(MSA)-compliant laser controller/monitor that is ideal for
SFP optical-transceiver module designs. It controls laser
driver bias and modulation currents through a pair of tem-
perature-controlled current-sink DACs. System diagnos-
tics are provided by monitoring three analog inputs, V
CC
,
and temperature through the internal temperature sensor.
The device also contains all EEPROM required by the
SFF-8472 MSA, including all A0h and A2h EEPROM. The
DS1864’s memory map can be configured to be compati-
ble with both the DS1852/DS1856 and the DS1859 mem-
ory maps. Additionally, memory is secured with customer-
configurable two-level password protection.
Eye-safety features are integrated by three fast-trip
comparators that monitor transmit-power high, transmit-
power low, and bias current. The fast-trip comparators
drive a FET driver output to disable the laser in the case
of eye safety violation.
With its integrated laser driver control, system diagnos-
tics, eye-safety features, and internal temperature sen-
sor, the DS1864 provides an ideal solution for SFP
optical transceiver modules by improving system perfor-
mance, reducing board space, and simplifying design.
Features
♦
SFF-8472 MSA Compatible
♦
Five Monitored Channels (Temperature, V
CC
,
MON1, MON2, MON3)
Three External Analog Inputs (MON1, MON2,
MON3) Support Internal and External
Calibration
Enhanced RSSI Monitoring (26dB Range, 0.5dB
Accuracy)
Scalable Dynamic Range for External Analog
Inputs
Internal Direct-to-Digital Temperature Sensor
Alarm and Warning Flags for All Monitored
Channels
♦
Two Linear 8-Bit Current-Sink DACs
Two User-Selectable Full-Scale Ranges (0.5mA
or 1.5mA)
Values Changeable Every 2°C
♦
Three Fast-Trip Comparators (Tx Power High,
Tx Power Low, and Bias Current) for Eye Safety
♦
Flexible, Two Level Password Scheme Provides
Three Levels of Security
♦
Provides All Optional and Required SFF-8472
MSA EEPROM (Both A0h and A2h Memory)
♦
I
2
C-Compatible Serial Interface
♦
Operates from a 3.3V or 5V Supply
♦
-40°C to +95°C Operating Temperature Range
♦
28-Pin TQFN Package (5mm x 5mm)
DS1864
Applications
SFP Optical Transceiver Modules
Laser Control and Monitoring
Pin Configuration
RX-LOS
OUT1
FETG
Ordering Information
PART
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
PIN-PACKAGE
28 TQFN (5mm x 5mm)
28 TQFN (5mm x 5mm)
DS1864T
DS1864T+
TOP VIEW
V
CC
28
RSELOUT
SDA
SCL
INTX-F
INLOS
IN1
N.C.
1
2
3
4
5
6
7
8
N.C.
TX-F
GND
23
27
26
25
24
22
21
20
19
V
CC
DAC0
GND
DAC1
MON1P
MON1N
N.C.
N.C.
+Denotes
lead-free only package.
DS1864
18
17
16
15
9
GND
10
TX-D
11
RSEL
12
MON3N
13
MON3P
14
MON2
Typical Operating Circuit appears at end of data sheet.
TQFN
5mm x 5mm
______________________________________________
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.
SFP Laser Controller and
Diagnostic IC
DS1864
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Relative to Ground ...........-0.5V to +6.0V
Voltage Range on Inputs Relative to Ground* .................-0.5V to
(V
CC
+ 0.5V)
Voltage Range on DAC Pins Relative to Ground*............-0.5V to
(V
CC
+ 0.5V)
*Not
to exceed 6.0V.
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.
Current into DAC Pins ...........................................................5mA
Operating Temperature Range ...........................-40°C to +95°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
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Test/Measurement
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