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參數(shù)資料
| 型號： | EVAL-AD5232SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD5232 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 數(shù)字電位器 |
| 已用 IC / 零件： | AD5232 |
| 主要屬性： | 2 通道，256 位置 |
| 次要屬性： | SPI 接口 |
| 已供物品： | 板，CD |
Data Sheet
AD5232
Rev. C | Page 19 of 24
Table 11. Nominal Individual Segment Resistor Values (Ω)
Device
Resolution
Segmented Resistor Size
for RAB End-to-End Values
10 kΩ
Version
50 kΩ
Version
100 kΩ
Version
8-Bit
78.10
390.5
781.0
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
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
W
AB
WB
R
D
R
256
)
(
(1)
where:
D
is the decimal equivalent of the data contained in the RDACx
register.
RAB
is the nominal resistance between Terminal A and Terminal B.
RW
is the wiper resistance.
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
RAB = 10 kΩ
D (Dec)
RWB (D) (Ω)
Output State
255
10011
Full scale
128
5050
Midscale
1
89
1 LSB
0
50
Zero scale1 (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, RWA. Figure 41 shows the symmetrical
programmability of the various terminal connections.
100
75
50
25
0
64
128
192
258
CODE (Decimal)
P
E
RCE
NT
O
F
NO
M
INAL
E
N
D-
T
O
-E
ND
RE
S
IS
T
ANCE
(
%
R
AB
)
0
261
8-
0
41
RWB
RWA
Figure 41. Symmetrical RDAC Operation
When these terminals are used, Terminal B should be tied to
the wiper. Setting the resistance value for RWA starts at a maximum
value of resistance and decreases as the data loaded in the latch
is increased in value. The general transfer equation for this
operation is
W
AB
WA
R
D
R
256
)
(
(2)
where:
D is the decimal equivalent of the data contained in the RDAC
register.
RAB is the nominal resistance between Terminal A and Terminal B.
RW is the wiper resistance.
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
RAB = 10 kΩ
D (Dec)
RWA (D) (Ω)
Output State
255
89
Full scale
128
5050
Midscale
1
10011
1 LSB
0
10050
Zero scale
The multichannel AD5232 has a ±0.2% typical distribution of
internal channel-to-channel RBA match. Device-to-device matching
is dependent on process lot and exhibits a 40% to +20% variation.
The change in RBA with temperature has a 600 ppm/°C temperature
coefficient.
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