DS1875 查看數據表（PDF） - Maxim Integrated

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DS1875

PON Triplexer and SFP Controller

Maxim Integrated 

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 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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