MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.85V to 3.63V, T
A
= -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω, C
AZ
= 1nF, transmitter out-
put load is AC-coupled to differential 100Ω (see Figure 1), typical values are at +25°C, V
CC
= 3.3V, I
BIAS
= 6mA, I
MOD
= 6mA, unless
otherwise specified. Registers are set to default values unless otherwise noted, and the 3-wire interface is static during measure-
ments. For testing, the RATE_SEL bit was used and the RSEL pin was left open.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Tx INPUT SPECIFICATIONS
Data rate = 1.0625Gbps 0.2 2.4
Differential Input Voltage V
IN
Data rate = 10.32Gbps 0.075 0.8
V
P-P
Common-Mode Input Voltage V
INCM
2.75 V
Differential Input Resistance R
IN
75 100 125
DUT is powered on, f 5GHz 15
Input Return Loss SDD11
DUT is powered on, f 16GHz 6
dB
DUT is powered on, 1GHz < f 5GHz 9
Input Return Loss SCC11
DUT is powered on, 1GHz < f 16GHz 5
dB
Tx LASER MODULATOR
Maximum Modulation-On
Current into 100 Differential
Load
I
MODMAX
Outputs AC-coupled, V
CCTO
2.95V 12 mA
Minimum Modulation-On Current
into 100 Differential Load
I
MODMIN
Outputs AC-coupled 2 mA
Modulation Current DAC
Stability
2mA I
MOD
12mA (Note 8) 4 %
Modulation Current Rise Time/
Fall Time
t
R
/t
F
5mA I
MOD
10mA, 20% to 80%,
SET_TXDE[3:0] = 10 (Notes 2, 4)
26 39 ps
5mA I
MOD
12mA, at 10.32Gbps,
250mV
P-P
V
IN
800mV
P-P
,
SET_TXDE[3:0] = 0
6 12
5mA I
MOD
12mA, at 10.32Gbps,
250mV
P-P
V
IN
800mV
P-P
,
SET_TXDE[3:0] = 10
6 13
5mA I
MOD
12mA, at 8.5Gbps,
250mV
P-P
V
IN
800mV
P-P
,
SET_TXDE[3:0] = 0
6 12
5mA I
MOD
12mA, at 8.5Gbps,
250mV
P-P
V
IN
800mV
P-P
,
SET_TXDE[3:0] = 10
6 12
2mA I
MOD
12mA, at 4.25Gbps 5
Deterministic Jitter (Notes 2, 9) DJ
2mA I
MOD
12mA, at 1.0625Gbps 5
ps
Random Jitter
5mA I
MOD
12mA, 250mV
P-P
V
IN
800mV
P-P
0.17 0.5 ps
RMS
DUT is powered on, f 5GHz 12
Output Return Loss SDD22
DUT is powered on, f 16GHz 5
dB
Tx BIAS GENERATOR
Maximum Bias-On Current I
BIASMAX
Current into BIAS pin 15 mA
Minimum Bias-On Current I
BIASMIN
Current into BIAS pin 2 mA
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