- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16587 > EVAL-AD5282EBZ (Analog Devices Inc)BOARD EVALUATION FOR AD5282 PDF資料下載
參數(shù)資料
| 型號(hào)： | EVAL-AD5282EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD5282 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 數(shù)字電位器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD5282 |
| 主要屬性： | 2 通道，256 位置 |
| 次要屬性： | I²C 接口 |
| 已供物品： | 板 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁當(dāng)前第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
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
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 |
|---|---|
| ECO-S2WB101BA | CAP ALUM 100UF 450V 20% SNAP |
| EVAL-AD5262EBZ | BOARD EVAL FOR AD5262 |
| MC13783JVK5 | IC PWR MGT AUD CIRCUIT 247MAPBGA |
| V300B36E150BG3 | CONVERTER MOD DC/DC 36V 150W |
| EVAL-AD5100EBZ | BOARD EVAL FOR AD5100 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD5290EBZ | 功能描述:BOARD EVAL FOR AD5290 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-AD5292EBZ | 功能描述:BOARD EVAL FOR AD5292 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-AD5360EBZ | 功能描述:BOARD EVAL FOR AD5360 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 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:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| EVAL-AD5360EBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Channel, 16-/14-Bit, Serial Input, Voltage-Output DAC |
| EVAL-AD5361EBZ | 功能描述:BOARD EVAL FOR AD5361 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 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:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。