MX014 CMLMICRO | Alldatasheet
Document overview
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Technical content
Datasheet sections
- 5.1 Electrical Performance
- 5.1.1 Absolute Maximum Ratings
- 5.1.2 Operating Limits
- 5.1.3 Operating Characteristics
- 5.2 Packaging
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Features Applications
- CTCSS Compatible
- Fixed Frequency Inversion
- Low Power CMOS
- Land Mobile Radio Systems
- Community Repeaters 6dB/Octave Pre-emphasis 10dB Gain TX Audio Feedback TX Audio In RX Audio In RX Audio Feedback BIAS RX Path Rx Path Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz Filsav 1 Filsav 1 Filsav 2Carrier 6dB/Octave De-emphasis Path Invert TX TX RX Path TX Audio Out RX Audio Out BIAS CLK Generator Clock Clock CLK 3333 Hz V BIAS V 3333 Hz PTT PTT RX Audio Enable RX Audio Enable PTL PTL Privacy Enable Carrier Filsav 1 Filsav 2 RX Path EMPSAV TX Path Invert LOGIC Filter BALMOD BPF Out DEEMP Out RX Buffer In TX Buffer In DD SS The MX014 Voice Band Inverter gives the security of private voice communications to land mobile radio users, as well as to the users of other shared radio channel systems. Designed for use in half-duplex systems, the MX014 exchanges high and low frequencies in the voiceband and renders transmitted messages unintelligible. This privacy function is achieved by a single frequency inversion. When used with CTCSS, PvtSQUELCH TM privacy adapter operation is achieved. Sharp cut-off in the internal voiceband filters permits operation with CTCSS and similar sub-audio signaling schemes. This results in high quality recovered audio. The core of the MX014 consists of two audio band pass filters and a balanced modulator. The device uses a programmable clock divider which controls the carrier and filter cut-off frequencies. Control of the RX/TX, PTL and privacy function is by pin selection. The MX014 operates from a single 5V supply and uses a 4 MHz crystal oscillator to ensure the correct pitch in recovered speech. Signal coupling and decoupling are the only external components needed. The device is available in 24-pin PLCC (MX014LH), 24-pin PDIP (MX014P) and 24-pin CDIP (MX014J) packages.
Voice Band Inverter 3 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. 1. Block Diagram 6dB/Octave Pre-emphasis 10dB Gain TX Audio Feedback TX Audio In RX Audio In RX Audio Feedback BIAS RX Path Rx Path Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz Filsav 1 Filsav 1 Filsav 2Carrier 6dB/Octave De-emphasis Path Invert TX TX RX Path TX Audio Out RX Audio Out BIAS CLK Generator Clock Clock CLK 3333 Hz V BIAS V 3333 Hz PTT PTT RX Audio Enable RX Audio Enable PTL PTL Privacy Enable Carrier Filsav 1 Filsav 2 RX Path EMPSAV TX Path Invert LOGIC Filter BALMOD BPF Out DEEMP Out RX Buffer In TX Buffer In DD SS Figure 1: Device Block Diagram
Voice Band Inverter 4 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. 2. Signal List Pin No. Name Description 1 XTAL An external 4MHz clock can be applied to this input. The clock circuit on chip has a resistor and capacitors so that only one external crystal is required.
2 XTAL This is the inverted 4MHz clock output for use when a crystal oscillator is used, or as a buffer
for driving other clocked devices. 3P T T Push To Talk is an input with a 3MΩ pull-down resistor. 4 PTT This is the inverted PTT output. It has a 100kΩ output impedance. 5P T L Push To Listen is an input with a 3MΩ pull-down resistor. 6 PTL Push To Listenis the inverted output of PTL; it has a 100kΩ output impedance. 7 RXAUDEN RX Audio Enable is an input with a 3MΩ pull-down resistor. 8 RXAUDEN RX Audio Enableis the inverted output of RX Audio Enable; it has a 100kΩ output impedance.
