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| 型号： | AD5260BRUZ20-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC DCP 1CH 20K SPI 14-TSSOP TR |
| 标准包装： | 1,000 |
| 接片： | 256 |
| 电阻（欧姆）： | 20k |
| 电路数： | 1 |
| 温度系数： | 标准值 35 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 4 线 SPI（芯片选择） |
| 电源电压： | 4.5 V ~ 16.5 V，±4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 带卷 (TR) |
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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相关代理商/技术参数 |
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|---|---|
| AD5260BRUZ50 | 功能描述:IC DGTL POT 50K SPI 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 接片:256 电阻（欧姆）:100k 电路数:1 温度系数:标准值 35 ppm/°C 存储器类型:非易失 接口:3 线串口 电源电压:2.7 V ~ 5.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN-EP（3x3） 包装:剪切带 (CT) 产品目录页面:1399 (CN2011-ZH PDF) 其它名称:MAX5423ETA+TCT |
| AD5260BRUZ50-REEL7 | 功能描述:IC DGTL POT SNGL 50K 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5262 | 制造商:AD 制造商全称:Analog Devices 功能描述:256-Position and 33-Position Digital Potentiometers |
| AD5262BRU20 | 功能描述:IC POT DUAL 20K 256POS 16TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5262BRU200 | 功能描述:IC POT DUAL 200K 256POS 16TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
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