参数资料
| 型号： | AD5263BRU50 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
Data Sheet
AD5263
Rev. F | Page 25 of 28
PROGRAMMABLE 4 TO 20 MA CURRENT SOURCE
A programmable 4–20 mA current source can be implemented
with the circuit shown in Figure 63. The REF191 is a unique low
supply headroom and high current handling precision reference
that can deliver 20 mA at +2.048 V. The load current is simply
the voltage across Terminal B to Terminal W of the digital
potentiometer divided by RS:
N
S
REF
L
R
D
V
I
2
×
=
(7)
03142-
062
–2.048V TO VL
0 TO (2.048V + VL)
+5V
2
3
+5V
U1
4
U2
–5V
VL
RS
102
RL
100
REF191
GND
VIN
VOUT
SLEEP
AD5263
C1
1F
6
A
B
W
IL
OP8510
V+
V–
Figure 63. Programmable 4–20 mA Current Source
The circuit is simple, but beware of two things. First, dual-supply
op amps are ideal because the ground potential of the REF191
can swing from 2.048 V at zero scale to VL at full scale of the
potentiometer setting. Although the circuit works with a single
supply, the programmable resolution of the system is reduced.
For applications that demand higher current capabilities, a few
changes to the circuit in Figure 63 produce an adjustable current in
the range of hundreds of mA. First, the voltage reference needs
to be replaced with a high current, low dropout regulator, such
as the ADP3333, and the op amp needs to be swapped with a
high current, dual-supply model, such as the AD5263. Depending
on the desired range of current, an appropriate value for RS
must be calculated. Because of the high current flowing to the
load, the user must pay attention to the load impedance so as
not to drive the op amp past the positive rail.
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 64). If the resistors are matched, the load
current is
W
L
V
R2B
R1
R2B
R2A
I
×
+
=
)
(
(8)
03142-
063
AD5263
+5V
R1
150k
R2A
14.95k
|L
R2B
50
R2
15k
C1
10pF
C2
10pF
R1
150k
VL
RL
500
A2
+15V
A
W
V+
OP2177
V–
V+
V–
A1
–5V
–15V
Figure 64. Programmable Bidirectional Current Source
R2B, in theory, can be made as small as needed to achieve the
current needed within the A2 output current driving capability.
In this circuit, OP2177 can deliver ±5 mA in either direction,
and the voltage compliance approaches +15 V. It can be shown
that the output impedance is
)
(
)
(
2
R2B
R2A
1
R
2
R
R1
R2A
R1
B
R
1
R
Zo
+
′
′
×
+
×
′
=
(9)
This output impedance can be infinite if resistors R1′ and R2′
match precisely with R1 and R2A + R2B, respectively. On the
other hand, it can be negative if the resistors are not matched.
As a result, C1 in the range of 1 pF to 10 pF is needed to prevent
oscillation.
相关PDF资料 |
PDF描述 |
|---|---|
| MS27467E25F35PB | CONN PLUG 128POS STRAIGHT W/PINS |
| MS3450L20-33P | CONN RCPT 11POS WALL MNT W/PINS |
| M83723/76W18149 | CONN PLUG 14POS STRAIGHT W/PINS |
| VI-B74-MW-B1 | CONVERTER MOD DC/DC 48V 100W |
| DS1135Z-30+T&R | IC DELAY LINE 30NS 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。