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PDF DS1875 Data sheet ( Hoja de datos )
| Número de pieza | DS1875 | |
| Descripción | PON Triplexer and SFP Controller | |
| Fabricantes | Maxim Integrated Products | |
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Rev 1; 10/08
www.DataSheet4U.com
PON Triplexer and SFP Controller
General Description
The DS1875 controls and monitors all functions for burst-
mode transmitters, APD receivers, and video receivers.
It also includes a power-supply controller for APD bias
generation, and provides all SFF-8472 diagnostic and
monitoring functionality. The combined solution of the
DS1875 and the MAX3643 laser driver provides APC
loop, modulation current control, and eye safety func-
tionality. Ten ADC channels monitor VCC, temperature
(both internal signals), and eight external monitor inputs
(MON1–MON8) that can be used to meet transmitter,
digital receiver, video receiver, and APD receiver-signal
monitoring requirements. Four total DAC outputs are
available. A PWM controller with feedback and compen-
sation pins can be used to generate the bias for an APD
or as a step-down converter. Five I/O pins allow addi-
tional monitoring and configuration.
Applications
BPON, GPON, or EPON Optical Triplexers
SFF, SFP, and SFP+ Transceiver Modules
APD Controller
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1875T+
-40°C to +95°C
38 TQFN-EP*
DS1875T+T&R
-40°C to +95°C
38 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
31 30 29 28 27 26 25 24 23 22 21 20
GND 32
GND 33
SW 34
VCC 35
N.C. 36
N.C. 37
N.C. 38
+
DS1875
19 MON4
18 MON2
17 MON1
16 MON8/D3
15 MON7/D2
14 MON6/D1
*EP 13 MON5/D0
1 2 3 4 5 6 7 8 9 10 11 12
Features
♦ Meets All PON Burst-Timing Requirements for
Burst-Mode Operation
♦ Laser Bias Controlled by APC Loop and
Temperature Lookup Table (LUT)
♦ Laser Modulation Controlled by Temperature LUT
♦ Six Total DACs: Four External, Two Internal
♦ Two 8-Bit DACs, One of Which is Optionally
Controlled by MON4 Voltage
♦ Internal 8-Bit DAC Controlled by a Temperature-
Indexed LUT
♦ PWM Controller
♦ Boost or Buck Mode
♦ Boost Mode: Uses Optional External
Components, Up to 90V Bias Generation
♦ 131kHz, 262kHz, 525kHz, or 1050kHz Selectable-
Switching Frequency
♦ APD Overcurrent Protection Using Optional Fast
Shutdown
♦ 10 Analog Monitor Channels: Temperature, VCC,
Eight Monitors
♦ Internal, Factory-Calibrated Temperature Sensor
♦ RSSI with 29dB Electrical Dynamic
♦ Five I/O Pins for Additional Control and
Monitoring Functions, Four of Which are Either
Digital I/O or Analog Monitors
♦ Comprehensive Fault-Measurement System with
Maskable Laser Shutdown Capability
♦ Two-Level Password Access to Protect
Calibration Data
♦ 120 Bytes of Password-1 Protected Memory
♦ 128 Bytes of Password-2 Protected Memory in
Main Device Address
♦ 256 Additional Bytes Located at A0h Slave
Address
♦ I2C-Compatible Interface for Calibration and
Monitoring
♦ 2.85V to 3.9V Operating Voltage Range
♦ -40°C to +95°C Operating Temperature Range
♦ 38-Pin TQFN (5mm x 7mm) Package
TQFN
(5mm × 7mm × 0.8mm)
*EXPOSED PAD.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
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PON Triplexer and SFP Controller
ABSOLUTE MAXIMUM RATINGS
Voltage Range on MON1–MON8,
BEN, BMD, and TX-D Pins
Relative to Ground .................................-0.5V to (VCC + 0.5V)*
Voltage Range on VCC, SDA, SCL,
D0–D3, and TX-F Pins Relative to Ground...............-0.5V to 6V
Operating Temperature Range ...........................-40°C to +95°C
Programming Temperature Range .........................0°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
*Subject to not exceeding +6V.
