CMLMICRO MX806AJ

DATA BULLETIN
MX806A
Audio Processor
Features
Half-Duplex Audio Processor
Dynamic Control of Signal Levels
Performs Signal Conditioning and
Filtering requirements for both
Transmit and Receive
SERIAL
CLOCK
CHIP
SELECT
Three separate signal sections:
Input process
Main Process
Mixing and Output Drives
Low Power Operation
Member of DBS800 Family (C-BUS
Compatible)
COMMAND
DATA
POWER
SUPPLY
C-BUS INTERFACE
TX
MIC IN
MIC. AMP
VOGAD AMP
HIGHPASS
FILTER
INPUT
PROCESS
#
VOGAD SENSE
#
#
VOGAD
SENSE
#
GAIN
SET
RX
AUDIO IN DE-EMPHASIS
FILTER
#
#
ATTENUATOR
Voice
Sub-Audio
Tone
MSK,etc.
VOGAD
SENSE
OR
MOD
IN
#
PRIMARY
AND
SECONDARY
AUDIO
INPUTS
CALIBRATION INPUT
#
MOD
OUT
MAIN
PROCESS
OUT
#
#
TRANSMITTER
MODULATION
DRIVES
ATTENUATOR
#
MODULATION 2
OUT
PRE-EMPHASIS
LIMITING
FILTERING
GAIN SETTING
MAIN PROCESS
MODULATION 1
OUT
OUTPUT DRIVES
MODULATION
MIXER AMP
#
XTAL/CLOCK
XTAL
BUFFER
CLOCK
GENERATOR
ATTENUATOR
LOUDSPEAKER
AUDIO
TO EXTERNAL EXTERNAL AUDIO
AUDIO PROCESSES PROCESS IN
The MX806A LMR audio processor is intended too primarily to operate as the “Audio Terminal” or radio
systems using the DBS800 Digitally Integrated Baseband Subsystem.
The MX806A half-duplex device has signal paths and level setting elements that are configured and adjusted
by digital information sent from the radio microcontroller using C-BUS protocol. (C-BUS is the serial interface
for all DBS 800 ICs.)
The Signal Path is divided into three sections: Input Process, Main process, and Mixing and Output Drives.
If selected, signal level stability and output accuracy of the MX806A is maintained by a voltage-controlled gain
system using selectable signal-level detectors. Signal levels can be dynamically controlled to provide
“dynamic compensation” for factors such as temperature drift, VCO non-linearity, etc.
The MX806A audio stages can be completely disabled – or the whole IC can be placed into powersave mode,
leaving only clock and C-BUS circuitry active.
The MX806A may be used with a 5.0V power supply and is available in the following packages:
24-pin SOIC (MX806ADW), 24-pin PLCC (MX806ALH), and 24-pin PDIP (MX806AP).
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
2
MX806A
Contents
Section
Page
1 Block Diagram................................................................................................................ 3
2 Signal List....................................................................................................................... 4
3 External Components.................................................................................................... 6
4 General Description....................................................................................................... 7
4.1
4.2
Signal Path .......................................................................................................................... 7
VOGAD................................................................................................................................ 7
4.2.1
4.3
VOGAD Components Calculations – Figure 2 and Figure 5..................................................... 8
Calibration Methods............................................................................................................. 8
4.3.1
TX Calibration: From Mic. In to Modulator Drives Out ............................................................. 8
4.3.2
RX Calibration: From RX Audio In to Audio Out ...................................................................... 8
5 Controlling Protocol .................................................................................................... 10
5.1.1
Control Command – (Preceded by A/C 10H).......................................................................... 11
5.1.2
Mode Command – (Preceded by A/C 11H) ............................................................................ 12
5.1.3
Modulator Levels – (Preceded by A/C 12H) ........................................................................... 13
5.1.4
Volume Set – (Preceded by A/C 13H) .................................................................................... 15
6 Application Notes ........................................................................................................ 16
7 Performance Specifications........................................................................................ 17
7.1
7.2
Electrical Specifications..................................................................................................... 17
7.1.1
Absolute Maximum Limits ....................................................................................................... 17
7.1.2
Operating Limits...................................................................................................................... 17
7.1.3
Operating Characteristics ....................................................................................................... 18
7.1.4
Timing ..................................................................................................................................... 21
Packages........................................................................................................................... 22
MXCOM, Inc. reserves the right to change specifications at any time without notice.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
3
MX806A
1 Block Diagram
SERIAL
CLOCK
CHIP
SELECT
COMMAND
DATA
POWER
SUPPLY
C-BUS INTERFACE
#
TX
MIC IN
MIC. AMP
VOGAD AMP
HIGHPASS
FILTER
INPUT
PROCESS
#
#
#
VOGAD
SENSE
#
GAIN
SET
RX
AUDIO IN DE-EMPHASIS
FILTER
#
#
ATTENUATOR
Voice
Sub-Audio
Tone
MSK,etc.
