ETC MX826J

DATA BULLETIN
AMPS/NAMPS SYSTEM
AUDIO PROCESSOR
MX826
PRELIMINARY INFORMATION
Features
• Full-Duplex Audio Processing for AMPS/
NAMPS Cellular Systems
• On-Chip Speech and SAT Capabilities
– TX/RX Filtering & Gain – SAT Channel
Pre-/De-Emphasis – Deviation Limiter
• Serial µProcessor Interface
• “Sidetone” Output Available
• Access to External Processes
– Companding – Signaling –
VSR Codec (Store/Play)
• HandsFree Compatibility
• Powersave (Low-Current) Settings
MX826DW
28-pin SOIC
MX826J
28-pin CDIP
Figure1 - The MX826 AMPS/NAMPS Audio Processor Installed in a Cellular System
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
Description
The MX826 is a µProcessor controlled full-duplex
audio processor on a single-chip with separate TX and
RX paths to provide all the filter/gain/limiting functions
necessary to pre-process audio, wideband-data and SAT
cellular communications systems using the AMPS/NAMPS
or TACS/ETACS/JTACS specifications.
Selectable inputs available to the transmit path are: a
choice of two microphones and DTMF/signaling, with
access, in this path, to external compression circuitry.
Operationally the TX path provides input gain/filtering, a
deviation limiter and TX Modulation Drive controls.
In the RX path the SAT signal is separated from the
incoming audio via a filter block and made available at a
separate pin for mixing externally with the TX Modulation
Drive.
The RX path consists of an input gain/filter block for
Pin
voice, inputs from an external audio expansion system
and an output gain control driving either a loudspeaker
system or earpiece.
Unique to the MX816/826/836 cellular audio
processors is the ability to route audio (TX or RX) to an
external Voice Store and Retrieve (VSR) device such as
the MX802 or MX812 thus providing the radio system with
a voice answering and announcement facility using
external DRAM.
As a member of the DBS800 family, the MX826
follows C-BUS protocol. (C-BUS is the serial interface
used by all DBS800 integrated circuits.)
The MX826, a low-power CMOS device which reduces
the amount of microcircuits and components required in
a cellular audio system by providing more functions on a
single chip, is available in 28-pin SOIC and CDIP packages.
Function
1
Xtal: The output of the on-chip clock oscillator.
2
Xtal/Clock: The input to the on-chip clock oscillator. A Xtal or externally derived clock (fXTAL) should be
connected here. Note that operation of the MX826 without a suitable Xtal or clock input may cause device
damage. See Figure 2 (notes).
3
Serial Clock: The “C-BUS” serial data clock input. This clock, produced by the µController, is used for
transfer timing of commands and data to the MX826. See Timing Diagrams.
4
Command Data: The “C-BUS” serial data input from the µController. Data is loaded to the MX826 in 8bit bytes, MSB (B7) first, and LSB (B0) last, synchronized to the Serial Clock. See Timing Diagrams.
5
Chip Select (CS): The “C-BUS” data loading control function. This input is provided by the µController.
Data transfer sequences are initiated, completed or aborted by this signal. See Timing Diagrams.
6
VBIAS: The internal circuitry bias line, held at VDD/2 this pin must be decoupled to VSS. See Figure 2.
7
Rx Audio In: Normally taken from the radio's discriminator output, this input has a 1MΩ internal resistor
to VBIAS and requires to be connected via a capacitor.
8
Expand/Store: A common output that can be used as either an input to an external audio expander or
the input to a voice storage medium such as the MX812. Components relevant to the external device
requirements should be used at this output. See Figures 2 and 3.
9
(Expanded) Audio In: The audio input, via SW5, from an external expander or audio mixing function. This
input has a 1MΩ internal resistor to VBIAS and requires to be connected via a capacitor. See Figures 2 and
3.
10
TX Mod Out: The composite TX audio output to the transmitter modulator from a variable attenuation
stage (11H). This output is set to VBIAS via an internal 1MΩ resistor when set to Powersave or OFF.
11
LS Audio Out: An audio output of the Rx path (or selected audios, see Figure 3) for a loudspeaker system.
This is available for handsfree operation. This output can be connected to VBIAS when not required, by SW6
(Configuration Command (10H)). A driver amplifier may be required.
