DS1856B-M50+R datasheet(1/28 Pages) MAXIM

Part #	DS1856B-M50+R

Description	Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual, Temperature-Controlled Resistors with

Calibrated Monitors and Password Protection

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.

General Description

The DS1856M dual, temperature-controlled, nonvolatile

(NV) variable resistors with three monitors consists of

two 256-position, linear, variable resistors; three analog

monitor inputs (MON1, MON2, MON3); and a direct-to-

digital temperature sensor. The device provides an

ideal method for setting and temperature-compensating

bias voltages and currents in control applications using

minimal circuitry. The variable resistor settings are

stored in EEPROM memory and can be accessed over

the 2-wire serial bus.

The DS1856M includes 128 bytes of EEPROM memory

at A2h slave address, Table 00/01. The DS1856M also

includes three-levels of password protection. The

DS1856-01 includes 256 bytes of A0h EEPROM memo-

ry. The DS1856B-M50+ and DS1856E-M50+ are drop-

in replacements for the DS1856B-050+ and

DS1866E-050+, respectively. The enhancements

include 256 bytes of EEPROM at A0h; selectable

MON2, MON3 references; and a 13-bit ADC. These are

backward

compatible

by

default

with

the

DS1856B-050+/DS1856E-050+.

Applications

Optical Transceivers

Optical Transponders

Instrumentation and Industrial Controls

RF Power Amps

Diagnostic Monitoring

Features

♦ SFF-8472 Compatible

♦ 13-Bit ADC

♦ Two Linear, 256-Position, Nonvolatile

Temperature-Controlled Variable Resistors with

2°C Resolution

♦ Three Levels of Security

♦ Access to Monitoring and ID Information

Configurable with Separate Device Addresses

♦ 2-Wire Serial Interface

♦ Two Buffers with TTL/CMOS-Compatible Inputs

and Open-Drain Outputs

♦ Operates from a 3.3V or 5V Supply

♦ -40°C to +95°C Operating Temperature Range

19-6395; Rev 0; 7/12

EVALUATION

KIT

AVAILABLE

SDA

1

2

3

4

5

6

7

8

16

0.1

μF

15

14

13

12

11

10

9

SCL

OUT1

IN1

OUT2

IN2

N.C.

GND

VCC

H1

L1

H0

L0

MON3

MON2

MON1

Rx POWER*

DIAGNOSTIC

INPUTS

TO LASER

MODULATION

CONTROL

TO LASER BIAS

CONTROL

DECOUPLING

CAPACITOR

Tx POWER*

Tx BIAS*

*SATISFIES SFF-8472 COMPATIBILITY

VCC

VCC = 3.3V

4.7k

Ω

4.7k

Ω

Tx-FAULT

LOS

2-WIRE

INTERFACE

DS1856M

Typical Operating Circuit

Ordering Information appears at end of data sheet.

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DS1856B-M50+R Datasheet(PDF) 1 Page - Maxim Integrated Products

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