1-/2-Channel
15 V Digital Potentiometers
a
AD5260/AD5262
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
256 Positions
A
W
B
AD5260 – 1-Channel
AD5262 – 2-Channel (Independently Programmable)
Potentiometer Replacement
SHDN
AD5260
20 k⍀, 50 k⍀, 200 k⍀
V
DD
RDAC
Low Temperature Coefficient 35 ppm/؇C
4-Wire SPI-Compatible Serial Data Input
5 V to 15 V Single-Supply; ؎5.5 V Dual-Supply Operation
Power ON Mid-Scale Preset
REGISTER
V
SS
V
L
POWER-ON
RESET
PR
CS
LOGIC
8
APPLICATIONS
CLK
SDI
GND
Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Stereo Channel Audio Level Control
Programmable Voltage to Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
SDO
SERIAL INPUT REGISTER
A1 W1 B1
A2 W2 B2
Low Resolution DAC Replacement
SHDN
GENERAL DESCRIPTION
V
DD
The AD5260/AD5262 provide a single- or dual-channel, 256-
position, digitally controlled variable resistor (VR) device.* These
devices perform the same electronic adjustment function as a
potentiometer or variable resistor. Each channel of the AD5260/
AD5262 contains a fixed resistor with a wiper contact that taps the
fixed resistor value at a point determined by a digital code loaded
into the SPI-compatible serial-input register. The resistance between
the wiper and either end point of the fixed resistor varies linearly
with respect to the digital code transferred into the VR latch. The
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 20 kW, 50 kW, or 200 kW has
a nominal temperature coefficient of 35 ppm/∞C. Unlike the majority
of the digital potentiometers in the market, these devices can operate
up to 15 V or ±5 V provided proper supply voltages are furnished.
RDAC1 REGISTER
RDAC2 REGISTER
V
SS
V
L
POWER-ON
RESET
PR
CS
LOGIC
8
CLK
SDI
SDO
SERIAL INPUT REGISTER
GND
AD5262
100
R
R
WB
WA
75
50
25
0
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, which is loaded from a standard 3-wire serial-input
digital interface. The AD5260 contains an 8-bit serial register
while the AD5262 contains a 9-bit serial register. Each bit is clocked
into the register on the positive edge of the CLK. The AD5262
address bit determines the corresponding VR latch to be loaded
with the last 8 bits of the data word during the positive edging of
CS strobe. A serial data output pin at the opposite end of the serial
register enables simple daisy chaining in multiple VR applications
without additional external decoding logic. An optional reset pin
(PR) forces the wiper to the mid-scale position by loading 80H into
the VR latch.
0
64
128
192
256
CODE – Decimal
Figure 1. RWA and RWB vs. Code
The AD5260/AD5262 are available in thin surface-mount TSSOP-14
and TSSOP-16 packages. All parts are guaranteed to operate over
the extended industrial temperature range of –40∞C to +85∞C.
*The terms digital potentiometers, VR, and RDAC are used interchangeably.
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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
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: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
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