VOGAD
SENSE
OR
MOD
IN
#
PRIMARY
AND
SECONDARY
AUDIO
INPUTS
CALIBRATION INPUT
VOGAD SENSE
MOD
OUT
MAIN
PROCESS
OUT
#
#
TRANSMITTER
MODULATION
DRIVES
ATTENUATOR
#
MODULATION 2
OUT
PRE-EMPHASIS
LIMITING
FILTERING
GAIN SETTING
MAIN PROCESS
MODULATION 1
OUT
OUTPUT DRIVES
MODULATION
MIXER AMP
#
XTAL/CLOCK
XTAL
BUFFER
CLOCK
GENERATOR
ATTENUATOR
LOUDSPEAKER
AUDIO
TO EXTERNAL EXTERNAL AUDIO
AUDIO PROCESSES PROCESS IN
Figure 1: Block Diagram
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
4
MX806A
2 Signal List
Pin
1
Signal
Xtal
Description
The output of the 4.032MHz on-chip clock oscillator. External components are
required at this output when a Xtal is used. See Figure 2.
2
Xtal/Clock
The input to the on-chip 4.032MHz clock oscillator inverter. A 4.032MHz Xtal or
externally derived clock should be connected here. See Figure 2. This clock
provides timing for on-chip elements, filters, etc.
3
Serial Clock
4
Command Data
This is the ‘C-BUS’ serial Clock input. This clock, produced by the
microcontroller, is used for transfer timing of commands and data to and from the
MX805A. See Section 6 and Section 7.1.4.
This is the ‘C-BUS’ serial data input from the microcontroller. Command Data is
loaded to this device in 8-bit bytes, MSB (bit 7) first and LSB (bit 0) last,
synchronized to the Serial Clock. The Command/Data instruction is acted upon
at the end of loading the whole instruction. Command information is detailed in
Table 3 through Table 7. See Section 6 and Section 7.1.4.
5
CS
Chip Select . This is the ‘C-BUS’ data loading control function. This input is
provided by the microcontroller. Command Data transfer sequences are initiated,
completed or aborted by the CS signal. See Section 6 and Section 7.1.4.
6
VOGAD OUT
The error-voltage output of the selected VOGAD sensor. This output, with
external attack and decay setting components, should be connected as in Figure
2 and Figure 3, to the VOGAD In pin.
7
RX Audio In
The audio input to the MX806A from the radio receiver’s demodulator circuits.
This input, which requires AC coupling with capacitor C12, is selected via a
Control Command bit.
8
VOGAD In
9
VBIAS
10
Mic In (+)
11
Mic In (-)
12
VSS
The gain control signal from the selected VOGAD sensor (VOGAD Out) to the
Input Process voltage-controlled amplifier. The required sensor is selected via a
Mode Command. The choice of two sensors enables gain control from either the
Input Process or an External Process. External attack and decay setting
components should be applied as recommended. See Figure 2 and Figure 3.
The output of the on-chip analog circuitry bias system, held internally at VDD/2.
This pin should be decoupled to VSS by capacitor C10. See Figure 2.
The non-inverting input to the microphone Op-Amp. This input requires external
components for Op-Amp gain/attenuation setting as shown in Figure 2.
The inverting input to the microphone Op-Amp. This input requires external
components for Op-Amp gain/attenuation setting as shown in Figure 2.
Negative Supply (GND)
13
Mic Out
14
The output of the Microphone Op-Amp, used with the Mic In (-) input to provide
the required gain/attenuation using external components as shown in Figure 2.
The external components shown are to assist in the use of this amplifier with
wither inverting or non-inverting inputs. During Powersave (Volume Command
this output is placed at VSS.)
Processed Audio In The input to the device from such external audio processed as Voice Store and
Retrieve or Frequency Domain Scrambling. This input, which requires AC
Coupling with capacitor C13, is selected by a Mode Command bit.
15
External Audio
Process
The buffered output of the Input Processing Stage. Its purpose is to further
external audio processing stages prior to re-introduction at the Processed Audio
In Pin.
16
Calibration Input
17
Main Process Out
A unique audio input to be used for dynamic balancing of the modulator drives for
measuring Deviation Limiter levels. A CUE (beep) input from the MX803 Audio
Tone Processor can be entered on this line. This audio input must be externally
biased. It is selected via a Mode Command bit.
The output of the Main Process stage. This output should be mixed with any
additional system audio inputs (Audio, Sub-Audio Signaling, MSK) in the on-chip
Modulation Summing Amplifier. External components shown in Figure 2 should
be used as required.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
5
MX806A
Pin
18
19
Signal
Sum In
Sum Out
Description
The input and output terminals of the on-chip Modulation Summing Amplifier.
