AD818ARZ-REEL

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Applications:	Voltage Feedback
Output Type:	--
Number of Circuits:	1
-3db Bandwidth:	130MHz
Slew Rate:	500 V/µs
Current - Supply:	7mA
Current - Output / Channel:	50mA
Voltage - Supply, Single/Dual (±):	5 V ~ 36 V, ±2.5 V ~ 18 V
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	AD818

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AD818ARZ-REEL: Video Amp and Module Application and Working Principle

The AD818ARZ-REEL is an ultra-low distortion, high-performance video amplifier module that is commonly used in many video and image processing applications. It is a low noise, fast-slewing, wideband amplifier that can be used as a line driver in high-speed and low-noise applications. In addition, it is also suitable for spectral analysis, analog-to-digital and digital-to-analog conversion, and various other video applications.The AD818ARZ-REEL is available in a 14-pin, 4.0 x 4.0 mm package and is suitable for operations in the range of -40°C to +85°C. Moreover, it also has a maximum differential gain of 0.012% with a maximum differential phase of 0.020° and an open-loop gain of 110 dB. The main features of the AD818ARZ-REEL include a low-noise transimpedance amplifier stage, wideband SiGe transistor output stages and differential inputs and outputs, a wide supply voltage range of +2.8 V to +5.5 V, and a low distortion power supply and bias network. The input range of the module is up to 4.0 Vp-p with a maximum operation voltage of +1.8 Vp-p. The common mode input range of the module is unlimited and the maximum output swing is 3.2 Vp-p. The open-loop bandwidth of the module is up to 300 MHz, with a gain of up to 110 dB, while the linearity is up to 0.012% maximum differential gain and 0.020° maximum differential phase.In terms of power consumption, the AD818ARZ-REEL requires a 4-pin power supply of +2.6 V to +5.5 V and a current consumption of 20 mA at +5.5 V. The video input and output is typically DC coupled on the input and AC coupled on the output for most applications.

Working Principle

The AD818ARZ-REEL module operates with three distinct stages. The input stage is a low-noise transimpedance amplifier that converts the video signal from an AC signal to a DC signal. It is followed by a differential amplifier stage, which further amplifies the input signal. The output stage is then a wideband SiGe transistor differential pair, which drives the output. The differential pair in the output stage is composed of two matched transistors, where one of the transistors is connected to the positive terminal of the 0.6 V power supply and the other is connected to the negative terminal of the power supply. The output signal swing is regulated by the control loop that is connected between the positive and negative power supply terminals. The differential pair is biased at the optimum current density (100 μA/μm) to ensure that the maximum output swing is achieved while reducing the power dissipation. The output swing is controlled by the bias current and supplied to the output stage by the current source in the power supply. The power supply helps to maintain the bias current when the output signal is in its extreme amplitude or is too far from the reference voltage.

Conclusion

The AD818ARZ-REEL video amplifier module is designed for low-noise and fast-slewing applications that require wideband amplification. It is available in a compact 14-pin, 4.0 x 4.0 mm package, and has a maximum differential gain of 0.012% with a maximum differential phase of 0.020° and an open-loop gain of 110 dB. The module operates using three distinct stages: a low-noise transimpedance amplifier, a differential amplifier, and a wideband SiGe transistor differential pair output stage. It is suitable for operations in the range of -40°C to +85°C with a maximum operation voltage of +1.8 Vp-p and a power supply of +2.8 V to +5.5 V.

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