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AD5200 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD5200
Beschreibung 256-Position and 33-Position Digital Potentiometers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 15 Seiten
AD5200 Datasheet, Funktion
a
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 kor 50 k
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






AD5200 Datasheet, Funktion
AD5200/AD5201Typical Performance Characteristics
0.20
0.15
VDD = 2.7V, VSS = 0V
0.10
0.05
0.00
؊0.05
؊0.10
؊0.15
؊0.20
0
VDD = +2.7V, VSS = –2.7V
VDD = 5.5V, VSS = 0V
32 64 96 128 160 192 224
CODE – Decimal
TPC 1. AD5200 10 k RDNL vs. Code
256
0.12
0.10
0.08
0.06
0.04
VDD = +2.7V
VSS = 2.7V
VDD = 5.5V, VSS = 0V
0.02
0.00
VDD = 2.7V, VSS = 0V
0.02
0 4 8 12 16 20 24 28
CODE Decimal
TPC 4. AD5201 10 k RINL vs. Code
32
0.03
0.02
VDD = 5.5V, VSS = 0V
VDD = 2.7V, VSS = 0V
0.01
0.00
0.01
0.02
VDD = +2.7V, VSS = 2.7V
0.03
0 4 8 12 16 20 24 28
CODE Decimal
TPC 2. AD5201 10 k RDNL vs. Code
32
0.10
0.05
VDD = 2.7V, VSS = 0V
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0
VDD = 5.5V, VSS = 0V
VDD = +2.7V, VSS = 2.7V
32 64 96 128 160 192 224 256
CODE Decimal
TPC 5. AD5200 10 k DNL vs. Code
0.7
0.6
VDD = 2.7V, VSS = 0V
0.5
0.4
0.3
VDD = 5.5V, VSS = 0V
0.2
0.1
0.0
0.1
0
VDD = +2.7V, VSS = 2.7V
32 64 96 128 160 192 224
CODE Decimal
TPC 3. AD5200 10 k RINL vs. Code
256
0.020
0.015
0.010
0.005
VDD = +2.7V, VSS = 2.7V
VDD = 5.5V, VSS = 0V
0.000
0.005
0.010
0
VDD = 2.7V, VSS = 0V
4 8 12 16 20 24 28
CODE Decimal
TPC 6. AD5201 10 k DNL vs. Code
32
–6– REV. D

6 Page









AD5200 pdf, datenblatt
AD5200/AD5201
A
SHDN
D7
D6
D5
D4
D3 R
D2
D1
D0
R
RDAC
LATCH &
DECODER
R
SWSHDN
SW2N؊1
SW2N؊2
SW1
SW0
W
R
RAB
2N1
B DIGITAL CIRCUITRY
OMITTED FOR CLARITY
Figure 2a. AD5200 Equivalent RDAC Circuit. 255 positions
can be achieved up to Switch SW 2N–1.
SHDN
A
SWSHDN
SW2N
D5 R SW2N؊1
D4
D3
D2
D1
R SW2N؊2
D0
R SW1
W
RDAC
LATCH &
DECODER
R
SW0
R
RAB
2N
B DIGITAL CIRCUITRY
OMITTED FOR CLARITY
Figure 2b. AD5201 Equivalent RDAC Circuit. Unlike AD5200,
33 positions can be achieved all the way to Switch SW 2N.
The general equation determining the digitally programmed
output resistance between W and B is:
( )RWB
D
=
D
255
RAB
+ 50
for AD5200
(1)
( )RWB
D
=
D
32 RAB
+ 50
for AD5201
(2)
where:
D is the decimal equivalent of the data contained in
RDAC latch.
RAB is the nominal end-to-end resistance.
RW is the wiper resistance contributed by the on-resistance
of the internal switch.
Note D in AD5200 is between 0 to 255 for 256 positions. On
the other hand, D in AD5201 is between 0 to 32 so that 33
positions can be achieved due to the slight internal structure
difference, Figure 2b.
Again if RAB = 10 kand A terminal can be opened or tied to
W, the following output resistance between W to B will be set
for the following RDAC latch codes:
D
(DEC)
255
128
1
0
AD5200 Wiper-to-B Resistance
RWB
()
10050
5070
89
50
Output State
Full-Scale (RAB + RW)
Midscale
1 LSB
Zero-Scale (Wiper Contact Resistance)
AD5201 Wiper-to-B Resistance
D
(DEC)
32
16
1
0
RWB
()
10050
5050
363
50
Output State
Full-Scale (RAB + RW)
Midscale
1 LSB
Zero-Scale (Wiper Contact Resistance)
Note that in the zero-scale condition a finite wiper resistance of
50 is present. Care should be taken to limit the current flow
between W and B in this state to no more than ± 20 mA to avoid
degradation or possible destruction of the internal switch contact.
Like the mechanical potentiometer the RDAC replaces, it is
totally symmetrical. The resistance between the wiper W and
Terminal A also produces a digitally controlled resistance RWA.
When these terminals are used, the B terminal should be tied to
the wiper. Setting the resistance value for RWA starts at a maxi-
mum value of resistance and decreases as the data loaded in
the latch is increased in value. The general equation for this
operation is:
( )255 D
( )RWA D = 255 RAB + 50
for AD5200 (3)
( )32 D
( )RWA D = 32 RAB + 50
for AD5201 (4)
Similarly, D in AD5200 is between 0 to 255, whereas D in
AD5201 is between 0 to 32.
For RAB = 10 kand B terminal is opened or tied to the wiper
W, the following output resistance between W and A will be set
for the following RDAC latch codes:
–12–

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