User Manual
DS1862
XFP Laser Control and Digital Diagnostic IC
6 _____________________________________________________________________
AC ELECTRICAL CHARACTERISICS—SOFT* CONTROL AND STATUS
(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
Soft TX-D Assert Time t
OFF_Soft
IBIAS and IMOD below 10% of nominal 50 ms
Soft TX-D Deassert Time t
ON_Soft
IBIAS and IMOD above 90% of nominal 50 ms
Soft P-DOWN/RST Assert Time
t
PDR-ON_Soft
IBIAS and IMOD below 10% of nominal 50 ms
Soft P-DOWN/RST Deassert Time t
PDR-OFF_Soft
IBIAS and IMOD above 90% of nominal
200
ms
Soft MOD-NR Assert Delay
t
MOD-NR-ON
_Soft
Time from fault to MOD-NR assertion 50 ms
Soft MOD-NR Deassert Delay
t
MOD-NR-OFF
_Soft
Time from read (clear flags) to MOD-NR
deassertion
50 ms
Soft RX_LOS Assert Time
t
LOS-ON_Soft
Time from SC-RX-LOS assertion to
RX-LOS assertion
50 ms
Soft RX_LOS Deassert Time
t
LOS-OFF_Soft
Time from SC-RX-LOS deassertion to
RX-LOS deassertion
50 ms
Analog Parameter data Ready
(DATA-NR)
500
ms
*All SOFT timing specifications are measured from the falling edge of “STOP” signal during I
2
C communication.
ANALOG INPUT CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, T
A
= -40°C to +100°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
I
BMD
Configurable Source or
Sink (+/-)
0.05 1.50
mA
Source mode 2.0
I
BMD
Voltage (I
BMD
- 0µA) V
BMD
Sink mode
I
BMD
range 0 to 1.5mA
1.2
V
I
BMD
Input Resistance R
BMD
400 550
700
Ω
A/D INPUT VOLTAGE MONITORING (IBIASMON, AUX2MON, AUX1MON, RSSI, BMD)
(V
CC3
= +2.9V to +5.5V, T
A
= -40°C to +100°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Resolution ∆V
MON
610
µV
Supply Resolution
∆V
CC2/3
1.6 mV
Input/Supply Accuracy A
CC
At factory setting
0.25
0.5
%FS
t
FRAME1
AUX1MON and AUX2MON disabled 48 52
Update Rate
t
FRAME2
All channels enabled 64 75
ms
Input/Supply Offset V
OS
(Note 4) 0 5 LSB
Full-Scale Input (I
BIASMON
and
RSSI)
At factory setting
2.4875
2.5
2.5125
V
Full-Scale Input (AUX1MON,
AUX2MON, and V
CC2/3
)
At factory setting
(Note 9)
6.5208 6.5536 6.5864
V
BMD (Monitor) (TX-P) FS setting 1.5 mA