Notes on Inputs:To minimize aliasing effects, lowpass filtering may be required at the inputs to this device
(especially those supplied from switched-capacitor-type devices) to ensure the input spectrum is kept
below 63kHz.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
Pin
MX826 Preliminary Information
Function
12
Ear Audio Out: An audio output of the Rx path (or selected audios), available as an output for a handset
earpiece. This output, in parallel with the LS Audio Out function, can be connected to VBIAS when not
required, by SW7 (Configuration Command (10H)). A driver amplifier may be required.
13
Sidetone: A switched “sidetone” from the microphone inputs made available for mixing externally with
the “Ear” audio. See Figure 3.
14
VSS: Negative supply rail. Signal ground.
15
TX Mix: The output of the TX Mix Amplifier. Used with external components, it allows the TX Filter
Out output to mix with externally generated signalling tones prior to the final level adjustment.
16
SAT Out: The output of the SAT Bandpass filter. This level is recovered from the input RX audio and
is available for mixing externally with the transmitter modulation. See Figure 3.
17
TX Mix In: The input to the TX Mix Amplifier. Used with external components, it allows the TX Filter
Out output to mix with externally generated signalling tones prior to the final level adjustment. The
recovered SAT signal may be introduced at this point. See Figures 2 and 3.
18
TX Filter Out: The output of the Deviation Limiter/Lowpass Filter stage. This stage can be by-passed
using SW3 (Configuration Command). See Figure 3.
19
No internal connection – Leave open circuit.
20
Deviation Limiter In: Input to the on-chip deviation limiter. This input should be a.c. coupled to the
Pre-Emphasis Out pin. The a.c. coupling will achieve maximum possible symmetry of limiting as this
input has a 1MΩ internal resistor to VBIAS. See Figure 2.
21
Pre-Emphasis Out: Audio output from the TX Gain/Pre-Emphasis function. This output should be
a.c. coupled to the Deviation Limiter In pin. See Figures 2 & 3.
22
DTMF In: To introduce DTMF type audio, at a suitable level for transmission, to the TX Path,
controlled by SW2 (Configuration Command (10H)). This input has an internal 1MΩ resistor to V BIAS
and should be connected via a capacitor.
23
Compression In: The audio input from an external compression system. This input has an internal
1MΩ resistor to VBIAS and should be connected via a capacitor.
24
Compression: The output to an external audio compression system. Currently available compressor/
expanders have Op-Amps incorporated. The compressor can be by-passed by SW2.
25
Mic.2 In:
26
Mic.1 In:
27
Play In: The input via SW2 from a voice storage device such as the MX812. This “replayed” audio
can be sent to RX or TX paths allowing a Messaging/Voice Notepad/Answering facility. This input has
an internal 1MΩ resistor to VBIAS and should be connected via a capacitor.
28
VDD: Positive supply rail. A single +5-volt power supply is required. Levels and voltages within this
Audio Processor are dependent upon this supply.
TX voice (Mic.) inputs, selectable by SW1 available for handsfree mic./handset mic. or
any TX audio input. Pre-amplification may be required at these inputs. These inputs
each have an internal 1MΩ resistor to VBIAS and should be connected via a capacitor.
C-BUS is MX-COM’s proprietary standard for the transmission of commands and data between a
µController and the relevant Cellular microcircuits. It may be used with any µController, and can, if
desired, take advantage of the hardware serial I/O functions embodied into many types ofµController.
The “C-BUS” data rate is determined solely by the µController.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
Application Information
VDD
X1
C11
C9
XTAL
1
28
VDD
XTAL/CLOCK
2
27
PLAY IN
3
4
26
25
MIC.1 IN
C1
MIC.2 IN
C2
SERIAL CLOCK
COMMAND DATA
CHIP SELECT
VBIAS
C
4
RX AUDIO IN
EXPAND/STORE
C8
(EXPANDED) AUDIO IN
C12
TX MOD OUT
LS AUDIO OUT
EAR AUDIO OUT
SIDETONE OUT
VSS
24
23
5
6
7
8
9
MX826J
C3
C10
COMPRESS
(COMPRESSED) AUDIO IN
22
21
20
DTMF IN
C5
C6
PRE-EMP OUT
C
DEV LIM IN
10
11
19
18
12
13
17
16
TX MIX IN
14
15
TX MIX
TX FILTER OUT
SAT OUT
C13
7
R1
C14
R2
R3
C15
C16
Signaling and
Wideband Data
R4
R1
R2
R3
R4
C1
C2
=
100kΩ
as required
100kΩ
as required
100nF
100nF
Tolerances –
C3
C4
C5
C6
C7
=
100nF
100nF
100nF
100nF
100nF
C8
C9
C10
C11
C12
=
100nF
33pF
100nF
33pF
1.0µF
C13
C14
C15
C16
X1
=
100nF
100nF
100pF
100nF
4.000MHz
Capacitors ±20%
Figure 2 - Recommended External Components
Notes
1.
