SWSHDN SW
參數(shù)資料
型號(hào)： AD5201BRMZ10
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 4/15頁(yè)
文件大?。?/td> 0K
描述： IC DGTL POT 10K 33POS 10-MSOP
標(biāo)準(zhǔn)包裝： 50
接片： 33
電阻（歐姆）： 10k
電路數(shù)： 1
溫度系數(shù)： 標(biāo)準(zhǔn)值 500 ppm/°C
存儲(chǔ)器類型： 易失
接口： 3 線串行（芯片選擇）
電源電壓： 2.7 V ~ 5.5 V，±2.3 V ~ 2.7 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 管件
AD5200/AD5201
–12–
D7
D6
D5
D4
D3
D2
D1
D0
RDAC
LATCH &
DECODER
SHDN
SWSHDN
SW2N 1
SW2N 2
SW1
SW0
A
R
B
W
DIGITAL CIRCUITRY
OMITTED FOR CLARITY
R
RAB
2N–1
Figure 2a. AD5200 Equivalent RDAC Circuit. 255 positions
can be achieved up to Switch SW 2
N
–1.
SW2N 1
D5
D4
D3
D2
D1
D0
RDAC
LATCH &
DECODER
SW2N 2
SW1
SW0
R
B
W
DIGITAL CIRCUITRY
OMITTED FOR CLARITY
SHDN
A
SWSHDN
SW2N
R
RAB
2N
Figure 2b. AD5201 Equivalent RDAC Circuit. Unlike AD5200,
33 positions can be achieved all the way to Switch SW 2
N.
The general equation determining the digitally programmed
output resistance between W and B is:
RD
D
R
WB
AB
() =+
255
50
for AD5200
(1)
RD
D
R
WB
AB
() =+
32
50
for AD5201
(2)
where:
D
is the decimal equivalent of the data contained in
RDAC latch.
RAB is the nominal end-to-end resistance.
RW is the wiper resistance contributed by the on-resistance
of the internal switch.
Note D in AD5200 is between 0 to 255 for 256 positions. On
the other hand, D in AD5201 is between 0 to 32 so that 33
positions can be achieved due to the slight internal structure
difference, Figure 2b.
Again if RAB = 10 k
and A terminal can be opened or tied to
W, the following output resistance between W to B will be set
for the following RDAC latch codes:
AD5200 Wiper-to-B Resistance
DRWB
(DEC)
( )
Output State
255
10050
Full-Scale (RAB + RW)
128
5070
Midscale
189
1 LSB
0
50
Zero-Scale (Wiper Contact Resistance)
AD5201 Wiper-to-B Resistance
DRWB
(DEC)
( )
Output State
32
10050
Full-Scale (RAB + RW)
16
5050
Midscale
1
363
1 LSB
0
50
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 no more than
±20 mA to avoid
degradation or possible destruction of the internal switch contact.
Like the mechanical potentiometer the RDAC replaces, it is
totally symmetrical. The resistance between the wiper W and
Terminal A also produces a digitally controlled resistance RWA.
When these terminals are used, the B terminal should be tied to
the wiper. Setting the resistance value for RWA starts at a maxi-
mum value of resistance and decreases as the data loaded in
the latch is increased in value. The general equation for this
operation is:
RD
D
R
WA
AB
() =
()
+
255
50
for AD5200
(3)
RD
D
R
WA
AB
() =
()
+
32
50
for AD5201
(4)
Similarly, D in AD5200 is between 0 to 255, whereas D in
AD5201 is between 0 to 32.
For RAB = 10 k
and B terminal is opened or tied to the wiper
W, the following output resistance between W and A will be set
for the following RDAC latch codes:
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