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参数资料
| 型号： | AD5246BKS5-R2 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字电位计 |
| 英文描述： | 128-Position I2C Compatible Digital Resistor |
| 中文描述： | 5K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 128 POSITIONS, PDSO6 |
| 封装： | 2 X 2.10 MM, MO-203AB, SC-70, 6 PIN |
| 文件页数： | 12/20页 |
| 文件大小： | 991K |
| 代理商： | AD5246BKS5-R2 |
AD5246
OPERATION
The AD5246 is a 128-position, digitally controlled variable
resistor (VR) device. An internal power-on preset places the
wiper at midscale during power-on, which simplifies the default
condition recovery at power-up.
Rev. 0 | Page 12 of 20
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The nominal resistance of the RDAC between terminals A and
B is available in 5 k, 10 k, 50 k, and 100 k. The final two
or three digits of the part number determine the nominal
resistance value, e.g., 10 k = 10, 50 k = 50. The nominal
resistance (R
AB
) of the VR has 128 contact points accessed by
the wiper terminal, plus the B terminal contact. The 7-bit data
in the RDAC latch is decoded to select one of the 128 possible
settings.
Assuming a 10 k part is used, the wiper’s first connection
starts at the B terminal for data 0x00. Since there is a 50 wiper
contact resistance, such a connection yields a minimum of
100 (2 × 50 ) resistance between terminals W and B. The
second connection is the first tap point, which corresponds to
178 (R
WB
= R
AB
/128 + R
W
= 78 + 2 × 50 ) for data 0x01.
The third connection is the next tap point, representing 256
(2 × 78 + 2 × 50 ) for data 0x02, and so on. Each LSB data
value increase moves the wiper up the resistor ladder until the
last tap point is reached at 10,100 (R
AB
+ 2 × R
W
).
Figure 28 shows a simplified diagram of the equivalent RDAC
circuit.
Bx
Wx
Ax
D6
D5
D4
D3
D2
D1
D0
RDAC
LATCH
AND
DECODER
R
S
R
S
R
S
0
Figure 28. AD5246 Equivalent RDAC Circuit
The general equation determining the digitally programmed
output resistance between W and B is
W
AB
WB
R
R
D
D
R
×
+
×
=
2
128
)
(
(1)
where
D
is the decimal equivalent of the binary code loaded in
the 7-bit RDAC register,
R
AB
is the end-to-end resistance, and
R
W
is the wiper resistance contributed by the on resistance of
the internal switch. In summary, if
R
AB
= 10 k and the A
terminal is open-circuited, the output resistance
R
WB
shown in
Table 7 will be set for the indicated RDAC latch codes.
Table 7. Codes and Corresponding R
WB
Resistance
D (Dec.)
R
WB
()
Output State
127
10,100
Full Scale (R
AB
+ 2 × R
W
)
64
5,100
Midscale
1
178
1 LSB
0
100
Zero Scale (Wiper Contact Resistance)
Note that in the zero-scale condition, a finite wiper resistance of
100 is present. Care should be taken to limit the current flow
between W and B in this state to a maximum pulse current of
no more than 20 mA. Otherwise, degradation or possible
destruction of the internal switch contact can occur.
Typical device-to-device matching is process lot dependent and
may vary by up to ±30%. Since the resistance element is
processed in thin film technology, the change in R
AB
with
temperature has a very low 45 ppm/°C temperature coefficient.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5246BKS5-RL7 | 制造商:Analog Devices 功能描述:Digital Potentiometer 128POS 5KOhm Single 6-Pin SC-70 T/R 制造商:Rochester Electronics LLC 功能描述:7-BIT I2C DIG TRIMMER - Tape and Reel |
| AD5246BKSZ100-R2 | 功能描述:IC DGTL RES 100K I2C SC70-6 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) |
| AD5246BKSZ100-RL7 | 功能描述:IC DGTL RES 100K I2C SC70-6 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 |
| AD5246BKSZ10-R2 | 制造商:Analog Devices 功能描述:128 POSITION I2C COMPATIBLE PROGRAMMABLE RESISTOR IN SC70 PK - Tape and Reel |
| AD5246BKSZ10-RL7 | 功能描述:IC POT DGTL RES 128POS SC70-6 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 |
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