Xtal/clock operation
Operation of any MX-COM IC without a Xtal or
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).
2.
SAT Output
It is possible, due to the impedance of this output,
that an external buffer amplifier will be required
when interfacing or mixing with other cellular system
sections.
3.
TX Mix Gain
The value of R4 should be chosen with R3/C15 in
order to provide the required gain.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
MX812
XTAL/CLOCK
COMPONENTS
(SEE FIGURE 2)
C-BUS
CONTROL
INPUTS
CLOCK
STORE AUDIO
RX Path
RX AUDIO IN
XTAL GENERATOR
XTAL/CLOCK
CHIP SELECT
COMMAND DATA
SERIAL CLOCK
DTMF IN
SW1
HPF
COMP.
BYPASS
RX GAIN ELEMENT
RX GAIN DE-EMP
#
HPF
SERIAL
C-BUS
INTERFACE
and
LOGIC
LPF
COMPRESSION
SW2
SAT
BPF
ALARM
DTMF
SW4
EXPANDER
LPF
SAT
dB
VOLUME
SIDETONE
BYPASS
(EXPANDED)
AUDIO IN
SW5
MIXING
NETWORK
EXPAND/STORE
LPF
TX AUDIO/PLAY/STORE
SIDETONE
TX GAIN PRE-EMP
DEV LIMITER
PRE-EMP.
DEV.
LIMITER IN
OUT
TX GAIN ELEMENT
COMPRESSION IN
SIGNALING and
WIDEBAND DATA IN
SW3
TX FILTER
OUT
Figure 3 - The MX826 Internal and External Signal Paths within a AMPS/NAMPS Cellular Radio System
FROM
DEMODULATOR
(OPTIONAL
VSR CODEC)
PLAY IN
MIC.2 IN
MIC.1 IN
TX Path
COMPRESSOR
AMPS/NAMPS Cellular System Interfaces
TX MIX
+
-
TX MIX AMP
BIAS
#
BIAS
SW6
AUDIO
SELECT
SW7
SIDETONE
ENABLE
SW8
BIAS
BIAS
TX MIX
IN
SAT OUT
VBIAS
SIDETONE OUT
VDD
LS AUDIO OUT
VSS
EAR AUDIO OUT
dB
TX MOD OUT
MOD LEVEL
EARPIECE
TO
MODULATOR
HANDSFREE
LOUDSPEAKER
MIXING
NETWORK
Mixing SAT, TX Signal & Signaling
prior to final drive adjustment...
Note that SAT & TX Mod Out may
be mixed prior to modulation.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
The Controlling System: C-BUS Hardware Interface
C-BUS is MX-COM's proprietary standard for the transmission of commands and data between a µController and MXCOM's New Generation integrated circuits. C-BUS has been designed for a low IC pin-count, flexibility in handling variable
amounts of data, and simplicity of system design and µController software.
It may be used with any µController, and can, if desired, take advantage of the hardware serial I/O functions built into
many types of µController. Because of this flexibility and because the BUS data-rate is determined solely by the
µController, the system designer has complete freedom to choose a µController appropriate to the overall system
processing requirements.
Control of the functions and levels within the MX826 is by a group of Address/Commands and appended data
instructions from the system µController to set/adjust the functions and elements of the device. The use of these
instructions is detailed in the following paragraphs and tables.
Command
Assignment
Address/Command (A/C) Byte
Hex
Binary
MSB
Command
Data
Table
LSB
General Reset
Configuration Command
TX Gain & Mod. Command
RX Gain & Vol. Command
01
10
11
12
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
+
+
+
1 byte
1 byte
1 byte
2
3
4
Powersave Command
13
0
0
0
1
0
0
1
1
+
1 byte
5
Table 1 “C-Bus” Address/Commands
In C-BUS protocol the audio processor is allocated
Address/Command (A/C) values 10H to 13H. Configuration, TX/
RX Gains, Powersave assignments and data requirements are
given in Table 1. Each instruction consists of an Address/
Command (A/C) byte followed by a data instruction formulated
from the following tables.