9 PRIVEN Privacy Enable controls the input action of the balanced modulator by switching the carrier
clock. When audio signals are inverted, the signal path gain is adjusted automatically to compensate for the upper sideband loss. It contains a 3MΩ pull-down resistor. 10 RXOUT This is the receive audio output pin. It is biased at VDD /2 when in the TX mode. 11 TXOUT This is the “send” voice output pin. It is biased at VDD /2 when in RX mode. 12 V SS The negative supply pin (ground). 13 BPFOUT For a gain of one in the RX Output stage, these two pins are wire linked together. However,
14 RXBIN if gain is introduced at the RX input, attenuation may be introduced at the RX Output using
these pins and two resistors. 15 DEMPOUT The pre-emphasis circuit has a 10dB gain at 1 kHz. Additional gain, or attenuation can 16 TXBIN be introduced as in the RX path. 17 BIAS This is the internally generated V DD /2 decoupling pin. 18 FILTR This filter is the output of the Input Audio BPF and must be a.c. coupled into the Balanced Modulator Input through a 0.1µF capacitor. 19 BALMOD This is the input to the balanced modulator. It must be a.c. coupled to the Filter Output. 20 RXIN This is a negative input of an op-amp at the input of the RX path. It can be used, along with RX Audio Feedback and two external resistors, to increase the signal to its optimum level prior to frequency inversion/filtering. This may improve the S/N. 21 RXFB RX Audio Feedback is the output of an op-amp at the input of the RX path. See RXIN. 22 TXIN The negative input of an op-amp at the input of the TX path. It can be used, along with TX Audio Feedback and two external resistors, to increase the signal to its optimum level prior to frequency inversion/filtering. This may improve S/N. 23 TXFB TX Audio Feedback is the output of an op-amp at the input of the TX path. See TXIN. 24 V DD The positive supply pin. Table 1: Signal List
Voice Band Inverter 5 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. 3. External Components 12 13 24XTAL XTAL PTT PTT PTL PTL RXAUDEN RXAUDEN PRIVEN RXOUT TXOUT V V V V V V BPFOUT RXBIN DEMPOUT TXBIN BIAS FILTR BALMOD RXIN RXFB TXIN TXFB RX Channel TX Channel MX014 Bias Bias 12 13 24XTAL XTAL PTT PTT PTL PTL RXAUDEN RXAUDEN PRIVEN RXOUT TXOUT BPFOUT RXBIN DEMPOUT TXBIN BIAS FILTR BALMOD RXIN RXFB TXIN TXFB RX Channel TX Channel MX014 R11 R10 R12 Bias Bias Configuration for Radios with Existing Pre- and De-emphasis. For Use in Radios without Pre- and De-emphasis. SS SS DD DD DD DD Figure 2: External Components Connections TX Attenuation R8 R7 R8 For a gain of 1, R8 , R7 0 = + =∞ = TX Attenuation R10 R9 R10 For a gain of 1, R9 0, R10 = + == ∞ RX Attenuation R6 R5 R6 For a gain of 1, R6 , R5 0 = + =∞ = RX Attenuation R12 R11 R12 For a gain of 1, R11 0, R12 = + == ∞ Table 2: Gain and Attentuation Calculations Recommended External Component Notes: 1. Component Values: C1- C3 = 0.1 µF, C4 = 1.0 µF, X1 = 4 MHz crystal 2. R1 to R12 values will depend on the configuration and the gain or attenuation required. However R1, R3, R5, R7, and R11 should be 100 kΩ or greater. To add gain or attenuate, use R5-R12 as shown. See pin descriptions for more information. 3. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult your crystal manufacturer.
Voice Band Inverter 6 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. 4. Application Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz BIAS RX Channel RX Audio Feedback RX Audio In Filter BALMOD Path Invert BPF Out RX Buffer In RX Audio Out RX Carrier 6dB/Octave Pre-emphasis 10dB Gain Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz -6dB/Octave De-emphasis BIAS TX Channel TX Audio Feedback TX Audio In Filter BALMOD Path Invert DEEMP Out TX Buffer InTX Audio Out TX Carrier BIAS BIAS Note: Dotted Lines contain on-chip functions Figure 3: Voice Privacy Application (Add-on)
Voice Band Inverter 7 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz BIAS R11 R12 RX Channel RX Audio Feedback RX Audio In Filter BALMOD Path Invert DEEMP Out RX Buffer In RX Audio Out RX Carrier 6dB/Octave Pre-emphasis 10dB Gain Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz -6dB/Octave De-emphasis BIAS R10 TX Channel TX Audio Feedback TX Audio In Filter BALMOD Path Invert BPF Out TX Buffer InTX Audio Out TX Carrier BIAS BIAS Note: Dotted Lines contain on-chip functions Figure 4: Voice Processing Application (OEM)
