MX128E4 [CMLMICRO]
Cordless Telephone Scrambler/Descrambler, CMOS, PDSO16, TSSOP-16;
| 型号： | MX128E4 |
| 厂家： | 
CML MICROCIRCUITS |
| 描述： | Cordless Telephone Scrambler/Descrambler, CMOS, PDSO16, TSSOP-16 无绳技术 电信 光电二极管 电信集成电路 |
| 文件： | 总11页 (文件大小：282K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FX/MX128
Audio Band
CMLMicrocircuits
Scrambler
COMMUNICATION SEMICONDUCTORS
D/128/2 January 2003
Provisional Information
Features
Applications
·
·
·
·
·
·
·
Full-Duplex Audio Processing
On-Chip Filters
·
·
·
·
Cordless Telephones
Wireless PBX
Carrier Rejection >55dB
Uses IF (10.24 MHz) Clock
Excellent Audio Quality
Low Power Operation (3.0V)
Battery Powered Portability
Two-Way Radio
Leisure Radio
(FRS, GMRS, MURS, PMR446)
1.1 Brief Description
The FX/MX128 is a full-duplex frequency inversion scrambler designed to provide secure conversations.
The Rx and Tx audio paths consist of the following:
1. A switched-capacitor balanced modulator with high baseband and carrier rejection.
2. A 3.3 kHz inversion carrier (injection tone).
3. A 3100 Hz lowpass filter.
4. Input op-amps with externally adjustable gain.
The FX/MX128 uses mixed signal CMOS switched-capacitor filter technology and operates from a single
supply in the range of 3.0 to 5.5 volts. The inversion carrier's frequency and filter switching clock are
generated on-chip using an external 10.24 MHz or 3.58/3.6864 MHz crystal or clock input (selectable).
This device is available in the following package styles: 16-pin SOIC,TSSOP and PDIP.
ã 2003 CML Microsystems Plc
Audio Band Scrambler
FX/MX128
CONTENTS
Section
Page
1.2
1.3
1.4
1.5
1.6
1.7
Block Diagram.......................................................................................................... 3
Signal List................................................................................................................. 4
External Components.............................................................................................. 5
Application ............................................................................................................... 6
Application Notes .................................................................................................... 6
Performance Specification...................................................................................... 7
1.7.1
1.7.2
Electrical Performance ..............................................................................................7
Packaging ...............................................................................................................10
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D/128/2
Audio Band Scrambler
FX/MX128
1.2 Block Diagram
Figure 1: Block Diagram
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D/128/2
Audio Band Scrambler
FX/MX128
1.3 Signal List
All
Signal
Description
Packages
Pin No.
1
Name
XTALN
Type
O/P
This is the output of the clock oscillator inverter.
10.24 MHz, 3.58/3.6864 MHz, or an externally derived clock is
injected at this pin. See Figure 1.
2
3
4
XTAL/CLOCK
I/P
-
N/C
O/P
No connection should be made to this pin.
This is the analogue output of the transmit channel. It is internally
biased at VDD/2.
TXOUT
This is the output pin of the transmit channel gain adjusting op-
amp.
TX GAIN AMP
OUT
5
6
O/P
See Figure 3 for gain setting components.
This is the analogue signal input to the transmit channel. This
input goes to a gain adjusting op-amp whose gain is set by
external components. See Figure 3.
TXIN
I/P
7
8
-
N/C
No connection should be made to this pin.
Negative supply (GND)
VSS
Power
This is an internally generated bias voltage output (VDD/2).
It should NOT be decoupled with a capacitor.
9
VBIAS
-
O/P
N/C
10
No connection should be made to this pin.
This is the analogue signal input to the receive channel. This
input goes to a gain adjusting op-amp whose gain is set by
external components. See Figure 3.
11
RXIN
I/P
RX GAIN AMP
OUT
This is the output pin of the receive channel gain adjusting op-
amp. See Figure 3 for gain setting components.
12
13
14
O/P
O/P
I/P
This is the analogue output of the receive channel. It is internally
biased at VDD/2.
