- 您现在的位置：买卖IC网 > PDF目录373875 > AD5260BRU200-REEL7 (ANALOG DEVICES INC) 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 PDF资料下载
参数资料
| 型号： | AD5260BRU200-REEL7 |
| 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： | 200K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO14 |
| 封装： | TSSOP-14 |
| 文件页数： | 16/20页 |
| 文件大小： | 859K |
| 代理商： | AD5260BRU200-REEL7 |
REV. 0
–16–
AD5260/AD5262
that can deliver 20 mA at 2.048 V. The load current is simply the
voltage across terminals B-to-W of the digital pot divided by R
S
.
V
D
R
S
I
L
REF
=
￥
(7)
–5V
V
OUT
OP1177
+
–
U2
+5V
R
L
100
R
S
102
V
L
I
L
A
BW
AD5260
C1
1 F
GND
4
REF191
SLEEP
V
IN
5V
2
U1
3
6
0 TO (2.048 V
L
)
–2.048V TO V
L
Figure 19. 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 V
L
at full scale of the potentiometer
setting. Although the circuit works under single supply, the pro-
grammable resolution of the system will be 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 20). If the resistors are matched, the load current is:
(
￥
2
I
R A
2
R B R
R B
V
L
W
=
+
2
1
/
(8)
–5V
+5V
AD8016
–15V
+15V
–15V
OP2177
AD5260
A1
V
L
W
A
B
C2
10pF
I
L
R1
150k
R1
150k
A2
C1
10pF
R2
15k
R2A
14.95k
R
L
500
R
L
50
+15V
Figure 20. 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 21). The design
equations are:
2
V
V
S
Q
S
O
i
O
O
O
=
+
+
w
w
w
2
2
(9)
w
O
1 2 1 2
=
1
(10)
Q
1 1
R2 2
=
+
1
1
(11)
Users can first select some convenient values 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
V
i
AD8601
+2.5V
V
O
–2.5V
W
R
R2
R1
A
B
W
R
C1
C2
ADJUSTED TO
SAME SETTINGS
Figure 21. Sallen Key Low-Pass Filter
Programmable Oscillator
In a classic Wien-bridge oscillator, Figure 22, the Wien network
(R, R
’
, C, C
’
) provides positive feedback, while R1 and R2
provide negative feedback. At the resonant frequency, f
o
, the
overall phase shift is zero, and the positive feedback causes the
circuit to oscillate. With R = R
’
, C = C
’
, and R2 = R2A//(R2B+
R
DIODE
), the oscillation frequency is:
1
1
2
where
R
is equal to
R
WA
such that:
DR
AB
256
At resonance, setting
R
R
1
balances the bridge. In practice, R2/R1 should be set slightly larger
than 2 to ensure the oscillation can start. On the other hand, the
alternate turn-on of the diodes D1 and D2 ensures R2/R1 to be
smaller than 2 momentarily and therefore stabilizes the oscillation.
Once the frequency is set, the oscillation amplitude can be tuned
by R2B since:
w
p
O
O
RC
f
RC
=
=
or
(12)
R
=
256
–
(13)
2
2
=
(14)
2
3
2
V
I R B V
O
D
=
(15)
相关PDF资料 |
PDF描述 |
|---|---|
| AD5260BRU50-REEL7 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| AD5262BRU50-REEL7 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| AD5263BRU20 | Preliminary Technical Data |
| AD5263BRU20-REEL7 | 10 Bit, 65MSPS ADC, 1.8V, Int/Ext Ref, w/Power-Down 48-TQFP -40 to 85 |
| AD5263BRU200 | Preliminary Technical Data |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| AD5260BRU50-REEL7 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 50KOhm Single 14-Pin TSSOP T/R |
| AD5260BRUZ20 | 功能描述:IC DCP 1CH 20K 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 |
| AD5260BRUZ20 | 制造商:Analog Devices 功能描述:IC 8-BIT DIGITAL POT |
发布紧急采购，3分钟左右您将得到回复。