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參數(shù)資料
| 型號(hào)： | AD5242BR10-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Audio digital potentiometers |
| 中文描述： | DUAL 10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16 |
| 封裝： | MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 394K |
| 代理商： | AD5242BR10-REEL7 |
REV. B
–9–
AD5241/AD5242
OPERATION
The AD5241/AD5242 provide a single-/dual-channel, 256-
position digitally controlled variable resistor (VR) device. The
terms VR, RDAC, and programmable resistor are commonly
used interchangeably to refer to digital potentiometer.
To program the VR settings, refer to the Digital Interface sec-
tion. Both parts have an internal power ON preset that places
the wiper in midscale during power-on, which simplifies the
fault condition recovery at power-up. In addition, the shutdown
SHDN
Pin of AD5241/AD5242 places the RDAC in an almost
zero power consumption state where Terminal A is open circuited
and Wiper W is connected to Terminal B, resulting in only
leakage current being consumed in the VR structure. During
shutdown, the VR latch contents are maintained when the RDAC
is inactive. When the part is returned from shutdown, the stored
VR setting will be applied to the RDAC.
SW
SHDN
SW
N
2–1
R
R
SW
N
2–2
RDAC
LAND
DECODER
R
R
AB
/2
N
B
W
DIGITAL CIRCUITRY
OMITTED FOR CLARITY
A
SW
1
SW
0
R
R
D7
D6
D5
D4
D3
D2
D1
D0
SHDN
Figure 4. Equivalent RDAC Circuit
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The nominal resistance of the RDAC between Terminals A and
B is available in 10 k
, 100 k
, and 1 M
. The final two or
three digits of the part number determine the nominal resistance
value, e.g., 10 k
= 10; 100 k
= 100; 1 M
= 1 M. The
nominal resistance (R
AB
) of the VR has 256 contact points
accessed by the Wiper Terminal, plus the B Terminal con-
tact. The 8-bit data in the RDAC latch is decoded to select
one of the 256 possible settings. Assume a 10 k
part is used;
the wiper’s first connection starts at the B Terminal for data
00
H
. Since there is a 60
wiper contact resistance, such con-
nection yields a minimum of 60
resistance between Terminals
W and B. The second connection is the first tap point that cor-
responds to 99
(R
WB
= R
AB
/256 + R
W
= 39 + 60) for data
01
H
. The third connection is the next tap point representing
138
(39
×
2 + 60) for data 02
H,
and so on. Each LSB data
value increase moves the wiper up the resistor ladder until the
last tap point is reached at 10021
[R
AB
– 1 LSB + R
W
].
Figure 4 shows a simplified diagram of the equivalent RDAC
circuit where the last resistor string will not be accessed; there-
fore, there is 1 LSB less of the nominal resistance at full scale in
addition to the wiper resistance.
The general equation determining the digitally programmed
resistance between W and B is:
R
D
( )
=
D
R
R
WB
AB
W
×
+
256
(1)
where:
D
is the decimal equivalent of the binary code between 0
and 255, which is loaded in the 8-bit RDAC register.
R
AB
is the nominal end-to-end resistance.
R
W
is the wiper resistance contributed by the on resistance
of the internal switch.
Again, if
R
AB
= 10 k
and the A Terminal can be either open
circuit or tied to W, the following output resistance at
R
WB
will
be set for the following RDAC latch codes.
FREQUENCY – Hz
6
–36
–42
–48
–54
G
100k
10k
1k
100
–30
–24
–18
–12
–6
0
FF
H
80
H
40
H
20
H
10
H
08
H
04
H
02
H
01
H
TPC 13. AD5242 100 k
Gain vs. Frequency vs. Code
FREQUENCY – Hz
6
–36
–42
–48
–54
G
100k
10k
1k
100
–30
–24
–18
–12
–6
0
FF
H
80
H
40
H
20
H
10
H
08
H
04
H
02
H
01
H
TPC 14. AD5242 1 M
Gain vs. Frequency vs. Code
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