Datasheet

DS1878
SFP+ Controller with Digital LDD Interface
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ADC Resolution 13 Bits
Input/Supply Accuracy
(MON1–MON4, V
CC
)
ACC At factory setting 0.25 0.5 %FS
Sample Rate for Temperature,
MON1–MON4, and V
CC
t
RR
64 75 ms
Input/Supply Offset
(MON1–MON4, V
CC
)
V
OS
(Note 5) 0 5 LSB
MON1–MON4 2.5
V
CC
6.5536
V
Factory Setting Full-Scale
(Note 6)
MON3 Fine 312.5 μV
ANALOG VOLTAGE MONITORING CHARACTERISTICS
(V
CC
= +2.85V to +5.5V, T
A
= -40°C to +95°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MON2, TXP HI, TXP LO, HBIAS,
LOS Full-Scale Voltage
(Note 3) 1.25 V
MON2 Input Resistance 35 50 65 k
Resolution (Note 3) 8 Bits
Error T
A
= +25°C (Note 4) ±2 %FS
Integral Nonlinearity -1 +1 LSB
Differential Nonlinearity -1 +1 LSB
Temperature Drift -2.5 +2.5 %FS
ANALOG INPUT CHARACTERISTICS (MON2, TXP HI, TXP LO, HBIAS, LOS)
(V
CC
= +2.85V to +5.5V, T
A
= -40°C to +95°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Main Oscillator Frequency f
OSC
5 MHz
Delta-Sigma Input-Clock
Frequency
f
DS
1.25 MHz
Reference Voltage Input (REFIN) V
REFIN
Minimum 0.1μF to GND 2 V
CC
V
Output Range 0 V
REFIN
V
Output Resolution
See the Delta-Sigma Outputs (DAC1 and
DAC2) section for details
9 Bits
Output Impedance R
DS
35 100 
DAC1, DAC2 ELECTRICAL CHARACTERISTICS
(V
CC
= +2.85V to +5.5V, T
A
= -40°C to +95°C, unless otherwise noted.)