參數(shù)資料
型號： AD8400AR100-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 14/32頁
文件大小： 0K
描述： IC POT DIG SGLE 100K 8BIT 8SOIC
標準包裝： 2,500
接片： 256
電阻（歐姆）： 100k
電路數(shù)： 1
溫度系數(shù)： 標準值 500 ppm/°C
存儲器類型： 易失
接口： 3 線 SPI（芯片選擇）
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
AD8400/AD8402/AD8403
Rev. E | Page 21 of 32
Like a mechanical potentiometer, RDAC is symmetrical. The
resistance between the Wiper W and Terminal A also produces
a digitally controlled complementary resistance, RWA. When
these terminals are used, the B terminal can be tied to the wiper
or left floating. RWA starts at the maximum and decreases as the
data loaded into the RDAC latch increases. The general transfer
equation for this RWA is
()
W
AB
WA
R
D
R
+
×
=
256
(3)
where D is the data loaded into the 8-bit RDAC# latch, and RAB
is the nominal end-to-end resistance.
For example, when the B terminal is either open-circuited or
tied to the Wiper W, the following RDAC latch codes result in
the following RWA (for the 10 kΩ version):
Table 11.
D (Dec)
RWA (
)
Output State
255
89
Full-Scale
128
5,050
Midscale (RS = 0 Condition)
1
10,011
1 LSB
0
10,050
Zero-Scale
The typical distribution of RAB from channel to channel
matches within ±1%. However, device-to-device matching
is process lot dependent and has a ±20% variation. The tem-
perature coefficient, or the change in RAB with temperature,
is 500 ppm/°C.
The wiper-to-end-terminal resistance temperature coefficient
has the best performance over the 10% to 100% of adjustment
range where the internal wiper contact switches do not con-
tribute any significant temperature related errors. The graph in
Figure 18 shows the performance of RWB tempco vs. code. Using
the potentiometer with codes below 32 results in the larger
temperature coefficients plotted.
PROGRAMMING THE POTENTIOMETER DIVIDER
Voltage Output Operation
The digital potentiometer easily generates an output voltage
proportional to the input voltage applied to a given terminal.
For example, connecting the A terminal to 5 V and the B termi-
nal to ground produces an output voltage at the wiper starting
at 0 V up to 1 LSB less than 5 V. Each LSB is equal to the voltage
applied across the A to B terminals divided by the 256-position
resolution of the potentiometer divider. The general equation
defining the output voltage with respect to ground for any given
input voltage applied to the A to B terminals is
B
AB
W
V
D
V
+
×
=
256
(4)
Operation of the digital potentiometer in the voltage divider
mode results in more accurate operation over temperature.
Here the output voltage is dependent on the ratio of the internal
resistors, not the absolute value; therefore, the temperature drift
improves to 15 ppm/°C.
At the lower wiper position settings, the potentiometer divider
temperature coefficient increases because the contribution of
the CMOS switch wiper resistance becomes an appreciable
portion of the total resistance from the B terminal to the
Wiper W. See Figure 17 for a plot of potentiometer tempco
performance vs. code setting.
DIGITAL INTERFACING
The AD8400/AD8402/AD8403 contain a standard SPI-
compatible, 3-wire, serial input control interface. The three
inputs are clock (CLK), chip select (CS), and serial data input
(SDI). The positive-edge sensitive CLK input requires clean
transitions to avoid clocking incorrect data into the serial input
register. For the best result, use logic transitions faster than
1 V/μs. Standard logic families work well. If mechanical switches
are used for product evaluation, they should be debounced by
a flip-flop or other suitable means. The block diagrams in
, and
show the internal digital
circuitry in more detail. When
CS is taken active low, the clock
loads data into the 10-bit serial register on each positive clock
edge (see
).
RDAC
LATCH
NO. 1
GND
A1
W1
B1
VDD
AD8400
CS
CLK
8
D7
D0
EN
ADDR
DEC
A1
A0
SDI
DI
D0
D7
10-BIT
SER
REG
0
10
92
-0
45
Figure 46. AD8400 Block Diagram
RDAC
LATCH
NO. 1
R
AGND
RS
A1
W1
B1
VDD
AD8402
CS
CLK
D7
D0
RDAC
LATCH
NO. 2
R
A4
W4
B4
D7
D0
EN
ADDR
DEC
A1
A0
SDI
DI
10-BIT
SER
REG
D0
SHDN
DGND
D7
8
01
09
2-
04
6
Figure 47. AD8402 Block Diagram
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