AD845JN

Voltage - Input Offset:	700µV
Base Part Number:	AD845
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C
Voltage - Supply, Single/Dual (±):	±4.75 V ~ 18 V
Current - Output / Channel:	50mA
Current - Supply:	10mA
Series:	--
Current - Input Bias:	750pA
Gain Bandwidth Product:	16MHz
Slew Rate:	100 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	J-FET
Part Status:	Obsolete
Packaging:	Tube

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AD845JN Application Field and Working Principle

The AD845JN instrumentation amplifier is a linear integrated circuit that is used to convert a differential input signal, in a single-ended output signal. It has numerous applications including analog to digital conversion, audio processing, data acquisition, power supplies, and other applications within instrumentation and test and measurement technology.The AD845JN is a four-in-one IC, containing a differential amplifier and three closed loop, gain controlled amplifiers. It has differential input, low input offset voltage, low gain error and wide bandwidth, making it ideal for use in many different applications.The differential inputs of the AD845JN receive two input signals, referred to as +V and -V. This input voltage differential is then measured and compared against a reference voltage, Vref. The output voltage is equal to the difference between this differential input and the reference, multiplied by a gain factor.The AD845JN’s two gain controlled amplifiers provide two-stage gain control. This allows the user to set a desired gain level, and the gain control amplifiers remain matched for the entire frequency range. Furthermore, the AD845JN has an additional closed loop, which can be controlled independently from the gain-controlled amplifiers. This provides a third stage of gain control and helps to reduce noise.The AD845JN also has a wide gain bandwidth product, which is the ratio of the Gain Bandwidth (GBW) to the Gain Error (GE). The high GBW provides a wide frequency range with no loss of gain accuracy. Furthermore, the AD845JN has low DC offset voltage, which helps to reduce any erroneous levels that may be present due to input offset voltage errors.The AD845JN is used in applications such as audio processing, data acquisition, analog to digital conversion, and power supplies. In audio processing applications, the AD845JN is used to convert low-level audio signals into higher level signals suitable for use in amplifiers and speakers. The AD845JN is also used in data acquisition, to measure and monitor various types of signals, such as temperature, pressure, and voltage, without needing to perform any additional amplification.The AD845JN can also be used in analog to digital conversion and power supplies applications. In analog to digital conversion, the AD845JN is used to convert an analog signal into a digital equivalent, which can then be manipulated for further processing. In power supplies, the AD845JN is used to precisely control and manage the power supply output voltage and current.Overall, the AD845JN instrumentation amplifier is a versatile and reliable linear integrated circuit capable of providing accurate and precise data processing and amplification of various signal types. Its wide range of application areas and reliable performance make it an ideal choice for a variety of signal processing applications.

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