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Rainbow-electronics DS1841 User Manual

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DS1841
Temperature-Controlled, NV, I
2
C,
Logarithmic Resistor
Rev 0; 11/07
________________________________________________________________
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.
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
2
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
2
C-Compatible Serial Interface
♦ Address Pins Allow Up to Four DS1841s to Share
the Same I
2
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
V
CC
A1
2
9
N.C.
GND
5
6
RGND
A0
TDFN
3.0mm × 3.0mm × 0.8mm
TOP VIEW
DS1841
Pin Configuration
Ordering Information
0.1μF
3.3V
APD BIAS CONTROL APPLICATION
V
CC
V
OUT
FB
SDA
SCL
A1
A0
GND
100pF
RW
RGND
RH
V
APD
4.7kΩ
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
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1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - Logarithmic Resistor

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

Page 2

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor10 ______________________________________________________________________________________Me

Page 3

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

Page 4

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor12 ______________________________________________________________________________________Re

Page 5

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

Page 6

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor14 ______________________________________________________________________________________By

Page 7

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

Page 8

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

Page 9

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor2 _______________________________________________________________________________________RE

Page 10

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

Page 11

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor4 _______________________________________________________________________________________No

Page 12

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

Page 13

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor6 _______________________________________________________________________________________Pi

Page 14

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

Page 15

DS1841Temperature-Controlled, NV, I2C, Logarithmic Resistor8 _______________________________________________________________________________________Te

Page 16

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

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