Brief Description
The FX019 Digitally Adjustable Amplifier Array is available to replace trimmer potentiometers and volume controls in Cellular, PMR, Telephony and Communications applications where d.c., voice or data signals need adjustment.
The FX019 is a single-chip LSI consisting of four digitally controlled amplifier stages, each with 15 distinct gain/attenuation steps. Control of each individual amplifier is by an 8-bit serial data stream. Three of the amplifier stages offer a +/-3dB range in steps of 0.43dB, whilst the remaining amplifier offers a +/-14dB range in steps of 2dB, and is suggested for volume control applications. Each amplifier includes a 16th Off state which when applied, mutes the output audio from that channel. This array uses a Chip Select input to select one of two FX019s in a system.
This product replaces the need for manual trimming of audible signals by using the host microprocessor to digitally control the set-up of all audio levels during development, production/calibration and operation.

FEATUREs
● 4 Digitally Controlled Amplifiers
● 15 Gain/Attenuation Steps
● 3 Amplifiers, with a ± 3dB Range in 0.43dB Steps
● 1 Volume Amplifier, with a ± 14dB Range in 2dB Steps
● 8-Bit Serial Data Control
● Output Mute Function
● Audio and Data Gain Control Applications
● Telecoms, Radio and Industrial Applications

APPLICATIONs include:
(i) Control, adjustment and set-up of communications
   equipment by an Intelligent ATE without manual
   intervention – eg. Deviation, Microphone and L/S
   Levels, Rx Audio Level etc.
(ii) Automatic Dynamic Compensation of drift caused
   by variations in temperature, linearity, etc.
(iii)Fully automated servicing and re-alignment.
   The FX019 is a low-power, single 5-volt CMOS
   device available in plastic DIL and Small Outline
   (S.O.I.C.) SMD package versions.