参数资料
| 型号： | AD5231BRU50 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 1024POS 16-TSSOP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 96 |
| 接片： | 1024 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 600 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 4 线 SPI（芯片选择） |
| 电源电压： | 2.7 V ~ 5.5 V，±2.25 V ~ 2.75 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
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Data Sheet
AD5231
Rev. D | Page 23 of 28
APPLICATIONS
BIPOLAR OPERATION FROM DUAL SUPPLIES
The AD5231 can be operated from dual supplies ±2.5 V, which
enables control of ground referenced ac signals or bipolar
operation. AC signals as high as VDD/VSS can be applied directly
across Terminal A to Terminal B with output taken from
Terminal W. See Figure 46 for a typical circuit connection.
±2.5V p-p
AD5231
VSS
GND
SDI
CLK
SS
SCLK
MOSI
GND
C
±1.25V p-p
VDD
+2.5V
–2.5V
CS
D = MIDSCALE
A
W
B
02739-
045
Figure 46. Bipolar Operation from Dual Supplies
HIGH VOLTAGE OPERATION
The digital potentiometer can be placed directly in the feedback
or input path of an op amp for gain control, provided that the
voltage across Terminals A–B, Terminals W–A, or Terminals
W–B does not exceed |5 V|. When high voltage gain is needed,
users should set a fixed gain in an op amp operated at a higher
voltage and let the digital potentiometer control the adjustable
input. Figure 47 shows a simple implementation.
R
2R
5V
AD5231
A
W
B
15V
V+
V–
VO
0V TO 15V
A1
–
+
CC
2.2pF
02739-
046
Figure 47. 15 V Voltage Span Control
BIPOLAR PROGRAMMABLE GAIN AMPLIFIER
There are several ways to achieve bipolar gain. Figure 48 shows
one versatile implementation. Digital potentiometer U1 sets the
adjustment range; the wiper voltage VW2 can, therefore, be
programmed between Vi and KVi at a given U2 setting. For
linear adjustment, configure A2 as a noninverting amplifier and
the transfer function becomes
+
×
+
=
K
D
R1
R2
V
2
I
O
)
1
(
1024
1
(4)
where:
K is the ratio of RWB/RWA that is set by U1.
D is the decimal equivalent of the input code.
V+
V–
OP2177
AD5231
V+
V–
OP2177
AD5231
Vi
A
W
B
–KVi
A
B
W
VDD
VO
VSS
R1
R2
A
U2
A2
U1
CC
2.2pF
VDD
VSS
02739-
047
Figure 48. Bipolar Programmable Gain Amplifier
In the simpler (and much more usual) case where K = 1,
a pair of matched resistors can replace U1. Equation 4 can be
simplified to
×
+
=
1
1024
2
1
2
D
R1
R2
V
I
O
(5)
Table 20 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 1024-step
resolution.
Table 20. Result of Bipolar Gain Amplifier
D
R1 = ∞, R2 = 0
R1 = R2
R2 = 9 × R1
0
1
2
10
256
0.5
1
5
512
0
768
0.5
1
5
1023
0.992
1.984
9.92
10-BIT BIPOLAR DAC
If the circuit in Figure 48 is changed with the input taken from a
voltage reference and A2 configured as a buffer, a 10-bit bipolar
DAC can be realized. Compared to the conventional DAC, this
circuit offers comparable resolution but not the precision
because of the wiper resistance effects. Degradation of the
nonlinearity and temperature coefficient is prominent near
both ends of the adjustment range. On the other hand, this
circuit offers a unique nonvolatile memory feature that in some
cases outweighs any shortfall in precision.
The output of this circuit is
REF
O
V
D
V
×
=
1
1024
2 2
(6)
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| AD5231BRU50-REEL7 | 功能描述:IC DGTL POT 1024POS 16-TSSOP TR RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:2,500 系列:XDCP™ 接片:256 电阻（欧姆）:100k 电路数:1 温度系数:标准值 ±300 ppm/°C 存储器类型:非易失 接口:I²C（设备位址） 电源电压:2.7 V ~ 5.5 V 工作温度:0°C ~ 70°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) |
| AD5231BRUZ10 | 功能描述:IC POT DGTL 1024POS 16-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 |
| AD5231BRUZ10 | 制造商:Analog Devices 功能描述:Digital Potentiometer (Pots) IC |
| AD5231BRUZ100 | 功能描述:IC DGTL POT 100K SPI 16-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 |
| AD5231BRUZ100-RL7 | 功能描述:IC DGTL POT 100K 16-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) |
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