Commands and Data are only to be loaded in the group
configurations detailed, as 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 Tables 2, 3,
4 and 5, is acted upon at the end of the loaded instruction. See
Timing Diagrams, Figures 5 and 6.
Upon Power-Up the value of the “bits” in this device will be
random (either “0” or “1”). A General Reset Command (01H)
will be required to set all MX826 registers to 00H.
Configuration Command
TX Gain & Mod. Command (Preceded by A/C 11H)
Setting
1
0
0
1
1
(Preceded by A/C 10H)
Control Bits
MSB
Bit 7
0
1
Transmitted First
Sw8 Sidetone
Sidetone Bias
Sidetone Enabled
6
0
1
Sw6/7 RX Audio
Ear Enabled, LS Bias
LS Enabled, Ear Bias
5
0
1
Sw5 Expandor
Expander By-Pass
Expander Route
4
0
1
Sw4 TX/RX Audio
Tx Store/Audio
Rx Store/Audio
3
0
1
Sw3 Dev. Limiter
Dev. Limiter Bypass
Dev. Limiter Route
2
0
1
Sw1 Mic. Inputs
Mic. 1 Input
Mic.2 Input
0
0
1
0
1
Sw2 TX Function
DTMF In
Compressor Bypass
Compressor In
Play In
Table 2 Configuration Commands
Setting
MSB
7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Gain (dBs)
6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Transmitted First
Tx Mod. Level
OFF (Low Z to V BIAS )
-5.6
-5.2
-4.8
-4.4
-4.0
-3.6
-3.2
-2.8
-2.4
-2.0
-1.6
-1.2
-0.8
-0.4
0
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
TX Input Gain
-2.65
-2.05
-1.50
-0.95
-0.45
0
0.45
0.85
1.25
1.65
2.05
2.40
2.70
3.05
3.35
3.65
Table 3 TX Gain & Mod. Commands
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
The Controlling System ......
RX Gain & Vol. Command (Preceded by A/C 12H)
Setting
MSB
7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Powersave Command
Gain (dBs)
6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Transmitted First
RX Volume
OFF (Low Z to V BIAS )
-28.0
-26.0
-24.0
-22.0
-20.0
-18.0
-16.0
-14.0
-12.0
-10.0
-8.0
-6.0
-4.0
-2.0
0
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RX Input Gain
3.75
4.30
4.80
5.30
5.80
6.20
6.55
7.05
7.40
7.80
8.15
8.50
8.80
9.10
9.40
9.70
Setting
MSB
Bit 7
7 6
0 0
(Preceded by A/C 13H)
Control Bits
Transmitted First
5
0
4
0
3
0
2
0
1
0
All must be a logic “0”
0
0
1
Powersave Setting
Powersave MX826
Enable MX826
Table 5 - Powersave Command
Table 4 - RX Gain and Vol. Commands
Reference Signal Levels
%
(rms)
mV
kHz
100
513
9.5
411
7.6
100%
9.5kHz
513mV
90
DEVIATION (+/-)
80
67.4%
6.4kHz
70
60
346mV
308
5.7
205
3.8
60.0%
5.7kHz
308mV
50
40
37.1%
3.52kHz
190mV
24.2%
2.3kHz
30
20
125mV
103
17.9%
1.7kHz
12.6%
1.2kHz
92mV
1.9
65mV
10
Maximum
Deviation
1.0kHz
Tone
SAT Tone
5970kHz
6000kHz
6030kHz
Signaling
Tone
10kHz
and WBD
DTMF
Normal
Test
Modulation
Min.
697Hz
Max.
1633Hz
Figure 4 - Signal Deviation Levels and corresponding TX Mod Outputs with the Mod Level set to 0dB
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
Control Timing Information
Characteristics
tCSE
tCSH
tCSOFF
tCK
tNXT
tCH
tCL
tCDS
tCDH
See Note
Min.
Typ.
Max.
