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PDF DS1864 Data sheet ( Hoja de datos )
| Número de pieza | DS1864 | |
| Descripción | SFP Laser Controller and Diagnostic IC | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 4/06
SFP Laser Controller and
Diagnostic IC
General Description
The DS1864 is an SFF-8472 multisource agreement
(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, VCC,
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.
Applications
SFP Optical Transceiver Modules
Laser Control and Monitoring
Features
♦ SFF-8472 MSA Compatible
♦ Five Monitored Channels (Temperature, VCC,
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)
♦ I2C-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)
Pin Configuration
TOP VIEW
28 27 26 25 24 23 22
RSELOUT 1
SDA 2
SCL 3
INTX-F 4
INLOS 5
IN1 6
N.C. 7
DS1864
21 VCC
20 DAC0
19 GND
18 DAC1
17 MON1P
16 MON1N
15 N.C.
8 9 10 11 12 13 14
Ordering Information
PART
DS1864T
DS1864T+
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
+Denotes lead-free only package.
PIN-PACKAGE
28 TQFN (5mm x 5mm)
28 TQFN (5mm x 5mm)
*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 com-
ponents in an I2C system, provided that the system conforms to
the I2C Standard Specification as defined by Philips.
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.
1 page  
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SFP Laser Controller and
Diagnostic IC
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.97V to 5.5V, TA = -40°C to +95°C.)
PARAMETER
SYMBOL
CONDITIONS
TIMING FOR SOFT CONTROL AND STATUS FUNCTIONS
TX-D Assert Time
tOFF
Time from TX-D set until DACs fall below
10% of nominal (Notes 13, 17)
TX-D Deassert time
tON
Time from TX-D cleared until DACs rise
above 90% of nominal (Notes 13, 17)
Time to Initialize, Including
Reset of TX-F
Time from power-on or negation of TX-F
tINIT using TX-D;
serial communication possible
TX-F Assert Time
RX-LOS Assert Time
tFAULT
tLOS_ON
Time from fault to TX-F set (Note 17)
Time from occurrence of loss of signal to
RX-LOS set
RX-LOS Deassert Time
tLOS_OFF
Time from occurrence of presence of signal
to RX-LOS cleared
Rate-Select Change Time
tRATE_SEL
Time from change of state of rate-select bit
to rate-select output (RSELOUT) pin change
MIN
TYP MAX UNITS
10 ms
50 ms
200 ms
50 ms
50 ms
50 ms
50 ms
I2C AC ELECTRICAL CHARACTERISTICS
(VCC = 2.97V to 5.5V; TA = -40°C to +95°C, timing referenced to VIL(MAX) and VIH(MIN).) (See Figure 19)
PARAMETER
SCL Clock Frequency
Bus Free Time Between Stop and
Start Conditions
SYMBOL
fSCL (Note 14)
tBUF
CONDITIONS
MIN
0
1.3
Hold Time (Repeated) Start
Condition
tHD:STA
0.6
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
Start Setup Time
SDA and SCL Rise Time
tLOW
tHIGH
tHD:DAT
tSU:DAT
tSU:STA
tR
(Note 15)
1.3
0.6
0
100
0.6
20 +
0.1CB
SDA and SCL Fall Time
Stop Setup Time
SDA and SCL Capacitive
Loading
EEPROM Write Time
tF (Note 15)
tSU:STO
CB (Note 15)
tW (Note 16)
20 +
0.1CB
0.6
TYP
10
MAX
400
UNITS
kHz
µs
µs
µs
µs
0.9 µs
ns
µs
300 ns
300 ns
µs
400 pF
20 ms
_____________________________________________________________________ 5
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SFP Laser Controller and
Diagnostic IC
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = 25°C, unless otherwise noted.)
DAC 0 DNL (LSB)
1.0
0.8 1.5mA MODE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0 25 50 75 100 125 150 175 200 225 250
SETTING (DEC)
DAC 1 INL (LSB)
1.0
0.8 0.5mA MODE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0 25 50 75 100 125 150 175 200 225 250
SETTING (DEC)
DAC 1 DNL (LSB)
1.0
0.8 0.5mA MODE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0 25 50 75 100 125 150 175 200 225 250
SETTING (DEC)
DAC 1 INL (LSB)
1.0
0.8 1.5mA MODE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0 25 50 75 100 125 150 175 200 225 250
SETTING (DEC)
DAC 1 DNL (LSB)
1.0
0.8 1.5mA MODE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0 25 50 75 100 125 150 175 200 225 250
SETTING (DEC)
DAC SETTING vs. POWER-UP VOLTAGE
0.50
DAC 0, 0.5mA
0.40
PROGRAMMED DAC
SETTING (80h)
0.30
0.20
0.10
0
012345
POWER-UP VOLTAGE (V)
DAC 0 CURRENT vs. SUPPLY VOLTAGE
1.00
DAC 0, 0.5mA
0.80
PROGRAMMED DAC
SETTING (FFh)
0.60
0.40
DAC 0 CURRENT vs. SUPPLY VOLTAGE
2.0
DAC 0, 1.5mA
1.6
1.2 PROGRAMMED DAC
SETTING (FFh)
0.8
DAC 1 CURRENT vs. SUPPLY VOLTAGE
1.00
DAC 1, 0.5mA
0.80
0.60
PROGRAMMED DAC
SETTING (FFh)
0.40
0.20 0.4 0.20
0.00
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
0
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
0.00
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS1864.PDF ] | |
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