Datasheet MX806ADW, MX806AP Datasheet (MX COM)

DATA BULLETIN

MX806A

Audio Processor

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Features



Half-Duplex Audio Processor



Dynamic Control of Signal Levels



Performs Signal Conditioning and
Filtering requirements for both
Transmit and Receive



Three separate signal sections:

Input process
Main Process
Mixing and Output Drives



Low Power Operation



Member of DBS800 Family (C-BUS
Compatible)

C-BUS INTERFA CE

MIC. AMP

VOGAD AMP

HIGHPASS

FILTER

GAIN

SET

PRE-EMPHASIS

LIMITING

FILTERING

GAIN SETTING

MODULATION

MIXER AMP

VOGAD
SENSE

VOGAD
SENSE

OR

MAIN PROCESS

CLOCK

GENERAT OR

BUFFER

ATTENUAT OR

ATTENUAT OR

ATTENUAT OR

INPUT
PROCESS

DE-EMPHASIS

FILTER

OUTPUT DRIVES

#

#

#

#

#

## #

#

#

#

#

LOUDSPEAKER

AUDIO

MODULATION 2

OUT

MODULATION 1

OUT

TRANSMITTER

MODULATION

DRIVES

MOD

OUT

MOD

IN

MAIN

PROCESS

OUT

PRIMARY

AND

SECONDARY

AUDIO

INPUTS

Voice

Sub-Audio

Tone

MSK,etc.

COMMAND

DATA

SERIAL
CLOCK

CHIP

SELECT

VOGAD SENSE

CALIBRATION INPUT

TX

MIC IN

RX

AUDIO IN

XTAL/CLOCK

XTAL

TO EXTERNAL

AUDIO PROCESSES

EXTERNAL AUDIO

PROCESS IN

POWER
SUPPL Y

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).

Audio Processor 2 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Contents

Section Page

1 Block Diagram................................................................................................................3

2 Signal List.......................................................................................................................4

3 External Components....................................................................................................6

4 General Description.......................................................................................................7

4.1 Signal Path .......................................................................................................................... 7

4.2 VOGAD................................................................................................................................ 7

4.2.1 VOGAD Components Calculations – Figure 2 and Figure 5.....................................................8

4.3 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 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

7.2 Packages........................................................................................................................... 22

MXCOM, Inc. reserves the right to change specifications at any time without notice.

Audio Processor 3 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

1 Block Diagram

C-BUS INTERFACE

MIC. AMP

VOGAD AMP

HIGHPASS

FILTER

GAIN

SET

PRE-EMPHASIS

LIMITING

FILTERING

GAIN SETTING

MODULATION

MIXER AMP

VOGAD
SENSE

VOGAD
SENSE

OR

MAIN PROCESS

CLOCK

GENERATOR

BUFFER

ATTENUATOR

ATTENUATOR

ATTENUATOR

INPUT
PROCESS

DE-EMPHASIS

FILTER

OUTPUT DRIVES

#

#

#

#

#

## #

#

#

#

#

LOUDSPEAKER

AUDIO

MODULATION 2

OUT

MODULATION 1

OUT

TRANSMITTER

MODULATION

DRIVES

MOD

OUT

MOD

IN

MAIN

PROCESS

OUT

PRIMARY

AND

SECONDARY

AUDIO

INPUTS

Voice

Sub-Audio

Tone

MSK,etc.

COMMAND

DATA

SERIAL
CLOCK

CHIP

SELECT

VOGAD SENSE

CALIBRATION INPUT

TX

MIC IN

RX

AUDIO IN

XTAL/CLOCK

XTAL

TO EXTERNAL

AUDIO PROCESSES

EXTERNAL AUDIO

PROCESS IN

POWER
SUPPL Y

Figure 1: Block Diagram

Audio Processor 4 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

2 Signal List

Pin Signal Description

1

Xtal

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 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.

4 Command Data 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

Select Chip . 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 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.

