AD5291 Datasheet, PDF (1/28 Pages) Analog Devices – 256-/1024-Position, DigiPOT+ Potentiometers with Maximum ±1% R-Tolerance Error and 20-TP Memory

256-/1024-Position, DigiPOT+ Potentiometers with
Maximum ±1% R-Tolerance Error and 20-TP Memory
AD5291/AD5292
FEATURES
Single-channel, 256-/1024-position resolution
20 kΩ nominal resistance
Calibrated ±1% nominal resistor tolerance (resistor
performance mode)
20-time programmable (20-TP) set-and-forget resistance
setting allows multiple time permanent programming
Rheostat mode temperature coefficient: 35 ppm/°C
Voltage divider temperature coefficient: 5 ppm/°C
+9 V to +33 V single-supply operation
±9 V to ±16.5 V dual-supply operation
SPI-compatible serial interface
Wiper setting readback
Power-on refreshed from 20-TP memory
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain and offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, and time constants
Programmable power supply
Low resolution DAC replacement
Sensor calibration
V_LOGIC
SCLK
SYNC
DIN
SDO
RDY
FUNCTIONAL BLOCK DIAGRAM
V_DD
RESET
POWER-ON
RESET
AD5291/
AD5292
RDAC
REGISTER
A
SERIAL DATA
INTERFACE
W
OTP
MEMORY
BLOCK
B
V_SS
EXT_CAP
Figure 1.
GND
GENERAL DESCRIPTION
The AD5291/AD5292, members of the Analog Devices, Inc.,
DigiPOT+ family of potentiometers, are single-channel, 256-/
1024-position digital potentiometers¹ that combine industry
leading variable resistor performance with nonvolatile memory
(NVM) in a compact package. These devices are capable of
operating across a wide voltage range; supporting both dual
supply operation at ±10.5 V to ±16.5 V and single supply
operation at +21 V to +33 V, while ensuring less than 1% end-
to-end resistor tolerance (R-tolerance) error and offering
20-time programmable (20-TP) memory.
The guaranteed industry-leading low resistor tolerance error
feature simplifies open-loop applications as well as precision
calibration and tolerance matching applications.
1 _{The terms digital potentiometer and RDAC are used interchangeably.}
The AD5291/AD5292 device wiper settings are controllable
through the SPI digital interface. Unlimited adjustments are
allowed before programming the resistance value into the
|20-TP memory. The AD5291/AD5292 do not require any
external voltage supply to facilitate fuse blow and there are
20 opportunities for permanent programming. During 20-TP
activation, a permanent blow fuse command freezes the wiper
position (analogous to placing epoxy on a mechanical trimmer).
The AD5291/AD5292 are available in a compact 14-lead TSSOP
package. The part is guaranteed to operate over the extended
industrial temperature range of −40°C to +105°C.
Rev. 0
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