AD5201 Analog Devices, Inc., AD5201 Datasheet

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AD5201

Manufacturer Part Number
AD5201
Description
256-position And 33-position Digital Potentiometers
Manufacturer
Analog Devices, Inc.
Datasheet

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a
GENERAL DESCRIPTION
The AD5200 and AD5201 are programmable resistor devices,
with 256 positions and 33 positions respectively, that can be digi-
tally controlled through a 3-wire SPI serial interface. The terms
programmable resistor, variable resistor (VR), and RDAC are
commonly used interchangeably to refer to digital potentiometers.
These devices perform the same electronic adjustment function
as a potentiometer or variable resistor. Both AD5200/AD5201
contain a single variable resistor in the compact µSOIC-10
package. Each device contains a fixed wiper resistance at the
wiper contact that taps the programmable resistance at a point
determined by a digital code. The code is loaded in the serial
input register. The resistance between the wiper and either end
point of the programmable resistor varies linearly with respect to
the digital code transferred into the VR latch. Each variable
resistor 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 10 kΩ or 50 kΩ
has a nominal temperature coefficient of 500 ppm/°C. The VR
has a VR latch that holds its programmed resistance value. The
VR latch is updated from an SPI-compatible serial-to-parallel
shift register that is loaded from a standard 3-wire serial-input
digital interface. Eight data bits for the AD5200 and six data
bits for the AD5201 make up the data word that is clocked into
the serial input register. The internal preset forces the wiper to
the midscale position by loading 80
AD5201 VR latches respectively. The SHDN pin forces the
resistor to an end-to-end open-circuit condition on the A terminal
and shorts the wiper to the B terminal, achieving a microwatt
power shutdown state. When SHDN is returned to logic high,
the previous latch setting puts the wiper in the same resistance
setting prior to shutdown. The digital interface is still active dur-
ing shutdown so that code changes can be made that will produce
a new wiper position when the device is returned from shutdown.
All parts are guaranteed to operate over the extended industrial
temperature range of –40°C to +85°C.
256-Position and 33-Position
GND
CLK
V
SDI
CS
DD
FUNCTIONAL BLOCK DIAGRAM
Digital Potentiometers
AD5200/AD5201
PWR-ON
PRESET
REG
SER
Dx
AD5200/AD5201
8/6
RDAC
H
REG
and 10
H
into AD5200 and
V
A
W
B
SHDN
SS

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AD5201 Summary of contents

Page 1

... Eight data bits for the AD5200 and six data bits for the AD5201 make up the data word that is clocked into the serial input register. The internal preset forces the wiper to the midscale position by loading 80 ...

Page 2

... AD5200/AD5201–SPECIFICATIONS AD5200 ELECTRICAL CHARACTERISTICS Parameter DC CHARACTERISTICS RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor Integral Nonlinearity 3 Nominal Resistor Tolerance Resistance Temperature Coefficient Wiper Resistance DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE (Specifications apply to all VRs.) Resolution 4 Differential Nonlinearity 4 Integral Nonlinearity Voltage Divider Temperature Coefficient Full-Scale Error ...

Page 3

... AD5201 ELECTRICAL CHARACTERISTICS Parameter DC CHARACTERISTICS RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor Integral Nonlinearity 3 Nominal Resistor Tolerance Resistance Temperature Coefficient Wiper Resistance DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE (Specifications apply to all VRs.) 4 Resolution 5 Differential Nonlinearity 5 Integral Nonlinearity Voltage Divider Temperature Coefficient Full-Scale Error Zero-Scale Error ...

Page 4

... AD5200/AD5201–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter INTERFACE TIMING CHARACTERISTICS (Applies to All Parts [Notes 2, 3]) Input Clock Pulsewidth Data Setup Time Data Hold Time CS Setup Time CS High Pulsewidth CLK Fall to CS Fall Hold Time CLK Fall to CS Rise Hold Time CS Rise to Clock Rise Setup ...

Page 5

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD5200/AD5201 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 6

... AD5200/AD5201–Typical Performance Characteristics 0.20 0.15 0.10 0.05 0.00 0.05 0. +2.7V –2. 0. 5.5V 0. 128 160 CODE – Decimal Ω 0. 5.5V 0.02 DD 0.01 0.00 –0. +2.7V –2. –0.02 –0. CODE – Decimal Ω 0.7 0.6 0.5 0.4 0 5.5V 0.2 0.1 0 +2.7V –2. –0 ...

Page 7

... – –40 160 140 120 2.5V 100 4.0 5.0 AD5200/AD5201 5. 2.7V DD – TEMPERATURE – 5.5V – TEMPERATURE – C SEE TEST CIRCUIT 2.7V ...

Page 8

... AD5200/AD5201 500 450 400 350 300 250 200 150 100 3V/ 10k 100k FREQUENCY – Hz Ω 500 450 400 350 300 250 200 150 5V/ 100 ...

Page 9

... SEE TEST CIRCUIT 10 6 CODE = 10k –6 50k –12 –18 –24 –30 –36 –42 – 100 10k 50k V W (20mV/DIV) CS (5V/DIV) 1M AD5200/AD5201 10k 50k 1M 1k 10k 100k FREQUENCY – Hz 10k 50k 1k 10k 100k 1M FREQUENCY – Hz ...

Page 10

... AD5200/AD5201 OUTPUT (2V/DIV) INPUT (5V/DIV) 4000 3500 3000 2500 2000 1500 1000 500 0 500 128 160 CODE – Decimal ∆ ∆ 3500 3000 2500 2000 1500 1000 500 0 500 0 3000 2500 2000 V 1500 OUT (20mV/DIV) 1000 500 0 – 500 ...

Page 11

... The 6-bit data word in the RDAC latch is decoded to select one of the 33 possible settings. Data will automatically be equal to Position 33. The wiper 00 10 kΩ part, the first tap point of AD5201 yields 363 Ω for data 01 H each LSB data value increase moves the wiper up the resistor ladder until the last tap point is reached ...

Page 12

... W of the internal switch. Note D in AD5200 is between 0 to 255 for 256 positions. On the other hand AD5201 is between that 33 positions can be achieved due to the slight internal structure difference, Figure 2b. Again the following output resistance between will be set ...

Page 13

... AD5200 255 ( ) for AD5201 where D in AD5200 is between 0 to 255 and D in AD5201 is between 0 to 32. For more accurate calculation, including the effects of wiper resistance, V can be found as ...

Page 14

... AD5200/AD5201 TEST CIRCUITS Figures define the test conditions used in the product specification table. DUT LSB = V+/ CONNECT DUT DUT MS2 MS1 PSRR (dB LOG ...

Page 15

... AD5200/AD5201 Packages Comments µSOIC-10 Full AC Specs, Dual Supply, Pwr-On-Reset, Low Cost PDIP, SO-8, µSOIC-8 No Rollover, Pwr-On-Reset Single Dual ± PDIP-14, SOL-16, TSSOP-14 Supply Operation µ ...

Page 16

... AD5200/AD5201 0.038 (0.97) 0.030 (0.76) Revision History Location Data Sheet changed from REV REV. B. Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 02/01—Data Sheet changed from REV REV. A. Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 TPCs 31 and 32 added . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 10-Lead SOIC (RM-10) 0 ...

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