External components are required for input signals and gain/attenuation setting as
shown in Figure 2. For single-signal, no gain requirements, Main Process Out
may be linked directly to Modulation In.
The final, composite modulating signal to VCO (Mod 1) and Reference (Mod 2)
Output Drives
The processed audio signal output intended as a received audio (volume) output.
Though normally used in the RX mode, operation in TX is permitted. The output
level of this attenuator is controlled via a Volume Set command. During
Powersave this output is placed at VSS.
20
Modulation In
21
Audio Output
22
Modulation 1 Drive
23
Modulation 2 Drive
The drive to the radio modulator Voltage Controlled Oscillator (VCO) from the
composite audio summing stage.
The drive to the radio modulator Reference Oscillator from the composite audio
summing stage.
Note: These VCO output attenuators are individually adjustable using the
Modulator Level command. During Powersave these outputs are placed at VSS.
24
VDD
Positive Supply. A single 5.0V regulated supply is required. Levels and voltages
within this Audio Processor are dependent upon this supply.
Table 1: Signal List
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
6
MX806A
3 External Components
VDD
VDD
R6
XTAL
SEE INSET 1
XTAL/CLOCK
SERIAL CLOCK
COMMAND DATA
CHIP SELECT
VOGAD OUT
C12
RX AUDIO IN
VOGAD IN
VBIAS
R5
MIC. IN (+)
MIC. IN (-)
VSS
C10
C8
R12
1
2
3
4
5
6
7
8
9
10
11
12
MX806AJ
24
23
22
21
20
19
18
17
16
15
14
13
VDD
C9
MODULATION 2 DRIVE
MODULATION 1 DRIVE
AUDIO OUT
MOD. IN
EXTERNAL SIGNAL
AND
DATA INPUTS
C11
MIX OUT
R9
R8
MIX IN
MAIN PROCESS
OUT
R7
R10
R11
CALIBRATION IN
C14
EXTERNAL AUDIO PROCESS
C13
PROCESSED AUDIO IN
MIC. OUT
SEE INSET 2
R13
VSS
INSET 2
INSET 1
C5
XTAL
1
MX806AJ
X1
R4
MIC. IN (+)
XTAL/CLOCK
2
C2
C1
C7
C6
VBIAS
C4
R2
R1
10
+
11
-
13
MIC. OUT
MX806AJ
MIC. IN (-)
R3
C3
Figure 2: Recommended External Components
Component
R1
Notes
Value
10k
Tolerance
±10%
Component
C2
R2
10k
±10%
R3
20k
R4
Notes
Value
.47F
Tolerance
±20%
C3
270pF
±20%
±10%
C4
270pF
±20%
20k
±10%
C5
0.1F
±20%
R5
10k
±10%
C6
33pF
±20%
R6
2.2M
±10%
C7
5-65pF
±20%
R7
100k
±10%
C8
1.0F
±20%
R8
100k
±10%
C9
1.0F
±20%
R9
100k
±10%
C10
1.0F
±20%
R10
100k
±10%
C11
22pF
±20%
R11
100k
±10%
C12
0.1F
±20%
R12
2.2M
±10%
C13
0.01F
±20%
R13
470k
±10%
C14
0.01F
±20%
C1
.47F
±20%
X1
4.00MHz
Table 2: Recommended External Components
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
7
MX806A
Recommended External Component Notes:
1. Input Op-Amp gain/attenuation components (voltage gain = 6.0dB) are shown in Inset 1 is a differential
configuration to demonstrate the versatility of this input. Components for a single (+ or -) input may be
used.
2. Resistor values R7 to R11 (summation components) are dependent upon application and configuration
requirements.
3. Xtal circuit capacitors C6 (CD) and C7 (CG) shown in Inset 2 are recommended in accordance with MXCOM’s Crystal Oscillator Application Note. Circuit drive and drain resistors are incorporated on-chip.
Operation of any MX-COM IC without a Xtal clock input may cause device damage. To minimize damage
in the event of a Xtal/drive failure, you should install a current limiting device (resistor or fast-reaction
fuse) on the power-input (VDD).
4 General Description
The MX806A LMR audio processor is intended too primarily to operate as the “Audio Terminal” or radio
systems using the DBS800 Digitally Integrated Baseband Subsystem.
The MX806A half-duplex device has signal paths and level setting elements that are configured and adjusted
by digital information sent from the radio microcontroller using C-BUS protocol. (C-BUS is the serial interface
for all DBS 800 ICs.)
4.1
Signal Path
The Signal path is divided into three sections:
Input Process: This stage has selectable TX/RX paths. Transmits voice signals pass through microphone
pre-amplifier, voltage controlled gain (VOGAD) and highpass filter stages. Received audio is de-emphasized.
This initial audio, after line-in gain adjustment, may be switched to external audio processes (such as
scrambling) or to the internal Main Process stages.
