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Maxim Integrated Products - PON Triplexer and SFP Controller

Numéro de référence DS1875
Description PON Triplexer and SFP Controller
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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DS1875 fiche technique
Rev 1; 10/08
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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.

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