9V

BIAS

The output of the on-chip analog circuitry bias system, held internally at VDD/2.
This pin should be decoupled to V

SS

by capacitor C10. See Figure 2.

10 Mic In (+) 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.

11 Mic In (-) The inverting input to the microphone Op-Amp. This input requires external

components for Op-Amp gain/attenuation setting as shown in Figure 2.

12 V

SS

Negative Supply (GND)

13 Mic Out 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 V

SS

.)

14 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 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.

17 Main Process Out 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.

Audio Processor 5 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Pin Signal Description

18 Sum In
19 Sum Out

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.

20 Modulation In The final, composite modulating signal to VCO (Mod 1) and Reference (Mod 2)

Output Drives

21 Audio Output 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 V

SS

.

22 Modulation 1 Drive The drive to the radio modulator Voltage Controlled Oscillator (VCO) from the

composite audio summing stage.

23 Modulation 2 Drive 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 V

SS

.

24 V

DD

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

Audio Processor 6 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

3 External Components

1
2
3
4
5
6
7
8

9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

MX806AJ

XTAL

XTAL/CLOCK

SERIAL CLOCK

COMMAND DA TA

CHIP SELECT

VOGAD OUT

RX AUDIO IN

VOGAD IN

MIC. IN (+)

MIC. IN (-)

V

BIAS

V

V

V

V

V

V

SS

SS

BIAS

DD

DD

DD

MODULATION 2 DRIVE
MODULATION 1 DRIVE
AUDIO OUT
MOD. IN
MIX OUT
MIX IN

CALIBRATION IN
EXTERNAL AUDIO PROCESS
PROCESSED AUDIO IN
MIC. OUT

MAIN PROCESS
OUT

EXTERNAL SIGNAL

AND

DATA INPUTS

SEE INSET 2

SEE INSET 1

C11

C13

C14

R8

R7

R9

R10

R11

R6

C12

R5

R12

R13

C8

C10

C9

MIC. OUT

C5

R4

C4

+

-

C2

R2

C1

R1

MIC. IN (+)

MIC. IN (-)

R3

C3

MX806AJ

MX806AJ

10

11

13

INSET 2

INSET 1

1

2

XTAL

XTAL/CLOCK

X1

C7

C6

Figure 2: Recommended External Components

Component Notes Value Tolerance Component Notes Value Tolerance

R1

10k



±10% C2

.47F

±20%

R2

10k



±10% C3 270pF ±20%

R3

20k



±10% C4 270pF ±20%

R4

20k



±10% C5

0.1F

±20%

R5

10k



±10% C6 33pF ±20%

R6

2.2M



±10% C7 5-65pF ±20%

R7

100k



±10% C8

1.0F

±20%

R8

100k



±10% C9

1.0F

±20%

R9

100k



±10% C10

1.0F

±20%

R10

100k



±10% C11 22pF ±20%

R11

100k



±10% C12

0.1F

±20%

R12

2.2M



±10% C13

0.01F

±20%

R13

470k



±10% C14

0.01F

±20%

C1

.47F

±20% X1 4.00MHz

Table 2: Recommended External Components

Audio Processor 7 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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 (V

DD

).

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.

Audio Processor 8 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

ä

-

+

MIC. IN

MIC. IN

MIC. OUT

VOGAD

(Voltage Controlled)

AMPLIFIER

TX INPUT PROCESS

MAIN PROCESS

RX

DRIVE

TX

TX

DRIVES

VOGAD

IN

VOGAD

OUT

EXTERNAL INTEGRATION COMPONENTS

HI - LO PEAK

DETECTOR

HI PEAK

DETECTOR

CAL

INPUT

V

V

DD

SS

R5

R6

R12

C8

To EXTERNAL AUDIO PROCESSES

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

2

C8 x R6

)(T TimeDecay

C8 x R5 )(T Time Attack

Then

R5 R12 R6 and 1.0k R5 Provided

D

A







4.3 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 1440mV

P-P

(100% deviation).

