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參數(shù)資料
| 型號： | AD628ARMZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Common-Mode Voltage, Programmable Gain Difference Amplifier |
| 中文描述： | OP-AMP, 1500 uV OFFSET-MAX, PDSO8 |
| 封裝： | ROHS COMPLIANT, MO-187AA, MSOP-8 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 298K |
| 代理商： | AD628ARMZ-RL |
AD628
APPLICATIONS
GAIN ADJUSTMENT
The AD628 system gain is provided by an architecture
consisting of two amplifiers. The gain of the input stage
is fixed at 0.1; the output buffer is user-adjustable as
G
A2
= 1 +
R
EXT1
/
R
EXT2
. The system gain is then
Rev. F | Page 15 of 20
+
×
=
EXT2
EXT1
TOTAL
G
R
R
1
0.1
(1)
At a 2 nA maximum, the input bias current of the buffer amplifier
is very low and any offset voltage induced at the buffer amplifier
by its bias current may be neglected (2 nA × 10 kΩ = 20 μV).
However, to absolutely minimize bias current effects, select R
EXT1
and R
EXT2
so that their parallel combination is 10 kΩ. If practical
resistor values force the parallel combination of R
EXT1
and R
EXT2
below 10 kΩ, add a series resistor (R
EXT3
) to make up for the
difference. Table 5 lists several values of gain and corresponding
resistor values.
Table 5. Nearest Standard 1% Resistor Values for
Various Gains
1
Total Gain
(V/V)
(V/V)
0.1
1
0.2
2
0.25
2.5
0.5
5
1
10
2
20
5
50
10
100
A2 Gain
R
EXT1
(Ω)
10 k
20 k
25.9 k
49.9 k
100 k
200 k
499 k
1 M
R
EXT2
(Ω)
∞
20 k
18.7 k
12.4 k
11 k
10.5 k
10.2 k
10.2 k
R
EXT3
(Ω)
0
0
0
0
0
0
0
0
1
See
Figure 29
.
To set the system gain to less than 0.1, create an attenuator by
placing Resistor R
EXT4
from Pin 4 (C
FILT
) to the reference voltage.
A divider is formed by the 10 kΩ resistor that is in series with
the positive input of A2 and Resistor R
EXT4
. A2 is configured for
unity gain.
Using a divider and setting A2 to unity gain yields
1
×
+
×
=
EXT4
EXT4
DIVIDER
W
R
R
G
kΩ
10
0.1
/
INPUT VOLTAGE RANGE
VREF and the supply voltage determine the common-mode
input voltage range. The relation is expressed by
≤
+
)
V
.
–
(
REF
S
CM
V
V
V
UPPER
10
2
1
11
(2)
REF
S
CM
V
V
(
10
2
1
11
+
≥
)
V
.
V
LOWER
where V
S+
is the positive supply, V
S
is the negative supply,
and 1.2 V is the headroom needed for suitable performance.
Equation 2 provides a general formula for calculating the
common-mode input voltage range. However, keep the AD628
within the maximum limits listed in Table 1 to maintain
optimal performance. This is illustrated in Figure 30 where the
maximum common-mode input voltage is limited to ±120 V.
Figure 31 shows the common-mode input voltage bounds for
single-supply voltages.
–200
–150
–100
–50
0
50
I
100
150
200
8
6
2
4
0
10
12
1
SUPPLY VOLTAGE (±V)
0
4
16
MAXIMUM INPUT COMMON-MODE
VOLTAGE WHEN V
REF
= GND
Figure 30. Input Common-Mode Voltage vs. Supply Voltage
for Dual Supplies
–80
–60
–40
–20
0
20
40
60
80
100
I
8
6
2
4
0
10
12
1
SINGLE-SUPPLY VOLTAGE (V)
0
4
16
MAXIMUM INPUT COMMON-MODE
VOLTAGE WHEN V
REF
= MIDSUPPLY
Figure 31. Input Common-Mode Voltage vs.
Supply Voltage for Single Supplies
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD628ARN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Amplifier. Other |
| AD628AR-REEL | 功能描述:IC AMP PGA DIFF PREC 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:2pA 電壓 - 輸入偏移:1000µV 電流 - 電源:85µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOICN 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:680 (CN2011-ZH PDF) 其它名稱:MCP6L04T-E/SLCT |
| AD628AR-REEL7 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual ±18V/36V 8-Pin SOIC N T/R |
| AD628ARZ | 功能描述:IC AMP PGA DIFF PREC 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:MicroAmplifier™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:5pA 電壓 - 輸入偏移:1500µV 電流 - 電源:220µA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 36 V，±2.25 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:剪切帶 (CT) 其它名稱:296-29363-1 |
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