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DS1841

Temperature-Controlled, NV, I

Logarithmic Resistor

Rev 0; 11/07

________________________________________________________________

Maxim Integrated Products

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 DS1841 is a 7-bit, logarithmic, nonvolatile (NV) digi-

tal resistor that features an on-chip temperature sensor

and associated analog-to-digital converter (ADC). The

integrated temperature sensor indexes a 72-byte NV

lookup table (LUT) encompassing a temperature range

from -40°C to +100°C. The LUT output can drive the

resistor directly or be added to an NV initial-value regis-

ter (IVR) to drive the resistor. This flexible LUT-based

architecture allows the DS1841 to provide a tempera-

ture-compensated resistor output with arbitrary slope.

Programming is accomplished by an I

C-compatible

interface, which can operate at speeds of up to 400kHz.

Applications

Optical Transceivers

Linear and Nonlinear Compensation

Instrumentation and Industrial Controls

Mechanical Potentiometer Replacement

Features

♦ 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor

with a 3.6kΩ Fixed Resistor

♦ 128 Wiper Tap Points

♦ On-Chip Temperature Sensor and ADC

♦ 72-Byte Lookup Table (LUT)

♦ I

C-Compatible Serial Interface

♦ Address Pins Allow Up to Four DS1841s to Share

the Same I

C Bus

♦ Digital Supply of 2.7V to 5.5V

♦ -40°C to +100°C Operating Range

♦ 3mm x 3mm, 10-Pin TDFN Package

134

10 8 7

SCL RH RW

SDA

*EP

*EXPOSED PAD

N.C.

GND

RGND

TDFN

3.0mm × 3.0mm × 0.8mm

TOP VIEW

DS1841

Pin Configuration

Ordering Information

0.1μF

3.3V

APD BIAS CONTROL APPLICATION

OUT

SDA

SCL

GND

100pF

RGND

APD

4.7kΩ

DC-DC

CONVERTER

DS1841

Typical Operating Circuit

Denotes a lead-free package.

T&R = Tape and reel.

Registers and Modes are capitalized for clarity.

PART TEMP RANGE PIN-PACKAGE

DS1841T+ -40°C to +100°C 10 TDFN

DS1841T+T&R -40°C to +100°C 10 TDFN

1 2 3 4 5 6 ... 15 16

Inhaltsverzeichnis

Seite 1 - Logarithmic Resistor

DS1841Temperature-Controlled, NV, I2C, Logarithmic ResistorRev 0; 11/07________________________________________________________________Maxim Integrate

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor10 ______________________________________________________________________________________Me

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor______________________________________________________________________________________ 11Re

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor12 ______________________________________________________________________________________Re

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor______________________________________________________________________________________ 13I2

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor14 ______________________________________________________________________________________By

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor______________________________________________________________________________________ 15Wr

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DS1841Temperature-Controlled, NV, I2C, Logarithmic ResistorMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely e

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor2 _______________________________________________________________________________________RE

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor_______________________________________________________________________________________ 3TE

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor4 _______________________________________________________________________________________No

Seite 12

DS1841Temperature-Controlled, NV, I2C, Logarithmic ResistorSUPPLY CURRENTvs. SUPPLY VOLTAGEDS1841 toc01SUPPLY VOLTAGE (V)SUPPLY CURRENT (mA)5.04.54.03

Seite 13

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor6 _______________________________________________________________________________________Pi

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor_______________________________________________________________________________________ 7LU

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor8 _______________________________________________________________________________________Te

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DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor_______________________________________________________________________________________ 9Su

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