Main Process: Conditioning for the input or external process signals is completed in this stage. It is
comprised of pre-emphasis, high and lowpass switched capacitor filters and a deviation limiter.
Mixing and Output Drives: Main audio for transmission is mix with signaling and data from external sources
(other DBS 800 ICs) to provide the composite signal for the digitally adjustable transmitter modulation drives.
Received audio level is adjusted for output to loudspeaker circuitry.
If selected, signal level stability and output accuracy of the MX806A is maintained by a voltage-controlled gain
system using selectable signal-level detectors. Signal levels can be dynamically controlled to provide
“dynamic compensation” for factors such as temperature drift, VCO non-linearity, etc.
The MX806A audio stages can be completely disabled – or the whole IC can be placed into powersave mode,
leaving only clock and C-BUS circuitry active.
4.2
VOGAD
The overall Gain Control system of the MX806A consists of 2 selectable signal peak detectors whose output
is fed via external integrating components to adjust the gain of the Voltage Controlled Amplifier positioned in
the TX Input Process Path. The transmit input signals is presented to Peak Detector 1 or 2. The Peak
Detectors are enabled individually by a Mode Command. When the input signal exceeds the peak - to - peak
threshold of the detector, a 5-volt level is produced at the VOGAD Out pin. This level remains for as long as
the signal exceeds the threshold. The integrated level to the VOGAD In pin causes the Voltage Controlled
Amplifier gain to be reduced. As can be seen from Figure 3 and Figure 5, Peak Detector 1 allows control of
the audio level to the external audio process and Peak Detector 2 allows control of transmit deviation levels.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
8
EXTERNAL INTEGRATION COMPONENTS
MX806A
R6
VDD
R5
VOGAD
IN
R12
C8
VOGAD
OUT
VSS
MIC. OUT
MIC. IN
MIC. IN
HI PEAK
DETECTOR
-
HI
TX
+
TX
DRIVES
- LO PEAK
DETECTOR
VOGAD
(Voltage Controlled)
AMPLIFIER
MAIN PROCESS
TX INPUT PROCESS
RX
DRIVE
CAL
INPUT
To EXTERNAL AUDIO PROCESSES
ä
PROCESSED AUDIO IN
Figure 3: VOGAD Sensors and Timing Components (from Figure 5)
VOGAD attack and decay times are set using the external components shown in Figure 2 and Figure 3. They
are calculated as described below.
4.2.1
VOGAD Components Calculations – Figure 2 and Figure 5
Provided R5 1.0k and R6 R12 R5
Then
Attack Time (TA ) R5 x C8
Decay Time (TD ) 4.3
R6 x C8
2
Calibration Methods
To effectively null all internal IC tolerance, the following initial calibration routine is suggested.
4.3.1
TX Calibration: From Mic. In to Modulator Drives Out
Disable Peak Detectors (Mode Command)
Set Transmitter Drives to 0dB (Mod. Levels Set)
Pre-emphasis may be employed as required (Control Command)
Set Input Level Amp to 0dB Control Command)
1. Mic. In = 250mVRMS at 1kHz. Set Process Gain Amp for output of 1440mVP-P (100% deviation).
2. With Process Gain Amp set as 1 and with Mic. In = 25mVRMS at 1kHz, set the Input Level Amp for an
output level of 308mVRMS (60% deviation)
4.3.2
RX Calibration: From RX Audio In to Audio Out
Set Audio Output Drive In to Audio Out
Leave Process Gain Amp set as 1 (See Section 4.3.1)
3. With and RX Audio In level of between 154mVRMS and 308mVRMS (See Section 7) at 1kHz, set the Input
Level Amp for and output level of 308mVRMS.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
1998 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
REF.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
XTAL
AUDIO
SIGNALING
PROCESSOR
DATA/VOICE
STORE AND
RETRIEVE
CODEC
4.032MHz XTAL
AUDIO
MX803A
RADIO
AND
CLUSTER
MICROCONTROLLER
MX802
RX (AUDIO, MSK, TONE, SUB-AUDIO) SIGNALS
TX SUB-AUDIO SIGNALS
1200 BAUD MSK SIGNALS
TX TONE AUDIO SIGNALS AND CUE
MX806A
RECEIVE
AND
TRANSMIT
AUDIO
PROCESSOR
DRAM
EXTERNAL DATA
XTAL
SUB-AUDIO
SIGNALING
PROCESSOR
MX805A
XTAL
MSK
MODEM
MX809
"C-BUS" SERIAL DATA SYSTEM
PROM
9
Figure 4 - MX806A Interfaced with Other DBS800 Elements
DEMOD
Receiver
VCO
MODL
Transmitter
Audio Processor
MX806A
Figure 4: MX806A Interfaced with Other DBS 800 Elements
All trademarks and service marks are held by their respective companies.
