12 - 6

For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, 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

12

HMC680LP4 / 680LP4E

v03.0609

BiCMOS MMIC 5-BIT DIGITAL

VARIABLE GAIN AMPLIFIER, 30 - 400 MHz

Pin Descriptions

pin number

function

description

interface schematic

1

ibias

bias current to amplifier. external inductors

required.

2, 5, 6,

package bottom

n/C, gnd

these pins and package bottom must

be connected to rf/dC ground.

3

iset

external bias resistor to adjust the current of the

amplifier.

4, 18

Vdd

power supply

9, 10, 11,

12, 13

b4 - b0

Control inputs to digital attenuator.

see truth table & Control Voltage table.

7, 8

rfOUtp,

rfOUtn

balanced amplifier outputs.

external components required

20, 24

ampinn,

ampinp

balanced amplifier inputs.

external components required.

21, 23

fb2,

fb1

feedback capacitance for the amplifier.

22

le

Common mode emitter inductor.

the le pin requires high quality (less than

200mOhms resistance) inductor to ground.

an inductance of 100nH is recommended.

14

rfin

rf input to digital attenuator.

dC blocking capacitor required.

15, 16, 17

fC3 - fC1

external capacitors to ground are required.

place these capacitors close to the package.

19

attnOUt

rf output to digital attenuator.

dC blocking capacitor required.

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