The test conditions and circuit shall be maintained by the manufacturer under document revision level control

and shall be made available to the preparing or acquiring activity upon request. The test circuit shall specify

the inputs, outputs, biases, and power dissipation, as applicable, in accordance with the intent specified in

≥ +125°C.

HTRB is not applicable for this drawing.

The radiation exposure circuit shall be maintained by the manufacturer under document revision level control

and shall be made available to the preparing and acquiring activity upon request. For the AD8367R703F, total

dose irradiation testing to 100Krads (R level) shall be performed in accordance with MIL-STD-883 method

1019, condition A. For the AD8367L703F, total dose irradiation testing to 50Krads (L level with 50% for

75Krads total) shall be performed in accordance with MIL-STD-883 method 1019, condition D.

Final test temperature range is -55°C to 110°C. No testing at +125°C.

The AD8367S is a high performance 45 dB variable gain amplifier with linear-in-dB gain control for use from low

frequencies up to several hundred megahertz. The range, flatness, and accuracy of the gain response are achieved

using Analog Devices’ X-AMP architecture, a powerful proprietary concept for variable gain applications that far

surpasses what can be achieved using competing techniques.

The input is applied to a 9-

stage, 200 Ω resistive ladder network. Each stage has 5 dB of loss, giving a total

attenuation of 45 dB. At maximum gain, the first tap is selected; at progressively lower gains, the tap moves smoothly

and continuously toward higher attenuation values. The attenuator is followed by a 42.5 dB fixed gain feedback

amplifier

– essentially an operational amplifier with a gain bandwidth product of 100 GHz – and is very linear, even at

high frequencies. The output third order intercept is +20 dBV minimum at 70 MHz (+27 dBm, re 200

Ω), measured at

an output level of 1 V p-p with VPS = 5 V.

The analog gain-control input is scaled at 20 mV/dB and runs from 50 mV to 950 mV. This corresponds to a gain of

-2.5 dB to +42.5 dB, respectively, when the gain up mode is selected and +42.5 dB to -2.5 dB, respectively, when the

gain down mode is selected. The gain down, or inverse mode, must be selected when operating in AGC mode in

which an integrated square-law detector with an internal setpoint is used to level the output to 354 mV rms, regardless

of the crest factor of the output signal. A single external capacitor sets up the AGC loop averaging time.

The AD8367S can be powered on or off by a voltage applied to the ENBL pin. When this voltage is logic LO, the total

power dissipation drops into the single digit milliwatt range. For logic HI, the chip powers up rapidly to its normal

quiescent current of 26 mA at 25C.

The AD8367S is a variable gain, single-

ended, IF amplifier based on Analog Devices’ patented X-AMP architecture. It

offers accurate gain control with a 45dB span and a 3 dB bandwidth of 500MHz. It can be configured as a traditional

VGA with 50 dB/V gain scaling or as an AGC amplifier by using the built in rms detector. Figure 3 is a simplified block