AD5270 1024-Position, 1% Resistor Tolerance Error, SPI Interface and 50-TP Memory Digital Rheostat

Mechanical potentiometer replacements Op-amp: variable gain control Instrumentation: gain, offset adjustment Programmable voltage-to-current conversions Programmable filters, delays, time constants Programmable power supply Sensor calibration

The AD5270/AD5271 are single-channel, 1024-/ 256-position digital rheostats that combine industry leading variable resistor performance with nonvolatile memory (NVM) in a compact package.

The AD5270/AD5271 ensure less than 1% end-to-end resistor tolerance error and offer 50-times programmable (50-TP) memory.

The guaranteed industry leading low resistor tolerance error feature simplifies open-loop applications as well as precision calibration and tolerance matching applications.

The AD5270/AD5271 device wiper settings are controllable through the SPI digital interface. Unlimited adjustments are allowed before programming the resistance value into the 50-TP memory. The AD5270/AD5271 do not require any external voltage supply to facilitate fuse blow and there are 50 opportunities for permanent programming. During 50-TP activation, a permanent blow fuse command freezes the resistance position (analogous to placing epoxy on a mechanical trimmer).

The AD5270/AD5271 are available in a 3 mm x 3 mm, 10-lead LFCSP package and in a 10-lead MSOP package. The parts are guaranteed to operate over the extended industrial temperature range of −40°C to +125°C.

Applications

Features and Benefits

Single-channel, 1024-/256-position resolution
20 kΩ, 50 kΩ and 100 kΩ nominal resistance
Maximum ±1% nominal resistor tolerance error
50-times programmable (50-TP) wiper memory
Rheostat mode temperature coefficient: 5 ppm/°C
2.7 V to 5.5 V single-supply operation

±2.5 V to ±2.75 V dual-supply operation for ac or bipolar operations
SPI-compatible interface
Wiper setting readback
Power on refreshed from 50-TP memory
Thin LFCSP, 10-lead, 3 mm × 3 mm × 0.8 mm package
Compact MSOP, 10-lead, 3 mm × 4.9 mm × 1.1 mm package

Data Sheets

Document	note
AD5270/AD5271: 1024-/256-Position, 1% Resistor Tolerance Error, SPI Interface and 50-TP Memory Digital Rheostat Data Sheet (Rev. F)	PDF 245 kB

Application Notes

Document	note
AN-1291: Digital Potentiometers: Frequently Asked Questions (Rev. A)	PDF 805 kB
AN-1220: Compact, Low Cost, 5 V, Variable Gain, Inverting Amplifier Using the AD5270/AD5272 Digital Rheostat and AD8615 Op Amp (Rev. A)	PDF 127 kB
AN-1218: Compact, Low Cost, 5 V, Variable Gain, Noninverting Amplifier Using the AD5270/AD5272 Digital Rheostat and AD8615 Op Amp (Rev. A)	PDF 171 kB

User Guides

Document	note
UG-094: Evaluation Board for 10-Bit, Serial Input, High Precision Digital Rheostats	PDF 432 kB

Frequently Asked Questions

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD5270BCPZ-100-RL7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0	1.59	Y
AD5270BCPZ-20-RL7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0	1.59	Y
AD5270BRMZ-100 Production	10 ld MSOP	OTH 50	-40 to 125C	1.94	1.59	Y
AD5270BRMZ-100-RL7 Production	10 ld MSOP	REEL 1000	-40 to 125C	0	1.59	Y
AD5270BRMZ-20 Production	10 ld MSOP	OTH 50	-40 to 125C	1.94	1.59	Y
AD5270BRMZ-20-RL7 Production	10 ld MSOP	REEL 1000	-40 to 125C	0	1.59	Y
AD5270BRMZ-50 Production	10 ld MSOP	OTH 50	-40 to 125C	1.94	1.59	Y
AD5270BRMZ-50-RL7 Production	10 ld MSOP	REEL 1000	-40 to 125C	0	1.59	Y