DS1875 datasheet(1/92 Pages) MAXIM

Part #	DS1875

Description	PON Triplexer and SFP Controller

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Manufacturer	MAXIM [Maxim Integrated Products]

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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

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

________________________________________________________________

Maxim Integrated Products

1

TOP VIEW

TQFN

(5mm

× 7mm × 0.8mm)

13

14

15

16

17

18

19

MON5/D0

MON6/D1

MON7/D2

MON8/D3

MON1

MON2

MON4

38

37

36

35

34

33

32

1

2

3

4567

89

10

11

12

N.C.

VCC

SW

GND

31

30

29

28

27

26

25

24

23

22

21

20

+

*EP

*EXPOSED PAD.

DS1875

Pin Configuration

Ordering Information

Rev 1; 10/08

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.

+

Denotes a lead-free/RoHS-compliant package.

T&R = Tape and reel.

*

EP = Exposed pad.

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*

PON Triplexer and SFP Controller

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