- 您现在的位置：买卖IC网 > PDF目录373875 > AD5262BRU200-REEL7 (ANALOG DEVICES INC) 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 PDF资料下载
参数资料
| 型号： | AD5262BRU200-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： | DUAL 200K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16 |
| 封装： | TSSOP-16 |
| 文件页数： | 9/20页 |
| 文件大小： | 859K |
| 代理商： | AD5262BRU200-REEL7 |
REV. 0
–9–
AD5260/AD5262
D7
D6
D5
D4
D3
D2
D1
D0
RDAC
LATCH
AND
DECODE
Ax
Wx
Bx
R
S
= R
AB
/2
N
R
S
R
S
R
S
R
S
SHDN
DIGITAL CIRCUITRY
OMITTED FOR CLARITY
Figure 11. Simplified RDAC Architecture
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The nominal resistances of the RDAC between terminals A and B
are available with values of 20 k
W
, 50 k
W
, and 200 k
W
. The final
three digits of the part number determine the nominal resistance
value, e.g., 20 k
W
= 20; 50 k
W
= 50; 200 k
W
= 200. The nominal
resistance (R
AB
) of the VR has 256 contact points accessed by the
wiper terminal, plus the B terminal contact. The 8-bit data in the
RDAC latch is decoded to select one of the 256 possible settings.
Assuming a 20 k
W
part is used, the wiper’s first connection starts
at the B terminal for data 00
H
. Since there is a 60
W
wiper contact
resistance, such connection yields a minimum of 60
W
resistance
between terminals W and B. The second connection is the first tap
point corresponds to 138
W
(R
WB
= R
AB
/256 R
W
= 78
W
60
W
)
for data 01
H
. The third connection is the next tap point represent-
ing 216
W
(78
2 60) for data 02
H
and so on. Each LSB data
value increase moves the wiper up the resistor ladder until the last
tap point is reached at 19982
W
[R
AB
1 LSB R
W
]. The wiper
does not directly connect to the B terminal. See Figure 11 for a
simplified diagram of the equivalent RDAC circuit.
The general equation determining the digitally programmed
output resistance between W and B is:
R
D
( )
=
D
R
R
WB
AB
W
￥
+
256
(1)
where D is the decimal equivalent of the binary code which is
loaded in the 8-bit RDAC register, and R
AB
is the nominal end-
to-end resistance.
For example, R
AB
= 20 k
W
, when V
B
= 0 V and A–terminal is
open circuit, the following output resistance values R
WB
will be
set for the following RDAC latch codes. The result will be the
same if terminal A is tied to W:
D
(DEC)
R
WB
(
W
)
19982
10060
138
60
Output State
256
128
1
0
Full-Scale (R
AB
– 1 LSB + R
W
)
Mid-Scale
1 LSB
Zero-Scale (wiper contact resistance)
Note that in the zero-scale condition a finite wiper resistance of
60
W
is present. Care should be taken to limit the current flow
between W and B in this state to no more than 20 mA to avoid
degradation or possible destruction of the internal switches.
Like the mechanical potentiometer the RDAC replaces, the
AD5260/AD5262 parts are totally symmetrical. The resistance
between the wiper W and terminal A also produces a digitally
controlled complementary resistance R
WA
. Figure 12 shows the
symmetrical programmability of the various terminal connections.
When R
WA
is used, the B–terminal can be let floating or tied to the
wiper. Setting the resistance value for R
WA
starts at a maximum
value of resistance and decreases as the data loaded in the latch
is increased in value. The general equation for this operation is:
R
D
( )
=
D
R
R
WA
AB
W
-
￥
+
256
256
(2)
For example, R
AB
= 20 k
W
, when V
A
= 0 V and B–terminal is open,
the following output resistance R
WA
will be set for the following
RDAC latch codes. The result will be the same if terminal B is
tied to W:
D
(DEC)
R
WA
(
W
)
60
10060
19982
20060
Output State
256
128
1
0
Full-Scale
Mid-Scale
1 LSB
Zero-Scale
R
WB
R
WA
R
AB
= 20K
D – CODE in decimal
20
0
64
128
192
256
R
W
(
W
(
16
12
8
4
0
Figure 12. AD5260/AD5262 Equivalent RDAC Circuit
The typical distribution of the nominal resistance R
AB
from
channel to channel matches within
±
1%. Device-to-device match-
ing is process lot dependent with the worst case of
±
30% variation.
On the other hand, since the resistance element is processed in
thin film technology, the change in R
AB
with temperature has a
low 35 ppm/
∞
C temperature coefficient.
相关PDF资料 |
PDF描述 |
|---|---|
| AD5260BRU20 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| AD5260BRU20-REEL7 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| AD5260BRU200 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| AD5260BRU200-REEL7 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| AD5260BRU50-REEL7 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5262BRU20-REEL7 | 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) |
| AD5262BRU20Z | 制造商:Analog Devices 功能描述:DIG POT 2CH 256 15V 20KOHM 制造商:Analog Devices 功能描述:DIG POT, 2CH, 256, 15V, 20KOHM, 16TSSOP; 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:16; No. of ;RoHS Compliant: Yes |
| AD5262BRU50 | 功能描述:IC POT DUAL 50K 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) |
| AD5262BRU50-REEL7 | 功能描述:IC POT DUAL 50K 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) |
| AD5262BRU50Z | 制造商:Analog Devices 功能描述:DIG POT 2CH 256 15V 50KOHM 制造商:Analog Devices 功能描述:DIG POT, 2CH, 256, 15V, 50KOHM, 16TSSOP; End To End Resistance:50kohm; Track Taper:Linear; Resistance Tolerance: 30%; Supply Voltage Min:4.5V; Supply Voltage Max:16.5V; Potentiometer IC Case Style:TSSOP; No. of Pins:16; No. of ;RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。