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DS1875RT-TR

Categoryunclassified   
File Size1MB,92 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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Parameter NameAttribute value
Product CategoryMaxim
ManufacturerMaxim
Rev 1; 10/08
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 V
CC
, 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.
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, V
CC
,
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
I
2
C-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
DS1875
Applications
BPON, GPON, or EPON Optical Triplexers
SFF, SFP, and SFP+ Transceiver Modules
APD Controller
Ordering Information
PART
DS1875T+
DS1875T+T&R
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
PIN-PACKAGE
38 TQFN-EP*
38 TQFN-EP*
+Denotes
a lead-free/RoHS-compliant package.
T&R = Tape and reel.
*EP
= Exposed pad.
Pin Configuration
COMP
DAC1
MOD
BMD
BIAS
GND
TOP VIEW
V
CC
MON3N
MON3P
M4DAC
31 30 29 28 27 26 25 24 23 22 21 20
GND 32
GND 33
SW 34
V
CC
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
N.C.
13 MON5/D0
LOSI
FB
+
1
BEN
2
SDA
3
SCL
4
TX-F
5
N.C.
6
FETG
7
N.C.
8
TX-D
9
V
CC
GND
*EP
10 11 12
N.C.
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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