參數(shù)資料
型號: AMP02FS
廠商: Analog Devices Inc
文件頁數(shù): 2/12頁
文件大?。?/td> 0K
描述: IC AMP INST PREC LDRIFT 16SOIC
標(biāo)準(zhǔn)包裝: 47
放大器類型: 儀表
電路數(shù): 1
轉(zhuǎn)換速率: 6 V/µs
-3db帶寬: 1.2MHz
電流 - 輸入偏壓: 4nA
電壓 - 輸入偏移: 40µV
電流 - 電源: 5mA
電流 - 輸出 / 通道: 32mA
電壓 - 電源,單路/雙路(±): ±4.5 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC W
包裝: 管件
REV. E
–10–
AMP02
Overvoltage Protection
Instrumentation amplifiers invariably sit at the front end of
instrumentation systems where there is a high probability of
exposure to overloads. Voltage transients, failure of a transducer,
or removal of the amplifier power supply while the signal source is
connected may destroy or degrade the performance of an unpro-
tected device. A common technique is to place limiting resistors in
series with each input, but this adds noise. The AMP02 includes
internal protection circuitry that limits the input current to
±4 mA
for a 60 V differential overload (see Figure 5) with power off,
±2.5 mA with power on.
DIFFERENTIAL INPUT VOLTAGE
4
–100
LEAKA
GE
CURRENT
mA
3
1
–1
–3
–4
2
0
–2
–80
–60
–40
–20
0
20
40
60
80
100
POWER ON
POWER OFF
TA = 25 C
VS = 15V
Figure 5. AMP02’s Input Protection Circuitry Limits Input
Current During Overvoltage Conditions
Power Supply Considerations
Achieving the rated performance of precision amplifiers in a
practical circuit requires careful attention to external influences.
For example, supply noise and changes in the nominal voltage
directly affect the input offset voltage. A PSR of 80 dB means
that a change of 100 mV on the supply (not an uncommon
value) will produce a 10
V input offset change. Consequently,
care should be taken in choosing a power unit that has a low
output noise level, good line and load regulation, and good
temperature stability. In addition, each power supply should be
properly bypassed.
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