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Número de pieza | AD5174 | |
Descripción | Digital Rheostat With SPI Interface And 50-TP Memory | |
Fabricantes | Analog Devices | |
Logotipo | ||
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Single-Channel, 1024-Position, Digital Rheostat
with SPI Interface and 50-TP Memory
AD5174
FEATURES
Single-channel, 1024-position resolution
10 kΩ nominal resistance
50-times programmable (50-TP) wiper memory
Rheostat mode temperature coefficient: 35 ppm/°C
2.7 V to 5.5 V single-supply operation
±2.5 V to ±2.75 V dual-supply operation for ac or bipolar
operations
SPI-compatible interface
Wiper setting and memory readback
Power on refreshed from memory
Resistor tolerance stored in memory
Thin LFCSP 10-lead, 3 mm × 3 mm× 0.8 mm package
Compact MSOP, 10-lead, 3 mm × 4.9 mm × 1.1 mm package
APPLICATIONS
Mechanical rheostat replacements
Op-amp: variable gain control
Instrumentation: gain, offset adjustment
Programmable voltage-to-current conversions
Programmable filters, delays, time constants
Programmable power supply
Sensor calibration
GENERAL DESCRIPTION
The AD5174 is a single-channel, 1024-position digital rheostat
that combines industry leading variable resistor performance
with nonvolatile memory (NVM) in a compact package.
This device supports both dual-supply operation at ±2.5 V to
±2.75 V and single-supply operation at 2.7 V to 5.5 V and offers
50-times programmable (50-TP) memory.
FUNCTIONAL BLOCK DIAGRAM
VDD
POWER-ON
RESET
AD5174
SCLK
SYNC
DIN
SDO
SPI
SERIAL
INTERFACE
RDAC
REGISTER
10
50-TP
MEMORY
BLOCK
A
W
VSS EXT_CAP
Figure 1.
GND
The AD5174 device wiper settings are controllable through the
SPI digital interface. Unlimited adjustments are allowed before
programming the resistance value into the 50-TP memory. The
AD5174 does not require any external voltage supply to facili-
tate fuse blow and there are 50 opportunities for permanent
programming. During 50-TP activation, a permanent blow fuse
command freezes the resistance position (analogous to placing
epoxy on a mechanical rheostat).
The AD5174 is available in a 3 mm × 3mm 10-lead LFCSP
package and in a 10-lead MSOP package. The part is guaranteed
to operate over the extended industrial temperature range of
−40°C to +125°C.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2010 Analog Devices, Inc. All rights reserved.
1 page AD5174www.DataSheet4U.com
Shift Register and Timing Diagrams
DB9 (MSB)
DB0 (LSB)
0 0 C3 C2 C1 C0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
CONTROL BITS
DATA BITS
Figure 2. Shift Register Content
SCLK
SYNC
t4
t8
t2
t3
t1
DIN 0 0 C3 C2
D7 D6 D5
t7
t9
t5
t6
D2 D1 D0
SDO
Figure 3. Write Timing Diagram, CPOL=0, CPHA = 1
SCLK
SYNC
DIN
SDO
0 0 C3
D0 D0 0
0 C3
t10
X X C3
Figure 4. Read Timing Diagram, CPOL=0, CPHA = 1
t9
D1 D0
D1 D0
Rev. 0 | Page 5 of 20
5 Page AD5174www.DataSheet4U.com
TEST CIRCUITS
Figure 21 to Figure 25 define the test conditions used in the Specifications section.
DUT
W
A
IW
VMS
DUT
W
A
1GΩ
VMS
V
Figure 21. Resistor Position Nonlinearity Error
(Rheostat Operation; R-INL, R-DNL)
Figure 24. Gain vs. Frequency
DUT
CODE = 0x00
W
RWA
=
VMS
IW
IW
RW
=
RWA
2
A
VMS
Figure 22. Wiper Resistance
DUT
W
A
ICM
GND
+2.75V
–2.75V
GND
NC
+2.75V
GND
–2.75V
NC = NO CONNECT
Figure 25. Common Leakage Current
V+
VDD
W
A
V+ = VDD ±10%
PSRR (dB) = 20 log
VMS
VDD
IW
PSS
(%/%)
=
ΔVMS%
ΔVDD%
VMS
Figure 23. Power Supply Sensitivity (PSS, PSRR)
Rev. 0 | Page 11 of 20
11 Page |
Páginas | Total 20 Páginas | |
PDF Descargar | [ Datasheet AD5174.PDF ] |
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