Digitally Controlled Variable Gain Amplifiers

Digitally Controlled Variable Gain Amplifier

A compact GaAs MMIC solution for broadband CATV and FTTH signal paths, combining low noise, high linearity and digitally controlled attenuation in 1 dB steps.

DIGITALLY CONTROLLED VGA

Digitally controlled attenuation for broadband RF paths

AGC1011P integrates a digitally controlled attenuator with broadband gain stages using a 0.5 μm GaAs enhancement-mode pHEMT process. The C1–C5 control inputs provide precise level setting in a compact 4 × 4 mm QFN package.

0.04–1.218

GHz FREQUENCY

37 dB

TYPICAL GAIN

0–30 dB

CONTROL RANGE

1 dB

CONTROL STEP

PRODUCT SPECIFICATIONS

PRODUCT	RF PERFORMANCE			DIGITAL CONTROL		POWER & PACKAGE
Part NumberAmplifier type	FrequencyGHz	Typical GaindB	Noise FiguredB @ 500 MHz	AttenuationRange / dB	Digital ControlStep / Interface	SupplyV / mA typ.	Package
AGC1011PDigitally Controlled VGA	0.04–1.218	37	0.5 typ. 0.69 max.	0–30	1 dB C1–C5 inputs	5 V 180 mA	QFN-24 4 × 4 mm

DIGITAL CONTROL LOGIC

CONTROL INPUTS

C1–C5

ATTENUATION RANGE

0–30 dB

ATTENUATION STEP

1 dB

LOGIC LOW

0–0.5 V

@ 100 μA max.

LOGIC HIGH

3–5 V

@ 100 μA max.

The C1–C5 control inputs select attenuation states from 0 to 30 dB in 1 dB increments.

FEATURES

BROADBAND COVERAGE

40 MHz to 1.218 GHz

Designed for broadband 75 Ω CATV and FTTH signal paths.

DIGITAL STEP CONTROL

1 dB resolution

C1–C5 control inputs set attenuation from 0 to 30 dB.

HIGH LINEARITY

60 dBc CTB / CSO

High-linearity performance for broadband CATV and FTTH signal paths.

LOW NOISE

0.5 dB typical NF

Typical noise figure specified at 500 MHz.

SINGLE-SUPPLY DESIGN

5 V / 180 mA typical

Simplifies power integration in compact receiver equipment.

COMPACT PACKAGE

4 × 4 mm QFN-24

Lead-free and RoHS-compliant surface-mount package.

APPLICATIONS

CATV Networks

Digitally adjustable broadband gain for cable-network receiver and distribution equipment.

FTTH Networks

Repeatable RF level setting in fiber-to-the-home receiver signal paths.

PON / ONU Equipment

Compact digitally controlled gain stages for optical-network-unit RF outputs.