User Manual

DS1862
XFP Laser Control and Digital Diagnostic IC
_____________________________________________________________________ 5
AC ELECTRICAL CHARACTERISICS—XFP CONTROLLER
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, T
A
= -40°C to +100°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Time to Initialize t
INIT
V
CC3
within ±5% of nominal 30 200 ms
TX-D Assert Time t
OFF
IBIAS and IMOD below 10% of nominal 5 µs
TX-D Deassert Time t
ON
IBIAS and IMOD above 90% of nominal 1 ms
P-DOWN/RST Assert Time t
PDR-ON
IBIAS and IMOD below 10% of nominal 100 µs
P-DOWN/RST Deassert Time
t
PDR-OFF
IBIAS and IMOD above 90% of nominal 200 ms
MOD-DESEL Deassert Time
t
MOD-DESEL
Time until proper response to I
2
C
communication
2ms
INTERRUPT Assert Delay t
INT-ON
Time from fault to interrupt assertion 100 ms
INTERRUPT Deassert Delay t
INT-OFF
Time from read (clear flags) to interrupt
deassertion
500 µs
MOD-NR Assert Delay
t
MOD-NR-ON
Time from fault to MOD-NR assertion 0.5 ms
MOD-NR Deassert Delay
t
MOD-NR-OFF
Time from read (clear flags) to MOD-NR
deassertion
0.5 ms
RX-LOS Assert Time t
LOS-ON
Time from SC-RX-LOS assertion to
RX-LOS assertion
100 ns
RX-LOS Deassert Time t
LOS-OFF
Time from SC-RX-LOS deassertion to
RX-LOS deassertion
100 ns
P-DOWN/RST Reset Time t
RESET
Time from P-DOWN/RST assertion to
initial reset
10 µs
Shutdown Time t
FAULT
Time from fault to I
BIASSET
, I
MODSET
,
and I
BMD
below 10%
30 µs
ANALOG OUTPUT CHARACTERISTICS (continued)
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, T
A
= -40°C to +100°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
I
MODSET
Accuracy
+25°C
I
MODSET
= 0.04mA to 1.2mA
-1.5 +1.5
%
75µA range
-0.9 +0.9
150µA range
-0.9 +0.9
300µA range
-0.9 +0.9
600µA range
-0.9 +0.9
I
MODSET
DNL
1200µA range
-0.9 +0.9
LSB
75µA range
-1.5 +1.5
150µA range
-1.5 +1.5
300µA range
-1.0 +1.0
600µA range
-1.0 +1.0
I
MODSET
INL
1200µA range
-1.0 +1.0
LSB
I
MODSET
Temp Drift 5%
I
MODSET
Voltage Drift 1.2 %/V
I
MODSET
FS Accuracy 1.5 %
APC Bandwidth I
MD
/ I
APC
= 1 (Note 4) 6 10 30 kHz