Datasheet

_______________________________________________________________________________________ 3
MAX3946
1Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.85V to +3.63V, T
A
= -40°C to +85°C, and Figure 1. Guaranteed by design and characterization from T
A
= -40°C to +95°C.
Typical values are at V
CC
= +3.3V, I
BIAS
= 60mA, I
MOD
= 40mA, 25I differential output load, and T
A
= +25°C, unless otherwise
noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Minimum Bias Current I
BIASMIN
Current into BIAS pin, DISABLE = low, and
TX_EN = high
5 mA
Bias-Off Current I
BIAS-OFF
Current into BIAS pin, DISABLE = high or
TX_EN = low or SET_IBIAS[8:0] = H0x00;
BIAS pin voltage at V
CC
100
FA
Bias Current DAC Stability
5mA P I
BIAS
P 80mA, V
BIAS
= V
CC
- 1.5V
(Notes 2, 4)
1 3 %
Instantaneous Compliance
Voltage at BIAS
V
BIAS
0.9 1.5 2.1 V
BMON Current Gain G
BMON
G
BMON
= I
BMON
/I
BIAS
, external resistor to
ground defines voltage
9 10 11 mA/A
Compliance Voltage at BMON 0 1.8 V
BMON Current Gain Stability
5mA P I
BIAS
P 80mA (Notes 2, 4)
1.2 4 %
LASER MODULATOR
TOUT+ and TOUT-
Instantaneous Output
Compliance Voltage
V
CC
-
1.0
V
CC
+
1.0
V
Maximum Modulation Current I
MODMAX
Current into external 25I differential termi-
nation, output common-mode
voltage = V
CC
80
mA
P-P
Current into external 50I differential termi-
nation, output common-mode
voltage = V
CC
60
Minimum Modulation Current I
MODMIN
10 mA
P-P
Differential Output Resistance 2 x R
OUT
50
I
Modulation-Off Maximum Current I
MOD-OFF
Current between TOUT+ and TOUT- when
DISABLE = high or TX_EN = low or
SET_IMOD[8:0] = H0x00
100
FA
Modulation Current DAC Stability
10mA P I
MOD
P 80mA (Notes 2, 4)
1.5 3 %
Modulation Current Edge Speed
(Note 2)
t
R,
t
F
20% to 80%, 20mA P I
MOD
P 80mA
22 30
ps
20% to 80%, 10mA P I
MOD
P 80mA,
TXDE_MD[1:0] = 3d
22 30
Deterministic Jitter (Notes 2, 5) DJ
10mA P I
MOD
P 60mA, 11.3Gbps, output
differential load = 50I
5 12
ps
P-P
10mA P I
MOD
P 80mA, 11.3Gbps, output
differential load = 25I
5 12
10mA P I
MOD
P 80mA, 11.3Gbps, output
differential load = 5I
7
10mA P I
MOD
P 60mA, 10.7Gbps, output
differential load = 50I (K28.5 pattern)
5 10.5