Can be used in applications where both numerator and denominator are restricted to single polarity (to one quadrant),Input variables X, Y and Z are applied to three indeρendent transd log amplifiers(A1- Q1A, A2- Q2A, and A3- Q2B ). Outputs of logamps are proportional to logarithms of input variables. R4, in feedback circuit of A4 converts collector current of Q1B to output voltage proportional to VZ VY / VX. Circuit performs multiplication and division simultaneously and with equal accuracy. Overall nonlinearity can be as low as 0.05%. Article gives design equations.-L.Counts and D. Sheingold, Analog Divider:What Choice Do You Have?, EDN Magazine, May 5, 1974, p 55-61.
The AD818 is a low cost, video op amp optimized for use in video applications which require gains equal to or greater than+2 or (R)C1. The AD818 low differential gain and phase errors single supply functionality, low power and high output drive make it ideal for cable driving applications such as video cam-eras and professional video equipment.
With video specs like 0.1 dB flatness to 55 MHz and low differ-ential gain and phase errors of 0.01% and 0.05, along with 50 mA of output current, the AD818 is an excellent choice for any video application. The 130 MHz 3 dB bandwidth (G = +2)and 500 V/s slew rate make the AD818 useful in many high speed applications including: video monitors, CATV, color copiers, image scanners and fax machines.
The AD818 is fully specified for operation with a single +5 V power supply and with dual supplies from ±5 V to ±15 V. This power supply flexibility, coupled with a very low supply current of 7.5 mA and excellent ac characteristics under all power supply conditions, make the AD818 the ideal choice for many demanding yet power sensitive applications.
The AD818 is a voltage feedback op amp and excels as a gain stage in high speed and video systems (gain = >2 or -1). I achieves a settling time of 45 ns to 0.1%, with a low input offset voltage of 2 mV max.
The AD818 is available in low cost, small 8-lead plastic mini-DIP and SOIC packages.
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Low CostExcellent Video Performance 55 MHz 0.1 dB Bandwidth (Gain = +2) 0.01% & 0.05. Differential Gain & Phase ErrorsHigh Speed 130 MHz Bandwidth (3 dB, G = +2) 100 MHz Bandwidth (3 dB, G+ = 1) 500 V/s Slew Rate 80 ns Settling Time to 0.01% (VO = 10 V Step)High Output Drive Capability 50 mA Minimum Output Current Ideal for Driving Back Terminated CablesFlexible Power Supply Specified for Single (+5 V) and Dual (±5 V to ±15 V) Power Supplies Low Power: 7.5 mA max Supply CurrentAvailable in 8-Lead SOIC and 8-Lead Plastic Mini-DIP
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Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Internal Power Dissipation2
Plastic (N) . . . . . . . . . . . . . . . . . . . . . .See Derating Curves
Small Outline (R) . . . . . . . . . . . . . . . . .See Derating Curves
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . .±Vs
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .±6 V
Output Short Circuit Duration . . . . . . . ..See Derating Curves
Storage Temperature Range (N, R) . . . . . . ...-65 to +125
Operating Temperature Range . . . . . . . . . .... .-40 to +85
Lead Temperature Range (Soldering 10 seconds) . . .+300
Post a Buying Lead
Required Field 
