4-/6-Channel
Digital Potentiometers
AD5204/AD5206
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
256 positions
AD5204
V
DD
CS
Multiple independently programmable channels
AD5204—4-channel
AD5206—6-channel
A1
W1
B1
CLK
D7
D0
EN
RDAC
LATCH
#1
ADDR
DEC
A2
A1
A0
Potentiometer replacement
DO
SDO
R
Terminal resistance of 10 kΩ, 50 kΩ, 100 kΩ
3-wire SPI-compatible serial data input
+2.7 V to +5.5 V single-supply operation; 2.7 V dual-supply
operation
D7
SER
REG
A4
D7
D0
Power-on midscale preset
W4
RDAC
LATCH
#4
DI
D0
SDI
B4
APPLICATIONS
SHDN
8
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, time constants
Line impedance matching
V
R
SS
POWER-ON
PRESET
PR
GND
Figure 1.
AD5206
V
CS
DD
GENERAL DESCRIPTION
A1
W1
B1
CLK
D7
D0
The AD5204/AD5206 provides 4-/6-channel, 256-position
digitally controlled variable resistor (VR) devices. These devices
perform the same electronic adjustment function as a
EN
RDAC
LATCH
#1
ADDR
DEC
A2
A1
A0
R
potentiometer or variable resistor. Each channel of the
AD5204/AD5206 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 endpoint 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 10 kΩ, 50 kΩ, or 100 kΩ has
a nominal temperature coefficient of 700 ppm/°C.
D7
SER
REG
A6
W6
B6
D7
D0
RDAC
LATCH
#6
DI
D0
SDI
8
R
POWER-ON
PRESET
GND
V
SS
Figure 2.
PR
An optional reset ( ) pin forces all the AD5204 wipers to the
midscale position by loading 0x80 into the VR latch.
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 that is loaded from a standard
3-wire serial-input digital interface. Eleven data bits make up
the data-word clocked into the serial input register. The first
three bits are decoded to determine which VR latch will be
The AD5204/AD5206 is available in the 24-lead surface-mount
SOIC, TSSOP, and PDIP packages. The AD5204 is also available in
a 32-lead, 5 mm × 5 mm LFCSP package. All parts are guaranteed
to operate over the extended industrial temperature range of
−40°C to +85°C. For additional single-, dual-, and quad-channel
devices, see the AD8400/AD8402/AD8403 data sheets.
CS
loaded with the last eight bits of the data-word when the
strobe is returned to logic high. A serial data output pin at the
opposite end of the serial register (AD5204 only) allows simple
daisy chaining in multiple VR applications without requiring
additional external decoding logic.
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 ©1999–2007 Analog Devices, Inc. All rights reserved.
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