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MX826
Features
DATA BULLETIN AMPS/NAMPS SYSTEM AUDIO PROCESSOR
PRELIMINARY INFORMATION
* 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 Processor 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
(c) 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 Processor 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 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.
Pin
1 2
Function
Xtal: The output of the on-chip clock oscillator. 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). Serial Clock: The "C-BUS" serial data clock input. This clock, produced by the Controller, is used for transfer timing of commands and data to the MX826. See Timing Diagrams. Command Data: The "C-BUS" serial data input from the Controller. Data is loaded to the MX826 in 8bit bytes, MSB (B7) first, and LSB (B0) last, synchronized to the Serial Clock. See Timing Diagrams. Chip Select (CS): The "C-BUS" data loading control function. This input is provided by the Controller. Data transfer sequences are initiated, completed or aborted by this signal. See Timing Diagrams. VBIAS: The internal circuitry bias line, held at VDD/2 this pin must be decoupled to VSS. See Figure 2. Rx Audio In: Normally taken from the radio's discriminator output, this input has a 1M internal resistor to VBIAS and requires to be connected via a capacitor. 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. (Expanded) Audio In: The audio input, via SW5, from an external expander or audio mixing function. This input has a 1M internal resistor to VBIAS and requires to be connected via a capacitor. See Figures 2 and 3. 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 1M resistor when set to Powersave or OFF. 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.
3 4 5 6 7 8
9
10 11
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.
(c) 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
Pin
12
Function
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. Sidetone: A switched "sidetone" from the microphone inputs made available for mixing externally with the "Ear" audio. See Figure 3. VSS: Negative supply rail. Signal ground. 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. 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. 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. 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. No internal connection - Leave open circuit. 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 1M internal resistor to VBIAS. See Figure 2. 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. 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 1M resistor to V BIAS and should be connected via a capacitor. Compression In: The audio input from an external compression system. This input has an internal 1M resistor to VBIAS and should be connected via a capacitor. 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. Mic.2 In: Mic.1 In: 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 1M resistor to VBIAS and should be connected via a capacitor.
13 14 15 16 17
18 19 20
21 22
23 24 25 26 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 1M resistor to VBIAS and should be connected via a capacitor. VDD: Positive supply rail. A single +5-volt power supply is required. Levels and voltages within this Audio Processor are dependent upon this supply.
28
C-BUS is MX-COM's proprietary standard for the transmission of commands and data between a Controller and the relevant Cellular microcircuits. It may be used with any Controller, and can, if desired, take advantage of the hardware serial I/O functions embodied into many types ofController. The "C-BUS" data rate is determined solely by the Controller.
(c) 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
XTAL X1 C11 C9 XTAL/CLOCK SERIAL CLOCK COMMAND DATA CHIP SELECT VBIAS C
4
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23
VDD PLAY IN MIC.1 IN MIC.2 IN C1 C2 C3 C10
COMPRESS (COMPRESSED) AUDIO IN DTMF IN PRE-EMP OUT DEV LIM IN C13 C
7
C5
RX AUDIO IN EXPAND/STORE
MX826J
22 21 20 19 18 17 16 15
C6
C8 C12
(EXPANDED) AUDIO IN TX MOD OUT LS AUDIO OUT EAR AUDIO OUT SIDETONE OUT VSS
TX FILTER OUT TX MIX IN SAT OUT TX MIX
R1
C14
R2
R3 C16 C15
Wideband Data
Signaling and
R4
R1 R2 R3 R4 C1 C2
=
100k as required 100k as required 100nF 100nF
C3 C4 C5 C6 C7
=
100nF 100nF 100nF 100nF 100nF
C8 C9 C10 C11 C12
=
100nF 33pF 100nF 33pF 1.0F
C13 C14 C15 C16 X1
=
100nF 100nF 100pF 100nF 4.000MHz
Tolerances -
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. TX Mix Gain The value of R4 should be chosen with R3/C15 in order to provide the required gain.
3.
(c) 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 Cellular System Interfaces
COMPRESSOR
SIGNALING and WIDEBAND DATA IN
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.