2. With Process Gain Amp set as 1 and with Mic. In = 25mV

RMS

at 1kHz, set the Input Level Amp for an

output level of 308mV

RMS

(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 154mV

RMS

and 308mV

RMS

(See Section 7) at 1kHz, set the Input

Level Amp for and output level of 308mV

RMS

.

Audio Processor 9 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

RADIO

AND

CLUSTER

MICRO-

CONTROLLER

EXTERNAL DATA

PROM

DRAM

"C-BUS" SERIAL DATA SYSTEM

MX809

MX805A

MX803A

MX802

MX806A

Transmitter

MOD

VCO

REF.

L

MSK

MODEM

SUB-AUDIO

SIGNALING

PROCESSOR

AUDIO

SIGNALING

PROCESSOR

DAT A/VOICE

STORE AND

RETRIEVE

CODEC

RECEIVE

AND

TRANSMIT

AUDIO

PROCESSOR

AUDIO

Receiver

DEMOD

TX TONE AUDIO SIGNALS AND CUE

1200 BA UD MSK SIGNALS

TX SUB-AUDIO SIGNALS

RX (AUDIO, MSK, TONE, SUB-AUDIO) SIGNALS

4.032MHz XT AL

XTAL

XTAL XTAL

Figure 4 - MX806A Interfaced with Other DBS800 Elements

Figure 4: MX806A Interfaced with Other DBS 800 Elements

Audio Processor 10 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

➤

➤

➤

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 Command Data Table

HEX

MSB 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

Audio Processor 11 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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:

Control Address Command Loaded as 00

H

Mode Address Command Loaded as 00

H

Volume Set Loaded as 00

H

5.1.1 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

3210 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

Audio Processor 12 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

5.1.2 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

Audio Processor 13 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

5.1.3 Modulator Levels – (Preceded by A/C 12H)

Setting Modulator Drives

Byte 1 First byte for transmission

MSB

765

0 0 0 Must be “0”

43210 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

Audio Processor 14 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Setting Modulator Drives

Byte 0 Last byte for transmission

MSB

765

0 0 0 Must be “0”

43210 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

Audio Processor 15 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

5.1.4 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

43210 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 V

SS

.

3. Modulator Drives are controlled separately, but the whole two-byte modulator Drive command must be
loaded for each requirement adjustment.

4.

Select Chip must be held at a logic “1” for the period “t

CSOFF

” between transactions.

Audio Processor 16 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

6 Application Notes

To assist in rapid setting, this quick-reference list should be used with Figure 5.

Control A/C = 10

H

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 = 11

H

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 = 12

H

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 = 13

H

7-6 “0”

5 Powersave

4-0 Volume Set Attenuation (0 to 48dB)

Table 8: Quick Reference List

GENERAL RESET

MSB LSB

Sets the Control, Mode and Volume Commands to 00

H

7

6

5

4

3

21

0

MSB LSB

CONTROL COMMAND 1 DAT A BYTE

MSB LSB

MODE COMMAND 1 DATA BYTE

MSB LSB

VOLUME SET 1 DATA BYTE

MSB LSB

MODULAT OR LEVELS SET

2 DATA BYTES - BYTE 1 (loaded first) BYTE 0 (loaded last)

TABLE 4

TABLE 5

TABLE 3

TABLE 2

7

6

5

4

3

21

0

7

6

5

4

3

21

0

7

6

5

4

3

21

0

7

6

5

4321

0

Figure 6: Examples of Command Data Configurations

Audio Processor 17 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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 Notes Min. Typ. Max. Units

Supply (VDD-VSS) -0.3 7.0 V
Voltage on any pin to V

SS

-0.3 VDD + 0.3 V

Current

V

DD

-30 30 mA

V

SS

-30 30 mA

Any other pin -20 20 mA

P / DW / LH Packages

Total allowable Power dissipation
at T

AMB

= 25C

800 mW

Derating above 25C

10

mW/C above 25C

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 Min. Typ. Max. Units

Supply (VDD-VSS) 4.5 5.0 5.5 V
Operating Temperature -40 85



C

Xtal Frequency 4.0 MHz

Table 10: Operating Limits

Audio Processor 18 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

7.1.3 Operating Characteristics

For the following conditions unless otherwise specified.
V

DD

= 5.0V @ T

AMB

= 25C

Xtal/Clock Frequency = 4.0MHz, Audio Level 0dB ref. = 308mV

RMS

@ 1kHz (60% deviation, FM)

