General Description
The DS1862 is a closed-loop laser-driver control IC with
built-in digital diagnostics designed for XFP MSA. The
laser control function incorporates average power con-
trol (APC) and allows extinction ratio control though a
temperature indexed look-up table (LUT). The DS1862
monitors up to seven analog inputs, including tempera-
ture and monitor diode (MD) current, which are used to
regulate the laser bias current and extinction ratio.
Warning and alarm thresholds can be programmed to
generate an interrupt if monitored signals exceed toler-
ance. Calibration is also provided internally using inde-
pendent gain and offset scaling registers for each of
the monitored analog signals. Settings such as pro-
grammed calibration data are stored in password-pro-
tected EEPROM memory. Programming is accomplished
through an I
2
C*-compatible interface, which can also be
used to access diagnostic functionality.
Applications
Laser Control and Monitoring 10Gbps Optical
Transceiver Modules (XFP)
Laser Control and Monitoring
Digital Diagnostics in Optical Transmission
Features
Implements XFP MSA Requirements for Digital
Diagnostics, Serial ID, and User Memory
I
2
C-Compatible Serial Interface
Automatic Power Control (APC)
Extinction Ratio Control with Look-Up Table
Seven Monitored Channels for Digital Diagnostics
(Five Basic Plus Two Auxiliary)
Internal Calibration of Monitored Channels
(Temp, V
CC2/3
, Bias Current, Transmitted, and
Received Power)
Programmable Quick-Trip Logic for Turning
Off Laser for Eye Safety
Access to Monitoring and ID Information
Programmable Alarm and Warning Thresholds
Operates from 3.3V or 5V Supply
25-Pin CSBGA, 5mm x 5mm Package
Internal or External Temperature Sensor
-40C to +100C Operating Temperature Range
One 8-Bit Buffered DAC
DS1862
XFP Laser Control and Digital Diagnostic IC
______________________________________________ Maxim Integrated Products
1
CSBGA (5mm x 5mm)
TOP VIEW
1
A
B
C
D
E
2
3
4
5
Pin Configuration
Rev 0; 2/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
+Denotes lead-free package.
Ordering Information
Typical Operating Circuit appears at end of data sheet.
PART
TEMP RANGE
PIN-PACKAGE
DS1862B
-40C to +100C
25 CSBGA (5mm x 5mm)
DS1862B+
-40C to +100C
25 CSBGA (5mm x 5mm)
*Purchase of I
2
C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system conforms to the I
2
C
Standard Specification as defined by Philips.
DS1862
XFP Laser Control and Digital Diagnostic IC
2
_____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(V
CC3
= +2.9V to +5.5V, T
A
= -40C to +100C, unless otherwise noted.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage on Any Open-Drain Pin
Relative to Ground.............................................-0.5V to +6.0V
Voltage on MOD-DSEL, SDA, SCL, FETG, THRSET, TX-D,
AUX1MON, AUX2MON, IBIASMON,
RSSI, BIASSET, MODSET, EN1,
and EN2 ............-0.5V to (VCC3 + 0.5V), not to exceed +6.0V
Voltage on SC-RX-LOS, SC-RX-LOL, RX-LOS, SC-TX-LOS,
MOD-NR, EN1,
and EN2 ............-0.5V to (VCC2 + 0.5V), not to exceed +6.0V
Operating Temperature Range .........................-40C to +100C
EEPROM Programming Temperature Range .........0C to +70C
Storage Temperature Range .............................-55C to +125C
Soldering Temperature...................See J-STD-020 Specification
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Main Supply Voltage
V
CC3
(Note 1)
+2.9
+5.5
V
Secondary Supply Voltage
V
CC2
V
CC2
not to exceed V
CC3
(Note 2)
+1.6
+3.6
V
High-Level Input Voltage
(SDA, SCL)
V
IH
I
IH
(max) = 10A
0.7 x
V
CC3
V
CC3
+
0.5
V
Low-Level Input Voltage
(SDA, SCL)
V
IL
I
IL
(max) = -10A
GND -
0.3
0.3 x
V
CC3
V
High-Level Input Voltage
(TX-D, MOD-DESEL,
P-DOWN/RST) (Note 3)
V
IH
I
IH
(max) = 10A
2
V
CC3
+
0.3
V
Low-Level Input Voltage
(TX-D, MOD-DESEL,
P-DOWN/RST) (Note 3)
V
IL
I
IL
(max) = -10A
-0.3
+0.8
V
DS1862
XFP Laser Control and Digital Diagnostic IC
_____________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, T
A
= -40C to +100C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
