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参数资料
| 型号： | AD5251BRU50-RL7 |
| 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 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO14 |
| 封装： | MO-153AB-1, TSSOP-14 |
| 文件页数： | 24/28页 |
| 文件大小： | 859K |
| 代理商： | AD5251BRU50-RL7 |
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AD5251/AD5252
APPLICATIONS
LCD PANEL V
COM
ADJUSTMENT
Large LCD panels usually require an adjustable V
COM
voltage
centered around 6 V to 8 V with ±1 V swing and small steps
adjustment. This example represents common DAC appli-
cations where the window of adjustments is small and centered
at any level. High voltage and high resolution DACs can be used
but it is far more cost-effective to use low voltage digital
potentiometers with level shifting, such as the AD5251 or
AD5252, to achieve the objective.
Rev. 0 | Page 24 of 28
U1
V
1
R
SENSE
RDAC1
10k
RDAC3
10k
B
B
AD5252
AD8628
V–
U2
V
O
VREF
+5V
V+
0
V
2
Assume a V
COM
voltage requirement of 6 V ±1 V with a ±20 mV
step adjustment, as shown in Figure 44. The AD5252 can be
configured in voltage divider mode with an op amp gain. With
±20% tolerance accounted for by the AD5252, this circuit can
still be adjusted from 5 V to 7 V with an 8 mV/step in the
worst case.
Figure 45. Current-Sensing Amplifier.
ADJUSTABLE HIGH POWER LED DRIVER
Figure 46 shows a circuit that can drive three to four high power
LEDs. The ADP1610 is an adjustable boost regulator that
provides adequate headroom and current for the LEDs. Because
its FB pin voltage is 1.2 V, the digital potentiometer AD5252
and the op amp form an average gain of 12 feedback networks
that servo the sensing and feedback voltages. As a result, the
voltage across R
SET
is regulated around 0.1 V, depending on the
AD5252’s setting. An adjustable LED current is
V
DD
U1
U2
V
COM
+5V
R2
10k
R4
6k
R3
18.5k
R5
1k
R1
350k
C1
2.2p
B
AD5252
+14.4V
+14.4V
±
20%
±
1%
6V
±
1V
V+
V–
0
SET
R
LED
R
V
I
SET
=
(9)
R
SET
should be small to conserve power but large enough to
limit the maximum LED current. R3 should also be used in
parallel with the AD5252 to limit the LED current within an
achievable range.
Figure 44. Apply 5 V Digital Potentiometer AD5251 in a 6 V ±1 V Application.
/SD
SW
FB
COMP
SS
RT
GND
IN
PWM
C
C
390pF
C
10nF
R
O
100k
R
SET
0.25k
10k
W
B
A
C8
0.1
μ
F
AD5252
ADP1610
V
OUT
AD8591
V–
U3
U1
U2
U1
+5V
+5V
0
R3
200
R2
1.1k
R1
100
R4
13.5k
C3
10
μ
F
C2
10
μ
F
D1
D1
D2
D3
L1
10
μ
F
CURRENT-SENSING AMPLIFIER
The dual channel, synchronous update, and channel-to-channel
resistance matching characteristics make the AD5251/AD5252
suitable for current sensing applications, such as LED
brightness control. In the circuit shown in Figure 45, when
RDAC1 and RDAC3 are programmed to the same settings, it
can be shown that
(
)
REF
N
o
V
V
V
D
D
V
+
=
1
2
2
(8)
As a result, the current through a sense resistor connected
between V
1
and V
2
can be known. The programmability of this
circuit makes it adaptable to systems that require different sen-
sitivities. If the op amp has very low offset and low bias current,
the major source of error comes from the digital potentiometer
channel-to-channel resistance mismatch, which is typically
0.15%. The circuit accuracy is about 9 bits, which is adequate
for LED control and other general purpose applications.
Figure 46. High Power Adjustable LED Driver
相关PDF资料 |
PDF描述 |
|---|---|
| AD5252 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
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| AD5252BRU1-RL7 | TRANS ARRAY PNP/PNP W/RES S MINI |
| AD5252BRU10 | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5251BRUZ1 | 功能描述:IC POT DGTL DUAL 1K 64P 14TSSOP 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) |
| AD5251BRUZ10 | 功能描述:IC POT DGTL DUAL 10K 64P 14TSSOP 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) |
| AD5251BRUZ100 | 功能描述:IC POT DGTL DL 100K 64P 14TSSOP 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) |
| AD5251BRUZ100-RL7 | 功能描述:IC POT DGTL DL 100K 64P 14TSSOP 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) |
| AD5251BRUZ50 | 功能描述:IC POT DGTL DUAL 50K 64P 14TSSOP 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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