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參數(shù)資料
| 型號： | AD5232BRU50 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 8-Bit Dual Nonvolatile Memory Digital Potentiometer |
| 中文描述： | DUAL 50K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16 |
| 封裝： | MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 268K |
| 代理商： | AD5232BRU50 |
REV. 0
–12–
AD5232
T able VI. Nominal Individual Segment Resistor Values (
)
Segment Resistor Size
for R
AB
End-to-End V alues
Version 50 k
10 k
Version 100 k
Version
8-Bit
78.10
390.5
781.0
PROGRAMMING T HE VARIABLE RE SIST OR
Rheostat Operation
T he nominal resistances of the RDAC between terminals A and B
are available with values of 10 k
, 50 k
, and 100 k
. T he final
digits of the part number determine the nominal resistance value,
e.g., 10 k
= 10; 100 k
= 100. T he nominal resistance (R
AB
) of
the AD5232 VR has 256 contact points accessed by the wiper
terminal, plus the B terminal contact. T he 8-bit data word in the
RDAC latch is decoded to select one of the 256 possible settings.
T he general transfer equation, which determines the digitally
programmed output resistance between Wx and Bx, is:
R
WB
(Dx)
=
(Dx)
/
2
N
×
R
BA
+
R
W
Where
N
is the resolution of the VR,
Dx
is the data contained in
the RDACx latch, and
R
BA
is the nominal end-to-end resistance.
For example, the following output resistance values will be set
for the following RDAC latch codes (applies to the 8-bit, 10 k
potentiometers):
(1)
T able VII. Nominal Resistance Value at Selected Codes for
R
AB
= 10 k
D (DE C)
255
128
1
0
R
WB
(V)
10011
5050
89
50
Output State
Full-Scale
Midscale
1 LSB
Zero-Scale
*
(Wiper Contact Resistance)
*
Note that in the zero-scale condition a finite wiper resistance of 50
is present. Care
should be taken to limit the current flow between W and B in this state to a
maximum continuous value of 2 mA to avoid degradation or possible destruc-
tion of the internal switch metalization. Intermittent current operation to
20 mA is allowed.
CODE
–
Decimal
100
75
00
256
64
P
E
–
A
128
192
50
25
R
WB
R
WA
Figure 10. Symmetrical RDAC Operation
Like the mechanical potentiometer the RDAC replaces, the
AD5232 parts are totally symmetrical. T he resistance between
the wiper W and terminal A also produces a digitally controlled
resistance R
WA
. Figure 10 shows the symmetrical programmabil-
ity of the various terminal connections. When these terminals
are used the B–terminal should be tied to the wiper. Setting the
resistance value for R
WA
starts at a maximum value of resistance
and decreases as the data loaded in the latch is increased in
value. T he general transfer equation for this operation is:
R
WA
(Dx)
=
(2
N
-Dx)
/
2
N
×
R
BA
+
R
W
where
N
is the resolution of the VR,
Dx
is the data contained in
the RDACx latch, and
R
BA
is the nominal end-to-end resistance.
For example, the following output resistance values will be set
for the following RDAC latch codes (applies to 8-bit, 10 k
potentiometers).
(2)
T able VIII. Nominal Resistance Value at Selected
Codes for R
AB
= 10 k
D (DE C)
R
WA
(W)
89
5050
10011
10050
Output State
255
128
1
0
Full-Scale
Midscale
1 LSB
Zero-Scale
T he multichannel AD5232 has a
±
0.2% typical distribution of
internal channel-to-channel R
BA
match. Device-to-device
matching is process-lot-dependent and exhibits a –40% to +20%
variation. T he change in R
BA
with temperature has a 600 ppm/
°
C
temperature coefficient.
Device
Resolution
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