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| 型號： | AMP04FPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST PREC 30MA LP 8DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 700kHz |
| 電流 - 輸入偏壓： | 22nA |
| 電壓 - 輸入偏移： | 30µV |
| 電流 - 電源： | 750µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 30 V，±2.5 V ~ 15 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 771 (CN2011-ZH PDF) |
AMP04
REV. B
–9–
10
90
100
0%
1mV
2s
Figure 7c. 10 Hz Low-Pass Filtered Output
Power Supply Considerations
In dual supply applications (for example
±15 V) if the input is
connected to a low resistance source less than 100
, a large
current may flow in the input leads if the positive supply is
applied before the negative supply during power-up. A similar
condition may also result upon a loss of the negative supply. If
these conditions could be present in you system, it is recom-
mended that a series resistor up to 1 k
be added to the input
leads to limit the input current.
This condition can not occur in a single supply environment
as losing the negative supply effectively removes any current
return path.
Offset Nulling in Dual Supply
Offset may be nulled by feeding a correcting voltage at the VREF
pin (Pin 5). However, it is important that the pin be driven with
a low impedance source. Any measurable resistance will degrade
the amplifier’s common-mode rejection performance as well as
its gain accuracy. An op amp may be used to buffer the offset
null circuit as in Figure 8.
8
7
6
5
1
2
3
4
AMP04
REF
V+
V–
5V
–
+
INPUT
+5V
–5V
50k
100
50k
5mV
ADJ
RANGE
*
*OP90 FOR LOW POWER
OP113 FOR LOW DRIFT
–5V
OUTPUT
RG
+5V
–5V
Figure 8. Offset Adjust for Dual Supply Applications
Offset Nulling in Single Supply
Nulling the offset in single supply systems is difficult because
the adjustment is made to try to attain zero volts. At zero volts
out, the output is in saturation (to the negative rail) and the
output voltage is indistinguishable from the normal offset error.
Consequently the offset nulling circuit in Figure 9 must be used
with caution.
First, the potentiometer should be adjusted to cause the output
to swing in the positive direction; then adjust it in the reverse
direction, causing the output to swing toward ground, until
the output just stops changing. At that point the output is at
the saturation limit.
8
7
6
5
1
2
3
4
AMP04
5V
INPUT
100
OUTPUT
RG
OP113
50k
5V
Figure 9. Offset Adjust for Single Supply Applications
Alternative Nulling Method
An alternative null correction technique is to inject an offset
current into the summing node of the output amplifier as in
Figure 10. This method does not require an external op amp.
However, the drawback is that the amplifier will move off its
null as the input common-mode voltage changes. It is a less
desirable nulling circuit than the previous method.
IN(–)
IN(+)
INPUT BUFFERS
REF
100k
11k
RGAIN
VOUT
100k
V–
V+
Figure 10. Current Injection Offsetting Is Not
Recommended
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