AD5203 Analog Devices, AD5203 Datasheet

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AD5203

Manufacturer Part Number
AD5203
Description
8-Bit Dual Nonvolatile Memory Digital Potentiometer
Manufacturer
Analog Devices
Datasheet

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a
GENERAL DESCRIPTION
The AD5203 provides a quad channel, 64-position digitally-
controlled variable resistor (VR) device. These parts perform the
same electronic adjustment function as a potentiometer or vari-
able resistor. The AD5203 contains four independent variable
resistors in a 24-lead SOIC and the compact TSSOP-24 pack-
ages. Each part contains a fixed resistor with a wiper contact
that taps the fixed resistor value at a point determined by a digi-
tal code loaded into the controlling serial input register. The
resistance between the wiper and either endpoint of the fixed
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 k , or 100 k has a 1% channel-to-
channel matching tolerance with a nominal temperature coeffi-
cient of 700 ppm/ C.
Each VR has its own VR latch which holds its programmed
resistance value. These VR latches are updated from an internal
serial-to-parallel shift register that is loaded from a standard
3-wire serial-input digital interface. Eight data bits make up the
data word clocked into the serial input register. The data word is
decoded where the first two bits determine the address of the VR
latch to be loaded, the last 6-bits are data. A serial data output
pin at the opposite end of the serial register allows simple daisy-
chaining in multiple VR applications without additional external
decoding logic.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
64 Position
Replaces Four Potentiometers
10 k , 100 k
Power Shutdown—Less than 5
3-Wire SPI-Compatible Serial Data Input
10 MHz Update Data Loading Rate
+2.7 V to +5.5 V Single Supply Operation
Midscale Preset
APPLICATIONS
Mechanical Potentiometer Replacement
Programmable Filters, Delays, Time Constants
Volume Control, Panning
Line Impedance Matching
Power Supply Adjustment
A
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
DGND
The reset RS pin forces the wiper to the midscale position by
loading 20
tor to an end-to-end open circuit condition on terminal A and
shorts the wiper to terminal B, achieving a microwatt power
shutdown state. When shutdown is returned to logic-high the
previous latch settings put the wiper in the same resistance set-
ting prior to shutdown.
The AD5203 is available in a narrow body P-DIP-24, the
24-lead surface mount package, and the compact 1.1 mm thin
TSSOP-24 package. All parts are guaranteed to operate over the
extended industrial temperature range of –40 C to +85 C.
For pin compatible higher resolution applications, see the 256-
position AD8403 product.
CLK
V
SDI
CS
DD
H
into the VR latch. The SHDN pin forces the resis-
FUNCTIONAL BLOCK DIAGRAM
AD5203
4-Channel, 64-Position
D
CK Q RS
SELECT
World Wide Web Site: http://www.analog.com
Digital Potentiometer
SERIAL
A1, A0
LATCH
DAC
8-BIT
SDO
2
1
2
3
4
6
RS
© Analog Devices, Inc., 1998
LATCH
CK RS
LATCH
CK RS
LATCH
CK RS
LATCH
CK RS
6-BIT
6-BIT
6-BIT
6-BIT
AD5203
6
6
6
6
DAC 1
SHDN
DAC 2
SHDN
DAC 3
SHDN
DAC 4
SHDN
SHDN
A1
W1
B1
AGND1
A2
B2
AGND2
A3
A4
B4
AGND4
W2
W3
B3
AGND3
W4

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AD5203 Summary of contents

Page 1

... When shutdown is returned to logic-high the previous latch settings put the wiper in the same resistance set- ting prior to shutdown. The AD5203 is available in a narrow body P-DIP-24, the 24-lead surface mount package, and the compact 1.1 mm thin TSSOP-24 package. All parts are guaranteed to operate over the extended industrial temperature range of – ...

Page 2

... AD5203–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter DC CHARACTERISTICS RHEOSTAT MODE Specifications Apply to All VRs 2 Resistor Differential NL 2 Resistor Nonlinearity Error 3 Nominal Resistor Tolerance Resistance Temperature Coefficient Wiper Resistance Nominal Resistance Match DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE Specifications Apply to All VRs Resolution 4 Differential Nonlinearity Error ...

Page 3

... 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 AD5203 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 4

... SHDN SDI 12 13 Model k Temperature Range AD5203AN10 10 – +85 C AD5203AR10 10 – +85 C AD5203ARU10 10 – +85 C AD5203AN100 100 – +85 C AD5203AR100 100 – +85 C AD5203ARU100 100 – +85 C Pin No. Name AGND2 AGND1 3 ...

Page 5

... + CURRENT – Figure 3. Resistance Linearity vs. Conduction Current 12 AD5203-10K VERSION 10 R (END-TO-END (WIPER-TO-END CODE = –75 –50 – TEMPERATURE – C Figure 6. Nominal Resistance vs. ...

Page 6

... Performance Characteristics AD5203 R W (20mV/DIV) CS (5V/DIV) TIME 500ns/DIV Figure 11. One Position Step Change at Half-Scale (Code OUTPUT CS TIME 5 s/DIV Figure 14. Large Signal Settling Time 0 CODE = – – – – 5dB/DIV – ...

Page 7

... FREQUENCY – Hz Figure 21. –3 dB Frequency at Half-Scale 100 –55 –35 – 105 125 TEMPERATURE – C Figure 24. Shutdown Current vs. Temperature –7– AD5203 1200 A – +5. + CODE = 15 1000 H B – +3.3V DD CODE = 15 H 800 C – +5.5V DD CODE = – ...

Page 8

... Test Circuits AD5203 DUT 1LSB = V+/ Figure 26. Potentiometer Divider Nonlinearity Error Test Circuit (INL, DNL) NO CONNECT DUT Figure 27. Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL DUT = I 1V/R W NOMINAL WHERE V B AND V ...

Page 9

... AD5203. The exact timing requirements are shown in Figure 1. The AD5203 resets to a midscale by asserting the RS pin, sim- plifying initial conditions at power-up. Both parts have a power shutdown SHDN pin that places the RDAC in a zero power consumption state where terminals Ax are open-circuited and the wiper Wx is connected to Bx, resulting in only leakage cur- rents being consumed in the VR structure ...

Page 10

... This would require 16 bits of address and data comply- ing to the word format provided in Table I if two AD5203 four- channel RDACs are daisy chained. During shutdown, SHDN the SDO output pin is forced to the off (logic high state) to disable power dissipation in the pull-up resistor ...

Page 11

... D Q REGISTER CK RS CLK RS Figure 37. Detail, SDO Output Schematic of the AD5203 REV. 0 All digital inputs are protected with a series input resistor and parallel Zener ESD structure shown in Figure 38. Applies to digital input pins CS, SDI, SDO, RS, SHDN, CLK. RDAC 1 Figure 38. Equivalent ESD Protection Circuit ...

Page 12

... AD5203 0.210 (5.33) MAX 0.200 (5.05) 0.125 (3.18) 0.0118 (0.30) 0.0040 (0.10) 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead Narrow Body Plastic DIP (N-24) 1.275 (32.30) 1.125 (28.60 0.280 (7.11) 0.240 (6.10) 0.325 (8.25 0.300 (7.62) PIN 1 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN 0.100 (2.54) 0.022 (0.558) 0.070 (1.77) SEATING BSC PLANE 0 ...

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