AD5232BRUZ50-REEL7 Analog Devices Inc, AD5232BRUZ50-REEL7 Datasheet - Page 19

no-image

AD5232BRUZ50-REEL7

Manufacturer Part Number
AD5232BRUZ50-REEL7
Description
Dual 8Bit EEMEM Dig Pot
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD5232BRUZ50-REEL7

Taps
256
Resistance (ohms)
50K
Number Of Circuits
2
Temperature Coefficient
600 ppm/°C Typical
Memory Type
Non-Volatile
Interface
4-Wire SPI Serial
Voltage - Supply
2.7 V ~ 5.5 V, ±2.25 V ~ 2.75 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP
Resistance In Ohms
50K
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
EVAL-AD5232-10EBZ - BOARD EVALUATION FOR AD5232-10
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD5232BRUZ50-REEL7
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Table 11. Nominal Individual Segment Resistor Values (Ω)
Device
Resolution
8-Bit
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
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
where:
D is the decimal equivalent of the data contained in the RDACx
register.
R
R
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
D (Dec)
255
128
1
0
1
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
programmability of the various terminal connections.
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.
AB
W
AB
is the wiper resistance.
is the nominal resistance between Terminal A and Terminal B.
= 10 kΩ
R
WB
(
D
R
10011
5050
89
50
)
WB
=
10 kΩ
Version
78.10
256
(D) (Ω)
D
×
AB
R
WA
AB
) of the AD5232 VR has 256 contact
. Figure 41 shows the symmetrical
for R
Output State
Full scale
Midscale
1 LSB
Zero scale
Segmented Resistor Size
+
R
W
AB
End-to-End Values
50 kΩ
Version
390.5
1
(wiper contact resistance)
100 kΩ
Version
781.0
Rev. A | Page 19 of 24
(1)
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
where:
D is the decimal equivalent of the data contained in the RDAC
register.
R
R
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
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
coefficient.
AB
W
AB
is the wiper resistance.
is the nominal resistance between Terminal A and Terminal B.
= 10 kΩ
R
WA
100
75
50
25
0
(
0
D
)
=
R
Figure 41. Symmetrical RDAC Operation
BA
256
WB
with temperature has a 600 ppm/°C temperature
256
R
89
5050
10011
10050
WA
64
D
(D) (Ω)
×
R
AB
CODE (Decimal)
BA
+
match. Device-to-device matching
128
R
W
Output State
Full scale
Midscale
1 LSB
Zero scale
WA
starts at a maximum
192
R
AD5232
WA
258
(2)

Related parts for AD5232BRUZ50-REEL7