Doc. # 20480064.006
10
MX806A
➤
➤
➤
Audio Processor
Figure 5: LMR Audio Processor Explanatory Block Diagram
5 Controlling Protocol
Control of the functions and levels within the MX806A LMR Audio processor is by a group of
Address/Commands and appended data instructions from the system microcontroller. The use of these
instructions is detailed in the following paragraphs and tables.
Command Assignment
Address/Command Binary
HEX
MSB
Command Data
Table
LSB
General Reset
01
00000001
Control Command
10
00010000
+
1 byte
2
Mode Command
11
00010001
+
1 byte
3
Mod. Levels Set
12
00010010
+
2 bytes
4
Volume Set
13
00010011
+
1 byte
5
Table 3: C-BUS Address/Commands
In “C-BUS” protocol the MX806A is allocated Address/Command values 10H and 13H. C-BUS Command
Mode, Modulation and Volume assignments, and data requirements are given in Table 3 and illustrated in
Figure 5.
Commands and Data are only to be loaded in the group configurations detailed since the “C-BUS” interface
recognizes the first byte after Chip Select (logic “0”) as an Address/Command.
Function or Level control data, which is detailed in Table 4, Table 5, Table 6, and Table 7, is acted upon at
the end of the loaded instruction
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
11
MX806A
Upon power-up the value of the “bits” in this device will be random (either “0” or “1”). A General Reset
Command (01H) is required. This command is provided to “reset” all devices on the Command “Data line and
has the following effect on the MX806A:
5.1.1
Control Address Command
Loaded as 00H
Mode Address Command
Loaded as 00H
Volume Set
Loaded as 00H
Control Command – (Preceded by A/C 10H)
Settings
Control Bits
MSB
7
Audio Output (RX)
0
1
Disabled
Enabled
6
Modulation Drives
0
1
Disabled
Enabled
5
Pre-Emphasis
0
1
Bypass
Enabled
4
Input Select
0
1
RX In
Mic. In
3
2
1
0
Input Level Set
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Input Amp Disabled
–4.0dB
–3.0dB
–2.0dB
–1.0dB
0dB
1.0dB
2.0dB
3.0dB
4.0dB
5.0dB
6.0dB
7.0dB
8.0dB
9.0dB
10.0dB
Table 4: Control Commands
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
5.1.2
12
MX806A
Mode Command – (Preceded by A/C 11H)
Setting
Mode Bits
MSB
7
Drive Source
0
1
Signals
Calibration
6
Deviation Limiter
0
1
Disabled
Enabled
5
VOGAD
0
1
Disabled
Enabled
4
De-Emphasis
0
1
Enabled
Bypassed
3
Signal Select
0
1
Internal
External
2
1
0
Process Gain Set
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
–4.0dB
–3.0dB
–2.0dB
–1.0dB
0dB
1.0dB
2.0dB
3.0dB
Table 5: Mode Commands
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
5.1.3
13
MX806A
Modulator Levels – (Preceded by A/C 12H)
Setting
Modulator Drives
Byte 1
First byte for transmission
MSB
1998 MX-COM, Inc.
7
6
5
0
0
0
Must be “0”
4
3
2
1
0
VCO Drive Attenuation
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
12.4dB
12.0dB
11.6dB
11.2dB
10.8dB
10.4dB
10.0dB
9.6dB
9.2dB
8.8dB
8.4dB
8.0dB
7.6dB
7.2dB
6.8dB
6.4dB
6.0dB
5.6dB
5.2dB
4.8dB
4.4dB
4.0dB
3.6dB
3.2dB
2.8dB
2.4dB
2.0dB
1.6dB
1.2dB
0.8dB
0.4dB
0dB
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Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
14
MX806A
Setting
Modulator Drives
Byte 0
Last byte for transmission
MSB
7
6
5
0
0
0
Must be “0”
4
3
2
1
0
VCO Drive Attenuation
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
6.2dB
6.0dB
5.8dB
5.6dB
5.4dB
5.2dB
5.0dB
4.8dB
4.6dB
4.4dB
4.2dB
4.0dB
3.8dB
3.6dB
3.4dB
3.2dB
3.0dB
2.8dB
2.6dB
2.4dB
2.2dB
2.0dB
1.8dB
1.6dB
1.4dB
1.2dB
1.0dB
0.8dB
0.6dB
0.4dB
0.2dB
0dB
Table 6: Modulator Drive Levels
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
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Audio Processor
5.1.4
15
MX806A
Volume Set – (Preceded by A/C 13H)
Setting
Volume Set
MSB
7
5
Main Process Out
0
0
0
1
Enabled
Biased
5
Powersave
0
1
Chip Enabled
Powersaved
4
3
2
1
0
VCO Drive Attenuation
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
OFF
48.0dB
46.4dB
44.8dB
43.2dB
41.6dB
40.0dB
38.4dB
36.8dB
35.2dB
33.6dB
32.0dB
30.4dB
28.8dB
27.2dB
25.6dB
24.0dB
22.4dB
20.8dB
19.2dB
17.6dB
16.0dB
14.4dB
12.8dB
11.2dB
9.6dB
8.0dB
6.4dB
4.8dB
3.2dB
1.6dB
0dB
Table 7: Volume Set
Notes:
1. Command Loading: Address/Commands and data bytes must be loaded in accordance with the
information given in Figure 7.
