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ADN2860 Datasheet PDF : 20 Pages
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3-Channel Digital Potentiometer with
Nonvolatile Memory
ADN2860
FEATURES
3 channels:
Dual 512-position
Single 128-position
25 kΩ or 250 kΩ full-scale resistance
Low temperature coefficient:
Potentiometer divider 15 ppm/°C
Rheostat mode 35 ppm/°C
Nonvolatile memory retains wiper settings
Permanent memory write protection
Linear increment/decrement
±6 dB increment/decrement
I2C-compatible serial interface
2.7 V to 5.5 V single-supply operation
±2.25 V to ±2.75 V dual-supply operation
Power-on reset time
256 bytes general-purpose user EEPROM
11 bytes RDAC user EEPROM
GBIC and SFP compliant EEPROM
100-year typical data retention at TA = 55°C
APPLICATIONS
Laser diode drivers
Optical amplifiers
TIA gain setting
TEC controller temperature setpoint
GENERAL DESCRIPTION
The ADN2860 provides dual 512-position and single
128-position, digitally controlled variable resistors1 (VR) in a
single 4 mm × 4 mm LFCSP package. This device performs the
same electronic adjustment function as a potentiometer,
trimmer, or variable resistor. Each VR offers a completely
programmable value of resistance between the A terminal and
the wiper, or the B terminal and the wiper. The fixed A-to-B
terminal resistance of 25 kΩ or 250 kΩ has a 1% channel-to-
channel matching tolerance and a nominal temperature
coefficient of 35 ppm/°C.
Wiper position programming, EEPROM2 reading, and EEPROM
writing are conducted via the standard 2-wire I2C interface. Pre-
vious default wiper position settings can be stored in memory,
and refreshed upon system power-up.
FUNCTIONAL BLOCK DIAGRAM
VDD
VSS
DGND
SCL
SDA
AD0
AD1
A0_EE
A1_EE
RESET
WP
I2C
SERIAL
INTERFACE
POWER-ON
RESET
256 BYTES
USER
EEPROM
32 BYTES
RDAC
EEPROM
DATA
CONTROL
COMMAND
DECODE
LOGIC
ADDRESS
DECODE
LOGIC
DECODE
LOGIC
RDAC0
A0
W0
B0
9 BITS
RDAC1
A1
W1
B1
9 BITS
RDAC2
A2
W2
B2
7 BITS
Figure 1.
Additional features of the ADN2860 include preprogrammed
linear and logarithmic increment/decrement wiper changing.
The actual resistor tolerances are stored in EEPROM so that the
actual end-to-end resistance is known, which is valuable for
calibration in precision applications.
The ADN2860 EEPROM, channel resolution, and package size
conform to GBIC and SFP specifications. The ADN2860 is
available in a 4 mm × 4 mm, 24-lead LFCSP package. All parts
are guaranteed to operate over the extended industrial tempera-
ture range −40°C to +85°C.
1 The terms programmable resistor, variable resistor, RDAC, and digital
potentiometer are used interchangeably.
2 The terms nonvolatile memory, EEMEM, and EEPROM are used
interchangeably.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
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