AD5270 Datasheet PDF - Analog Devices
| Part Number | AD5270 | |
| Description | (AD5270 / AD5271) SPI Interface and 50-TP Memory Digital Rheostat | |
| Manufacturers | Analog Devices | |
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Data Sheet
1024-/256-Position, 1% Resistor Tolerance Error,
SPI Interface and 50-TP Memory Digital Rheostat
AD5270/AD5271
FEATURES
Single-channel, 1024-/256-position resolution
20 kΩ, 50 kΩ, 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
APPLICATIONS
Mechanical rheostat 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
GENERAL DESCRIPTION
The AD5270/AD52711 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.
FUNCTIONAL BLOCK DIAGRAM
VDD
POWER-ON
RESET
AD5270/AD5271
SCLK
SYNC
DIN
SDO
SERIAL
INTERFACE
10/8
RDAC
REGISTER
50-TP
MEMORY
BLOCK
A
W
VSS EXT_CAP
Figure 1.
GND
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 × 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.
1 Protected by U.S.Patent Number 7688240
Rev. F
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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Data Sheet
AD5270/AD5271
ELECTRICAL CHARACTERISTICS—AD5271
VDD = 2.7 V to 5.5 V, VSS = 0 V; VDD = 2.5 V to 2.75 V, VSS = −2.5 V to −2.75 V; −40°C < TA < +125°C, unless otherwise noted.
Table 4.
Parameter
DC CHARACTERISTICS—RHEOSTAT MODE
Resolution
Resistor Integral Nonlinearity2, 3
Resistor Differential Nonlinearity2
Nominal Resistor Tolerance
R-Perf Mode4
Normal Mode
Resistance Temperature Coefficient5, 6
Wiper Resistance
RESISTOR TERMINALS
Terminal Voltage Range5, 7
Capacitance5 A
Capacitance5 W
Common-Mode Leakage Current5
DIGITAL INPUTS
Input Logic5
High
Low5
Input Current
Input Capacitance5
DIGITAL OUTPUT
Output Voltage5
High
Low
Tristate Leakage Current
Output Capacitance5
POWER SUPPLIES
Single-Supply Power Range
Dual-Supply Power Range
Supply Current
Positive
Negative
50-TP Store Current5, 8
Positive
Negative
OTP Read Current5, 9
Positive
Negative
Power Dissipation10
Power Supply Rejection Ratio5
Symbol
R-INL
R-DNL
VINH
VINL
IIN
CIN
VOH
VOL
IDD
ISS
IDD_OTP_STORE
ISS_OTP_STORE
IDD_OTP_READ
ISS_OTP_READ
PSRR
Test Conditions/Comments
See Table 5 and Table 6
Code = full scale
Code = zero scale
f = 1 MHz, measured to GND, code =
half scale
f = 1 MHz, measured to GND, code =
half scale
VA = VW
RPULL_UP = 2.2 kΩ to VDD
RPULL_UP = 2.2 kΩ to VDD
VDD = 2.7 V to 5.5 V, VSS = 0 V
VDD = 2.5 V to 2.75 V, VSS = −2.5 V to −2.75 V
VSS = 0 V
VIH = VDD or VIL = GND
ΔVDD/ΔVSS = ±5 V ± 10%
RAW = 20 kΩ
RAW = 50 kΩ
RAW = 100 kΩ
Min Typ1
8
−1
−1
−1 ±0.5
±15
5
35
VSS
90
40
2.0
±1
5
VDD − 0.1
−1
5
2.7
±2.5
−1
4
−4
−500
−66
−75
−78
Max
+1
+1
+1
70
VDD
50
0.8
0.4
0.6
+1
5.5
±2.75
1
500
5.5
−55
−67
−70
Unit
Bits
LSB
LSB
%
%
ppm/°C
Ω
V
pF
pF
nA
V
V
µA
pF
V
V
V
µA
pF
V
V
µA
µA
mA
mA
µA
µA
µW
dB
Rev. F | Page 5 of 24
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| Information | Total 24 Pages | |
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