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Analog Devices Semiconductor Electronic Components Datasheet

AD5260 Datasheet

8-Bit Dual Nonvolatile Memory Digital Potentiometer

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AD5260 pdf
a
1-/2-Channel
15 V Digital Potentiometers
AD5260/AD5262
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 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.
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.
*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, 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.
FUNCTIONAL BLOCK DIAGRAMS
A WB
SHDN
VDD
VSS
VL
CS
CLK
SDI
GND
RDAC
REGISTER
AD5260
LOGIC
POWER-ON
RESET
8
SERIAL INPUT REGISTER
PR
SDO
A1 W1 B1
A2 W2 B2
SHDN
VDD
VSS
VL
CS
CLK
SDI
GND
RDAC1 REGISTER
RDAC2 REGISTER
LOGIC
POWER-ON
RESET
8
SERIAL INPUT REGISTER
AD5262
PR
SDO
100
RWA
75
RWB
50
25
0
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 –40C to +85C.
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
© Analog Devices, Inc., 2002


Analog Devices Semiconductor Electronic Components Datasheet

AD5260 Datasheet

8-Bit Dual Nonvolatile Memory Digital Potentiometer

No Preview Available !

AD5260 pdf
AD5260/AD5262–SPECIFICATIONS (VDD = +15 V, VSS = 0 V or, VDD = +5 V, VSS = –5 V, VL = +5 V, VA = +5 V,
VB = 0 V, – 40؇C < TA < +85؇C unless otherwise noted.)
ELECTRICAL CHARACTERISTICS 20 kW, 50 kW, 200 kW VERSIONS
Parameter
Symbol
Conditions
Min Typ1 Max Unit
DC CHARACTERISTICS RHEOSTAT MODE Specifications apply to all VRs
Resistor Differential NL2
Resistor Nonlinearity2
R-DNL
R-INL
RWB, VA = NC
RWB, VA = NC
Nominal Resistor Tolerance3
RAB
TA = 25C
Resistance Temperature Coefficient
RAB/T Wiper = No Connect
Wiper Resistance
RW IW = 1 V/RAB
Channel Resistance Matching (AD5262 only) RWB/RWB Ch 1 and 2 RWB, DX = 80H
Resistance Drift
RAB
–1
–1
–30
DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE Specifications apply to all VRs
Resolution
N
8
Differential Nonlinearity4
DNL
–1
Integral Nonlinearity4
INL
–1
Voltage Divider Temperature Coefficient DVW/DT
Full-Scale Error
VWFSE
Zero-Scale Error
VWZSE
Code = 80H
Code = FFH
Code = 00H
–2
0
RESISTOR TERMINALS
Voltage Range5
Capacitance6 Ax, Bx
Capacitance6 Wx
Common-Mode Leakage Current
Shut Down Current7
VA, B, W
CA,B
CW
ICM
ISHDN
f = 5 MHz,
measured to GND, Code = 80H
f = 1 MHz,
measured to GND, Code = 80H
VA =VB = VDD /2
VSS
DIGITAL INPUTS and OUTPUTS
Input Logic High
Input Logic Low
Input Logic High
Input Logic Low
Output Logic High (SDO)
Output Logic Low (SDO)
Input Current8
Input Capacitance6
VIH
VIL
VIH
VIL
VOH
VOL
IIL
CIL
VL = 3 V, VSS = 0 V
VL = 3 V, VSS = 0 V
RPULL-UP = 2 kW to 5 V
IOL = 1.6 mA, VLOGIC = 5 V
VIN = 0 V or 5 V
2.4
2.1
4.9
POWER SUPPLIES
Logic Supply
Power Single-Supply Range
Power Dual-Supply Range
Logic Supply Current
Positive Supply Current
Negative Supply Current
Power Dissipation9
Power Supply Sensitivity
VL
VDD RANGE
VDD/SS RANGE
IL
IDD
ISS
PDISS
PSS
VSS = 0 V
VL = 5 V
VIH = 5 V or VIL = 0 V
VSS = –5 V
VIH = 5 V or VIL = 0 V,
VDD = +5 V, VSS = –5 V
DVDD = +5 V, ±10%
2.7
4.5
± 4.5
DYNAMIC CHARACTERISTICS6, 10
Bandwidth –3 dB
Total Harmonic Distortion
VW Settling Time
Crosstalk11
BW
THDW
tS
CT
Analog Crosstalk
CTA
Resistor Noise Voltage
eN_WB
RAB = 20 kW/50 kW/200 kW
VA = 1 VRMS, VB = 0 V,
f = 1 kHz, RAB = 20 kW
VA = +5 V, VB = –5 V,
±1 LSB error band, RAB = 20 kW
VA = VDD, VB = 0 V,
Measure VW with Adjacent
RDAC Making Full-Scale
Code Change (AD5262 only)
VA1 = VDD, VB1 = 0V,
Measure VW1 with
VW2 = 5 V p-p @ f = 10 kHz,
RAB = 20 kW/200 kW (AD5262 only)
RWB = 20 kW
f = 1 kHz
± 1/4 +1
± 1/2 +1
30
35
60 150
0.1
0.05
± 1/4 +1
± 1/2 +1
5
–1 +0
12
VDD
25
55
1
5
0.8
0.6
0.4
±1
5
0.003
5.5
16.5
± 5.5
60
1
1
0.3
0.01
310/130/30
0.014
5
1
–64
13
LSB
LSB
%
ppm/C
W
%
%
Bits
LSB
LSB
ppm/C
LSB
LSB
V
pF
pF
nA
mA
V
V
V
V
V
V
mA
pF
V
V
V
mA
mA
mA
mW
%/%
kHz
%
ms
nV–s
dB
nV/÷Hz
–2– REV. 0


Part Number AD5260
Description 8-Bit Dual Nonvolatile Memory Digital Potentiometer
Maker Analog Devices
Total Page 20 Pages
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