DB118 [CMLMICRO]
Full-Duplex Audio Processing;
| 型号： | DB118 |
| 厂家： | 
CML MICROCIRCUITS |
| 描述： | Full-Duplex Audio Processing |
| 文件： | 总7页 (文件大小：368K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MX118
FULL-DUPLEX SCRAMBLER FOR CORDLESS TELEPHONES
Features
Full-Duplex Audio Processing
On-Chip “Brick-wall” Filters (300-3000 Hz)
Low Voltage CMOS
High Baseband and Carrier Rejection
Excellent Audio Quality
ECPA* Qualified Voice Protection
Applications
Cordless Telephones & Wireless PBXs
Battery Powered Portability
MX118P
(16 pin PDIP)
MX118DW
(SOIC-16)
Description
3) A 3.3 kHz inversion carrier (injection tone).
4) A 14th order bandpass filter (300-3000 Hz).
5) Input op-amps with externally adjustable gain.
TheMX118isafull-duplexfrequencyinversionscram-
bler that secures cordless telephone conversations. The
two audio paths, C1 and C2, are identical and independ-
ent. Each consists of the following:
The MX118 uses CMOS switched-capacitor filter
technology and operates from a single supply in the range
of 3.0 V to 5.5 V. The inversion carrier's frequency and
filter switching clock are generated on-chip using an
external 4.433619 MHz crystal or clock input.
1) A 10th order lowpass filter cut off at 3.1 kHz.
2) A balanced modulator with high baseband and carrier
rejection.
Figure 1 - Simplified Signal Paths
* Electronics Communications Privacy Act (Title 18 US Code 2510 et seq.).
MX118
Figure 2 - Block Diagram
➤
➤
➤
➤
➤
➤
➤
➤
➤
➤
➤
➤
➤
Component
Value
1.0MΩ
1.0µF
33.0pF
47.0pF
0.47µF
1.0µF
➤
R1
C1
C2
C3
C4
C5
C6
X1
➤
1.0µF
4.433619 MHz
Tolerances: R = ±10%, C = ±20%
Notes: 1. Xtal circuitry shown is in accordance with MX-COM's Application Note on Crystal Oscillators (see Appendix).
Figure 3 - Recommended External Components
Page 2
MX-COM, INC.
MX118
Pin Function Chart
Pin Function
1
2
3
Xtal: This is the output of the clock oscillator inverter.
No Connection.
C1 Filter Output: This is the output of the channel 1 input filter. It should be coupled to pin 4 (C1
Balanced Modulator Input) by a 1.0 µF cap. See Figure 3.
4
5
C1 Balanced Modulator Input: This is the input to the channel 1 balanced modulator. Internally
biased at VDD/2, it should be coupled to pin 3 (C1 Filter Output) by capacitor C2.
VSS: Negative supply (GND).
6
7
C1 Output: This is the analog output of channel 1. It is internally biased at VDD/2.
C1 Gain Amp Output: This is the output pin of the channel 1 gain adjusting op-amp. See Figure 4
for test gain setting components.
8
9
C1 Input: This is the analog signal input to channel 1. This input is to a gain adjusting op-amp whose
gain is set by internal components. See Figure 4.
C2 Input: This is the analog signal input to channel 2. This input is to a gain adjusting op-amp whose
gain is set by internal components. See Figure 4.
10
C2 Gain Amp Output: This is the output pin of the channel 2 gain adjusting op-amp. See Figure 4
for test gain setting components.
11
12
C2 Output: This is the analog output of channel 2. It is internally biased at VDD/2.
VBIAS: This is the analog bias line at VDD/2. It should be coupled to VSS by a 1.0 µF or greater
capacitor. See Figure 3.
13
14
C2 Balanced Modulator Input: This is the input to the channel 2 balanced modulator. Internally
biased at VDD/2, it should be coupled to pin 14 (C2 Filter Output) by capacitor C7.
C2 Filter Output: This is the output of the channel 1 input filter. It should be coupled to pin 13 (C2
Balanced Modulator Input) by a 1.0 µF capacitor. See Figure 3.
