surpasses what can be achieved using competing techniques.
鈩?/div>
resistive ladder network, having
nine sections each of 5 dB loss, for 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鈥攅ssentially an operational ampli-
fier with a gain bandwidth product of 100 GHz鈥攁nd is very
linear, even at high frequencies. The output third order intercept is
+20 dBV at 100 MHz (+27 dBm re 200
鈩?,
measured at an
output level of 1 V p-p with V
S
= 5 V.
The analog gain-control interface is very simple to use. It is
scaled at 20 mV/dB, and the control voltage, V
GAIN
, runs from
50 mV at 鈥?.5 dB to 950 mV at +42.5 dB. In the inverse-gain
mode of operation, selected by a simple pin-strap, the gain
decreases from +42.5 dB at V
GAIN
= 50 mV to 鈥?.5 dB at
V
GAIN
= 950 mV. This inverse mode is needed in AGC applications,
which are supported by the integrated square-law detector,
whose set point is chosen to level the output to 354 mV rms,
regardless of the waveshape. A single external capacitor sets up
the loop averaging time.
The AD8367 may be powered on or off by a voltage applied to
the ENBL pin. When this voltage is at a logic LO, the total power
dissipation drops to the milliwatt range. For a logic HI, the chip
powers-up rapidly to its normal quiescent current of 26 mA at
25掳C. The AD8367 is available in a 14-lead TSSOP package for
the industrial temperature range of 鈥?0掳C to +85掳C.
X-AMP is a registered trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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漏 Analog Devices, Inc., 2001