Notes Min. Typ. Max. Units

Static Values

Supply Current

All Elements Enabled 8.0 15.0 mA
Maximum Powersave 0.7 1.5 mA

“C-BUS” Interface

Input Logic “1” 3.5 V
Input Logic “0” 1.5 V
Input Current -1.0 1.0



A

Input Capacitance 7.5 pF

Overall Performance

Microphone Input Level 1, 2 25 mV

RMS

Discriminator Input Level 2, 3 154 308 mV

RMS

Output Drive Level

60% Deviation 2, 4 291 308 326 mV

RMS

100% Deviation 2, 4, 5 1440 MV

P-P

Passband 6 297 3000 Hz
Passband Ripple 7 -2 0.5 dB
Stopband Attenuation 6, 8

@ 150Hz 10 12 dB
@ 3400Hz 2 dB
@ 6000Hz 30 36 dB
@ 8000Hz to 20,000Hz 60 dB

Signal Path Noise

TX -50 dBp
TX 9 -45 dB
RX -60 dB
RX 9 -55 dB

Total Harmonic Distortion

RX or TX, 60% Deviation 1.0 %

Circuit Elements – Figure 5

Mic. Amp or Mod. Summation Amp

Open Loop Gain 50.0 dB
Bandwidth 20.0 kHz
Input Impedance 10.0

M



Output Impedance

Open Loop 6.0

k



Closed Loop 600



De-emphasis

Slope -6.0 dB/octave
Gain 0 dB
Input Impedance 1

M



Audio Processor 19 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Notes Min. Typ. Max. Units

Voltage Controlled Gain Amp (VOGAD)

Gain

Non-Compression 2 6.0 dB
Full-Compression -24 dB

Input Impedance 10.0

M



VOGAD Peak Detectors

Output Impedance

Logic “1” (Compress) 1

k



Logic “0” 10

M



Hi/Lo Peak Detector Threshold 10 1300 mV

P-P

Hi Peak Detector Threshold 10 650 mV + ve pk

Input (Low + Highpass) Filter

Gain @ 1.0kHz -1.0 1.0 dB

Input Level Amp

Gain Range 0 dB
Overall Tolerance -1.0 1.0 dB
Step Size 0.75 1.0 1.25 dB

External Audio Buffer

Gain -0.1 0 0.1 dB

Pre-emphasis (Main Process and VOGAD)

Slope 6.0 dB/octave
Gain @ 1.0kHz 10.0 dB

Process Highpass Filter

Gain @ 1.0kHz -0.1 0 0.1 dB

Deviation Limiter

Threshold 708 1300 1413 mV

RMS

Gain -0.5 0.5 dB

Process Lowpass Filter

Gain @ 1.0kHz -0.1 0 0.1 dB

Process Gain Amp

Gain Range -4.0 3.0 dB
Overall Tolerance -0.5 0.5 dB
Step Size 0.75 1.0 1.25 dB
Output Impedance 600



Transmitter Modulator Drives

Input Impedance 15.0

k



Mod. 1 Attenuator

Attenuation Range 0 12.4 dB
Overall Tolerance -1 1 dB
Step Size 0.2 0.4 0.6 dB
Output Impedance 600



Mod. 2 Attenuator

Attenuation Range 0 6.2 dB
Overall Tolerance -0.5 0.5 dB
Step Size 0.1 0.2 0.3 dB
Output Impedance 600



Audio Processor 20 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Notes Min. Typ. Max. Units

Audio Output Attenuator

Attenuation Range 0 48.0 dB
Overall Tolerance -1.0 1.0 dB
Step Size 1.1 1.6 2.1 dB
Output Impedance 600



Miscellaneous Impedances

Processed Audio Input 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.