TX Path
TX GAIN ELEMENT
DEV LIMITER MIC.1 IN MIC.2 IN PLAY IN BYPASS SIDETONE SIDETONE SW3 DTMF IN SERIAL CLOCK COMMAND DATA CHIP SELECT
XTAL/CLOCK
CLOCK
COMPRESSION COMPRESSION IN
PRE-EMP. DEV. LIMITER IN OUT
TX FILTER OUT TX MIX IN
TX MIX
TX MIX AMP
MOD LEVEL
LPF
HPF
COMP. BYPASS
-
TX MOD OUT
+
TO MODULATOR
LPF
SW2
BIAS
dB
VDD
SW1
TX GAIN PRE-EMP
MX812
BIAS
SIDETONE OUT VBIAS
SIDETONE ENABLE SW8
(OPTIONAL VSR CODEC)
#
C-BUS CONTROL INPUTS
SERIAL C-BUS INTERFACE and LOGIC
SAT BPF
SAT
SAT OUT SW7 BIAS EAR AUDIO OUT
TX AUDIO/PLAY/STORE RX GAIN DE-EMP
SW5 VOLUME
# AUDIO SELECT
EARPIECE
VSS BIAS
XTAL/CLOCK COMPONENTS (SEE FIGURE 2)
XTAL GENERATOR
MIXING NETWORK
LS AUDIO OUT
FROM DEMODULATOR
RX AUDIO IN
HPF
RX GAIN ELEMENT
SW4 EXPAND/STORE
LPF
(EXPANDED) AUDIO IN
dB
SW6
RX Path
STORE AUDIO
HANDSFREE LOUDSPEAKER
MIXING NETWORK
EXPANDER
DTMF ALARM
(c) 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. MX826 Preliminary Information
Figure 3 - The MX826 Internal and External Signal Paths within a AMPS/NAMPS Cellular Radio System
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 Controller 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 Controller software. It may be used with any Controller, and can, if desired, take advantage of the hardware serial I/O functions built into many types of Controller. Because of this flexibility and because the BUS data-rate is determined solely by the Controller, the system designer has complete freedom to choose a Controller 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 Controller 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
General Reset Configuration Command TX Gain & Mod. Command RX Gain & Vol. Command Powersave Command
Address/Command (A/C) Byte Hex Binary
MSB 01 10 11 12 13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 LSB 1 0 1 0 1
Command Data
Table
+ + + +
1 byte 1 byte 1 byte 1 byte
2 3 4 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
Setting
MSB Bit 7 0 1 6 0 1 5 0 1 4 0 1 3 0 1 2 0 1 1 0 0 1 1 0 0 1 0 1
(Preceded by A/C 10H)
TX Gain & Mod. Command (Preceded by A/C 11H)
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 6 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 2 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 1 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 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Control Bits
Transmitted First Sw8 Sidetone Sidetone Bias Sidetone Enabled
Sw6/7 RX Audio Ear Enabled, LS Bias LS Enabled, Ear Bias Sw5 Expandor Expander By-Pass Expander Route Sw4 TX/RX Audio Tx Store/Audio Rx Store/Audio Sw3 Dev. Limiter Dev. Limiter Bypass Dev. Limiter Route Sw1 Mic. Inputs Mic. 1 Input Mic.2 Input Sw2 TX Function DTMF In Compressor Bypass Compressor In Play In
Gain (dBs)
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
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 2 Configuration Commands
Table 3 TX Gain & Mod. Commands
(c) 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 6 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 2 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 1 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 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Powersave Command
Setting
MSB Bit 7 76 00
(Preceded by A/C 13H)
Gain (dBs)
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
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
Control Bits
Transmitted First
5 0
4 0 0 0 1
3 0
2 0
1 0
All must be a logic "0" Powersave Setting Powersave MX826 Enable MX826
Table 5 - Powersave Command
Table 4 - RX Gain and Vol. Commands
Reference Signal Levels
% 100 90 80 411 7.6 (rms) 513
mV
kHz 9.5
513mV
100% 9.5kHz
DEVIATION (+/-)
70 60 50 40 30 20 10 103 1.9 205 3.8 308 5.7
346mV
67.4% 6.4kHz
308mV
60.0% 5.7kHz
37.1% 3.52kHz
190mV
125mV
24.2% 2.3kHz
17.9% 1.7kHz
92mV
12.6% 1.2kHz
65mV
Maximum
Deviation
1.0kHz
Tone
SAT Tone 5970kHz 6000kHz 6030kHz
Signaling Tone 10kHz
and WBD
Test Modulation
Normal
DTMF Min. 697Hz Max. 1633Hz
Figure 4 - Signal Deviation Levels and corresponding TX Mod Outputs with the Mod Level set to 0dB
(c) 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 "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
See Note
1 1 1, 2 1 1
Min.
2.0 4.0 2.0 2.0 4.0 500 500 250 0
Typ.
- - - - - - - - -
Max.
- - - - - - - - -
Unit
s s s s s ns ns ns ns
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.
