FULL-DUPLEX SCRAMBLER CORDLESS TELEPHONES Full-Duplex Audio Proce

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FULL-DUPLEX SCRAMBLER CORDLESS TELEPHONES Full-Duplex Audio Proce

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MX118
FULL-DUPLEX SCRAMBLER CORDLESS TELEPHONES
Full-Duplex Audio Processing On-Chip "Brick-wall" Filters (300-3000 Voltage CMOS High Baseband Carrier Rejection Excellent Audio Quality ECPA* Qualified Voice Protection
Applications
Cordless Telephones Wireless PBXs Battery Powered Portability
MX118P PDIP)
MX118DW (SOIC-16)
Description
MX118 full-duplex frequency inversion scrambler that secures cordless telephone conversations. audio paths, identical independent. Each consists following: 10th order lowpass filter kHz. balanced modulator with high baseband carrier rejection.
inversion carrier (injection tone). 14th order bandpass filter (300-3000 Hz). Input op-amps with externally adjustable gain. MX118 uses CMOS switched-capacitor filter technology operates from single supply range inversion carrier's frequency filter switching clock generated on-chip using external 4.433619 crystal clock input.
Figure Simplified Signal Paths
Electronics Communications Privacy (Title Code 2510 seq.).
MX118
Figure Block Diagram
Component Value 1.0M 1.0µF 33.0pF 47.0pF 0.47µF 1.0µF 1.0µF 4.433619
Tolerances: ±10%, ±20%
Notes: Xtal circuitry shown accordance with MX-COM's Application Note Crystal Oscillators (see Appendix).
Figure Recommended External Components Page MX-COM, INC.
MX118
Function Chart
Function
Xtal: This output clock oscillator inverter. Connection. Filter Output: This output channel input filter. should coupled Balanced Modulator Input) cap. Figure Balanced Modulator Input: This input channel balanced modulator. Internally biased VDD/2, should coupled Filter Output) capacitor VSS: Negative supply (GND). Output: This analog output channel internally biased VDD/2. Gain Output: This output channel gain adjusting op-amp. Figure test gain setting components. Input: This analog signal input channel This input gain adjusting op-amp whose gain internal components. Figure Input: This analog signal input channel This input gain adjusting op-amp whose gain internal components. Figure Gain Output: This output channel gain adjusting op-amp. Figure test gain setting components. Output: This analog output channel internally biased VDD/2. VBIAS: This analog bias line VDD/2. should coupled greater capacitor. Figure Balanced Modulator Input: This input channel balanced modulator. Internally biased VDD/2, should coupled Filter Output) capacitor Filter Output: This output channel input filter. should coupled Balanced Modulator Input) capacitor. Figure VDD: Positive supply Xtal/Clock: 4.433619 externally derived clock injected this pin. (See Figure
MX-COM, INC.
Page
MX118
Page
MX-COM, INC.
MX118 Application Information
Figure Typical Audio Frequency Response Single Scrambled De-scrambled Channel
System Gains
When calculating external components operation MX118 following should considered: input Lowpass Filter typical gain Balanced Modulator typical attenuation Output Bandpass Filter typical gain
Inver verter Inverter Works
Carrier Frequency minus Input Voice Frequency equals Scrambled Voice Frequency.
Figure Explanation MX118 Scramble Operation MX-COM, INC. Page
MX118
Specifications
Absolute Maximum Ratings
Exceeding maximum rating result device damage. Operation device outside operating limits suggested. Supply Voltage Input Voltage (Ref. Output sink/source current supply pins other pins Total Device Dissipation 25°C Derating Operating Temperature Storage Temperature -0.3 -0.3V (VDD 0.3V) ±30mA ±20mA 800mW max. 10mW/°C -10°C +70°C -40°C +85°C
Operating Limits
devices were measured under following conditions unless otherwise noted. 3.75 TAMB 25°C Clock 4.433619 Audio Level Ref. mVrms Noise Bandwidth 30kHz
Characteristics
Note
Min.
Typ.
Max.
Unit
Static Values Supply Voltage 3.75 Supply Current Input Impedance, Amplifiers 10.0 Output Impedance Amplifiers 10.0 Logic Voltage Logic Voltage On-Chip Xtal Oscillator 10.0 ROUT 10.0 Inverter Gain 10.0 Gain/Bandwidth Product 10.0 Dynamic Values (Single Channel) Analog Signal Input Levels -16.0 Carrier Breakthrough -64.0 Baseband Breakthrough -50.0 Carrier Frequency 3299 Analog Output Noise -47.0 -42.0 Upper Cut-off Frequency (-3dB) 3100 Passband Ripple (300 2950 -1.5 +1.5 Attenuation 30.0 34.0 Passband Gain Overall Modulated De-Modulated Channel Response (Scrambler-Descrambler End-to-End) Passband Frequencies 2950 Passband Ripple Passband Gain Distortion Frequency Attenuation NOTES Measured with Input Level Single Modulated Channel. Short circuit input, analog output, bandwidth. gain Accuracy dependent Xtal/clock.
Page
MX-COM, INC.
Microcircuits
COMMUNICATION SEMICONDUCTORS
Product Data
process creating more global image, three standard product semiconductor companies Microsystems (Consumer Microcircuits Limited (UK), MX-COM, (USA) Microcircuits (Singapore) Ltd) have undergone name changes and, whilst maintaining their separate names (CML Microcircuits (UK) Ltd, Microcircuits (USA) Microcircuits (Singapore) Ltd), operate under single title Microcircuits. These companies 100% owned operating companies Microsystems Group these changes purely changes name change underlying legal entities hence will have effect agreements contacts currently force. Microcircuits Product Prefix Codes Until latter part 1996, differentiator between products manufactured sold from MXCOM, Inc. Consumer Microcircuits Limited were denoted prefixes respectively. These products same silicon etc. today still carry same prefixes. latter part 1996, both companies adopted common prefix: CMX. This notification relevant product information which attached.
Company contact information below:
Microcircuits (UK)Ltd
COMMUNICATION SEMICONDUCTORS
Microcircuits (USA) Inc.
COMMUNICATION SEMICONDUCTORS
Microcircuits (Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon, Essex, 6WG, England Tel: (0)1621 875500 Fax: (0)1621 875600 uk.sales@cmlmicro.com www.cmlmicro.com
4800 Bethania Station Road, Winston-Salem, 27105, Tel: 5050, 0800 5577 Fax: 5054 us.sales@cmlmicro.com www.cmlmicro.com
Kallang Pudding Road, 09-05/ Mactech Industrial Building, Singapore 349307 Tel: 7450426 Fax: 7452917 sg.sales@cmlmicro.com www.cmlmicro.com
D/CML (D)/1 February 2002

FULL-DUPLEX SCRAMBLER CORDLESS TELEPHONES Full-Duplex Audio Proce

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