Unit
1
1
1, 2
1
1
2.0
4.0
2.0
2.0
4.0
500
500
250
0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
µs
µs
µs
µs
µs
ns
ns
ns
ns
“CS-Enable to Clock-High”
Last “Clock-High to CS-High”
“CS-High” Time between transactions
“Clock-Cycle” Time
“Inter-Byte” Time
“Serial Clock-High” Period
“Serial Clock-Low” Period
“Command Data Set-Up” Time
“Command Data Hold” Time
Notes
1. These Minimum Timing values are altered during operation of the MX812 VSR Codec.
2. Chip Select must be taken to a logic “1” between each individual transaction.
➤
➤
➤
➤
➤
➤
➤
➤
➤
➤
Figure 5 - Control Timing Information
➤
➤
➤
➤
➤
➤
➤
➤
➤
➤
Figure 6 - Control Timing Relationships
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
Frequency Responses
10
0
dB
-10
-20
-30
-40
50
100
300
3000
1000
10000
Frequency (Hz)
Figure 7 - Microphone Input Stages -Combined Low and Highpass Filter Frequency Response
Figure 7
Mic.1/2 In to Compression Out
10
0
VDD
dB
-10
=
5.0V
Signal Input Level =
55.0mVrms
-20
-30
Figure 8
Dev Limiter In to TX Filter Out
-40
-50
3000
2000
4000
10000
6000
Frequency (Hz)
VDD
=
5.0V
Signal Input Level =
55.0mVrms
Figure 8 - Post Deviation Limiter Lowpass Filter Response
20
10
Figure 9
VDD
=
Signal Input Level =
dB
0
RX Audio In to SAT out
-10
5.0V
-20
100mVrms
-30
-40
-50
3000
6000
10000
Frequency (Hz)
Figure 9 - RX SAT Path Bandpass Filter Response
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
Specifications
Absolute Maximum Ratings
Operating Limits
Exceeding the maximum rating can result in device
damage. Operation of the device outside the operating
limits is not suggested.
All devices were measured under the following
conditions unless otherwise noted.
Supply Voltage
Input Voltage at any pin
(Ref VSS = 0V)
Sink/source Current
(Supply pins)
(Other pins)
Total Device Dissipation
@TAMB 25°C
Derating
Operating Temperature
Storage Temperature
VDD = 5.0V
-0.3 to 7.0 V
-0.3V to (VDD + 0.3V)
TAMB = 25°C
Xtal/clock fXTAL = 4.0MHz
±30mA
±20mA
Audio level 0dB ref. = 308mVrms @ 1kHz
800mW max.
10mW/°C
-40°C to +85°C
-55°C to +125°C
Characteristics
See Note
Min.
Typ.
Max.
Unit
4.5
5.0
5.5
V
–
–
–
6.5
0.5
63.0
–
–
–
mA
mA
kHz
10.0
–
–
–
–
20.0
–
10.0
10.0
10.0
50.0
–
–
–
–
–
–
–
MΩ
kΩ
V/V
MHz
dB
kHz
Analog Input Impedances
Mic.1 & 2
Play
Comp In
DTMF In
Dev. Limiter In
(Expanded) Audio In
TX Mix In
RX Audio In
–
–
–
–
–
–
10.0
–
500
500
500
500
100
47.0
–
100
–
–
–
–
–
–
–
–
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
MΩ
kΩ
Analog Output Impedances
Pre-Emp Out
TX Mod Out
Expand/Store
LS and Ear Audio
SAT Out
TX Filter Out
Comp Out
Sidetone Out
TX Mix (Open Loop)
(Closed Loop)
Switches – ON
– OFF
–
–
–
–
–
–
–
–
–
–
–
10.0
600
600
600
1.0
1.0
600
600
2.0
6.0
600
1.0
–
–
–
–
–
–
–
–
–
–
–
–
–
Ω
Ω
Ω
kΩ
kΩ
Ω
Ω
kΩ
kΩ
Ω
kΩ
MΩ
Static Values
Supply Voltage
Supply Current
Operating
Powersave
Alias Frequency
On-Chip Xtal Oscillator
RIN
ROUT
Inverter d.c. Voltage Gain
Gain/Bandwidth Product
TX Mix Amp
(Open Loop Gain)
(Bandwidth)
3
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
Characteristics
MX826 Preliminary Information
See Note
Min.
Typ.
Max.
Unit
1
1
1
1
3.5
–
-1.0
–
–
–
–
–
–
1.5
1.0
7.5
V
V
µA
pF
300
+24.0
-24.0
–
–
3000
–
–
Hz
dB/oct.
dB/oct.
–
–
0
6.0
–
–
dB
dB/oct.
