Datasheet > AD8236ARMZ-RL1

AD8236ARMZ-RL1

更新时间： 2022-05-24 12:28:28

品牌	Logo	应用领域
亚德诺 - ADI		仪表放大器
页数	文件大小	规格书
20页	514K
描述
40 Î¼A Micropower Instrumentation Amplifier with Zero Crossover Distortion

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数据手册

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AD8236ARMZ-RL1 数据手册

AD8236

REF

–V

TRANSFORMER

f_HIGH-PASS

AD8236

2πRC

AD8236

REF

–V

AC-COUPLED

Figure 38. Creating an I_BIASPath

RF INTERFERENCE

INPUT BIAS CURRENT RETURN PATH

RF rectification is often a problem in applications where there are

large RF signals. The problem appears as a small dc offset voltage.

The AD8236, by its nature, has a 3.1 pF gate capacitance, C_G, at

each input. Matched series resistors form a natural low-pass filter

that reduces rectification at high frequency (see Figure 39). The

relationship between external, matched series resistors and the

internal gate capacitance is expressed as

The AD8236 input bias current is extremely small at less than

10 pA. Nonetheless, the input bias current must have a return

path to common. When the source, such as a transformer,

cannot provide a return current path, one should be created

(see Figure 38).

INPUT PROTECTION

All terminals of the AD8236 are protected against ESD. In

addition, the input structure allows for dc overload conditions

a diode drop above the positive supply and a diode drop below

the negative supply. Voltages beyond a diode drop of the supplies

cause the ESD diodes to conduct and enable current to flow

through the diode. Therefore, an external resistor should be

used in series with each of the inputs to limit current for

voltages above +V_S. In either scenario, the AD8236 safely

handles a continuous 6 mA current at room temperature.

FilterFreq_DIFF

2πRC_G

FilterFreq_CM

2πRC_G

0.1µF

+IN

10µF

For applications where the AD8236 encounters extreme

overload voltages, as in cardiac defibrillators, external series

resistors and low leakage diode clamps, such as BAV199Ls,

FJH1100s, or SP720s, should be used.

OUT

AD8236

–V

REF

–V

–IN

0.1µF

10µF

–V

Figure 39. RFI Filtering Without External Capacitors

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