Voice Band Inverter 8 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. 5. Performance Specification
5.1 Electrical Performance
5.1.1 Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device. General Min. Max. Units Supply Voltage -0.3 7.0 V Input Voltage at any pin (ref. VSS + 0 V) -0.3 (V DD + 0.3 ) V Current: VDD 30 mA VSS 30 mA Any other pin 20 mA J / P / LH Packages Maximum Device Dissipation at TAMB = 25°C 800 mW Derating above 25°C 10 mW/°C above 25°C Operating Temperature Range: -40 85 °C Storage Temperature Range: -55 125 °C
5.1.2 Operating Limits
Correct operation of the device outside these limits is not implied. Min. Typ. Max. Units VDD 4.5 5.0 5.5 V Clock Frequency 4.0 MHz Operating Temperature -40 85 °C
5.1.3 Operating Characteristics
For the following conditions unless otherwise specified: V DD = 5.0V at TAMB = 25°C Clock Frequency = 4.0MHz, 0dB reference = 300mVRMS (Note: Measured at pin 18, the FILTR output. This pin must not exceed 300mVRMS at 1kHz in Tx and 500mVRMS at any frequency in Rx, or clipping may occur. The difference in levels is due to the pre-emphasis filter in the Tx path. Notes Min. Typ. Max Units Static Values Supply Current: RX/TX Operating (Private) 11.0 mA RX/TX Operating (Clear) 8.0 mA Standby 4 1.8 mA Audio Input Impedance 10 M Ω Audio Output Impedance 5 0.5 kΩ Digital Output Impedance(Pulldown) 1 M Ω Digital I/O Impedance 100 kΩ Input Logic “1” 70% V DD Input Logic “0” 30% V DD
Voice Band Inverter 9 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Notes Min. Typ. Max Units RX Clear Performance Total Harmonic Distortion 1 2 5 % Output Noise Level 2 2 mV RMS Passband Gain 0 dB Passband Ripple (300-3033 Hz) 1 -3 +2 dB Stopband Attenuation (fin > 3333 Hz) 20 dB (fin > 3633 Hz) 45 dB (fin < 250 Hz) 42 dB RX Inverted Total Harmonic Distortion 1,3 4 % Output Noise Level 2,3 4 mV RMS Passband Ripple (300 - 3033 Hz) 3 4 dB Stopband Attenuation (fin > 3333 Hz) 50 dB (fin > 3633 Hz) 60 dB Highpass Attenuation (fin < 250 Hz) 60 dB TX Clear Total Harmonic Distortion 1 2 5 % Output Noise Level 2 2 mV rms Passband Gain (fin = 300 - 3033 Hz) 1 0 dB Passband ripple (fin = 300 - 3033 Hz) 1 4 dB Stopband Attenuation (fin > 3333 Hz) 2 20 dB (fin > 3633 Hz) 45 dB (fin < 250 Hz) 42 dB TX Inverted Total Harmonic Distortion 1,3 4 % Output Noise Level 2 4 mV rms Passband Ripple (fin = 300 - 3333 Hz) 1,3 4 dB Stopband Attenuation (fin > 3333 Hz) 3 50 dB (fin > 3633 Hz) 3 60 dB (fin < 250 Hz) 3 60 dB Pre-Emphasis Frequency Response 6 dB/Octave Gain at 1 kHz 10 dB De-emphasis Frequency response -6 dB/Octave Gain at 1 kHz 0 dB
Voice Band Inverter 10 MX014 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Operating Characteristics Notes: 1. Input signal = 1kHz tone 0dB (300 mVRMS ) 2. Input AC short circuit, audio path enabled. Measured in 30 kHz band 3. Due to frequency inversion (and pre- and de-emphasis), this refers to deviation from expected ideal response 4. Standby occurs in RX with RX Audio Enable = 0, RX Audio Enable = 1, and PTL = 1 5. TX Audio Out and RX Audio Out only
5.2 Packaging
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) 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) 0.380 (9.61) 0.380 (9.61) 0.128 (3.25) 0.048 (1.22) 45° F G P AD B E PIN 1 W C J K Y W HT Figure 5: 24-pin PLCC Mechanical Outline: Order as part no. MX014LH
In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached. CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking On CML Microcircuits (USA) products, the ‘MX-COM’ textual logo is being replaced by a ‘CML’ textual logo. Company contact information is as below: CML Microcircuits (UK)Ltd COMMUNICATION SEMICONDUCTORS CML Microcircuits COMMUNICATION SEMICONDUCTORS CML Microcircuits (Singapore)PteLtd COMMUNICATION SEMICONDUCTORS CML Microcircuits (USA) Inc. COMMUNICATION SEMICONDUCTORS Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 uk.sales@cmlmicro.com www.cmlmicro.com
4800 Bethania Station Road,
Winston-Salem, NC 27105, USA Tel: +1 336 744 5050, 0800 638 5577 Fax: +1 336 744 5054 us.sales@cmlmicro.com www.cmlmicro.com No 2 Kallang Pudding Road, 09-05/
06 Mactech Industrial Building,
Tel: +65 7450426 Fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com D/CML (D)/2 May 2002