2. The powersave function is enabled by bit 5 of the Volume Set Command (Table 7).
During Powersave all internal elements except the clock Generator and “C-BUS” interface are off. The
Mic Op-Amp and output Drive stage outputs are connected to VSS.
3. Modulator Drives are controlled separately, but the whole two-byte modulator Drive command must be
loaded for each requirement adjustment.
4.
Chip Select must be held at a logic “1” for the period “tCSOFF” between transactions.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
16
MX806A
6 Application Notes
To assist in rapid setting, this quick-reference list should be used with Figure 5.
Control
A/C = 10H
7
Audio Out (RX) Enable
6
Modulator Drive Enable
5
Pre-Emphasis Select
4
Input Select (RX/TX)
3-0
Input Level Set (-4dB to 10dB)
Mode
A/C = 11H
7
Drive Source
6
Derivation Limiter Enable
5
VOGAD Enable
4
De-emphasis Enable
3
Signal Select
2-0
Process Gain Set
Modulator Levels
A/C = 12H
Byte 1
7-5
“0”
4-0
Mod 1 Attenuation (0 to 12.4dB)
Byte 2
7-5
“0”
4-0
Mod 2 Attenuation (0 to 6.2dB)
Volume Set
A/C = 13H
7-6
“0”
5
Powersave
4-0
Volume Set Attenuation (0 to 48dB)
Table 8: Quick Reference List
Sets the Control, Mode and Volume Commands to 00H
MSB
GENERAL RESET
LSB
7
MSB
6
CONTROL COMMAND
4
3
2
1
0
TABLE 2
1
0
TABLE 3
1
0
TABLE 5
1
0
1 DATA BYTE
7
MSB
6
5
4
3
2
LSB
MODE COMMAND
1 DATA BYTE
7
MSB
6
5
4
3
2
LSB
VOLUME SET
1 DATA BYTE
7
MSB
5
LSB
6
5
4
3
2
7
6
5
4
3
2
1
0
TABLE 4
LSB
MODULATOR LEVELS SET
2 DATA BYTES - BYTE 1 (loaded first)
BYTE 0 (loaded last)
Figure 6: Examples of Command Data Configurations
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
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Audio Processor
17
MX806A
7 Performance Specifications
7.1
Electrical Specifications
7.1.1
Absolute Maximum Limits
Exceeding these maximum ratings can result in damage to the device.
General
Supply (VDD-VSS)
Voltage on any pin to VSS
Current
VDD
VSS
Any other pin
P / DW / LH Packages
Total allowable Power dissipation
at TAMB = 25C
Notes
Min.
-0.3
-0.3
Typ.
Max.
7.0
VDD + 0.3
Units
V
V
30
30
20
mA
mA
mA
800
mW
-30
-30
-20
10
Derating above 25C
mW/C above 25C
Operating Temperature
-40
85
C
Storage Temperature
-55
125
C
Table 9: Absolute Maximum Ratings
7.1.2
Operating Limits
Correct Operation of the device outside these limits is not implied.
Notes
Supply (VDD-VSS)
Operating Temperature
Xtal Frequency
Min.
4.5
-40
Typ.
5.0
Max.
5.5
85
4.0
Units
V
C
MHz
Table 10: Operating Limits
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
7.1.3
18
MX806A
Operating Characteristics
For the following conditions unless otherwise specified.
VDD = 5.0V @ TAMB = 25C
Xtal/Clock Frequency = 4.0MHz, Audio Level 0dB ref. = 308mVRMS @ 1kHz (60% deviation, FM)
Notes
Static Values
Supply Current
All Elements Enabled
Maximum Powersave
“C-BUS” Interface
Input Logic “1”
Input Logic “0”
Input Current
Input Capacitance
Overall Performance
Microphone Input Level
Discriminator Input Level
Output Drive Level
60% Deviation
100% Deviation
Passband
Passband Ripple
Stopband Attenuation
@ 150Hz
@ 3400Hz
@ 6000Hz
@ 8000Hz to 20,000Hz
Signal Path Noise
TX
TX
RX
RX
Total Harmonic Distortion
RX or TX, 60% Deviation
Circuit Elements – Figure 5
Mic. Amp or Mod. Summation Amp
Open Loop Gain
Bandwidth
Input Impedance
Output Impedance
Open Loop
Closed Loop
De-emphasis
Slope
Gain
Input Impedance
1998 MX-COM, Inc.
Min.
