MX014

DATA BULLETIN MX014 Features • CTCSS Compatible • Fixed Frequency Inversion • Low Power CMOS Voice Band inverter Applications • Land Mobile Radio Systems • Community Repeaters BALMOD DEEMP Out RX Buffer In TX Audio Feedback TX Audio In 6dB/Octave Pre-emphasis 10dB Gain Rx Path Path Invert TX Buffer In BPF Out Filter TX 6dB/Octave De-emphasis TX Audio Out TX BIAS RX Audio In Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz Filsav 1 BIAS RX Path Filsav 1 RX Path Carrier RX Audio Out Filsav 2 RX Audio Feedback 3333 Hz PTT PTT RX Audio Enable RX Audio Enable PTL PTL Privacy Enable Clock Carrier Filsav 1 Filsav 2 CLK 3333 Hz CLK Generator Clock LOGIC RX Path EMPSAV TX Path Invert V DD V SS BIAS 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, PvtSQUELCHTM 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. © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 2 MX014 CONTENTS Section Page 1. Block Diagram .................................................................................................................................. 3 2. Signal List ......................................................................................................................................... 4 3. External Components ...................................................................................................................... 5 4. Application ....................................................................................................................................... 6 5. Performance Specification.............................................................................................................. 8 5.1 Electrical Performance .............................................................................................................................. 8 5.1.1 Absolute Maximum Ratings ...............................................................................................................................8 5.1.2 Operating Limits.................................................................................................................................................8 5.1.3 Operating Characteristics ..................................................................................................................................8 5.2 Packaging ................................................................................................................................................ 10 MX•COM, Inc. reserves the right to change specifications at any time and without notice. © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 3 MX014 1. Block Diagram BALMOD DEEMP Out RX Buffer In TX Buffer In BPF Out Filter TX Audio Feedback TX Audio In 6dB/Octave Pre-emphasis 10dB Gain Rx Path Path Invert TX 6dB/Octave De-emphasis TX Audio Out TX BIAS RX Audio In Bandpass Filter 300-3033 Hz Bandpass Filter 300-3033 Hz Filsav 1 BIAS RX Path Filsav 1 RX Path Carrier RX Audio Out Filsav 2 RX Audio Feedback 3333 Hz PTT PTT RX Audio Enable RX Audio Enable PTL PTL Privacy Enable Clock Carrier Filsav 1 Filsav 2 CLK 3333 Hz CLK Generator Clock LOGIC RX Path EMPSAV TX Path Invert V DD V SS BIAS Figure 1: Device Block Diagram © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 4 MX014 2. Signal List Pin No. 1 2 3 4 5 6 7 8 9 Name XTAL Description 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. This is the inverted 4MHz clock output for use when a crystal oscillator is used, or as a buffer for driving other clocked devices. Push To Talk is an input with a 3MΩ pull-down resistor. This is the inverted PTT output. It has a 100kΩ output impedance. Push To Listen is an input with a 3MΩ pull-down resistor. XTAL PTT PTT PTL PTL RXAUDEN Push To Listen is the inverted output of PTL; it has a 100kΩ output impedance. RX Audio Enable is an input with a 3MΩ pull-down resistor. RXAUDEN PRIVEN RX Audio Enable is the inverted output of RX Audio Enable; it has a 100kΩ output impedance. 