-
40 log(f/3000)
35.0
40 log(f/3000)
28.0
-
dB
dB
dB
dB
2
2
2
2
2
–
–
–
–
–
0
0
0
0
0
–
–
–
–
–
dB
dB
dB
dB
dB
2
2
2
2
–
–
–
–
0
0
0
0
–
–
–
–
dB
dB
dB
dB
-2.65
-0.2
–
–
3.65
0.2
dB
dB
–
–
1086
7.0
–
–
mVp-p
%
-5.6
0.2
-1.0
0.4
–
0
0.6
1.0
dB
dB
dB
–
–
-40.0
-40.0
-32.0
-20.0
dBp
dB
–
–
300
+24.0
-36.0
3.75
-6.0
–
–
3000
–
–
dB
dB/oct.
Hz
dB/oct.
dB/oct.
Control Interface Parameters
Input Logic Levels
Logic “1”
Logic “0”
IIN (logic “1” or “0”)
Input Capacitance
Channel Performances
TX Path
Filter Specifications
Pre-Compression L/HPF Combination
Passband
Slope - below 300Hz
above 3000Hz
TX Gain Pre-Emphasis
Gain at 1.0kHz
Slope (300Hz - 3000Hz)
Post Deviation Limiter LPF
Attenuation Relative to 1.0kHz
3.0kHz - 5.9kHz
5.9kHz - 6.1kHz
6.1kHz - 15kHz
>15kHz
Analog Signal Input Levels
Mic. 1 and 2
Play
DTMF
Comp. In
TX Mix In
Analog Signal Output Levels
Pre-Emp Out
TX Filter Out
TX Mod Out
Sidetone Out
Path Gains/Levels
TX Gain – 11H
Nominal Adjustment Range
Error of any Setting
Dev Limiter
Threshold
Symmetry
Mod Level Attenuation – 11 H
Nominal Adjustment Range
Step Size
Error of any Setting
Overall
TX Distortion
TX Hum and Noise
RX Signal Path
Filter Specifications
RX Gain De-Emphasis
Gain at 1.0kHz
Slope (300Hz - 3000Hz)
RX Channel Bandpass
Slope - below 300Hz
above 3000Hz
–
–
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
Characteristics
RX Signal Path (cont'd)
Analog Signal Levels
RX Audio Input Level
LS/Ear Audio Output Level
Path Gains/Levels
RX Gain – 12H
Nominal Adjustment Range
Error of any Setting
Volume – 12H
Nominal Adjustment Range
Step Size
Error of any Setting
Overall
RX Distortion
RX Hum and Noise
SAT Signal Path
Bandpass Filter
Frequency Range
Gain
MX826 Preliminary Information
See Note
Min.
Typ.
Max.
Unit
2
2
–
–
-7.0
0
–
–
dB
dB
3.75
-0.2
–
9.70
0.2
dB
dB
-28.0
1.5
-1.0
2.0
–
0
2.5
1.0
dB
dB
dB
–
–
-40.0
-40.0
-32.0
-34.0
dBp
dB
5970
19.0
20.0
6030
21.0
Hz
dB
Notes
1. Serial Clock, Command Data and Chip Select inputs.
2. Levels equivalent to ±3.0kHz deviation with the settings below:
TX Gain = 0dB
Mod Level = 0dB
RX Gain = 7.05dB
Volume = 0dB
Other levels can be achieved by adjusting the above variable gain blocks in accordance with
Tables 1 to 5.
3. Recommended load >10.0kΩ.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
Package Outline
Handling Precautions
The MX826 packages available are shown below. Pin 1
is marked with an indent spot. Pins on both package
styles number counter-clockwise when viewed from the
top (marked side).
The MX826 is a CMOS LSI circuit which includes input
protection. However precautions should be taken to
prevent static discharges which may cause damage.
Fig.10 MX826DW 28-pin Small Outline I.C. Package
A
➤
➤
H
D
➤
➤
➤
B
➤
C
➤
➤
➤
➤
➤
➤
F
➤
➤
G
E
➤
➤
➤
Package Tolerances
➤
J
➤
M
➤➤
K
➤
➤
L➤
➤ ➤
➤
➤
N
➤
P
R
➤
➤
Fig.11 MX826J 28-pin Ceramic Dual In-Line Package
A
➤
➤
B
➤ ➤
D
➤ ➤
C
➤➤
E
➤
➤
➤
➤
F
G
➤
➤
H
➤
➤
➤
➤
➤
Package Tolerances
K
➤
➤
➤
➤
J
L
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.