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参数资料
型号： AD5260BRU20
厂商： ANALOG DEVICES INC
元件分类： 数字电位计
英文描述： 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
中文描述： 20K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO14
封装： TSSOP-14
文件页数： 1/20页
文件大小： 859K
代理商： AD5260BRU20
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD5260/AD5262
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Analog Devices, Inc., 2002
1-/2-Channel
15 V Digital Potentiometers
FEATURES
256 Positions
AD5260 – 1-Channel
AD5262 – 2-Channel (Independently Programmable)
Potentiometer Replacement
20 k
, 50 k
, 200 k
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
APPLICATIONS
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
Low Resolution DAC Replacement
GENERAL DESCRIPTION
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 20k
W
, 50 k
W
, or 200 k
W
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.
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 80
H
into
the VR latch.
*
The terms digital potentiometers, VR, and RDAC are used interchangeably.
FUNCTIONAL BLOCK DIAGRAMS
RDAC
REGISTER
LOGIC
8
POWER-ON
RESET
SERIAL INPUT REGISTER
AD5260
SHDN
V
DD
CS
CLK
SDI
GND
A
W
B
SDO
PR
V
SS
V
L
RDAC1 REGISTER
LOGIC
8
AD5262
SHDN
V
DD
V
SS
CLK
SDI
GND
RDAC2 REGISTER
A1
W1 B1
V
L
CS
SDO
PR
A2
W2 B2
POWER-ON
RESET
SERIAL INPUT REGISTER
R
WB
R
WA
CODE – Decimal
100
0
64
128
192
256
P
E
A
75
50
25
0
Figure 1. R
WA
and R
WB
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.
相关PDF资料
PDF描述
AD5260BRU20-REEL7 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
AD5260BRU200 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
AD5260BRU200-REEL7 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
AD5260BRU50-REEL7 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
AD5262BRU50-REEL7 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
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