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PDF AD5254 Data sheet ( Hoja de datos )
| Número de pieza | AD5254 | |
| Descripción | Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers | |
| Fabricantes | Analog Devices | |
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Data Sheet
Quad 64-/256-Position I2C Nonvolatile
Memory Digital Potentiometers
AD5253/AD5254
FEATURES
AD5253: quad 64-position resolution
AD5254: quad 256-position resolution
1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Nonvolatile memory1 stores wiper settings w/write protection
Power-on refreshed to EEMEM settings in 300 µs typ
EEMEM rewrite time = 540 µs typ
Resistance tolerance stored in nonvolatile memory
12 extra bytes in EEMEM for user-defined information
I2C-compatible serial interface
Direct read/write access of RDAC2 and EEMEM registers
Predefined linear increment/decrement commands
Predefined ±6 dB step change commands
Synchronous or asynchronous quad-channel update
Wiper setting readback
4 MHz bandwidth—1 kΩ version
Single supply 2.7 V to 5.5 V
Dual supply ±2.25 V to ±2.75 V
2 slave address-decoding bits allow operation of 4 devices
100-year typical data retention, TA = 55°C
Operating temperature: –40°C to +105°C
APPLICATIONS
Mechanical potentiometer replacement
Low resolution DAC replacement
RGB LED backlight control
White LED brightness adjustment
RF base station power amp bias control
Programmable gain and offset control
Programmable attenuators
Programmable voltage-to-current conversion
Programmable power supply
Programmable filters
Sensor calibrations
GENERAL DESCRIPTION
The AD5253/AD5254 are quad-channel, I2C®, nonvolatile
mem-ory, digitally controlled potentiometers with 64/256
positions, respectively. These devices perform the same
electronic adjust-ment functions as mechanical potentiometers,
trimmers, and variable resistors.
The parts’ versatile programmability allows multiple modes of
operation, including read/write access in the RDAC and EEMEM
registers, increment/decrement of resistance, resistance changes
in ±6 dB scales, wiper setting readback, and extra EEMEM for
storing user-defined information, such as memory data for other
components, look-up table, or system identification information.
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
VDD
VSS
DGND
WP
SCL
SDA
AD0
AD1
RDAC EEMEM
EEMEM
POWER-ON
REFRESH
RAB TOL
I2C
SERIAL
INTERFACE
DATA
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
AD5253/AD5254
RDAC0
REGIS-
TER
RDAC1
REGIS-
TER
RDAC2
REGIS-
TER
RDAC3
REGIS-
TER
RDAC0
A0
W0
B0
RDAC1
A1
W1
B1
RDAC2
A2
W2
B2
RDAC3
A3
W3
B3
Figure 1.
The AD5253/AD5254 allow the host I2C controllers to write
any of the 64-/256-step wiper settings in the RDAC registers
and store them in the EEMEM. Once the settings are stored,
they are restored automatically to the RDAC registers at system
power-on; the settings can also be restored dynamically.
The AD5253/AD5254 provide additional increment,
decrement, +6 dB step change, and –6 dB step change in
synchronous or asynchronous channel update mode. The
increment and decrement functions allow stepwise linear
adjustments, with a ± 6 dB step change equivalent to doubling
or halving the RDAC wiper setting. These functions are useful
for steep-slope, nonlinear adjustments, such as white LED
brightness and audio volume control.
The AD5253/AD5254 have a patented resistance-tolerance
storing function that allows the user to access the EEMEM and
obtain the absolute end-to-end resistance values of the RDACs
for precision applications.
The AD5253/AD5254 are available in TSSOP-20 packages in
1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are
guaranteed to operate over the –40°C to +105°C extended
industrial temperature range.
1The terms nonvolatile memory and EEMEM are used interchangeably.
2The terms digital potentiometer and RDAC are used interchangeably.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2003–2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
AD5253/AD5254
10 kΩ, 50 kΩ, 100 kΩ VERSIONS
VDD = +3 V ± 10% or +5 V ± 10%, VSS = 0 V or VDD/VSS = ±2.5 V ± 10%, VA = VDD, VB = 0 V, –40°C < TA < +105°C, unless otherwise noted.
Table 2.