Typ.
Max.
Units
8.0
0.7
15.0
1.5
mA
mA
3.5
1.5
1.0
-1.0
1, 2
2, 3
2, 4
2, 4, 5
6
7
6, 8
291
308
1440
297
-2
A
pF
308
mVRMS
mVRMS
10
30
9
9
326
3000
0.5
mVRMS
MVP-P
Hz
dB
12
2
36
60
dB
dB
dB
dB
-50
-45
-60
-55
dBp
dB
dB
dB
1.0
%
50.0
dB
kHz
20.0
10.0
M
6.0
k
600
-6.0
0
1
dB/octave
dB
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4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
7.5
25
154
V
V
M
Doc. # 20480064.006
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Audio Processor
19
MX806A
Notes
Voltage Controlled Gain Amp (VOGAD)
Gain
Non-Compression
Full-Compression
Input Impedance
Min.
2
10
10
M
1
k
10
M
mVP-P
mV + ve pk
1300
650
-1.0
1.0
dB
0
-1.0
0.75
1.0
1.0
1.25
dB
dB
dB
-0.1
0
0.1
dB
6.0
10.0
dB/octave
dB
-0.1
0
0.1
dB
708
-0.5
1300
1413
0.5
mVRMS
dB
-0.1
0
0.1
dB
3.0
0.5
1.25
dB
dB
dB
-4.0
-0.5
0.75
Transmitter Modulator Drives
Input Impedance
1.0
600
15.0
Mod. 1 Attenuator
Attenuation Range
Overall Tolerance
Step Size
Output Impedance
0
-1
0.2
Mod. 2 Attenuator
Attenuation Range
Overall Tolerance
Step Size
Output Impedance
0
-0.5
0.1
0.4
600
0.2
600
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4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Units
dB
dB
10.0
Logic “0”
1998 MX-COM, Inc.
Max.
6.0
-24
VOGAD Peak Detectors
Output Impedance
Logic “1” (Compress)
Hi/Lo Peak Detector Threshold
Hi Peak Detector Threshold
Input (Low + Highpass) Filter
Gain @ 1.0kHz
Input Level Amp
Gain Range
Overall Tolerance
Step Size
External Audio Buffer
Gain
Pre-emphasis (Main Process and VOGAD)
Slope
Gain @ 1.0kHz
Process Highpass Filter
Gain @ 1.0kHz
Deviation Limiter
Threshold
Gain
Process Lowpass Filter
Gain @ 1.0kHz
Process Gain Amp
Gain Range
Overall Tolerance
Step Size
Output Impedance
Typ.
k
12.4
1
0.6
dB
dB
dB
6.2
0.5
0.3
dB
dB
dB
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Audio Processor
20
MX806A
Notes
Audio Output Attenuator
Attenuation Range
Overall Tolerance
Step Size
Output Impedance
Min.
0
-1.0
1.1
Miscellaneous Impedances
Processed Audio Input
Typ.
Max.
Units
48.0
1.0
2.1
dB
dB
dB
1.6
600
500
k
Calibration Input
500
k
External Process Out
100
RX with De-emphasis Bypass
25.0
k
Table 11: Operating Characteristics
Operating Characteristics Notes:
1. Producing an output of 0dB with the Mic. Op-Amp set to 6dB (as shown in Figure 2) and the Modulator
Drives set to 0dB.
2. With Output Drives set to 0dB and the system calibrated as described in the Application Notes.
3. Input level range for 0dB output, by adjustment of the Input Level Amp.
4. It is recommended that these output levels will produce 60% or 100% deviation in the transmitter.
5. With the microphone input level 20dB above the level required to produce 0dB at the Output Drives.
6. Between Microphone or RX inputs to Modulator or Audio Outputs.
7. Deviation from the ideal overall response including the pre- or de-emphasis slope.
8. Excluding the effect of pre- or de-emphasis slope.
9. In a 30kHz bandwidth.
10. Using pre-emphasis in the TX path.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
7.1.4
21
MX806A
Timing
Timing Parameters for two-way communications between the C and the MX805A on the C-BUS are shown
in Table 12.
C-BUS Timing
tCSE
Chip Select Low to First Serial Clock Rising Edge
Min.
2.0
Typ.
Max.
Units
tCHS
Last Serial Clock Rising Edge to Chip Select High
4.0
s
tCSOFF
Chip Select High time between transactions
2.0
s
tNXT
Inter-Byte Time
4.0
s
tCK
Serial Clock Period
2.0
s
s
Table 12: Timing Information
Notes:
1. Command Data is transmitted to the peripheral MSB (bit 7) first, LSB (bit 0) last. Reply Data is read from
the MX805A MXB (bit 7) first, LSB (bit 0) last.
