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參數(shù)資料
| 型號： | AD5171BRJ50-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 64-Position OTP Digital Potentiometer |
| 中文描述： | 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO8 |
| 封裝： | MO-178-BA, SOT-23, 8 PIN |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 1722K |
| 代理商： | AD5171BRJ50-R2 |
AD5171
APPLICATIONS
PROGRAMMABLE VOLTAGE REFERENCE (DAC)
It is common to buffer the output of the digital potentiometer
as a DAC unless the load is much larger than R
WB
. The buffer
serves the purpose of impedance conversion as well as
delivering higher current, which may be needed.
GND
2
V
IN
V
OUT
1
U1
5V
3
V
0
AD8601
5V
A
W
B
AD1582
ADR03
A1
AD5171
U2
0
Figure 40. Programmable Voltage Reference (DAC)
GAIN CONTROL COMPENSATION
The digital potentiometers are commonly used in gain controls
(Figure 41) or sensor transimpedance amplifier signal
conditioning applications. To avoid gain peaking or in worst-
case oscillation due to step response, a compensation capacitor
is needed. In general, C2 in the range of a few picofarads to no
more than a few tenths of a picofarad is adequate for the
compensation.
U1
C2
4.7pF
A
B
W
R2 100k
V
O
V
I
R1
47k
0
Figure 41. Typical Noninverting Gain Amplifier
PROGRAMMABLE VOLTAGE SOURCE WITH
BOOSTED OUTPUT
For applications that require high current adjustment, such as a
laser diode driver or tunable laser, a boosted voltage source can
be considered (Figure 42).
+V
W
SIGNAL
C
C
R
BIAS
LD
V
IN
A
B
V
OUT
U1
AD5171
U3 2N7002
AD8601
U2
–V
I
L
0
Figure 42. Programmable Booster Voltage Source
In this circuit, the inverting input of the op amp forces the V
OUT
to be equal to the wiper voltage set by the digital potentiometer.
The load current is then delivered by the supply via the N-Ch
FET N
1
. N
1
power handling must be adequate to dissipate
(V
I
V
O
) × I
L
power. This circuit can source a maximum of
100 mA with a 5 V supply. For precision applications, a voltage
reference such as ADR421, ADR03, or ADR370 can be applied
at the A terminal of the digital potentiometer.
LEVEL SHIFTING FOR DIFFERENT VOLTAGE
OPERATION
When users need to interface a 2.5 V controller with AD5171, a
proper voltage level shift must be employed so that the digital
potentiometer can be read from or written to the controller;
Figure 43 shows one of the implementations. M1 and M2
should be low threshold N-Ch power MOSFETs, such as
FDV301N.
2.5V
CONTROLLER
2.7V–5.5V
AD5171
Rp
Rp
Rp
Rp
V
DD1
= 2.5V
V
DD2
= 5V
G
G
S
D
M1
S
D
M2
SDA1
SCL1
SDA2
SCL2
0
Figure 43. Level Shifting for Different Voltage Operation
RESISTANCE SCALING
The AD5171 offers 5 k
, 10 k
, 50 k
, and 100 k
nominal
resistances. For users who need to optimize the resolution with
an arbitrary full-range resistance, the following techniques can
be used. By paralleling a discrete resistor (Figure 44) a
proportion tely lower voltage appears at terminal A to B, which
is applicable to only the voltage divider mode.
This translates into a finer degree of precision because the step
size at terminal W will be smaller. The voltage can be found as
DD
AB
AB
R
+
W
V
D
64
R
R
R
R
D
V
×
×
=
2
||
3
)
||
(
)
(
(5)
R1
R2
B
A
V
DD
R3
W
0
Figure 44. Lowering the Nominal Resistance
Rev. PrC | Page 17 of 20
Preliminary Technical Data
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5171BRJ50-RL7 | 制造商:Rochester Electronics LLC 功能描述:6-BIT OTP I2C DIGITAL POT - Bulk 制造商:Analog Devices 功能描述: |
| AD5171BRJ5-R2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD5171BRJ5-REEL7 | 制造商:Analog Devices 功能描述: |
| AD5171BRJ5-RL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD5171BRJZ100-R2 | 功能描述:IC DGTL POT OTP 100K I2C SOT23-8 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
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