RXOUT
CLR
A logic 1 on this input selects the invert mode. A logic 0 selects
the clear (not inverted) mode.
Selects either 10.24 or 3.58/3.6864 MHz clock frequency. A logic
“1” selects 10.24 MHz, and a logic “0” selects 3.58/3.6864 MHz.
This input is internally pulled high.
CLOCK
SELECT
15
16
I/P
VDD
Power
Positive supply of 3.0V to 5.5 V
Notes:
I/P
=
=
=
Input
Output
No Connection
O/P
N/C
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
1.4 External Components
Components
Value
10.24MHz
1.0MW
0.47µF
Value
3.58/3.6864 MHz
1.0MW
X1
R1
C1
C2
C3
0.47µF
22.0pF
33.0pF
22.0pF
47.0pF
Note: Xtal circuitry shown is in accordance with CML’s Xtal Application Note.
Figure 2: Recommended External Components
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
1.5 Application
Figure 3: Block Diagram of a Typical Application of the FX/MX128 (Cordless Phone)
1.6 Application Notes
Formulae for calculating the carrier frequency, upper cutoff frequency and lower cutoff frequency with
clock select pin high are as follows:
Carrier Frequency
=
=
=
(3.2995kHz / 10.24MHz) * XTAL frequency
(2.800kHz / 10.24MHz) * XTAL frequency
(400Hz / 10.24MHz) * XTAL frequency
Upper Cutoff Frequency
Lower Cutoff Frequency
Formulae for calculating the carrier frequency, upper cutoff frequency and lower cutoff frequency with
clock select pin low are as follows:
Carrier Frequency
=
=
=
(3.2995kHz / 3.415MHz) * XTAL frequency
(2.800kHz / 3.415MHz) * XTAL frequency
(400Hz / 3.415MHz) * XTAL frequency
Upper Cutoff Frequency
Lower Cutoff Frequency
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
1.7 Performance Specification
1.7.1 Electrical Performance
Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
General
Min.
-0.3
-0.3
-30
Max.
7.0
Units
Supply (VDD - VSS)
V
V
Voltage on any pin to VSS
Current in or out VDD and VSS pins
Current in or out of any other pin
VDD + 0.3
+30
mA
mA
-20
+20
E4/P3/D4 Packages
Min.
—
Max.
1000
13
Units
mW
Total Device Dissipation (P3 and D4) at TAMB = 25°C
...Derating (P3 and D4)
—
mW/°C
mW
Total Device Dissipation (E4) at TAMB = 25°C
...Derating (E4)
—
400
5.3
—
mW/°C
°C
Storage Temperature
-55
-40
+125
+85
Operating Temperature
°C
Operating Limits
Correct operation of the device outside these limits is not implied.
Min.
Max.
5.5
Units
V
Supply (VDD - VSS)
Operating Temperature
Clock Frequency
3.0
-40
—
+85
°C
10.24
MHz
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
Operating Characteristics
For the following conditions unless otherwise specified:
VDD = 3.3V at TAMB = 25°C
Clock Frequency = 10.24MHz
Audio Level 0dB ref. at 1kHz = (VDD-1) x 150mVRMS e.g. VDD = 3.3V 0dB = 345mVRMS.
Notes
Min.
Typ.
Max
Units
Static Values
Supply Current
—
2.0
3.0
mA
Input Impedance
Digital
2
2
100
1.0
—
—
—
kW
Amplifiers
10.0
MW
Output Impedance (RXOUT, TXOUT)
—
1.0
—
kW
Input Logic 1 Voltage
Input Logic 0 Voltage
1
1
70%
—
—
—
—
VDD
VDD
30%
Dynamic Values
General
Analogue Signal Input Levels
Analogue Output Noise
-16.0
—
—
3
dB
4
2.5
5.0
mVRMS
Clear Mode
Passband -3dB Cutoff Frequencies
Low
—
—
—
300
—
Hz
Hz
High
3000
Passband Ripple (300-3000Hz)
Rx Channel
0
0
—
—
3.6
2.9
dB
dB
Tx Channel
Passband Ripple (500-2750Hz)
Rx Channel
0
0
—
—
2.2
2.0
dB
dB
Tx Channel
Filter Attenuation at 3.3 kHz
Rx and Tx Channel
—
—
30
45
—
—
dB
dB
Filter Attenuation at 3.6 kHz
Rx and Tx Channel
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
Notes
Min.
