RS 102 V+ REF191 GND AD5280 2 3 6 " />
參數(shù)資料
型號: AD5282BRU50-REEL7
廠商: Analog Devices Inc
文件頁數(shù): 15/28頁
文件大?。?/td> 0K
描述: IC DGTL POT DUAL 256POS 16-TSSOP
標(biāo)準(zhǔn)包裝: 1,000
接片: 256
電阻(歐姆): 50k
電路數(shù): 2
溫度系數(shù): 標(biāo)準(zhǔn)值 30 ppm/°C
存儲器類型: 易失
接口: I²C(設(shè)備位址)
電源電壓: 4.5 V ~ 16.5 V,±4.5 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 帶卷 (TR)
AD5280/AD5282
Rev. C | Page 22 of
28
PROGRAMMABLE CURRENT SOURCE
+5V
RS
102
V+
REF191
GND
AD5280
2
3
6
B
A
W
C1
1F
4
U1
0 TO (2.048 + VL)
VOUT
VIN
5V
RL
100
V–
OP8510
U2
VL
–2.048V TO VL
IL
SLEEP
OP8510
U2
02
92
9-
06
1
Figure 61. Programmable Current Source
A programmable current source can be implemented with the
circuit shown in Figure 61. 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
×
=
(8)
The circuit is simple, but attention must be paid to two things.
First, dual-supply op amps are ideal because the ground
potential of REF191 can swing from 2.048 V at zero scale to VL
at full scale of the potentiometer setting. Although the circuit
works under 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 61 produce an adjustable
current in the range of hundreds of milliamps. 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
AD8532. 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 beyond the
positive rail.
PROGRAMMABLE BIDIRECTIONAL CURRENT
SOURCE
AD5280
+5V
R1
150k
R2A
14.95k
|L
R2B
50k
R2I
15k
C1
10pF
R1I
150k
VL
RL
500k
A2
+15V
A
W
V+
OP2177
V–
V+
V–
A1
–5V
–15V
02
92
9-
0
62
Figure 62. 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 62). If the resistors are matched, the load
current is
(
)
W
B
A
V
R1
R2
L
R2
I
×
+
=
(9)
In theory, R2B can be made as small as needed to achieve the
current needed within the A2 output current driving capability.
In this circuit, the OP2177 can deliver ±5 mA in either direction,
and the voltage compliance approaches 15 V. It can be shown
that the output impedance is
(
)
()
B
A
B
O
R2
R1'
R2'
R1
R2
R1
R2
'
R1
Z
+
×
+
=
(10)
This output impedance can be infinite if Resistor R1' and
Resistor 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 must be in the range
of 1 pF to 10 pF to prevent the oscillation.
相關(guān)PDF資料
PDF描述
DS1100LZ-175+T IC DELAY LINE 5TAP 175NS 8-SOIC
AD5282BRU200-REEL7 IC DGTL POT DUAL 256POS 16-TSSOP
M83723/85R14077 CONN RCPT 7POS JAM NUT W/PINS
VI-B4Y-MX-F4 CONVERTER MOD DC/DC 3.3V 49.5W
MS3450W24-28PZ CONN RCPT 24POS WALL MNT W/PINS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD5282BRUZ20 功能描述:IC DUAL POT 20K 256POS 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 接片:256 電阻(歐姆):100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 35 ppm/°C 存儲器類型:非易失 接口:3 線串口 電源電壓:2.7 V ~ 5.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN-EP(3x3) 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1399 (CN2011-ZH PDF) 其它名稱:MAX5423ETA+TCT
AD5282BRUZ200 功能描述:IC DUAL POT 200K 256POS 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 接片:256 電阻(歐姆):100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 35 ppm/°C 存儲器類型:非易失 接口:3 線串口 電源電壓:2.7 V ~ 5.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN-EP(3x3) 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1399 (CN2011-ZH PDF) 其它名稱:MAX5423ETA+TCT
AD5282BRUZ2002 制造商:AD 制造商全稱:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer
AD5282BRUZ200-R7 功能描述:IC POT DGTL 200K 256POS 16TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)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(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:8-TDFN(2x3) 包裝:帶卷 (TR)
AD5282BRUZ200-R72 制造商:AD 制造商全稱:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer