DS1862 Datasheet PDF - Maxim Integrated Products
| Part Number | DS1862 | |
| Description | XFP Laser Control and Digital Diagnostic IC | |
| Manufacturers | Maxim Integrated Products | |
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Rev 0; 2/06
XFP Laser Control and Digital Diagnostic IC
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 I2C*-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
♦ I2C-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, VCC2/3, 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
♦ -40°C to +100°C Operating Temperature Range
♦ One 8-Bit Buffered DAC
TOP VIEW
A
1
B
C
D
E
Pin Configuration
2345
Ordering Information
PART
TEMP RANGE
DS1862B
-40°C to +100°C
DS1862B+ -40°C to +100°C
+Denotes lead-free package.
PIN-PACKAGE
25 CSBGA (5mm x 5mm)
25 CSBGA (5mm x 5mm)
CSBGA (5mm x 5mm)
Typical Operating Circuit appears at end of data sheet.
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
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.
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XFP Laser Control and Digital Diagnostic IC
ANALOG OUTPUT CHARACTERISTICS (continued)
(VCC3 = +2.9V to +5.5V, VCC2 = +1.6V to +3.6V, TA = -40°C to +100°C, unless otherwise noted.)
PARAMETER
IMODSET Accuracy
IMODSET DNL
IMODSET INL
IMODSET Temp Drift
IMODSET Voltage Drift
IMODSET FS Accuracy
APC Bandwidth
SYMBOL
CONDITIONS
+25°C
IMODSET = 0.04mA to 1.2mA
75µA range
150µA range
300µA range
600µA range
1200µA range
75µA range
150µA range
300µA range
600µA range
1200µA range
IMD / IAPC = 1 (Note 4)
MIN TYP MAX UNITS
-1.5
+1.5
%
-0.9 +0.9
-0.9 +0.9
-0.9 +0.9 LSB
-0.9 +0.9
-0.9 +0.9
-1.5 +1.5
-1.5 +1.5
-1.0 +1.0 LSB
-1.0 +1.0
-1.0 +1.0
5%
1.2 %/V
1.5 %
6 10 30 kHz
AC ELECTRICAL CHARACTERISICS—XFP CONTROLLER
(VCC3 = +2.9V to +5.5V, VCC2 = +1.6V to +3.6V, TA = -40°C to +100°C, unless otherwise noted.)
PARAMETER
Time to Initialize
TX-D Assert Time
TX-D Deassert Time
P-DOWN/RST Assert Time
P-DOWN/RST Deassert Time
MOD-DESEL Deassert Time
INTERRUPT Assert Delay
INTERRUPT Deassert Delay
MOD-NR Assert Delay
MOD-NR Deassert Delay
RX-LOS Assert Time
RX-LOS Deassert Time
P-DOWN/RST Reset Time
Shutdown Time
SYMBOL
CONDITIONS
tINIT VCC3 within ±5% of nominal
tOFF
tON
IBIAS and IMOD below 10% of nominal
IBIAS and IMOD above 90% of nominal
tPDR-ON IBIAS and IMOD below 10% of nominal
tPDR-OFF
tMOD-DESEL
IBIAS and IMOD above 90% of nominal
Time until proper response to I2C
communication
tINT-ON
tINT-OFF
Time from fault to interrupt assertion
Time from read (clear flags) to interrupt
deassertion
tMOD-NR-ON Time from fault to MOD-NR assertion
tMOD-NR-OFF
Time from read (clear flags) to MOD-NR
deassertion
tLOS-ON
Time from SC-RX-LOS assertion to
RX-LOS assertion
tLOS-OFF
Time from SC-RX-LOS deassertion to
RX-LOS deassertion
tRESET
Time from P-DOWN/RST assertion to
initial reset
tFAULT
Time from fault to IBIASSET, IMODSET,
and IBMD below 10%
MIN
30
10
TYP
MAX
200
5
1
100
200
2
100
500
0.5
0.5
UNITS
ms
µs
ms
µs
ms
ms
ms
µs
ms
ms
100 ns
100 ns
µs
30 µs
_____________________________________________________________________ 5
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