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AD5292 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD5292
Beschreibung (AD5291 / AD5292) Digital Potentiometer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
AD5292 Datasheet, Funktion
www.DataSheet4U.com
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
VLOGIC
SCLK
SYNC
DIN
SDO
RDY
FUNCTIONAL BLOCK DIAGRAM
VDD RESET
POWER-ON
RESET
AD5291/
AD5292
SERIAL DATA
INTERFACE
RDAC
REGISTER
OTP
MEMORY
BLOCK
A
W
B
VSS 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
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
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.






AD5292 Datasheet, Funktion
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Parameter
DYNAMIC CHARACTERISTICS4, 10
Bandwidth
Total Harmonic Distortion
VW Settling Time
Resistor Noise Density
Symbol
BW
THDW
tS
eN_WB
Conditions
−3 dB
VA = 1 V rms, VB = 0 V, f = 1 kHz
VA = 30 V, VB = 0 V, ±0.5 LSB error
band, initial code = zero scale
Code = full scale, normal mode
Code = full scale, R-Perf mode
Code = half scale, normal mode
Code = half scale, R-Perf mode
RWB = 10 kΩ, TA = 25°C, 0 kHz to
200 kHz
Min
Typ1 Max
520
−93
750
2.5
2.5
5
0.11
Unit
kHz
dB
ns
μs
μs
μs
nV/√Hz
1 Typical values represent average readings at 25°C, VDD = 15 V, VSS = −15 V, and VLOGIC = 5 V.
2 Resistor position nonlinearity error. R-INL is the deviation from an ideal value measured between the RWB at Code 0x02 and the RWB at Code 0xFF or between RWA at
Code 0xFD and RWA at Code 0x00. R-DNL measures the relative step change from ideal between successive tap positions. The specification is guaranteed in resistor
performance mode, with a wiper current of 1 mA for VA < 12 V and 1.2 mA for VA ≥ 12 V.
3 Resistor performance mode (see the Resistor Performance Mode section). The terms resistor performance mode and R-Perf mode are used interchangeably.
4 Guaranteed by design and characterization, not subject to production test.
5 INL and DNL are measured at VW with the RDAC configured as a potentiometer divider similar to a voltage output DAC. VA = VDD and VB = 0 V. DNL specification limits
of ±1 LSB maximum are guaranteed monotonic operating conditions.
6 Resistor Terminal A, Resistor Terminal B, and Resistor Terminal W have no limitations on polarity with respect to each other. Dual-supply operation enables ground-
referenced bipolar signal adjustment.
7 Different from operating current; supply current for fuse program lasts approximately 550 μs.
8 Different from operating current; supply current for fuse read lasts approximately 550 μs.
9 PDISS is calculated from (IDD × VDD) + (ISS × VSS) + (ILOGIC × VLOGIC).
10 All dynamic characteristics use VDD = +15 V, VSS = −15 V, and VLOGIC = 5 V.
RESISTOR PERFORMANCE MODE CODE RANGE—AD5292
Table 4.
Resistor
Tolerance per
Code
1% R-Tolerance
2% R-Tolerance
3% R-Tolerance
|VDD − VSS| = 30 V to 33 V
RWB
From 0x15E
to 0x3FF
From 0x8C
to 0x3FF
From 0x5A
to 0x3FF
RWA
From 0x00
to 0x2A1
From 0x00
to 0x373
From 0x00
to 0x3A5
|VDD − VSS| = 26 V to 30 V
RWB
From 0x1F4
to 0x3FF
From 0xB4
to 0x3FF
From 0x64
to 0x3FF
RWA
From 0x00
to 0x20B
From 0x00
to 0x34B
From 0x00
to 0x39B
|VDD − VSS| = 22 V to 26 V
RWB
From 0x1F4
to 0x3FF
From 0xFA
to 0x3FF
From 0x78
to 0x3FF
RWA
From 0x00
to 0x20B
From 0x00
to 0x305
From 0x00
to 0x387
|VDD − VSS| = 21 V to 22 V
RWB
RWA
N/A N/A
From 0xFA
to 0x3FF
From 0x78
to 0x3FF
From 0x00
to 0x305
From 0x00
to 0x387
Rev. 0 | Page 6 of 28

6 Page









AD5292 pdf, datenblatt
wwAwD.5D2at9aS1h/eAeDt45U2.c9o2m
0.25
–40°C
+25°C
+105°C
0.20
0.15
0.10
0.05
0
–0.05
–0.10
0
32 64 96 128 160 192 224 256
CODE (Decimal)
Figure 12. R-INL in Normal Mode vs. Code vs. Temperature (AD5291)
0.03
–40°C
+25°C
+105°C
0.02
0.01
0
–0.01
–0.02
–0.03
–0.04
–0.05
0
32 64 96 128 160 192 224 256
CODE (Decimal)
Figure 13. R-DNL in Normal Mode vs. Code vs. Temperature (AD5291)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
0
–40°C
+25°C
+105°C
128 256 384 512 640 768 896 1024
CODE (Decimal)
Figure 14. INL in R-Perf Mode vs. Code vs. Temperature (AD5292)
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
0
–40°C
+25°C
+105°C
128 256 384 512 640 768 896 1024
CODE (Decimal)
Figure 15. DNL in R-Perf Mode vs. Code vs. Temperature (AD5292)
0.25
0.20
–40°C
+25°C
+105°C
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
0
32 64 96 128 160 192 224 256
CODE (Decimal)
Figure 16. INL in R-Perf Mode vs. Code vs. Temperature (AD5291)
0.14
0.12
–40°C
+25°C
+105°C
0.10
0.08
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
0
32 64 96 128 160 192 224 256
CODE (Decimal)
Figure 17. DNL in R-Perf Mode vs. Code vs. Temperature (AD5291)
Rev. 0 | Page 12 of 28

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