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

14

HMC992LP5E

v03.1013

IF AUTOMATIC GAIN CONTROLLER

(IF-AGC), 50 - 800 MHz

Application Information

Introduction

The HMC992LP5E is a complete high performance Automatic Gain Control (AGC) solution, housing a Variable Gain

Amplifier (VGA) core and a control core in a single package. Its unique VVA technology provides constant OIP3 over

the entire control voltage range. The HMC992LP5E greatly simplifies the design of gain control loops by increasing

the integration level and reducing the number of required circuit elements. The VGA core of the HMC992LP5E is

composed of two identical voltage variable attenuators followed by two gain block amplifiers which operate from 10

to 800 MHz. The HMC992LP5E’s control core features a high accuracy log detector. As shown in the functional block

diagram, the HMC992LP5E combines all of these cores in a highly compact 5 x 5 mm plastic package, and offers an

easy-to-use, temperature stable AGC solution.

The HMC992LP5’s VGA core has a flexible structure where a single attenuator (23dB) or two attenuators (46dB) can

be used depending upon the dynamic range requirement. The HMC992LP5E is designed to operate in a 50 Ohms

impedance system. Inputs and outputs of the HMC992LP5E’s attenuators and amplifiers (ATTIN1, ATTOUT1, ATTIN2,

ATTOUT2, AMPIN1, AMPOUT1, AMPIN2, AMPOUT2) are broadband matched to 50 Ohms single-ended and require

only external DC blocking capacitors over the entire frequency band of operation. The input of the HMC992LP5E’s

built in log detector (RFDETIN) is also broadband matched to 50 Ohms with a single-ended input interface and does

not require any matching components.

The HMC992LP5E requires a single 5V supply with adequate power supply decoupling as recommended in the appli-

cation schematic.

Figure 1a: The HMC992LP5E’s VGA configuration with 1 attenuator.

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