(R)
(R)
(R)
(R) (R) (R) (R) (R)
(R)
(R)
Figure 5 - Control Timing Information
(R) (R) (R) (R) (R) (R) (R) (R)
(R)
(R)
Figure 6 - Control Timing Relationships
(c) 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
-10
dB
-20 -30 -40 50 100 300 1000 3000 10000
Frequency (Hz)
Figure 7 - Microphone Input Stages -Combined Low and Highpass Filter Frequency Response
10 0
-10
Figure 7 Mic.1/2 In to Compression Out VDD = 5.0V 55.0mVrms
Signal Input Level =
dB
-20 -30 -40
-50
Figure 8 Dev Limiter In to TX Filter Out
2000
3000
4000
6000
10000
VDD
=
5.0V 55.0mVrms
Frequency (Hz)
Signal Input Level =
Figure 8 - Post Deviation Limiter Lowpass Filter Response
20 10
Figure 9
0
dB
RX Audio In to SAT out VDD = 5.0V 100mVrms
-10
-20
Signal Input Level =
-30
-40
-50
3000
6000
10000
Frequency (Hz)
Figure 9 - RX SAT Path Bandpass Filter Response
(c) 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
Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not suggested. Supply Voltage Input Voltage at any pin (Ref VSS = 0V) Sink/source Current (Supply pins) (Other pins) Total Device Dissipation @TAMB 25C Derating Operating Temperature Storage Temperature Characteristics 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) Analog Input Impedances Mic.1 & 2 Play Comp In DTMF In Dev. Limiter In (Expanded) Audio In TX Mix In RX Audio In 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 -0.3 to 7.0 V -0.3V to (VDD + 0.3V) 30mA 20mA 800mW max. 10mW/C -40C to +85C -55C to +125C See Note Min. 4.5 - - - 10.0 - - - - 20.0 Typ. 5.0 6.5 0.5 63.0 - 10.0 10.0 10.0 50.0 - Max. 5.5 - - - - - - - - - Unit V mA mA kHz M k V/V MHz dB kHz
Operating Limits
All devices were measured under the following conditions unless otherwise noted. VDD = 5.0V TAMB = 25C Xtal/clock fXTAL = 4.0MHz Audio level 0dB ref. = 308mVrms @ 1kHz
- - - - - - 10.0 -
500 500 500 500 100 47.0 - 100
- - - - - - - -
k k k k k k M k k k k k k M
3
- - - - - - - - - - - 10.0
600 600 600 1.0 1.0 600 600 2.0 6.0 600 1.0 -
- - - - - - - - - - - -
(c) 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
Characteristics Control Interface Parameters Input Logic Levels Logic "1" Logic "0" IIN (logic "1" or "0") Input Capacitance
See Note
Min.
Typ.
Max.
Unit
1 1 1 1
3.5 - -1.0 -
- - - -
- 1.5 1.0 7.5
V V A pF
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
300 +24.0 -24.0 - -
- - 0 6.0
3000 - - - -
Hz dB/oct. dB/oct. dB dB/oct.
2 2 2 2 2 2 2 2 2 - - - - - - - - -
40 log(f/3000) 35.0 40 log(f/3000) 28.0 0 0 0 0 0 0 0 0 0
- - - - - - - - -
dB dB dB dB dB dB dB dB dB dB dB dB dB
-2.65 -0.2 - - -5.6 0.2 -1.0 - -
- - 1086 7.0
3.65 0.2 - - 0 0.6 1.0 -32.0 -20.0
dB dB mVp-p % dB dB dB dBp dB
0.4 - -40.0 -40.0
- - 300 +24.0 -36.0
3.75 -6.0 - -
- - 3000 - -
dB dB/oct. Hz dB/oct. dB/oct.
(c) 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
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 Notes
See Note
Min.
Typ.
Max.
Unit
2 2
- -
-7.0 0
- -
dB dB
3.75 -0.2 -28.0 1.5 -1.0 - -
-
9.70 0.2 0 2.5 1.0 -32.0 -34.0
dB dB dB dB dB dBp dB
2.0 - -40.0 -40.0
5970 19.0
20.0
6030 21.0
Hz dB
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 >10.0k.
(c) 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
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).
Handling Precautions
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
(R)
A
(R)
(R)
(R)
C
B
(R)
(R) (R)
(R)
H
(R) (R) (R)
D
(R)
F
(R)
(R)
(R)
E
G
(R)
Package Tolerances
(R)
L(R)
(R)(R)
(R)
K
(R)
M
(R)
(R)(R)
(R)
J
(R)
N
(R)
P
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Fig.11 MX826J 28-pin Ceramic Dual In-Line Package
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C
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A
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B
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D
H
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E
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Package Tolerances
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(c) 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.
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