For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

15

HMC992LP5E

v03.1013

IF AUTOMATIC GAIN CONTROLLER

(IF-AGC), 50 - 800 MHz

Figure 1b: The HMC992LP5E’s VGA configuration with 2 attenuators.

VGA Operation

The HMC992LP5E’s VGA core can be configured with one or two variable attenuators followed by two fixed gain

amplifiers for different control ranges as shown in Figure 1a and Figure 1b (basic connections are not shown). The

blocks require only external DC blocking capacitors at their inputs and outputs for interconnections. Note that the link

between VCTRL and DETOUT pins must be broken for correct VGA Operation. The VCTRL pin should be used to set

the attenuation of the HMC992LP5E.

Gain Control Interface VCTRL

The VCTRL pin is the gain control pin common to both of HMC992LP5E’s identical voltage variable attenuators. The

VCTRL gain control voltage ranges between 1V and 4V. A VCTRL control voltage of 1V provides the lowest attenuation,

while 4V provides the highest attenuation.

Figure 2 represents the VGA operation of HMC992LP5E with two attenuators and two amplifiers for different gain control

voltages applied to the VCTRL pin. The output power increases linearly with the input power until the power saturation is

reached when the VCTRL voltage is constant. The useable input power range of such a system is limited by the satura-

tion level of the final stage amplifier. So the input power level required for power saturation and the dynamic range of the

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. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

For price, delivery, and to place orders: Analog Devices, Inc.,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D