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. This is the receive audio output pin. It is biased at VDD/2 when in the TX mode. This is the “send” voice output pin. It is biased at VDD/2 when in RX mode. The negative supply pin (ground). For a gain of one in the RX Output stage, these two pins are wire linked together. However, if gain is introduced at the RX input, attenuation may be introduced at the RX Output using these pins and two resistors. The pre-emphasis circuit has a 10dB gain at 1 kHz. Additional gain, or attenuation can be introduced as in the RX path. This is the internally generated VDD/2 decoupling pin. 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. This is the input to the balanced modulator. It must be a.c. coupled to the Filter Output. 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. RX Audio Feedback is the output of an op-amp at the input of the RX path. See RXIN. 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. TX Audio Feedback is the output of an op-amp at the input of the TX path. See TXIN. The positive supply pin. Table 1: Signal List 10 11 12 13 14 15 16 17 18 19 20 RXOUT TXOUT VSS BPFOUT RXBIN DEMPOUT TXBIN BIAS FILTR BALMOD RXIN 21 22 RXFB TXIN 23 24 TXFB VDD © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 5 MX014 3. External Components Configuration for Radios with Existing Pre- and De-emphasis. 1 XTAL MX014 V DD 2 XTAL TXFB 3 PTT TXIN 4 RXFB PTT 5 PTL RXIN 6 PTL BALMOD 7 RXAUDEN FILTR 8 RXAUDEN BIAS 9 TXBIN PRIVEN 10 RXOUT DEMPOUT 11 TXOUT RXBIN 12 VSS BPFOUT 24 23 22 21 20 19 18 17 16 15 14 13 C4 R7 R5 R8 R6 R1 R3 For Use in Radios without Pre- and De-emphasis. 24 1 XTAL MX014 V DD 2 XTAL 23 TXFB 22 3 PTT TXIN 4 RXFB 21 PTT 20 5 PTL RXIN 6 PTL BALMOD 19 7 RXAUDEN 18 FILTR 17 8 RXAUDEN BIAS 16 9 TXBIN PRIVEN 10 RXOUT DEMPOUT 15 11 TXOUT RXBIN 14 12 VSS BPFOUT 13 X1 VDD C1 R2 C2 R4 C3 TX Channel RX Channel X1 VDD R1 R3 C1 R2 C2 R4 C3 C4 R10 R11 R9 R12 Bias Bias TX Channel RX Channel Bias Bias Figure 2: External Components Connections R8 R7 + R8 R6 R5 + R6 R10 R9 + R10 R12 R11 + R12 TX Attenuation = TX Attenuation = For a gain of 1, R8 = ∞, R7 = 0 RX Attenuation = For a gain of 1, R9 = 0, R10 = ∞ RX Attenuation = For a gain of 1, R6 = ∞, R5 = 0 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. © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 6 MX014 4. Application BIAS R8 C1 DEEMP Out R7 TX Buffer In BALMOD TX Audio Feedback C1 TX Channel R2 R1 Filter TX Audio In Path Invert -6dB/Octave De-emphasis + 6dB/Octave Pre-emphasis 10dB Gain Bandpass Filter 300-3033 Hz TX Audio Out TX BIAS Bandpass Filter 300-3033 Hz Carrier BIAS C3 R5 RX Buffer In R6 BALMOD Path Invert Filter BPF Out BIAS C2 RX Channel R3 R4 Bandpass Filter 300-3033 Hz Carrier Bandpass Filter 300-3033 Hz RX Audio Out + RX RX Audio In RX Audio Feedback Note: Dotted Lines contain on-chip functions Figure 3: Voice Privacy Application (Add-on) © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 7 BIAS R10 C1 R9 MX014 BALMOD TX Audio Feedback C1 TX Channel R2 R1 Filter Path Invert TX Buffer In BPF Out TX Audio In + 6dB/Octave Pre-emphasis 10dB Gain Bandpass Filter 300-3033 Hz TX Audio Out TX BIAS Bandpass Filter 300-3033 Hz Carrier BIAS C3 DEEMP Out R12 R11 BALMOD Path Invert BIAS C2 RX Channel R3 R4 Bandpass Filter 300-3033 Hz Carrier Bandpass Filter 300-3033 Hz + -6dB/Octave De-emphasis RX Buffer In Filter RX RX Audio Out RX Audio In RX Audio Feedback Note: Dotted Lines contain on-chip functions Figure 4: Voice Processing Application (OEM) © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 8 MX014 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 Supply Voltage Input Voltage at any pin (ref. VSS + 0 V) Current: VDD VSS Any other pin J / P / LH Packages Maximum Device Dissipation at TAMB = 25°C Derating above 25°C Operating Temperature Range: Storage Temperature Range: 5.1.2 Operating Limits Correct operation of the device outside these limits is not implied. Min. VDD