User guide

DS1875
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM-DAC Full-Scale Voltage V
PWM-DAC
1.25 V
PWM-DAC Resolution 8 Bits
V
PWM-DAC
Full-Scale Voltage
Error
T
A
= +25°C 1.25 %
V
PWM-DAC
Integral Nonlinearity -1 1 LSB
V
PWM-DAC
Differential
Nonlinearity
-1 1 LSB
V
PWM-DAC
Temperature Drift -2 +2 %FS
SW Output Impedance 20 
SW Frequency Error f
SWER
(Note 9) -5 +7 %
SW Duty Cycle D
MAX
89 90 91 %
Error-Amplifier Source Current -10 μA
Error-Amplifier Sink Current +10 μA
COMP High-Voltage Clamp 2.1 V
COMP Low-Voltage Clamp 0.8 V
Error-Amplifier
Transconductance
G
M
425 μS
Error-Amplifier Output
Impedance
R
EA
260 M
FB Pin Capacitance 5 pF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
First BMD Sample Following BEN t
FIRST
(Note 10)
Remaining Updates During BEN t
UPDATE
(Note 10)
BEN High Time t
BEN:HIGH
400 ns
BEN Low Time t
BEN:LOW
96 ns
Output-Enable Time Following POA t
INIT
10 ms
BIAS and MOD Turn-Off Delay t
OFF
5 μs
BIAS and MOD Turn-On Delay t
ON
5 μs
FETG Turn-On Delay t
FETG:ON
5 μs
FETG Turn-Off Delay t
FETG:OFF
5 μs
TIMING CHARACTERISTICS (CONTROL LOOP AND QUICK TRIP)
(V
CC
= +2.85V to +3.9V, T
A
= -40°C to +95°C, unless otherwise noted.)
PWM CHARACTERISTICS
(V
CC
= +2.85V to +3.9V, T
A
= -40°C to +95°C, unless otherwise noted.)
PON Triplexer and SFP Controller
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