11)
(INPUT POWER OF 0dBm, ENABLED)
MAX3945 toc19
FREQUENCY (GHz)
SDD11 (dB)
101
-30
-20
-10
0
-40
0 100