参数资料
| 型号： | AD5263BRU50 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC POT QUAD 50K 256POS 24-TSSOP |
| 标准包装： | 62 |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 4 |
| 温度系数： | 标准值 30 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | I²C，SPI（芯片选择，设备位址） |
| 电源电压： | 2.7 V ~ 5.5 V，5 V ~ 15 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
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AD5263
Data Sheet
Rev. F | Page 26 of 28
PROGRAMMABLE LOW-PASS FILTER
In analog-to-digital conversion applications, it is common to
include an antialiasing filter to band-limit the sampling signal.
Dual-channel digital potentiometers can be used to construct a
second-order Sallen-Key low-pass filter (see Figure 65). The design
equations are
2
O
I
O
S
Q
S
V
ω
+
=
(10)
C2
C1
R2
R1
O
×
=
1
ω
(11)
C2
R2
C1
R1
Q
×
+
×
=
1
(12)
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, the user can adjust
R1 and R2 to the same settings to achieve the desired bandwidth.
03142-
064
VI
U1
VO
R1
A
R
W
B
R2
A
R
W
B
C2
C
C1
C
+2.5V
V+
V–
–2.5V
AD8601
ADJUSTED TO
SAME SETTING
Figure 65. Sallen-Key Low-Pass Filter
PROGRAMMABLE OSCILLATOR
In a classic Wien bridge oscillator (Figure 66), the Wien network
(R, R′, C, C′) provides positive feedback, while 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
fO
π
2
1
=
(13)
where R is equal to RWA, such that
AB
R
D
R
256
256
=
(14)
At resonance, setting
2
=
R1
R2
(15)
balances the bridge. In practice, R2/R1 should be set slightly
greater than 2 to ensure that the oscillation can start. On the
other hand, the alternating turn-on of the diodes D1 and D2
ensures that R2/R1 is momentarily less than 2, thereby
stabilizing the oscillation.
Once the frequency is set, the oscillation amplitude can be
tuned by R2B because
D
O
V
R2B
I
V
+
×
=
3
2
(16)
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 should not be so large that it saturates
the output.
03142-
065
FREQUENCY
ADJUSTMENT
2.2nF
C
2.2nF
R’
10k
R
10k
B
A
W
V+
V–
B
W
D1
D2
VO
U1
VP
A
VN
–2.5V
+2.5V
R1
1k
R2B
10k
R2A
2.1k
R1 = R1’ = R2B = AD5263
D1 = D2 = 1N4148
AMPLITUDE
ADJUSTMENT
OP1177
Figure 66. Programmable Oscillator with Amplitude Control
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相关代理商/技术参数 |
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| AD5263BRU50-REEL7 | 功能描述:IC DGTL POT QUAD 256POS 24-TSSOP 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) |
| AD5263BRUZ20 | 功能描述:IC DGTL POT QUAD 20K 24-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 |
| AD5263BRUZ20 | 制造商:Analog Devices 功能描述:DIG POT, QUAD, 256, 15V, 20KOHM, 24TSSOP; End To End Resistance:20kohm; Track Taper:Linear; Resistance Tolerance: 30%; Supply Voltage Min:4.5V; Supply Voltage Max:16.5V; Potentiometer IC Case Style:TSSOP; No. of Pins:24; No. of ;RoHS Compliant: Yes |
| AD5263BRUZ200 | 功能描述:IC POT QUAD 200K 256POS 24-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 |
| AD5263BRUZ200-R7 | 制造商:Analog Devices 功能描述:QUAD, 15 V, 256-POSITION DIGITAL POTENTIOMETER WITH PIN-SELE - Tape and Reel |
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