fx009a Consumer Microcircuits Limited, fx009a Datasheet

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fx009a

Manufacturer Part Number
fx009a
Description
Low-noise Digitally Controlled Amplifier Array
Manufacturer
Consumer Microcircuits Limited
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
fx009aLG
Manufacturer:
CML
Quantity:
20 000
Features/Applications
Brief Description
The FX009A Digitally Adjustable Amplifier Array is
intended to replace trimmer potentiometers and volume
controls in Cellular, PMR, Telephony and
Communications applications where d.c., voice or data
signals need adjustment.
The FX009A is a low-noise single-chip LSI consisting
eight digitally controlled amplifier stages, each with 15
distinct gain/attenuation steps. Control of each
individual amplifier is by an 8-bit serial data stream.
Seven 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 intended for
volume control applications. Each amplifier includes a
16th 'Mute' state which sets the output to bias (V
and powersaves the entire section. Minimum current
drain may be achieved by muting all eight sections.
Fig.1 Functional Block Diagram
8 Digitally Controlled Low-Noise
Amplifiers
15 Gain/Attenuation Steps
7 Trimmers, with a
0.43dB Steps
1 'Volume' Trimmer, with a
Range in 2.0dB Steps
SERIAL CLOCK INPUT
SERIAL DATA INPUT
V
V
Ch1
Ch2
Ch3
Ch4
DD
BIAS
1
2
3
4
16
V
V
V
V
1
BIAS
BIAS
BIAS
BIAS
16-LINE STEP CONTROLS TO AMPLIFIERS 1 to 8
*
*
*
*
OUTPUT MUTE - POWERSAVE
CONTROLLED AUDIO OUTPUT LINES
2
CML Semiconductor Products
PRODUCT INFORMATION
FX009A
3dB Range in
4
SERIAL DATA INPUT
LINE DECODERS
3
3
2
8 - BIT
4
AND
1
5
14dB
5
DD
6
/2)
6
7
8 - VOLUME
7
Low-Noise Digitally Controlled
Amplifier Array
*
*
*
*
1
V
V
V
V
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.
Applications include:
(i) Control, adjustment and set-up of communications
equipment by an Intelligent ATE without manual
intervention – eg. Deviation, Microphone and L/S
Level, 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 FX009A is a low-power, single 5-volt CMOS
device available in both 24-pin DIL and SMD package
versions.
BIAS
BIAS
8
BIAS
BIAS
8-Bit Serial Data Control
Output Mute/Powersave Function
Audio and Data Gain Control
Applications
Cellular, PMR, PABX Applications
5
6
8
7
LOAD/LATCH
LOAD/LATCH
Publication D/009A/3 July 1994
Ch5
Ch6
Ch7
Ch8
V
SS
FX009A

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fx009a Summary of contents

Page 1

... Intelligent ATE without manual intervention – eg. Deviation, Microphone and L/S Level, 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 FX009A is a low-power, single 5-volt CMOS /2) DD device available in both 24-pin DIL and SMD package versions. 1 ...

Page 2

... Pin Number Function FX009A FX009A LG/ Serial Clock : This external clock pulse input is used to “clock in” the Control Data. See Figure 4, Data Load Timing. This input has an internal 1M pullup resistor Load/Latch : Governs the loading and execution of the control data. During serial data loading this input should be kept at a logical '0' to ensure that data rippling past the latches has no effect ...

Page 3

... A noisy or badly regulated power supply can cause instability and/or variance of selected gains. (b) Care should be taken on the design and layout of the printed circuit board. (c) All external components (Figure 2) should be kept close to the FX009A package. (d) Inputs and outputs should be screened wherever possible. (e) Tracks should be kept short. SINAD (dB) 60 ...

Page 4

... The gain of each amplifier block (Channel 1 to Channel 8) in the FX009A is set by a separate 8-bit data word ( bit 7 to bit 0 ). This 8-bit word, consisting of 4 Address bits (bit 7 to bit 4) and 4 Gain Control bits (bit 3 to bit 0), is loaded to the Control Data Input in serial format using the external data clock ...

Page 5

... Total device dissipation @ AMB Derating Operating temperature range: FX009A J FX009A LG/LS Storage temperature range: FX009A J FX009A LG/LS Operating Limits All device characteristics are measured under the following conditions unless otherwise specified 5.0V Audio Level 0dB ref: = 775mVrms. Amplifier Gain Set = 0dB. DD AMB Characteristics ...

Page 6

... Package Outlines The FX009A is available in the package styles outlined below. Mechanical package diagrams and specifications are detailed in Section 10 of this document. Pin 1 identification marking is shown on the relevant diagrams and pins on all package styles number anti- clockwise when viewed from the top. ...

Page 7

... CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. ...

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