MX826DW

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 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 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 µController, 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 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. 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. 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 Ω 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 1MΩ 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 1MΩ 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. © 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 1MΩ 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 1MΩ 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 1MΩ 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 1MΩ 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 1MΩ 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 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 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 Ω as required 100k Ω as required 100nF 100nF 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 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. © 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 © 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 µ 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 µ Controller software. It may be used with any µ Controller, and can, if desired, take advantage of the hardware serial I/O functions built into many types of µ Controller. Because of this flexibility and because the BUS data-rate is determined solely by the µ Controller, the system designer has complete freedom to choose a µ 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 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 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 © 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 © 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 µs µs µs µs µs 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. ® ® ® ® ® ® ® ® ® ® 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 -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 © 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 25°C 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 -40°C to +85°C -55°C to +125°C 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 MΩ kΩ V/V MHz dB kHz kΩ kΩ kΩ kΩ kΩ kΩ MΩ kΩ Ω Ω Ω kΩ kΩ Ω Ω kΩ kΩ Ω kΩ MΩ Operating Limits All devices were measured under the following conditions unless otherwise noted. VDD = 5.0V TAMB = 25°C Xtal/clock fXTAL = 4.0MHz Audio level 0dB ref. = 308mVrms @ 1kHz – – – – – – 10.0 – 500 500 500 500 100 47.0 – 100 – – – – – – – – 3 – – – – – – – – – – – 10.0 600 600 600 1.0 1.0 600 600 2.0 6.0 600 1.0 – – – – – – – – – – – – – © 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 µA 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. © 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 >10.0kΩ. © 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 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 ® A ® ® ® C B ® ® ® ® H ® ® ® D ® F ® ® ® E G ® Package Tolerances ® L® ®® ® K ® M ® ®® ® J ® N ® P ® R ® Fig.11 MX826J 28-pin Ceramic Dual In-Line Package ® ® C ®® ®® ®® ® A ® ® B ® ® D H ® ® ® ® E F G ® ® ® 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. ®