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參數(shù)資料
| 型號(hào)： | EVAL-AD7877EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Touch Screen Controller |
| 中文描述： | 觸摸屏控制器 |
| 文件頁(yè)數(shù)： | 27/44頁(yè) |
| 文件大?。?/td> | 1002K |
| 代理商： | EVAL-AD7877EB |
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AD7877
V
OUT
falls. If the DAC output exceeds V
REF
, it starts to source
current, and V
OUT
has to further decrease to compensate. When
the DAC output is at full scale, V
OUT
is at its minimum.
Rev. A | Page 27 of 44
Note that the effect of the DAC on V
OUT
is opposite in voltage
mode to that in current mode. In current mode, increasing DAC
code increases the sink current, so V
OUT
increases with
increasing DAC code. In voltage mode, increasing DAC code
increases the DAC output voltage, reducing the sink current.
Calculate the resistor values as follows:
1.
Decide on the feedback current as before.
2.
Calculate the parallel combination of R1 and R3 when the
DAC output is zero:
R
P
=
V
REF
/
I
FB
3.
Calculate R2 as before, but use R
P
and V
OUTMAX
:
R2
=
R
P
(
V
OUT(MAX)
V
REF
)/
V
REF
4.
Calculate the change in feedback current between
minimum and maximum output voltages as before using
I
=
V
R2(MAX)
/
R2
V
R2(MIN)
/
R2
This is equal to the change in current through R1 between
zero output and full scale, which is also given by
I
=
current at zero
current at full scale
=
V
/
R1
(
V
REF
V
)/
R1
=
V
/
R1
5.
R1
=
V
FS
/
.
6.
Calculate R3 from R1 and R using
R3
= (
R1
×
R
P
)/(
R1
R
P
)
Example:
1.
V
CC
= 5 V and
V
FS
=
V
CC
.
V
OUT(MIN)
is 20 V and
V
OUT(MAX)
is
25 V.
V
REF
is 1.25 V. Allow 100 μA around the feedback
loop.
2.
R
P
= 1.25 V/100 μA = 12.5 k.
3.
R2
= 12.5 k × (25 1.25 )/1.25 = 237 k.
Use nearest preferred value of 240 k.
4.
I
= 25 V/240 k 20 V/240 k = 21 μA.
5.
R1
= 5 V/21 μA = 238 k.
Use nearest preferred value of 250 k.
6.
R3
= (180 k × 12.5 k)/(180 k 12.5 k) =13.4 k.
Use nearest preferred value of 13 k.
The actual adjustment range using these values is 21 V to 26 V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7877EBZ | 功能描述:BOARD EVALUATION FOR AD7877 RoHS:是 類(lèi)別:編程器，開(kāi)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(chēng):82EBV2081 |
| EVAL-AD7879-1EBZ | 功能描述:BOARD EVALUATION FOR AD7879-1 RoHS:是 類(lèi)別:編程器，開(kāi)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(chēng):82EBV2081 |
| EVAL-AD7879EBZ | 功能描述:BOARD EVALUATION FOR AD7879 RoHS:是 類(lèi)別:編程器，開(kāi)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(chēng):82EBV2081 |
| EVAL-AD7887CB | 制造商:Analog Devices 功能描述:EVAL BD FOR 2.7 V TO 5.25 V, MICROPWR, 2CH, 125 KSPS, 12-BIT - Bulk |
| EVAL-AD7887CB4 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP |
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