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.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +95°C, unless otherwise noted.)
PARAMETER
Main Supply Voltage
High-Level Input Voltage
(SDA, SCL, BEN)
SYMBOL
VCC (Note 1)
VIH:1
CONDITIONS
Low-Level Input Voltage
(SDA, SCL, BEN)
VIL:1
High-Level Input Voltage
(TX-D, LOSI, D0, D1, D2, D3)
VIH:2
Low-Level Input Voltage
(TX-D, LOSI, D0, D1, D2, D3)
VIL:2
MIN
+2.85
0.7 x
VCC
-0.3
2.0
-0.3
TYP
MAX
+3.9
VCC +
0.3
0.3 x
VCC
VCC +
0.3
UNITS
V
V
V
V
+0.8
V
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.85V to +3.9V, TA = -40°C to +95°C, unless otherwise noted.)
PARAMETER
Supply Current
Output Leakage
(SDA, TX-F, D0, D1, D2, D3)
Low-Level Output Voltage
(SDA, TX-F, FETG, D0, D1, D2, D3)
High-Level Output Voltage
(FETG)
FETG Before Recall
SYMBOL
ICC (Notes 1, 2)
ILO (Note 2)
VOL IOL = 4mA
IOL = 6mA
VOH
IOH = 4mA
(Note 3)
CONDITIONS
Input Leakage Current
(SCL, BEN, TX-D, LOSI)
Digital Power-On Reset
Analog Power-On Reset
ILI:1
POD
POA
MIN
VCC -
0.4
1.0
2.1
TYP
5.5
10
MAX
10
UNITS
mA
1 μA
0.4
V
0.6
V
100 nA
1 μA
2.2 V
2.75 V
_______________________________________________________________________________________ 5
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PON Triplexer and SFP Controller
Typical Operating Characteristics (continued)
(VCC = +2.85V to +3.9V, TA = +25°C, unless otherwise noted.)
CALCULATED AND DESIRED % CHANGE
IN VMOD vs. MOD RANGING
100
90
80 DESIRED
VALUE
70
60 CALCULATED
VALUE
50
40
30
20
10
0
000 001 002 003 004 005 006 007
MOD RANGING VALUE (DEC)
DESIRED AND CALCULATED CHANGE
IN VBMD vs. COMP RANGING
100
90
80 DESIRED
VALUE
70
60 CALCULATED
VALUE
50
40
30
20
10
0
000 001 010 011 100 101 110 111
COMP RANGING (DEC)
MON1 TO MON8 INL
1.0
USING FACTORY-PROGRAMMED
0.8 FULL-SCALE VALUE OF 2.5V
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
0.5 1.0 1.5 2.0
MON1 TO MON8 INPUT VOLTAGE (V)
2.5
MON1 TO MON8 DNL
1.0
USING FACTORY-PROGRAMMED
0.8 FULL-SCALE VALUE OF 2.5V
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
0.5 1.0 1.5 2.0
MON1 TO MON8 INPUT VOLTAGE (V)
2.5
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
VBMD INL vs. APC INDEX
50 100 150 200
APC INDEX (DEC)
250
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
VMOD INL vs. MOD INDEX
50 100 150 200
MOD INDEX (DEC)
250
FB VOLTAGE vs. TEMPERATURE
PWM DAC = FFh
1.260
1.255
1.250
1.245
1.240
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
77.0
76.8
76.6
76.4
76.2
76.0
75.8
75.6
75.4
75.2
75.0
2.85
VOUT vs. VCC
VIN = 3.3V
3.35
VCC (V)
DUTY-CYCLE LIMIT vs. TEMPERATURE
91.00
90.75
90.50
90.25
90.00
89.75
89.50
89.25
SW FREQUENCY
525kHz
262.5kHz
131.25kHZ
1050kHz
89.00
3.85 -40 -20 0 20 40 60 80
TEMPERATURE (°C)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet DS1875.PDF ] | |
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