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DATA BULLETIN
MX019 Quad Digital Control Amplifier
FEATURES
 4 Digitally Controlled Amplifiers
 15 Gain/Attenuation Steps
 3 Amplifiers
± 3dB Range in 0.43dB Steps
 1 'Volume' Amplifier
±14dB Range in 2dB Steps
 8-Bit Serial Data Control
 Output Mute Function
APPLICATIONS
 Gain Control Applications
Audio
Data
 Telecommunications, Radio, & Industrial
Applications
SERIAL CLOCK
INPUT
SERIAL DATA
INPUT
1
Ch1
8-BIT SERIAL DATA INPUT
LOAD/LATCH
23
LOAD/LATCH
4
VOLUME
Ch4
VDD
VBIAS
Ch2
2
VSS
CHIP ADDRESS
3
Ch3
21 43
CONTROLLED AUDIO OUTPUT LINES
The MX019 Digitally Adjustable Amplifier Array replaces trimmer potentiometers and volume controls in
Cellular, LMR, Telephony and Communication applications where voice or data signals need adjustment.
The MX019 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, while 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 MX019s in a system. The MX019 uses the host microprocessor to digitally control the set-up of all
audio levels during development, production/calibration, and operation. Such applications include:
1. 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.
2. Automatic Dynamic Compensation of drift caused by variations in temperature, linearity, etc.
3. Fully automated servicing and re-alignment.
The MX019 is a low-power, single 5-volt CMOS device available in 24-pin TSSOP (MX019TN), 16-pin SOIC
(MX019DW), 16-pin CDIP (MX019J) and 16-pin PDIP (MX019P) package versions.
1998 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480077.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies

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Quad Digital Control Amplifier
Section
2
CONTENTS
MX019
Page
1. Block Diagram
2. Signal List
3. External Components
4. General Description
4.1 Control Data and Timing
4.1.1 Data Loading
4.1.2 Timing
5. Application
6. Performance Specification
6.1 Electrical Performance
6.1.1 Absolute Maximum Ratings
6.1.2 Operating Limits
6.1.3 Operating Characteristics
6.2 Packaging
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
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1998 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480077.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies

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Quad Digital Control Amplifier
1. Block Diagram
3
MX019
SERIAL CLOCK
INPUT
SERIAL DATA
INPUT
1
Ch1
8-BIT SERIAL DATA INPUT
LOAD/LATCH
23
LOAD/LATCH
4
VOLUME
Ch4
VDD
VBIAS
Ch2
2
VSS
CHIP ADDRESS
3
Ch3
21 43
CONTROLLED AUDIO OUTPUT LINES
Figure 1: Device Block Diagram
1998 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480077.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies

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Quad Digital Control Amplifier
2. Signal List
4
MX019
Pin No.
J/P TN
DW
11
22
34
45
56
67
78
8 12
9 13
10 14
11 17
12 18
13 19
14 20
15 23
16 24
Name
Description
Serial Clock This external clock pulse input is used to “clock in” the Control Data. See
Figure 3. This input has an internal 1M pullup resistor.
Load/ Latch
This input 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. When all 8 bits have been loaded,
this input should be strobed '0 - 1 - 0' to latch the new data in. Data is
executed on the falling edge of the strobe. If the Load /Latch input is used
this pin should be left open circuit. This input has an internal 1M pullup
resistor.
LOAD / LATCH This inverted Load/ Latch input governs the loading and execution of control
data. During serial data loading this input should be kept at a logical '1' to
ensure that data rippling past the latches has no effect. When all 8 bits have
been loaded, this input should be strobed '1' - '0' - '1' to latch the new data in.
Data is executed on the rising edge of the strobe. If the Load/ Latch input is
used this pin should be left open circuit. This input has an internal 1M
pulldown resistor.
Ch1 Input
Analog Inputs :
Ch2 Input
These individual amplifier inputs are self-biasing; AC input analog signals
must be capacitively coupled to these pins, as shown in Figure 2.
Ch3 Input Note that amplifiers Ch1 to Ch4 are 'inverting amplifiers.'
Ch4 Input
VSS Negative supply rail (GND).
VBIAS
The output of the on-chip bias circuitry, held at VDD/2. This pin should be
decoupled to VSS as shown in Figure 2.
Ch4 Output
Controlled Analog Outputs :
Ch3 Output These are individual "Gain Controlled" amplifier outputs. Ch1 to Ch3 range
from -3dB to +3dB in 0.43dB steps, Ch4 can be utilized as a volume control,
Ch2 Output ranging from -14dB to +14dB in 2.0dB steps. In the “OFF” mode there is no
Ch1 Output output from the selected amplifier.
Chip Address A logic input to select one of two MX019 ICs in a system (see Table 1). This
input has an internal 1M pulldown resistor.
Control Data
Input
Operation of the 4 amplifier channels (Ch1 – Ch4) is controlled by the 8 bits
of data entered serially at this pin. The data is entered (bit 7 to bit 0) on the
rising edge of the external Serial Clock. The data format is described in
Table 1, Table 2 and Figure 3. This input has an internal 1M pullup resistor.
VDD Positive supply rail. A single +5V power supply is required.
1998 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480077.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies

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Quad Digital Control Amplifier
3. External Components
5
SERIAL CLOCK INPUT
LOAD/LATCH
LOAD/LATCH
CHANNEL 1 INPUT
CHANNEL 2 INPUT
CHANNEL 3 INPUT
CHANNEL 4 INPUT
C1
C2
C3
C4
VSS
1 16
2 15
3 14
4 13
MX019J
5 12
6 11
7 10
89
VDD
CONTROL DATA INPUT
CHIP ADDRESS
CHANNEL 1 OUTPUT
CHANNEL 2 OUTPUT
CHANNEL 3 OUTPUT
CHANNEL 4 OUTPUT
VBIAS
C5
MX019
VDD
C6
C1 to C4
C5
C6
0.1µF
1.0µF
1.0µF
± 20%
± 20%
± 20%
Figure 2: Recommended External Components
Notes:
1. Channel Amplifiers 1 to 4 are inverting amplifiers.
2. Analog input capacitors C1 to C4 are only required for AC input signals, DC input signals do not
require these components.
4. General Description
4.1 Control Data and Timing
The gain of each amplifier block (Channel 1 to Channel 4) in the MX019 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.
4.1.1 Data Loading
The 8-bit data word is loaded bit 7 first and bit 0 last.
Bit 7 must be a logic “1” to address the chip.
If bit 7 in the word is a logic “0” that 8-bit word will not be executed. The Chip Address input permits the use of
two devices in a system by indicating to the chip what its address is, a “1” or a “0.” Bit 6 in the address section
of the control word is then used to select which device is being controlled. Figure 3 shows the timing
information required to load and operate this device.
Data is loaded to the MX019 on the rising edge of the Serial Clock. Loaded data is executed on the falling
(rising) edge of the Load/ Latch ( Load /Latch) pulse.
Table 1 shows the format of each 4-bit Address word, Table 2 shows the format of each Gain Control word
with Figure 3 describing the data loading operation and timing.
1998 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480077.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies