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PDF AD5201 Data sheet ( Hoja de datos )
| Número de pieza | AD5201 | |
| Descripción | 256-Position and 33-Position Digital Potentiometers | |
| Fabricantes | Analog Devices | |
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FEATURES
AD5200—256-Position
AD5201—33-Position
10 k⍀, 50 k⍀
3-Wire SPI-Compatible Serial Data Input
Single Supply 2.7 V to 5.5 V or
Dual Supply ؎2.7 V for AC or Bipolar Operations
Internal Power-On Midscale Preset
APPLICATIONS
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage-to-Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
256-Position and 33-Position
Digital Potentiometers
AD5200/AD5201
FUNCTIONAL BLOCK DIAGRAM
VDD
CS
CLK
SDI
GND
AD5200/AD5201
SER
REG
8/6 RDAC
Dx REG
PWR-ON
PRESET
VSS
A
W
B
SHDN
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 MSOP
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 80H and 10H into AD5200 and
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.
REV. D
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/461-3113
www.analog.com
© Analog Devices, Inc., 2012
1 page  
ABSOLUTE MAXIMUM RATINGS1
(TA = 25°C, unless otherwise noted)
VDD to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3, +7 V
VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, –7 V
VA, VB, VW to GND . . . . . . . . . . . . . . . . . . . . . . . . . VSS, VDD
IMAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA2
Digital Inputs and Output Voltage to GND . . . . . . . 0 V, 7 V
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Maximum Junction Temperature (TJ Max) . . . . . . . . . 150°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 300°C
Thermal Resistance θJA, MSOP . . . . . . . . . . . . . 200°C/W
Package Power Dissipation = (TJ Max – TA)/θJA
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating; functional operation of the device
at these or any other conditions above those listed in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
2Max current is bounded by the maximum current handling of the switches,
maximum power dissipation of the package, and maximum applied voltage across
any two of the A, B, and W terminals at a given resistance. Please refer to TPC 31
and TPC 32 for detail.
Pin
1
2
3
4
5
6
7
8
9
10
AD5200/AD5201
PIN FUNCTION DESCRIPTIONS
Name Description
B
VSS
GND
CS
SDI
CLK
SHDN
VDD
W
A
B Terminal.
Negative Power Supply, specified for opera-
tion from 0 V to –2.7 V.
Ground.
Chip Select Input, Active Low. When CS
returns high, data will be loaded into the
DAC register.
Serial Data Input.
Serial Clock Input, positive edge triggered.
Active Low Input. Terminal A open circuit.
Shutdown controls Variable Resistors of
RDAC to temporary infinite.
Positive Power Supply (Sum of VDD + VSS
≤ 5.5 V).
Wiper Terminal.
A Terminal.
PIN CONFIGURATION
B1
10 A
VSS 2
GND 3
AD5200/
AD5201
9W
8 VDD
CS
4
TOP VIEW
(Not to Scale)
7
SHDN
SDI 5
6 CLK
CAUTION
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.
WARNING!
ESD SENSITIVE DEVICE
REV. D
–5–
5 Page 
AD5200/AD5201
100.0 Table I. AD5200 Serial-Data Word Format
10.0
RAB = 10k⍀
1.0
RAB = 50k⍀
0.1
0
32 64 96 128 160 192 224 256
CODE – Decimal
TPC 31. AD5200 I MAX vs. Code
100.0
10.0
RAB = 10k⍀
1.0
RAB = 50k⍀
0.1
04
8 12 16 20 24 28 32
CODE – Decimal
TPC 32. AD5201 I MAX vs. Code
OPERATION
The AD5200/AD5201 provide 255 and 33 positions digitally-
controlled variable resistor (VR) devices. Changing the
programmed VR settings is accomplished by clocking in an 8-bit
serial data word for AD5200, and a 6-bit serial data word for
AD5201, into the SDI (Serial Data Input) pins. Table I provides
the serial register data word format. The AD5200/AD5201 are
preset to a midscale internally during power-on condition. In
addition, the AD5200/AD5201 contain power shutdown
SHDN pins that place the RDAC in a zero power consump-
tion state where the immediate switches next to Terminals A and
B are open-circuited. Meanwhile, the wiper W is connected to B
terminal, resulting in only leakage current consumption in the VR
structure. During shutdown, the VR latch contents are maintained
when the RDAC is inactive. When the part is returned from
shutdown, the stored VR setting will be applied to the RDAC.
B7 B6 B5 B4 B3 B2 B1 B0
D7 D6 D5 D4 D3 D2 D1 D0
MSB
LSB
27 20
Table II. AD5201 Serial-Data Word Format
B5* B4 B3 B2 B1 B0
D5* D4 D3 D2 D1 D0
MSB
LSB
25 20
*Six data bits are needed for 33 positions.
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The nominal resistance of the RDAC between Terminals A and
B are available with values of 10 kΩ and 50 kΩ. The final two
digits of the part number determine the nominal resistance
value, e.g., 10 kΩ = 10 and 50 kΩ = 50. The nominal resistance
(RAB) of AD5200 has 256 contact points accessed by the wiper
terminal. The 8-bit data word in the RDAC latch of AD5200 is
decoded to select one of the 256 possible settings. In both parts,
the wiper’s first connection starts at the B terminal for data 00H.
This B-terminal connection has a wiper contact resistance of
50 Ω as long as valid VDD/VSS is applied, regardless of the nominal
resistance. For a 10 kΩ part, the second connection of AD5200 is
the first tap point with 89 Ω [RWB = RAB/255 + RW = 39 Ω + 50 Ω]
for data 01H. The third connection is the next tap point representing
78 + 50 = 128 Ω for data 02H. Due to its unique internal structure,
AD5201 has 5-bit + 1 resolution, but needs a 6-bit data word to
achieve the full 33 steps resolution. The 6-bit data word in the
RDAC latch is decoded to select one of the 33 possible settings.
Data 34 to 63 will automatically be equal to Position 33. The
wiper 00H connection of AD5201 gives 50 Ω. Similarly, for a
10 kΩ part, the first tap point of AD5201 yields 363 Ω for
data 01H, 675 Ω for data 02H. For both AD5200 and AD5201,
each LSB data value increase moves the wiper up the resistor
ladder until the last tap point is reached. Figures 2a and 2b show
the simplified diagrams of the equivalent RDAC circuits.
–11–
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AD5201.PDF ] | |
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