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AD5165 - Analog Devices - 256-Position/ Ultralow Power 1.8 V Logic-Level Digital Potentiometer

Номер произв AD5165
Описание 256-Position/ Ultralow Power 1.8 V Logic-Level Digital Potentiometer
Производители Analog Devices
логотип Analog Devices логотип 
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AD5165 Даташит, Описание, Даташиты
256-Position, Ultralow Power
1.8 V Logic-Level Digital Potentiometer
AD5165
FEATURES
Ultralow standby power IDD = 50 nA typical
256-position
End-to-end resistance 100 kΩ
Logic high voltage 1.8 V
Power supply 2.7 V to 5.5 V
Low temperature coefficient 35 ppm/°C
Compact thin 8-lead TSOT-8 (2.9 mm × 2.8 mm) package
Simple 3-wire digital interface
Wide operating temperature −40°C to +125°C
Pin-to-pin compatible to AD5160 with CS inverted
APPLICATIONS
Battery-operated electronics adjustment
Remote utilities meter adjustment
Mechanical potentiometer replacement
Transducer circuit adjustment
Automotive electronics adjustment
Gain control and offset adjustment
System calibration
VCXO adjustment
GENERAL OVERVIEW
The AD5165 provides a compact 2.9 mm × 2.8 mm packaged
solution for 256-position adjustment applications. These devices
perform the same electronic adjustment function as mechanical
potentiometers or variable resistors, with enhanced resolution,
solid-state reliability, and superior low temperature coefficient
performance. The AD5165’s supply voltage requirement is 2.7 V
to 5.5 V, but its logic voltage requirement is 1.8 V to VDD. The
AD5165 consumes very low quiescent power during standby
mode and is ideal for battery-operated applications.
Wiper settings are controlled through a simple 3-wire interface.
The interface is similar to the SPI® digital interface except for the
inverted chip-select function that minimizes logic power con-
sumption in the idling state. The resistance between the wiper
and either endpoint of the fixed resistor varies linearly with
respect to the digital code transferred into the wiper register.
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 50 nA typical standby power allows use in battery-
operated portable or remote utility device applications.
FUNCTIONAL BLOCK DIAGRAM
VDD
CS
SDI
CLK
3-WIRE
INTERFACE
A
W
WIPER
REGISTER
B
GND
Figure 1.
PIN CONFIGURATION
W1
8A
VDD 2 AD5165 7 B
GND 3
TOP VIEW
(Not to Scale)
6
CS
CLK 4
5 SDI
Figure 2.
TYPICAL APPLICATION
VOH = 1.8V MIN
3.3V
DIGITAL
CONTROL
LOGIC OR
MICRO
5V
VDD
AD5165
CS
CLK
VA
WIDE TERMINAL
VW VOLTAGE RANGE:
VB 0V < VA,VB,VW < 5V
SDI GND
Figure 3.
Note:
The terms digital potentiometer, RDAC, and VR 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, 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
registered trademarks are the 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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
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AD5165 Даташит, Описание, Даташиты
AD5165
TABLE OF CONTENTS
Electrical Characteristics—100 kVersion .................................. 3
Absolute Maximum Ratings............................................................ 5
Pin Configuration and Functional Descriptions.......................... 6
Typical Performance Characteristics ............................................. 7
Test Circuits..................................................................................... 11
3-Wire Digital Interface................................................................. 12
Theory of Operation ...................................................................... 13
Programming the Variable Resistor ......................................... 13
Programming the Potentiometer Divider ............................... 14
3-Wire Serial Bus Digital Interface .......................................... 14
ESD Protection ........................................................................... 14
Terminal Voltage Operating Range.......................................... 14
Power-Up Sequence ................................................................... 14
Layout and Power Supply Bypassing ....................................... 15
Evaluation Board ........................................................................ 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 16
REVISION HISTORY
4/04—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
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AD5165 Даташит, Описание, Даташиты
AD5165
ELECTRICAL CHARACTERISTICS—100 kVERSION
VDD = 5 V ± 10%, or 3 V ± 10%; VA = VDD; VB = 0 V; –40°C < TA < +125°C; unless otherwise noted.
