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参数资料
| 型号： | AD5260BRU20 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字电位计 |
| 英文描述： | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| 中文描述： | 20K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO14 |
| 封装： | TSSOP-14 |
| 文件页数： | 15/20页 |
| 文件大小： | 859K |
| 代理商： | AD5260BRU20 |
REV. 0
–15–
AD5260/AD5262
A1
V
O
5V
V
IN
GND
2
V
OUT
5V
AD1582
U1
AD8601
1
3
A
W
B
AD5260
Figure 15. Programmable Voltage Reference
8-Bit Bipolar DAC
Figure 16 shows a low cost 8-bit bipolar DAC. It offers the same
number of adjustable steps but not the precision of conventional
DACs. The linearity and temperature coefficients, especially at low
values codes, are skewed by the effects of the digital potentiometer
wiper resistance. The output of this circuit is:
V
D
V
O
REF
=
-
ê
ˉ￥
2
256
1
(4)
5V
REF
OP2177
A2
–5V
OP2177
B
A
W
W1
A1
V
O
+5V
–5V
+5V
U2
+5V
REF
V
IN
GND
V
OUT
TRIM
AD5260
V
i
ADR425
R
R
U1
Figure 16. 8-Bit Bipolar DAC
Bipolar Programmable Gain Amplifier
For applications that require bipolar gain, Figure 17 shows one
implementation. Digital potentiometer U1 sets the adjustment
range. The wiper voltage at W2 can therefore be programmed
between V
i
and –KV
i
at a given U2 setting. Configuring A2
in
the noninverting mode allows linear gain and attenuation. The
transfer function is:
V
V
R
i
1
256
R
D
K
K
O
=
+
ê
ˉ￥
￥
+
(
)
-
ê
ˉ
1
2
2
1
(5)
where K is the ratio of R
WB1
/R
WA1
set by U1.
–KV
i
A1
B1
OP2177
A2
V
DD
V
SS
R1
R2
V
DD
V
SS
OP2177
A2
B2
W2
U2
AD5262
U1
AD5262
W1
A1
V
i
V
O
C1
Figure 17. Bipolar Programmable Gain Amplifier
Similar to the previous example, in the simpler (and much more
usual) case, where
K
= 1, a single digital pot AD5260, and U1
is replaced by a matched pair of resistors to apply
V
i
and –
V
i
at
the ends of the digital pot. The relationship becomes:
V
R
R
D
V
O
i
=
+
ê
ˉ
-
ê
ˉ￥
1
2
1
2 2
256
1
(6)
If R2 is large, a few picofarad compensation capacitors may be
needed to avoid any gain peaking.
Table VIII shows the result of adjusting D, with A2 configured as a
unity gain, a gain of 2, and a gain of 10. The result is a bipolar
amplifier with linearly programmable gain and 256-step resolution.
Table VIII. Result of Bipolar Gain Amplifier
D
R1
=
, R2 = 0
–1
–0.5
0
0.5
0.968
R1
= R2
–2
–1
0
1
1.937
R2
= 9R1
–10
–5
0
5
9.680
0
64
128
192
255
Programmable Voltage Source with Boosted Output
For applications that require high current adjustment such as a
laser diode driver or turnable laser, a boosted voltage source can
be considered (see Figure 18).
V
i
A1
V
O
W
U1
A
B
C
C
5V
SIGNAL
LO
N1
R1
10k
P1
R
BIAS
I
L
U1= AD5260
A1= AD8601, AD8605, AD8541
P1= FDP360P, NDS9430
N1= FDV301N, 2N7002
Figure 18. Programmable Boosted Voltage Source
In this circuit, the inverting input of the op amp forces the V
O
to be
equal to the wiper voltage set by the digital potentiometer. The
load current is then delivered by the supply via the P-Ch FET P1.
The N-Ch FET N
1
simplifies the op amp driving requirement.
A1 needs to be the rail-to-rail input type. Resistor R1 is needed to
prevent P1 from not turning off once it is on. The choice of R1 is a
balance between the power loss of this resistor and the output turn-
off time. N1 can be any general-purpose signal FET; on the other
hand, P1 is driven in the saturation state, and therefore its power
handling must be adequate to dissipate (V
i
– V
O
) I
L
power. This
circuit can source a maximum of 100 mA at 5 V supply. Higher
current can be achieved with P1 in a larger package. Note, a single
N-Ch FET can replace P1, N1, and R1 altogether. However, the out-
put swing will be limited unless separate power supplies are used.
For precision application, a voltage reference such as ADR423,
ADR292, and AD1584 can be applied at the input of the digital
potentiometer.
Programmable 4-to-20 mA Current Source
A programmable 4-to-20 mA current source can be implemented
with the circuit shown in Figure 19. REF191 is a unique low
supply headroom and high current handling precision reference
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| AD5260BRU200 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 200KOhm Single 14-Pin TSSOP 制造商:Analog Devices 功能描述:IC DIGITAL POTENTIOMETER 8-BIT |
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| AD5260BRU20-REEL7 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 20KOhm Single 14-Pin TSSOP T/R |
| AD5260BRU50 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 50KOhm Single 14-Pin TSSOP 制造商:Analog Devices 功能描述:IC 8 BIT ((NW)) 制造商:Analog Devices 功能描述:1-/2-Channel 15 V Digital Potentiometers 制造商:Analog Devices Inc. 功能描述:1-/2-Channel 15 V Digital Potentiometers |
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