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RF3322PCBA

CABLE REVERSE PATH PROGRAMMABLE GAIN AMPLIFIER

RF Micro Devices 

Preliminary

3

RF3322

CABLE REVERSE PATH

PROGRAMMABLE GAIN AMPLIFIER

Typical Applications

• Euro-DOCSIS/DOCSIS Cable Modems

• CATV Set-Top Boxes

• Telephony Over Cable

• Home Networks

• Automotive/Mobile Multimedia

• Coaxial and Twisted Pair Line Driver

3

Product Description

The RF3322 is a variable gain amplifier for use in CATV

reverse path (upstream) applications. It is DOCSIS-com-

pliant for use in cable modems. The gain control covers a

58dB range and is serially programmable via three-wire

digital bus for compatibility with standard baseband

chipsets. Amplifier shutdown and transmit disable modes

are software- and hardware-controlled. The device is

placed into sleep mode via the serial control bus. The

device operates over the frequency band of 5MHz to

65MHz for use in current U.S. and European systems.

The amplifier delivers up to 60dBmV at the output of the

balun. Gain is controllable in accurate 1dB steps. The

device is provided in an industry-standard QSOP-20

package.

Optimum Technology Matching® Applied

Si BJT

üSi Bi-CMOS

GaAs HBT

SiGe HBT

GaAs MESFET

Si CMOS

GND 1

VCC1 2

GND 3

GND1 4

VIN+ 5

VIN- 6

GND 7

CS 8

SDA 9

SCLK 10

Power

Control

Gain Control

and Serial Bus

20 GND2

19 VCC2

18 TXEN

17 NC

16 VOUT+

15 VOUT-

14 RAMP

13 NC

12 SHDN

11 GND

0.157

0.150

0.0098

0.0040

0.340

0.333

0.0098

0.0040

0.025

0.244

0.228

0.0688

0.0532

Dimensions in inches.

8° MAX

0° MIN

0.050

0.016

0.010

0.006

NOTES:

1. Shaded lead is Pin 1.

2. All dimensions are excluding mold flash and protrusions.

3. Lead coplanarity: 0 to 0.004 max.

4. Deviation from package center and leadframe center: 0.004 max.

5. Misalignment from top and bottom package centers: 0.004 max.

6. End flash not to exceed 0.006 per side.

Package Style: QSOP-20

Features

• Single 5V Supply

• Differential Input and Output

• -30dB to +28dB Voltage Gain Range

• 5MHz to 65MHz Operation

• Sophisticated Power Management

• DOCSIS 1.1 RF Compliant

Ordering Information

RF3322

Cable Reverse Path Programmable Gain Amplifier

RF3322 PCBA Fully Assembled Evaluation Board

Functional Block Diagram

RF Micro Devices, Inc.

7625 Thorndike Road

Greensboro, NC 27409, USA

Tel (336) 664 1233

Fax (336) 664 0454

http://www.rfmd.com

Rev A2 010518

3-27

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