DS1841 Maxim Integrated Products, DS1841 Datasheet
DS1841
Manufacturer Part Number
DS1841
Description
Temperature-Controlled
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1841.pdf
(16 pages)
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
interface, which can operate at speeds of up to 400kHz.
Rev 0; 11/07
www.DataSheet4U.com
Registers and Modes are capitalized for clarity.
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.
4.7kΩ
APD BIAS CONTROL APPLICATION
Optical Transceivers
Linear and Nonlinear Compensation
Instrumentation and Industrial Controls
Mechanical Potentiometer Replacement
4.7kΩ
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
SDA
SCL
A1
A0
DS1841
General Description
RGND
GND
V
RW
RH
CC
Applications
3.3V
0.1μF
100pF
Temperature-Controlled, NV, I
2
CONVERTER
C-compatible
DC-DC
V
OUT
FB
V
APD
♦ 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor
♦ 128 Wiper Tap Points
♦ On-Chip Temperature Sensor and ADC
♦ 72-Byte Lookup Table (LUT)
♦ I
♦ Address Pins Allow Up to Four DS1841s to Share
♦ Digital Supply of 2.7V to 5.5V
♦ -40°C to +100°C Operating Range
♦ 3mm x 3mm, 10-Pin TDFN Package
+ Denotes a lead-free package.
T&R = Tape and reel.
DS1841T+
DS1841T+T&R
with a 3.6kΩ Fixed Resistor
the Same I
2
C-Compatible Serial Interface
Logarithmic Resistor
PART
TOP VIEW
*EXPOSED PAD
2
C Bus
3.0mm
SDA
SCL
10
1
-40°C to +100°C
-40°C to +100°C
TEMP RANGE
Ordering Information
N.C.
GND
9
2
×
3.0mm
DS1841
TDFN
V
RH
8
3
CC
Pin Configuration
RW
A1
×
7
4
0.8mm
*EP
RGND
A0
6
5
PIN-PACKAGE
10 TDFN
10 TDFN
Features
2
C,
1
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