1-/2-Channel 15 V Digital Potentiometer
AD5260/AD5262
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
A
W
B
256 positions
AD5260: 1 channel
AD5262: 2 channels (independently programmable)
Potentiometer replacement
SHDN
AD5260
V
DD
RDAC
REGISTER
20 kΩ, 50 kΩ, 200 kΩ
V
SS
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 midscale preset
V
L
POWER-ON
RESET
PR
CS
LOGIC
8
CLK
SDI
SDO
SERIAL INPUT REGISTER
APPLICATIONS
GND
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Stereo channel audio level control
Figure 1. AD5260
A1 W1 B1
A2 W2 B2
Programmable voltage-to-current conversion
Programmable filters, delays, time constants
Line impedance matching
SHDN
V
DD
Low resolution DAC replacement
RDAC1
RDAC2
REGISTER
REGISTER
V
SS
GENERAL DESCRIPTION
V
L
The AD5260/AD5262 provide a single- or dual-channel, 256-
position, digitally controlled variable resistor (VR) device.1
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 Ω, 50 Ω, or 200 Ω 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.
POWER-ON
RESET
PR
CS
LOGIC
8
CLK
SDI
SDO
SERIAL INPUT REGISTER
AD5262
GND
Figure 2. AD5262
edge of the CLK pin. The AD5262 address bit determines the
corresponding VR latch to be loaded with the last eight bits of
CS
the data word during the positive edging of
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 (
forces the wiper to the midscale position by loading 0x80 into
the VR latch.
PR
)
The AD5260/AD5262 are available in thin surface-mount
14-lead TSSOP and 16-lead TSSOP packages. All parts are
guaranteed to operate over the extended industrial temperature
range of −40°C to +85°C.
Each VR has its own VR latch that 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 whereas the AD5262 contains a 9-bit serial
register. Each bit is clocked into the register on the positive
1 The terms digital potentiometers, VR, and RDAC are used interchangeably.
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2002–2010 Analog Devices, Inc. All rights reserved.
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