Parameter
Symbol
Conditions
Min Typ1
Max Unit
DC CHARACTERISTICS—
RHEOSTAT MODE
Resolution
N AD5253/AD5254
6/8 Bits
Resistor Differential Nonlinearity2
Resistor Nonlinearity2
Nominal Resistor Tolerance
Resistance Temperature
Coefficient
R-DNL
R-INL
ΔRAB/RAB
(ΔRAB/RAB) × 106/ΔT
RWB, RWA = NC, AD5253
RWB, RWA = NC, AD5254
RWB, RWA = NC, AD5253
RWB, RWA = NC, AD5254
TA = 25°C
−0.75
−1.00
−0.75
−2.5
−20
±0.10
±0.25
±0.25
±1.0
650
+0.75
+1.00
+0.75
+2.5
+20
LSB
LSB
LSB
LSB
%
ppm/°C
Wiper Resistance
RW
Channel-Resistance Matching ΔRAB1/ΔRAB2
DC CHARACTERISTICS—
POTENTIOMETER DIVIDER MODE
IW = 1 V/R, VDD = 5 V
IW = 1 V/R, VDD = 3 V
RAB = 10 kΩ, 50 kΩ
RAB = 100 kΩ
75 130 Ω
200 300 Ω
0.15 %
0.05 %
Differential Nonlinearity3
DNL
AD5253
−0.5 ±0.1
+0.5 LSB
AD5254
−1.0 ±0.3
+1.0 LSB
Integral Nonlinearity3
INL
AD5253
−0.50 ±0.15
+0.50 LSB
AD5254
−1.5 ±0.5
+1.5 LSB
Voltage Divider
Temperature Coefficient
(ΔVW/VW) × 106/ΔT Code = half scale
15 ppm/°C
Full-Scale Error
VWFSE
Code = full scale, AD5253
Code = full scale, AD5254
−1.0 −0.3 0 LSB
−3 −1
0 LSB
Zero-Scale Error
VWZSE
Code = zero scale, AD5253
Code = zero scale, AD5254
0 0.3
0 1.2
1.0 LSB
3.0 LSB
RESISTOR TERMINALS
Voltage Range4
Capacitance5 A, B
VA, VB, VW
CA, CB
f = 1 kHz, measured to GND,
code = half scale
VSS
85
VDD V
pF
Capacitance5 W CW f = 1 kHz, measured to GND,
code = half scale
95 pF
Common-Mode Leakage Current ICM
DIGITAL INPUTS AND OUTPUTS
VA = VB = VDD/2
0.01 1 µA
Input Logic High
Input Logic Low
Output Logic High (SDA)
Output Logic Low (SDA)
WP Leakage Current
A0 Leakage Current
Input Leakage Current
(Other than WP and A0)
VIH
VIL
VOH
VOL
IWP
IA0
II
VDD = 5 V, VSS = 0 V
VDD/VSS = +2.7 V/0 V or VDD/VSS = ±2.5 V
VDD = 5 V, VSS = 0 V
VDD/VSS = +2.7 V/0 V or VDD/VSS = ±2.5 V
RPULL-UP = 2.2 kΩ to VDD = 5 V, VSS = 0 V
RPULL-UP = 2.2 kΩ to VDD = 5 V, VSS = 0 V
WP = VDD
A0 = GND
VIN = 0 V or VDD
2.4
2.1
4.9
V
V
0.8 V
0.6 V
V
0.4 V
8 µA
3 µA
±1 µA
Input Capacitance5
CI
5 pF
Rev. C | Page 5 of 32
5 Page 
Data Sheet
240
220
200
180
160
140
120
100
80
60
40
20
0
0
VDD = 2.7V
TA = 25C
DATA = 0x00
VDD = 5.5V
TA = 25C
12345
VBIAS (V)
Figure 9. Wiper Resistance vs. VBIAS
6
6
4
2
0
–2
–4
–6
–40
–20 0
20 40 60 80 100
TEMPERATURE (C)
Figure 10. Change of RWB vs. Temperature
120
1000
950 VDD = 5V
900
TA = –40°C TO +85°C
VA = VDD
850 VB = 0V
800
10kΩ
750
700
650 50kΩ
100kΩ
600
550
500
0
32 64 96 128 160 192 224 256
CODE (Decimal)
Figure 11. Rheostat Mode Tempco (∆RWB/RWB)/∆T × 106 vs. Code
AD5253/AD5254
50
45
VDD = 5V
TA = –40°C TO +85°C
40 VA = VDD
VB = 0V
35
30
25
20
15
100kΩ
10kΩ
10
5 50kΩ
0
0 32 64 96 128 160 192 224 256
CODE (Decimal)
Figure 12. Potentiometer Mode Tempco (∆VWB/VWB)/∆T × 106 vs. Code
0
0xFF
–6
0x40
0x80
–12
0x20
–18 0x10
–24
–30
–36 0x08 0x04
0x02
–42 0x01 0x00
–48
–54
–60
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Figure 13. Gain vs. Frequency vs. Code, RAB = 1 kΩ, TA = 25°C
0
0xFF
–6 0x80
–12
0x40
–18
0x20
–24 0x10
–30 0x08
–36 0x04
–42 0x01
–48 0x00
–54 0x02
–60
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Figure 14. Gain vs. Frequency vs. Code, RAB = 10 kΩ, TA = 25°C
Rev. C | Page 11 of 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD5254.PDF ] | |
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