Rainbow Electronics DS1874 - Manual (Page 6)

DS1874
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 0.50 %FS
Update Rate for Temperature,
MON1–MON4, and V
CC
t RR 64 75 ms
Input/Supply Offset
(MON1–MON4, V
CC )
V OS (Note 3) 0 5 LSB
MON1–MON4 2.5
V CC 6.5536
V
Factory Setting
MON3 Fine
(Note 4)
312.5 μV
ANALOG VOLTAGE MONITORING CHARACTERISTICS
(V CC = +2.85V to +3.9V, T A = -40°C to +95°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MON2, TXP HI, TXP LO Full-
Scale Voltage
V APC 2.5 V
HBIAS, LOS Full-Scale Voltage 1.25 V
MON2 Input Resistance 35 50 65 k
Resolution 8 Bits
Error T A = +25°C ±2 %FS
Integral Nonlinearity -1 +1 LSB
Differential Nonlinearity -1 +1 LSB
Temperature Drift -2.5 +2.5 %FS
LOS Offset -5 mV
ANALOG QUICK-TRIP CHARACTERISTICS
(V
CC
= +2.85V to +3.9V, 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 f OSC /2 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 +3.9V, T A = -40°C to +95°C, unless otherwise noted.)