Clock Frequency Operating Temperature 5.1.3 Operating Characteristics For the following conditions unless otherwise specified: VDD = 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 Static Values Supply Current: RX/TX Operating (Private) RX/TX Operating (Clear) Standby Audio Input Impedance Audio Output Impedance Digital Output Impedance(Pulldown) Digital I/O Impedance Input Logic “1” Input Logic “0” 70% 30% 5 1 100 4 10 0.5 11.0 8.0 1.8 mA mA mA MΩ kΩ MΩ kΩ VDD VDD Min. Typ. Max Units -40 4.5 Typ. 5.0 4.0 85 Max. 5.5 Units V MHz °C -40 -55 800 10 85 125 mW mW/°C above 25°C °C °C 30 30 20 mA mA mA -0.3 (VDD + 0.3 ) V Min. -0.3 Max. 7.0 Units V © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 9 MX014 Notes RX Clear Performance Total Harmonic Distortion Output Noise Level Passband Gain Passband Ripple (300-3033 Hz) Stopband Attenuation (fin > 3333 Hz) (fin > 3633 Hz) (fin < 250 Hz) RX Inverted Total Harmonic Distortion Output Noise Level Passband Ripple (300 - 3033 Hz) Stopband Attenuation (fin > 3333 Hz) (fin > 3633 Hz) Highpass Attenuation (fin < 250 Hz) TX Clear Total Harmonic Distortion Output Noise Level Passband Gain (fin = 300 - 3033 Hz) Passband ripple (fin = 300 - 3033 Hz) Stopband Attenuation (fin > 3333 Hz) (fin > 3633 Hz) (fin < 250 Hz) TX Inverted Total Harmonic Distortion Output Noise Level Passband Ripple (fin = 300 - 3333 Hz) Stopband Attenuation (fin > 3333 Hz) (fin > 3633 Hz) (fin < 250 Hz) Pre-Emphasis Frequency Response Gain at 1 kHz De-emphasis Frequency response Gain at 1 kHz 3 3 3 1,3 1,3 2 2 1 1 1 2 1,3 2,3 3 1 1 2 Min. Typ. 2 2 0 Max 5 Units % mVRMS dB -3 20 45 42 4 4 +2 dB dB dB dB % mVRMS 4 50 60 60 2 2 0 4 20 45 42 4 4 4 50 60 60 6 10 -6 0 5 dB dB dB dB % mVrms dB dB dB dB dB % mVrms dB dB dB dB dB/Octave dB dB/Octave dB © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 10 MX014 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 E B Y DA W C K J W T H Package Tolerances DIM. A B C D E F G H J K P T W Y MIN. TYP. MAX. 0.380 (9.61) 0.409 (10.40) 0.380 (9.61) 0.409 (10.40) 0.128 (3.25) 0.146 (3.70) 0.417 (10.60) 0.435 (11.05) 0.417 (10.60) 0.435 (11.05) 0.250 (6.35) 0.250 (6.35) 0.023 (0.58) 0.018 (0.45) 0.022 (0.55) 0.047 (1.19) 0.048 (1.22) 0.049 (1.24) 0.051 (1.30) 0.006 (0.152) 0.009 (0.22) 45° 30° 6° PIN 1 P G F NOTE : All dimensions in inches (mm.) Angles are in degrees Figure 5: 24-pin PLCC Mechanical Outline: Order as part no. MX014LH © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. Voice Band Inverter 11 MX014 A Package Tolerances DIM. A B C E E1 H J J1 K L P T Y MIN. TYP. MAX. 1.200 (30.48) 1.270 (32.26) 0.500 (12.70) 0.555 (14.04) 0.151 (3.84) 0.220 (5.59) 0.600 (15.24) 0.670 (17.02) 0.590 (14.99) 0.625 (15.88) 0.015 (0.38) 0.045 (1.14) 0.015 (0.38) 0.023 (0.58) 0.040 (1.02) 0.065 (1.65) 0.066 (1.67) 0.074 (1.88) 0.121 (3.07) 0.160 (4.05) 0.100 (2.54) 0.008 (0.20) 0.015 (0.38) 7° NOTE : All dimensions in inches (mm.) Angles are in degrees B E1 Y E PIN1 T K H L J J1 P C Figure 6: 24-pin PDIP Mechanical Outline: Order as part no. MX014P A Package Tolerances DIM. MIN. TYP. MAX. A B C E E1 F H J J1 K K1 L P T 1.240 (31.50) 1.260 (32.00) 0.514 (13.06) 0.583 (14.79) 0.165 (4.19) 0.230 (5.84) 0.600 (15.23) 0.670 (17.00) 0.594 (15.09) 0.615 (15.61) 1.100 (27.94) 0.02 (0.51) 0.018 (0.46) 0.055 (1.39) 0.050 (1.27) 0.080 (2.03) 0.074 (1.88) 0.080 (2.03) 0.115 (2.92) 0.200 (5.08) 0.10 (2.54) 0.0106 (0.269) 0.0094 (0.239) B E1 E PIN1 K H L J J1 F P K1 C T NOTE : All dimensions in inches (mm.) Angles are in degrees Figure 7: 24-pin CDIP Mechanical Outline: Order as part no. MX014J © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies. CML Microcircuits COMMUNICATION SEMICONDUCTORS CML Product Data 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 (USA) Inc. COMMUNICATION SEMICONDUCTORS CML Microcircuits (Singapore)PteLtd 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, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com D/CML (D)/2 May 2002