15
16
VDD: Positive supply of 3.0 V to 5.5 V.
Xtal/Clock: 4.433619 MHz or an externally derived clock is injected at this pin. (See Figure 3.)
MX-COM, INC.
Page 3
MX118
Page 4
MX-COM, INC.
MX118
Application Information
Figure 5 - Typical Audio Frequency Response of a Single Scrambled or De-scrambled Channel
System Gains
When calculating the external components for the operation of the MX118 the following should be considered:
a) The input Lowpass Filter has a typical gain of 0.5 dB.
b) The Balanced Modulator has a typical attenuation of 4.0 dB.
c) The Output Bandpass Filter has a typical gain of 4.5 dB.
How the Inverter Works
Carrier Frequency minus Input Voice Frequency equals Scrambled Voice Frequency.
Figure 6 - An Explanation of the MX118 Scramble Operation
MX-COM, INC.
Page 5
MX118
Specifications
Absolute Maximum Ratings
Operating Limits
Exceeding the maximum rating can result in device
All devices were measured under the following
damage. Operation of the device outside the operating conditions unless otherwise noted.
limits is not suggested.
VDD = 3.75 V
Supply Voltage
-0.3 to 7.0 V
Input Voltage at any pin
(Ref. VSS = 0V)
TAMB = 25°C
-0.3V to (VDD + 0.3V)
Output sink/source current
supply pins
Clock = 4.433619 MHz
±30mA
±20mA
other pins
Total Device Dissipation
@ 25°C
Derating
Operating Temperature
Storage Temperature
Audio Level 0dB Ref. = 387 mVrms @ 1 kHz
Noise Bandwidth = 30kHz
800mW max.
10mW/°C
-10°C to +70°C
-40°C to +85°C
Characteristics
See Note
Min.
Typ.
Max.
Unit
Static Values
Supply Voltage
Supply Current
Input Impedance, Amplifiers
Output Impedance
C1, C2
3.0
-
1.0
3.75
4.0
10.0
5.5
6.0
-
V
mA
MΩ
-
200
-
Ω
Amplifiers
-
10.0
-
kΩ
Logic 1 Voltage
Logic 0 Voltage
On-Chip Xtal Oscillator
RIN
ROUT
Inverter Gain
70% VDD
-
-
-
-
30% VDD
10.0
-
-
-
-
-
MΩ
kΩ
V/V
MHz
-
-
-
10.0
10.0
10.0
Gain/Bandwidth Product
Dynamic Values (Single Channel)
Analog Signal Input Levels
Carrier Breakthrough
Baseband Breakthrough
Carrier Frequency
-16.0
-
-
-
-
3100
-1.5
30.0
-2
-
+3
-
-
-
-42.0
-
+1.5
-
dB
dB
dB
Hz
dB
Hz
dB
dB
dB
1,2
1,2
5
-64.0
-50.0
3299
-47.0
-
Analog Output Noise
3
Upper Cut-off Frequency (-3dB)
Passband Ripple (300 to 2950 Hz)
Attenuation at 3.3 kHz
-
34.0
0.5
Passband Gain
+3
Overall Modulated or De-Modulated Channel Response (Scrambler-Descrambler End-to-End)
Passband Frequencies
Passband Ripple
Passband Gain @ 1 kHz
Distortion
300
-3
0
-
26
-
-
1.0
-
2950
+2
3.0
3.0
-
Hz
dB
dB
%
4
1
Low Frequency Attenuation @ 150 Hz
34
dB
NOTES
1. Measured with Input Level -3 dB.
2. Single Modulated Channel.
3. Short circuit input, any analog output, in 30 kHz bandwidth.
4. Op Amp gain 0 dB.
5. Accuracy dependent on Xtal/clock.
Page 6
MX-COM, INC.
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
CML Microcircuits
(USA) Inc.
CML Microcircuits
(Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
COMMUNICATION SEMICONDUCTORS
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