Audio Processor 21 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

7.1.4 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 Min. Typ. Max. Units

t

CSE

Chip Select Low to First Serial Clock Rising Edge 2.0



s

t

CHS

Last Serial Clock Rising Edge to Chip Select High 4.0



s

t

CSOFF

Chip Select High time between transactions 2.0



s

t

NXT

Inter-Byte Time 4.0



s

t

CK

Serial Clock Period 2.0



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.

CHIP SELECT

SERIAL CLOCK

COMMAND DATA

ADDRESS/COMMAND

BYTE

LAST DATA BYTE

Logic level is not important

MSB LSB

t

t

CSOFF

t

CSH

t

NXT

t

NXT

CK

t

CSE

FIRST DATA BYTE

5432 0617543206175432 0617

Figure 7: C-BUS Timing Information

Audio Processor 22 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

7.2 Packages

NOTE: All dimensions in inches (mm.)

Angles are in degrees

PackageTolerances

A
B
C
E

E1

H

TYP. MAX.MIN.DIM.

J

J1

P
Y

T

K

L

0.220 (5.59)

0.555 (14.04)

0.670 (17.02)

7°

0.160 (4.05)

1.270 (32.26)

0.151 (3.84)

0.100 (2.54)

0.121 (3.07)

0.600 (15.24)

0.590 (14.99) 0.625 (15.88)

0.015 (0.38) 0.045 (1.14)

0.008 (0.20) 0.015 (0.38)

0.015 (0.38) 0.023 (0.58)

0.040 (1.02) 0.065 (1.65)

0.066 (1.67) 0.074 (1.88)

1.200 (30.48)

0.500 (12.70)

H

K

L

J1

J1

J

J

P

P

C

C

B

B

A

A

PIN1

PIN1

T

T

E

E

E1

E1

Y

Figure 8: 24-pin PDIP Mechanical Outline:

Order as part no. MX806AP

0.597 (15.16)

PackageTolerances

A
B

C

E
H

TYP. MAX.MIN.DIM.

J

P

X

W

T

Y

K

L

0.105 (2.67)

0.093 (2.36)

0.419 (10.64)

45°

7°

0°

10°

0.050 (1.27)

0.046 (1.17)

0.613 (15.57)

0.299 (7.59)

0.050 (1.27)

0.016 (0.41)

0.390 (9.90)

0.020 (0.51)0.003 (0.08)

0.009 (0.23)

0.0125 (0.32)

0.013 (0.33)

0.020 (0.51)

0.036 (0.91)

0.286 (7.26)

Z

NOTE: All dimensions in inches (mm.)

Angles are in degrees

5°

5°

PIN 1

A

B

X

P

J

Y

C

H

K

E

L

T

W

Z

Alternative Pin

Location
Marking

Figure 9: 24-pin SOIC Mechanical Outline:

Order as part no. MX806ADW

Audio Processor 23 MX806A

1998 MX-COM, Inc. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. # 20480064.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

PackageTolerances

NOTE: All dimensions in inches (mm.)

Angles are in degrees

A

B
C
D

E

H

P

F
G

TYP. MAX.MIN.DIM.

K

J

W

T

Y

0.435 (11.05)

0.435 (11.05)

0.051 (1.30)

0.009 (0.22)

6°

30°

0.409 (10.40)

0.409 (10.40)

0.146 (3.70)

0.417 (10.60)

0.417 (10.60)

0.049 (1.24)

0.006 (0.152)

0.250 (6.35)

0.250 (6.35)

0.023 (0.58)

0.047 (1.19)

0.022 (0.55)0.018 (0.45)

0.380 (9.61)

0.380 (9.61)

0.128 (3.25)

0.048 (1.22)

45°

F

G

P

A

D

B

E

PIN 1

W

C

J

K

Y

W

H

T

Figure 10: 24-pin PLCC Mechanical Outline:

Order as part no. MX806ALH