MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
6 _______________________________________________________________________________________
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
Resolution 40 μA
Integral Nonlinearity INL 1mA I
BIAS
15mA ±1 LSB
Differential Nonlinearity DNL
1mA I
BIAS
15mA, guaranteed mono-
tonic at 8-bit resolution (SET_IBIAS[8:1])
±1
LSB
MODULATION CURRENT DAC (SET_IMOD)
Full-Scale Current I
FS
21 mA
Resolution 40 μA
Integral Nonlinearity INL 2mA I
MOD
12mA ±1 LSB
Differential Nonlinearity DNL
2mA I
MOD
12mA, guaranteed mono-
tonic at 8-bit resolution (SET_IMOD[8:1])
±1
LSB
CONTROL I/O SPECIFICATIONS
RSEL Input Current I
IH
, I
IL
150 μA
RSEL Input High Voltage V
IH
1.8 V
CC
V
RSEL Input Low Voltage V
IL
0 0.8 V
RSEL Input Impedance R
PULL
Internal pulldown resistor 40 75 110 k
I
IH
12
DISABLE Input Current
I
IL
Dependency on pullup resistance 420 800
μA
DISABLE Input High Voltage V
IH
1.8 V
CC
V
DISABLE Input Low Voltage V
IL
0 0.8 V
DISABLE Input Impedance R
PULL
Internal pullup resistor 4.7 8 10 k
LOS, FAULT Output High Voltage V
OH
R
LOS
= 4.7k - 10k to V
CC
,
R
FAULT
= 4.7k - 10k to V
CC
V
CC
-
0.5
V
CC
V
LOS, FAULT Output Low Voltage V
OL
R
LOS
= 4.7k - 10k to V
CC
,
R
FAULT
= 4.7k - 10k 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
, I
IH
V
IN
= 0V or V
CC
; internal pullup or pulldown
(75k typ)
150 μA
Output High Voltage V
OH
External pullup of 4.7k to V
CC
V
CC
-
0.5
V
Output Low Voltage V
OL
External pullup of 4.7k to V
CC
0.4 V
3-WIRE DIGITAL INTERFACE TIMING CHARACTERISTICS (See Figure 4)
SCL Clock Frequency f
SCL
400 1000 kHz
SCL Pulse-Width High t
CH
0.5 μs
SCL Pulse-Width Low t
CL
0.5 μs
(25 paginas)
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