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參數(shù)資料
| 型號： | AD515AJ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Monolithic Precision, Low Power FET-Input Electrometer Op Amp |
| 中文描述： | 單片精密低功耗FET輸入運算放大器靜電計 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大小： | 205K |
| 代理商： | AD515AJ |
AD515A
–6–
REV. A
C
P
the total noise by about 40%. Noise currents driving the resistors
also add, but in the AD515A are significant only above 10
11
.
Figure 11. Very High Impedance Instrumentation
Amplifier
Figure 12. Low Drift Integrator and Low Leakage Guarded
Reset
LOW LEVEL CURRENT-TO-VOLTAGE CONVERTERS
Figure 2 shows a standard low level current-to-voltage converter.
To obtain higher sensitivity, it is obvious to simply use a higher
value feedback resistor. However, high value resistors above
10
9
tend to be expensive, large, noisy and unstable. To avoid
this, it may be desirable to use a circuit configuration with
output gain, as in Figure 13. The drawback is that input errors
of offset voltage drift and noise are multiplied by the same gain,
but the precision performance of the AD515A makes the trade-
off easier.
Figure 13. Picoampere to Voltage Converter with Gain
One of the problems with low level leakage current testing or
low level current transducers (such as Clark oxygen sensors) is
finding a way to apply voltage bias to the device while still
grounding the device and the bias source. Figure 14 shows a
technique in which the desired bias is applied at the noninvert-
ing terminal thus forcing that voltage at the inverting terminal.
The current is sensed by R
F
, and the AD524 instrumentation
amplifier converts the floating differential signal to a single-
ended output.
Figure 14. Current-to-Voltage Converters with Grounded
Bias and Sensor
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
TO-99
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD515AJH | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Precision, Low Power FET-Input Electrometer Op Amp |
| AD515AJH/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| AD515AK | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Precision, Low Power FET-Input Electrometer Op Amp |
| AD515AKH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD515AKH/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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