Electrical characteristics (continued) – Rainbow Electronics MAX3798 User Manual
Page 5
MAX3798
1.0625Gbps to 10.32Gbps, Integrated, Low-
Power SFP+ Limiting Amplifier and VCSEL Driver
_______________________________________________________________________________________
5
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 100
Ω, C
AZ
= 1nF, transmitter out-
put load is AC-coupled to differential 100
Ω (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 MODE_SEL bit was used and the MSEL pin was left open.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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
BIAS Current DAC Stability
2mA
I
BIAS
15mA (Notes 2, 10)
4
%
Compliance Voltage at BIAS
V
BIAS
0.9
2.1
V
BIAS Current Monitor Current
Gain
I
BMON
External resistor to GND defines the
voltage gain
16
mA/A
Compliance Voltage at BMON
V
BMON
0
1.8
V
BIAS Current Monitor Current
Gain Stability
I
BMON
2mA
I
BIAS
15mA (Note 10)
5
%
Tx SAFETY FEATURES
Excessive Voltage at BMAX
V
BMAX
Average voltage, FAULT always occurs for
V
BMAX
V
CC
- 0.65V, FAULT never occurs
for V
BMAX
V
CC
- 0.55V
V
CC
-
0.65V
V
CC
-
0.6V
V
CC
-
0.55V
V
Excessive Voltage at MMAX
V
MMAX
Average voltage, FAULT always occurs for
V
MMAX
V
CC
- 0.65V, FAULT never occurs
for V
MMAX
V
CC
- 0.55V
V
CC
-
0.65V
V
CC
-
0.6V
V
CC
-
0.55V
V
Excessive Voltage at BMON
V
BMON
Average voltage, FAULT warning always
occurs for V
BMON
V
CC
- 0.55V, FAULT
warning never occurs for V
BMON
V
CC
-
0.65V
V
CC
-
0.65V
V
CC
-
0.6V
V
CC
-
0.55V
V
Excessive Voltage at BIAS
V
BIAS
Average voltage, FAULT always occurs for
V
BIAS
0.44V, FAULT never occurs for
V
BIAS
0.65V
0.44 0.48 0.65 V
Maximum VCSEL Current in Off
State
I
OFF
FAULT or DISABLE, V
BIAS
= V
CC
25
μA
SFP TIMING REQUIREMENTS
Mode-Select Change Time
t_
MODESEL
Time from rising or falling edge at MSEL
until Rx output PWD falls below 10ps
10
μs
DISABLE Assert Time
t_
OFF
Time from rising edge of DISABLE input
signal to I
BIAS
= I
BIASOFF
and I
MOD
=
I
MODOFF
1
μs