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參數(shù)資料
| 型號(hào)： | EVAL-AD5262EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5262 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 數(shù)字電位器 |
| 已用 IC / 零件： | AD5262 |
| 主要屬性： | 雙通道，256 位置 |
| 次要屬性： | SPI 接口 |
| 已供物品： | 板 |
AD5260/AD5262
Rev. A | Page 21 of 24
–5V
OP1177
+
–
U2
+5V
RS
102
RL
100
VL
IL
A
B W
AD5260
C1
1F
GND
REF191
SLEEP
VS
OUTPUT
+5V
U1
2
3
4
6
0V TO (2.048V + VL)
–2.048 TO VL
0
2695-
0
64
Figure 64. Programmable 4-to-20 mA Current Source
The circuit is simple, but be aware that dual-supply op amps are
ideal because the ground potential of REF191 can swing from
2.048 V at zero scale to VL at full scale of the potentiometer
setting. Although the circuit works under single supply, the
programmable resolution of the system is reduced.
PROGRAMMABLE BIDIRECTIONAL CURRENT
SOURCE
For applications that require bidirectional current control or
higher voltage compliance, a Howland current pump can be a
solution (see Figure 65). If the resistors are matched, the load
current is
()
W
L
V
B
R
R1
B
R
A
R
I
×
+
=
2
(8)
AD8016
+15V
–15V
+5V
–5V
OP2177
AD5260
A1
W
A
B
C2
10pF
R1'
150k
R1
150k
R2'
15k
A2
C1
10pF
R2A
14.95k
RL
500
RL
50
+15V
–15V
VL
IL
0
26
95-
065
Figure 65. Programmable Bidirectional Current Source
PROGRAMMABLE LOW-PASS FILTER
Digital Potentiometer AD5262 can be used to construct a
second-order, Sallen-Key low-pass filter (see Figure 66). The
design equations are
2
O
i
O
S
Q
S
V
ω
+
=
(9)
R1R2C1C2
O
1
=
ω
(10)
R2C2
R1C1
Q
1
+
=
(11)
Users can first select any convenient value for the capacitors. To
achieve maximally flat bandwidth where Q = 0.707, let C1 be
twice the size of C2 and let R1 = R2. As a result, users can adjust
R1 and R2 to the same settings to achieve the desirable bandwidth.
A
B
Vi
AD8601
+2.5V
VO
–2.5V
W
R
R2
R1
A
B
W
R
C1
C2
ADJUSTED TO
SAME SETTINGS
02
69
5
-06
6
Figure 66. Sallen Key Low-Pass Filter
PROGRAMMABLE OSCILLATOR
In a classic Wien-bridge oscillator (see Figure 67), the Wien
network (R, R’, C, C’) provides positive feedback, whereas R1
and R2 provide negative feedback. At the resonant frequency, fo,
the overall phase shift is zero, and the positive feedback causes
the circuit to oscillate. With R = R’, C = C’, and R2 = R2A//(R2B +
RDIODE), the oscillation frequency is
RC
O
1
=
ω
or
RC
f
O
π
2
1
=
(12)
where R is equal to RWA such that
AB
R
D
R
256
256
=
(13)
At resonance, setting
2
=
R1
R2
(14)
balances the bridge. In practice, R2/R1 should be set slightly
larger than 2 to ensure the oscillation can start. However, the
alternate turn-on of the diodes, D1 and D2, ensures R2/R1 to
be smaller than 2 momentarily and therefore stabilizes the
oscillation.
When the frequency is set, the oscillation amplitude can be
tuned by R2B because
D
O
V
B
R
I
V
+
=
2
3
2
(15)
VO, ID, and VD are interdependent variables. With proper
selection of R2B, an equilibrium is reached such that VO
converges. R2B can be in series with a discrete resistor to
increase the amplitude, but the total resistance cannot be too
large to saturate the output.
In both circuits in Figure 66 and Figure 67, the frequency tuning
requires that both RDACs be adjusted to the same settings.
Because the two channels are adjusted one at a time, an intermedi-
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