Datasheet

_______________________________________________________________________________________ 5
MAX3945
1.0625Gbps to 11.3Gbps,
SFP+ Dual-Path Limiting Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.85V to 3.63V, CML receiver output is AC-coupled to differential 100I load, C
CAZ
= 0.1FF, T
A
= -40NC to +85NC. Registers
are set to default values, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25NC, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT LEVEL VOLTAGE DAC (SET_CML)
Full-Scale Voltage V
FS
100I differential resistive load,
RXDE_EN = 0
1192
mV
P-P
100I differential resistive load,
RATE_SEL = 1, RXDE_EN = 1, RXDE1 = 1,
RXDE0 = 1 (maximum deemphasis)
828
Resolution
100I differential resistive load,
RXDE_EN = 0
4.5
mV
P-P
100I differential resistive load,
RATE_SEL = 1, RXDE_EN = 1, RXDE1 = 1,
RXDE0 = 1 (maximum deemphasis)
3.3
Integral Nonlinearity INL SET_CML[7:0] > 60d
Q0.9
LSB
LOS THRESHOLD VOLTAGE DAC (SET_LOS)
Full-Scale Voltage V
FS
LOS1_EN = 1, LOS2_EN = 0 96 mV
P-P
LOS1_EN = 0, LOS2_EN = 1 98 mV
Resolution
LOS1_EN = 1, LOS2_EN = 0 1.52 mV
P-P
LOS1_EN = 0, LOS2_EN = 1 1.56 mV
Integral Nonlinearity INL SET_LOS[5:0] > 3d
Q0.7
LSB
CONTROL I/O SPECIFICATIONS
LOS Output High Voltage V
OH
R
LOS
= 4.7kI to 10kI to V
CC
V
CC
-
0.5
V
CC
V
LOS Output Low Voltage V
OL
R
LOS
= 4.7kI to 10kI to V
CC
0 0.4 V
3-WIRE DIGITAL I/O SPECIFICATIONS (SDA, CSEL, SCL)
Input High Voltage V
IH
2.0 V
CC
V
Input Low Voltage V
IL
0.8 V
Input Hysteresis V
HYST
0.082 V
Input Leakage Current I
IL,IH
V
IN
= 0V or V
CC
, internal pullup or
pulldown (75kI typ)
85
FA
Output High Voltage V
OH
External pullup of 4.7kI to V
CC
V
CC
-
0.5
V
CC
V
Output Low Voltage V
OL
External pullup of 4.7kI to V
CC
0 0.4 V
3-WIRE DIGITAL INTERFACE TIMING CHARACTERISTICS (see Figure 5)
SCL Clock Frequency f
SCL
0 400 1000 kHz
SCL Pulse-Width High t
CH
500 ns
SCL Pulse-Width Low t
CL
500 ns
SDA Setup Time t
DS
100 ns
SDA Hold Time t
DH
100 ns
SCL Rise to SDA Propagation
Time
t
D
5 ns
CSEL Pulse-Width Low t
CSW
500 ns