AD5232BRU50-REEL7

Manufacturer Part NumberAD5232BRU50-REEL7
DescriptionIC DGTL POT DUAL 256POS 16-TSSOP
ManufacturerAnalog Devices Inc
AD5232BRU50-REEL7 datasheet
 

Specifications of AD5232BRU50-REEL7

Rohs StatusRoHS non-compliantTaps256
Resistance (ohms)50KNumber Of Circuits2
Temperature Coefficient600 ppm/°C TypicalMemory TypeNon-Volatile
Interface4-Wire SPI SerialVoltage - Supply2.7 V ~ 5.5 V, ±2.25 V ~ 2.75 V
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case16-TSSOPResistance In Ohms50K
Number Of Elements2# Of Taps256
Resistance (max)50KOhmPower Supply RequirementSingle/Dual
Interface TypeSerial (4-Wire/SPI)Single Supply Voltage (typ)3/5V
Dual Supply Voltage (typ)±2.5VSingle Supply Voltage (min)2.7V
Single Supply Voltage (max)5.5VDual Supply Voltage (min)±2.25V
Dual Supply Voltage (max)±2.75VOperating Temp Range-40C to 85C
Operating Temperature ClassificationIndustrialMountingSurface Mount
Pin Count16For Use WithEVAL-AD5232-10EBZ - BOARD EVALUATION FOR AD5232-10
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Table 11. Nominal Individual Segment Resistor Values (Ω)
Segmented Resistor Size
for R
End-to-End Values
AB
Device
10 kΩ
50 kΩ
Resolution
Version
Version
8-Bit
78.10
390.5
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The nominal resistances of the RDACx between Terminal A and
Terminal B are available with values of 10 kΩ, 50 kΩ, and 100 kΩ.
The final digits of the part number determine the nominal
resistance value; for example, 10 kΩ = 10; 100 kΩ = 100. The
nominal resistance (R
) of the AD5232 VR has 256 contact
AB
points accessed by Wiper Terminal W, plus the Terminal B contact.
The 8-bit data-word in the RDACx latch is decoded to select
one of the 256 possible settings.
The general transfer equation, which determines the digitally
programmed output resistance between Wx and Bx, is
D
=
×
+
R
(
D
)
R
R
WB
W
AB
256
where:
D is the decimal equivalent of the data contained in the RDACx
register.
R
is the nominal resistance between Terminal A and Terminal B.
AB
R
is the wiper resistance.
W
Table 12 lists the output resistance values that are set for the
RDACx latch codes shown for 8-bit, 10 kΩ potentiometers.
Table 12. Nominal Resistance Value at Selected Codes for
R
= 10 kΩ
AB
D (Dec)
R
(D) (Ω)
Output State
WB
255
10011
Full scale
128
5050
Midscale
1
89
1 LSB
1
0
50
Zero scale
(wiper contact resistance)
1
Note that in the zero-scale condition, a finite wiper resistance of 50 Ω is
present. Care should be taken to limit the current flow between Wx and Bx
in this state to a maximum continuous value of 2 mA to avoid degradation
or possible destruction of the internal switch metallization. Intermittent
current operation to 20 mA is allowed.
Like the mechanical potentiometer that the RDACx replaces,
the AD5232 parts are totally symmetrical. The resistance between
the Wiper Terminal W and Terminal A also produces a digitally
controlled resistance, R
. Figure 41 shows the symmetrical
WA
programmability of the various terminal connections.
100
75
100 kΩ
Version
781.0
50
25
R
0
0
Figure 41. Symmetrical RDAC Operation
When these terminals are used, Terminal B should be tied to
the wiper. Setting the resistance value for R
value of resistance and decreases as the data loaded in the latch
is increased in value. The general transfer equation for this
operation is
(1)
=
R
(
D
)
WA
where:
D is the decimal equivalent of the data contained in the RDAC
register.
R
is the nominal resistance between Terminal A and Terminal B.
AB
R
is the wiper resistance.
W
Table 13 lists the output resistance values that are set for the
RDACx latch codes shown for 8-bit, 10 kΩ potentiometers.
Table 13. Nominal Resistance Value at Selected Codes for
R
= 10 kΩ
AB
D (Dec)
255
128
1
0
The multichannel AD5232 has a ±0.2% typical distribution of
internal channel-to-channel R
is dependent on process lot and exhibits a −40% to +20% variation.
The change in R
BA
coefficient.
Rev. A | Page 19 of 24
AD5232
R
WB
WA
64
128
192
CODE (Decimal)
starts at a maximum
WA
256
D
×
+
R
R
AB
W
256
R
(D) (Ω)
Output State
WA
89
Full scale
5050
Midscale
10011
1 LSB
10050
Zero scale
match. Device-to-device matching
BA
with temperature has a 600 ppm/°C temperature
258
(2)