2. Data is clocked into the MX805A and into the microcontroller on the rising Serial Clock edge.
3. Loaded data instructions are acted upon at the end of each individual, loaded byte.
4. To allow for differing microcontroller serial interface formats, the MX806A will work with either polarity
Serial Clock pulses.
t CSOFF
CHIP SELECT
t CSE
t NXT
t CSH
t NXT
SERIAL CLOCK
t CK
COMMAND DATA
7
6
5
4
3
2
1
MSB
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
LSB
ADDRESS/COMMAND
BYTE
FIRST DATA BYTE
LAST DATA BYTE
Logic level is not important
Figure 7: C-BUS Timing Information
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
7.2
22
MX806A
Packages
A
Package Tolerances
B
DIM.
A
B
C
E
E1
H
J
J1
K
L
P
T
Y
E
E1
Y
T
PIN1
K
H
L
C
J
J1
MIN.
TYP.
MAX.
1.270 (32.26)
1.200 (30.48)
0.555 (14.04)
0.500 (12.70)
0.151 (3.84)
0.220 (5.59)
0.600 (15.24)
0.670 (17.02)
0.590 (14.99)
0.625 (15.88)
0.015 (0.38)
0.045 (1.14)
0.015 (0.38)
0.023 (0.58)
0.040 (1.02)
0.065 (1.65)
0.066 (1.67)
0.074 (1.88)
0.121 (3.07)
0.160 (4.05)
0.100 (2.54)
0.008 (0.20)
0.015 (0.38)
7°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
P
Figure 8: 24-pin PDIP Mechanical Outline: Order as part no. MX806AP
Package Tolerances
A
Z
B
Alternative Pin
Location
Marking
E
W
L
T
PIN 1
X
Y
C K
H
J
P
DIM.
A
B
C
E
H
J
K
L
P
T
W
X
Y
Z
MIN.
TYP.
MAX.
0.613 (15.57)
0.299 (7.59)
0.105 (2.67)
0.419 (10.64)
0.020 (0.51)
0.020 (0.51)
0.046 (1.17)
0.597 (15.16)
0.286 (7.26)
0.093 (2.36)
0.390 (9.90)
0.003 (0.08)
0.013 (0.33)
0.036 (0.91)
0.050 (1.27)
0.016 (0.41)
0.050 (1.27)
0.0125 (0.32)
0.009 (0.23)
45°
10°
0°
7°
5°
5°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
Figure 9: 24-pin SOIC Mechanical Outline: Order as part no. MX806ADW
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
All trademarks and service marks are held by their respective companies.
Audio Processor
23
E
B
C
Package Tolerances
K
Y
DA
W
J
W
T
PIN 1
MX806A
H
P
G
DIM.
A
B
C
D
E
F
G
H
J
K
P
T
W
Y
MIN.
TYP.
MAX.
0.380 (9.61)
0.409 (10.40)
0.380 (9.61)
0.409 (10.40)
0.128 (3.25)
0.146 (3.70)
0.435 (11.05)
0.417 (10.60)
0.417 (10.60)
0.435 (11.05)
0.250 (6.35)
0.250 (6.35)
0.023 (0.58)
0.018 (0.45)
0.022 (0.55)
0.047 (1.19)
0.048 (1.22)
0.049 (1.24)
0.051 (1.30)
0.006 (0.152)
0.009 (0.22)
45°
30°
6°
NOTE : All dimensions in inches (mm.)
Angles are in degrees
F
Figure 10: 24-pin PLCC Mechanical Outline: Order as part no. MX806ALH
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Doc. # 20480064.006
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CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CML Product Data
In the process of creating a more global image, the three standard product semiconductor
companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc
(USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst
maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA)
Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML
Microcircuits.
These companies are all 100% owned operating companies of the CML Microsystems Plc
Group and these changes are purely changes of name and do not change any underlying legal
entities and hence will have no effect on any agreements or contacts currently in force.
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.
In the latter part of 1996, both companies adopted the common prefix: CMX.
This notification is relevant product information to which it is attached.
CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking
On CML Microcircuits (USA) products, the ‘MX-COM’ textual logo is being replaced by a ‘CML’
textual logo.
Company contact information is as below:
CML Microcircuits
(UK)Ltd
CML Microcircuits
(USA) Inc.
CML Microcircuits
(Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
COMMUNICATION SEMICONDUCTORS
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon,
Essex, CM9 6WG, England
Tel: +44 (0)1621 875500
Fax: +44 (0)1621 875600
[email protected]
www.cmlmicro.com
4800 Bethania Station Road,
Winston-Salem, NC 27105, USA
Tel: +1 336 744 5050,
0800 638 5577
Fax: +1 336 744 5054
[email protected]
www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/
06 Mactech Industrial Building,
Singapore 349307
Tel: +65 7450426
Fax: +65 7452917
[email protected]
www.cmlmicro.com
D/CML (D)/2 May 2002