I
CC3
P-DOWN/RST = 1
3
5
mA
High-Level Output Voltage
(FETG)
V
OH
I
OH
(max) = -2mA
V
CC3
-
0.5
V
Low-Level Output Voltage
(MOD-NR,
INTERRUPT, SDA,
and FETG)
V
OL
I
OL
(max) = 3mA
0
0.4
V
Resistor (Pullup)
R
PU
9
12
15
k
I/O Capacitance
C
I/O
(Note 4)
10
pF
Leakage Current
I
L
-10
+10
A
Leakage Current (SCL, SDA)
I
L
-10
+10
A
Digital Power-On Reset
POD
1.0
2.2
V
Analog Power-On Reset
POA
2.0
2.6
V
DC ELECTRICAL CHARACTERISTICS--INTERFACE SIGNALS TO SIGNAL CONDITIONERS
(V
CC2
= +1.6V to +3.6V, V
CC3
= +2.9V to +5.5V, T
A
= -40C to +100C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
High-Level Input Voltage
(SC-RX-LOS, SC-RX-LOL,
and SC-TX-LOS)
V
IH
I
IH
(max) = 100A
0.7 x
V
CC2
V
CC2
+
0.1
V
Low-Level Input Voltage
(SC-RX-LOS, SC-RX-LOL,
and SC-TX-LOS)
V
IL
I
IL
(max) = -100A
0
0.3 x
V
CC2
V
V
OH
I
OH
(max) = -0.7mA
V
CC2
-
0.2
V
OH2
V
CC2
= 2.5V to 3.6V
I
OH
(max) = -2mA
V
CC2
-
0.4
High-Level Output Voltage
(EN1 and EN2)
V
OH3
V
CC2
= 1.6V
I
OH
(max) = -0.7mA
V
CC2
-
0.2
V
V
OL
I
OL
(max) = 0.7mA
0.20
Low-Level Output Voltage
(EN1, EN2, and RX-LOS)
V
OL2
V
CC2
= 2.5V to 3.6V
I
OL
(max) = 2mA
0.40
V
Leakage Current
(SC-RX-LOS, SC-RX-LOL
and SC-TX-LOS, RX-LOS)
I
L
-10
+10
A
DS1862
XFP Laser Control and Digital Diagnostic IC
4
_____________________________________________________________________
I
2
C AC ELECTRICAL CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, T
A
= -40C to +100C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency
f
SCI
0
400
kHz
Clock Pulse-Width Low
t
LOW
1.3
s
Clock Pulse-Width High
t
HIGH
0.6
s
Bus Free Time between STOP
and START Conditions
t
BUF
1.3
s
Start Hold Time
t
HD:SDA
0.6
s
Start Setup Time
t
SU:SDA
0.6
s
Data in Hold Time
t
HD:DAT
0
0.9
s
Data in Setup Time
t
SU:DAT
100
ns
Rise Time of Both SDA and
SCL Signals
t
R
(Note 5)
20 +
0.1C
B
300
ns
Fall Time of Both SDA and
SCL signals
t
F
(Note 5)
20 +
0.1C
B
300
ns
STOP Setup Time
t
SU:STO
0.6
s
MOD-SEL Setup Time
t
H os t_sel e ct_set up
2
ms
MOD-SEL Hold Time
t
Host_select_hold
10
s
Aborted Sequence Bus Release
t
MOD-DE SEL_Ab ort
2
ms
C ap aci ti ve Load for E ach Bus Li ne
C
B
(Note 5)
400
pF
EEPROM Write Time
t
W
4-Byte write (Note 6)
16
ms
ANALOG OUTPUT CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, T
A
= -40C to +100C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
BIASSET
I
BIASSET
0.01
1.50
mA
I
BIASSET
(Off-State Current)
I
BIASSET
Shutdown
10
100
nA
I
MODSET
I
MODSET
0.01
1.20
mA
I
MODSET
(Off-State Current)
I
MODSET
Shutdown
10
100
nA
Voltage on I
BIASSET
and I
MODSET
V
MAX
(Note 7)
0.7
3.0
V
V
THRSET
V
THRSET
I
MAX
= 100A
50
1000
mV
V
THRSET
Drift
Across temperature (Note 8)
-5
+5
%
V
THRSET
Capacitance load
C
THRSET
1
nF
APC Calibration Accuracy
+25C
25
A
0.200mA to 1.5mA
-5
+5
%
APC Temp Drift
50A to 200A
12
A
Sink, SRC_SNK_B = 0
-0.9
+0.9
I
BMD
DNL
Source, SRC_SNK_B = 1
-0.9
+0.9
LSB
Sink, SRC_SNK_B = 0
-4.0
+4.0
I
BMD
INL
Source, SRC_SNK_B = 1
-4.0
+4.0
LSB
I
BMD
Voltage Drift
1.2
%/V
I
BMD
FS Accuracy
1.5
%
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
= -40C to +100C, 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
s
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
s
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
2
ms
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
s
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
s
Shutdown Time
t
FAULT
Time from fault to I
BIASSET
, I
MODSET
,
and I
BMD
below 10%
30
s
ANALOG OUTPUT CHARACTERISTICS (continued)
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, T
A
= -40C to +100C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
MODSET
Accuracy
+25C
I
MODSET
= 0.04mA to 1.2mA
-1.5
+1.5
%
75A range
-0.9
+0.9
150A range
-0.9
+0.9
300A range
-0.9
+0.9
600A range
-0.9
+0.9
I
MODSET
DNL
1200A range
-0.9
+0.9
LSB
75A range
-1.5
+1.5
150A range
-1.5
+1.5
300A range
-1.0
+1.0
600A range
-1.0
+1.0
I
MODSET
INL
1200A 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
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