Typ.
Max
Units
Passband Gain (@1kHz ref.)
Rx and Tx Channel
-1.5
—
0.5
dB
Switched-Capacitor Filter Sampling
—
—
211.066
3298
—
—
kHz
Hz
Carrier Frequency
Invert Mode Combined Tx and Rx Response
Passband -3dB Cutoff Frequencies
Low
—
—
—
400
—
Hz
Hz
High
2800
Passband Gain
-3
—
—
1.75
-1.5
—
0.5
2.75
0
dB
%
Distortion (@1kHz)
3
5
Passband Gain (@1kHz ref.)
Low Frequency Roll-off (<200 Hz)
-2.5
12
dB
—
dB/oct.
Invert Mode Single Channel Response
Unwanted Modulation Products
Rx and Tx Channel
3
3
3
—
—
—
-40
-55
-40
—
—
—
dB
dB
dB
Carrier Breakthrough
Rx and Tx Channel
Baseband Breakthrough
Rx and Tx Channel
Operating Characteristics Notes:
1. Batch sampled only
2. By characterisation only
3. Measured with Input Level 0dB
4. Short circuit Rx or Tx input, measure noise at corresponding analogue output, in 30kHz bandwidth
5. Op Amp gain 0dB
6. Clear mode only
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
1.7.2 Packaging
Figure 4: 16-pin SOIC Mechanical Outline: Order as part no. FX128D4 or MX128DW
Figure 5: 16-pin PDIP Mechanical Outline: Order as part no. FX128P3 or MX128P
ã 2003 CML Microsystems Plc
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D/128/2
Audio Band Scrambler
FX/MX128
Figure 6: 16-pin TSSOP Mechanical Outline: Order as part no. FX128E4 or MX128E4
Handling precautions: This product includes input protection, however, precautions should be taken to prevent device damage
from electro-static discharge. CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit
patent licences are implied. CML reserves the right at any time without notice to change the said circuitry and this product
specification. CML has a policy of testing every product shipped using calibrated test equipment to ensure compliance with this
product specification. Specific testing of all circuit parameters is not necessarily performed.
www.cmlmicro.com
For FAQs see: www.cmlmicro.com/products/faqs/
For a full data sheet listing see: www.cmlmicro.com/products/datasheets/download.htm
For detailed application notes: www.cmlmicro.com/products/applications/
Oval Park, Langford, Maldon,
Essex,
CM9 6WG - England.
4800 Bethania Station Road,
Winston-Salem,
NC 27105 - USA.
No 2 Kallang Pudding Road,
#09 to 05/06 Mactech
Industrial Building,
No. 218, Tian Mu Road
West, Tower 1, Unit 1008,
Shanghai Kerry Everbright
City, Zhabei,
Singapore 349307
Shanghai 200070,
China.
Tel: +44 (0)1621 875500
Fax: +44 (0)1621 875600
Tel: +1 336 744 5050,
800 638 5577
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Tel: +65 6745 0426
Fax: +65 6745 2917
Tel: +86 21 6317 4107
+86 21 6317 8916
Fax: +86 21 6317 0243
Sales:
sales@cmlmicro.com
Sales:
us.sales@cmlmicro.com
Sales:
sg.sales@cmlmicro.com
Sales:
cn.sales@cmlmicro.com.cn
Technical Support:
techsupport@cmlmicro.com
Technical Support:
us.techsupport@cmlmicro.com
Technical Support:
sg.techsupport@cmlmicro.com
Technical Support:
sg.techsupport@cmlmicro.com
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