Table 1.
Parameter
Symbol
DC CHARACTERISTICS—RHEOSTAT MODE
Resistor Differential Nonlinearity2
R-DNL
Resistor Integral Nonlinearity2
R-INL
Nominal Resistor Tolerance3
∆RAB/RAB
Resistance Temperature Coefficient
(∆RAB/RAB)/∆Tx106
Wiper Resistance
RW
DC CHARACTERISTICS—POTENTIOMETER DIVIDER MODE
Resolution
N
Differential Nonlinearity4
DNL
Integral Nonlinearity4
INL
Voltage Divider Temperature
Coefficient
(∆VW/VW )/∆Tx106
Full-Scale Error
VWFSE
Zero-Scale Error
VWZSE
RESISTOR TERMINALS
Voltage Range5
VA,B,W
Capacitance6 A, B
CA,B
Capacitance6 W
CW
Common-Mode Leakage
DIGITAL INPUTS AND OUTPUTS
Input Logic High
Input Logic Low
Input Capacitance6
POWER SUPPLIES
Power Supply Range
Supply Current
ICM
VIH
VIL
CIL
VDD RANGE
IDD
Power Dissipation7
Power Supply Sensitivity
DYNAMIC CHARACTERISTICS6, 8
Bandwidth −3 dB
Total Harmonic Distortion
VW Settling Time
Resistor Noise Voltage Density
PDISS
PSS
BW
THDW
tS
eN_WB
Conditions
RWB, VA = no connect
RWB, VA = no connect
TA = 25°C
VAB = VDD, wiper = no connect
VDD = 2.7 V/5.5 V
Code = 0x80
Code = 0xFF
Code = 0x00
f = 1 MHz, measured to GND,
Code = 0x80
f = 1 MHz, measured to GND,
Code = 0x80
VA = VB = VDD/2
VDD = 2.7 V to 5.5 V
VDD = 2.7 V to 5.5 V
Digital inputs = 0 V or VDD
VDD = 2.7 V, digital inputs = 1.8 V
VDD = 5 V, digital inputs = 1.8 V
Digital inputs = 0 V or VDD
VDD = +5 V ± 10%,
Code = Midscale
Code = 0x80
VA =1 V rms, VB = 0 V, f = 1 kHz,
VA = 5 V, VB = 0 V,
±1 LSB error band
RWB = 50 kΩ
Min
−1
−2
−20
−1
−1
−0.5
0
GND
1.8
2.7
Typ1 Max
Unit
±0.1
±0.25
35
85/50
+1
+2
+20
150/120
LSB
LSB
%
ppm/°C
8
±0.1 +1
±0.3 +1
15
−0.3 0
0.1 0.5
Bits
LSB
LSB
ppm/°C
LSB
LSB
VDD
90
95
1
V
pF
pF
nA
V
0.6 V
5 pF
0.05
10
500
±0.001
5.5
1
5.5
±0.005
V
µA
µA
µA
µW
%/%
55 kHz
0.05 %
2 µs
28 nV/√Hz
1 Typical specifications represent average readings at +25°C and VDD = 5 V.
2 Resistor position nonlinearity error R-INL is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper
positions. R-DNL measures the relative step change from ideal between successive tap positions. Parts are guaranteed monotonic.
3 VAB = VDD, wiper (VW) = no connect.
4 INL and DNL are measured at VW with the RDAC configured as a potentiometer divider similar to a voltage output D/A converter. VA = VDD and VB = 0 V.
5 Resistor terminals A, B, and W have no limitations on polarity with respect to each other.
6 Guaranteed by design and not subject to production test.
7 PDISS is calculated from (IDD × VDD). CMOS logic level inputs result in minimum power dissipation.
8 All dynamic characteristics use VDD = 5 V.
Rev. 0 | Page 3 of 16
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