AD602JNZ

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The AD602JNZ is a general purpose linear amplifier from Analog Devices’ Instrumentation, OP Amps, Buffer Amps range. It is a low-noise, low-distortion, and moderately high-gain instrumentation amplifier with a gain range of 10-100,000 and a 3-pole low-pass filter having a -3 dB point of 8 kHz. The AD602JNZ is particularly suited to applications where the need for high-precision amplification and low-noise performance is critical.

The AD602JNZ’s design is based on the instrumentation amplifier (IA) topology. IA topology provides precision amplification where the input signals are commonly low-level and unbalanced. This is due to its capability of providing very high CMRR, input common-mode range, high-input impedance, and low-output offset. The usage of advanced power-supply rejection technique, capacitive error-minimization technique, and active output filter allow the AD602JNZ to achieve very high linearity and superior video-performance characteristics without any external filters.

The AD602JNZ’s application field mainly involves precision instrumentation, distributed amplifier systems, low-level preamplifiers, video-image processing applications, and audio systems. In audio systems, the AD602JNZ serves as an analog preamplifier with both voltage and current outputs. In video-image processing applications, it works as a video-camera preamplifier conditioning signals for video-frame grabbers and video displays.

The AD602JNZ IC is somewhat unique, in that the IC contains three op-amps that share a common high-impedance input node. The first op-amp is typically used in an inverting amplifier configuration with a gain-set resistor connected to the non-inverting input. The second op-amp is then used in a non-inverting configuration and acts as a buffer and current-to-voltage converter, while the third op-amp serves as a Unity Gain Buffer (UGB) which has unity or near-unity gain and low output impedance.

The inverting amplifier section of the AD602JNZ has a wide gain range of 10-100,000 and very low noise. It is built around the basic diff-amp amplifier circuit, which uses an accurate null-potentiometer to set the gain and an outboard RC low-pass filter to reduce noise. This section provides outstanding performance in terms of low-noise, low-distortion, and wide gain-range. The gain ranges to more than 100,000 are achievable using the external gain-setting network.

The Buffer amplifier section of the AD602JNZ is a current-to-voltage converter, providing a very high input impedance and low distortion output. It can be used to drive capacitive, resistive, and inductive loads with a wide voltage range. The buffer offers independent volume control, power supply flexibility, and superior common mode noise rejection ratio. The integrated output stage includes a high-speed driver and a 3-pole low-pass filter, providing seamless video bandwidth and distortion-free signal reproduction.

The Unity Gain Buffer (UGB) is designed to handle the high-frequency signals and to provide excellent signal separation and dynamic range. The UGB section of the AD602JNZ IC offers low output noise, low distortion and a wide frequency response which enables dynamic signal separation and signal transmission over a wide frequency range.

The AD602JNZ is a very versatile linear amplifier, offering excellent performance, flexible signal handling, and high dynamic range. Its wide gain range, low noise performance, extremely wide input common mode range, and high sheer drive capability, make it a perfect choice for instrumentation, distributed amplifier systems, low-level preamplifiers, video-image processing applications, and audio systems.

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