CMLMICRO MX014

DATA BULLETIN
MX014
Voice Band inverter
TX Audio In
BIAS
6dB/Octave
Pre-emphasis
10dB Gain
Rx Path
RX Audio In
Path Invert
6dB/Octave
De-emphasis
Bandpass
Filter
300-3033 Hz
Filsav 1
Bandpass
Filter
300-3033 Hz
Carrier
TX Buffer In
Filter
TX Audio Feedback
DEEMP Out
• Land Mobile Radio Systems
• Community Repeaters
RX Buffer In
• CTCSS Compatible
• Fixed Frequency Inversion
• Low Power CMOS
BPF Out
Applications
BALMOD
Features
TX
TX Audio Out
TX
Filsav 1
BIAS
RX Path
RX Audio Out
Filsav 2
RX Audio Feedback
RX Path
Clock
3333 Hz
Carrier
PTT
Filsav 1
PTT
RX Audio Enable
RX Audio Enable
PTL
PTL
Privacy Enable
CLK
3333 Hz
Clock
CLK Generator
Filsav 2
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
TX Audio In
BIAS
6dB/Octave
Pre-emphasis
10dB Gain
Rx Path
RX Audio In
Bandpass
Filter
300-3033 Hz
Filsav 1
Bandpass
Filter
300-3033 Hz
Carrier
TX Buffer In
6dB/Octave
De-emphasis
DEEMP Out
Path Invert
RX Buffer In
TX Audio Feedback
BPF Out
Filter
BALMOD
1. Block Diagram
TX
TX Audio Out
TX
Filsav 1
BIAS
RX Path
RX Audio Out
Filsav 2
RX Audio Feedback
RX Path
Clock
3333 Hz
Carrier
PTT
Filsav 1
PTT
RX Audio Enable
RX Audio Enable
PTL
PTL
CLK
3333 Hz
Clock
CLK Generator
Filsav 2
LOGIC
RX Path
EMPSAV
TX
Path Invert
V DD
V SS
Privacy Enable
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.
Name
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.
Description
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.
3
PTT
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.
5
PTL
Push To Listen is an input with a 3MΩ pull-down resistor.
6
PTL
Push To Listen is 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 Enable is 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
VSS
13
BPFOUT
The negative supply pin (ground).
14
RXBIN
15
DEMPOUT
16
TXBIN
17
BIAS
This is the internally generated VDD/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
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
VDD
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 input to the balanced modulator. It must be a.c. coupled to the Filter Output.
The positive supply pin.
Table 1: Signal List
 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
For Use in Radios without
Pre- and De-emphasis.
Configuration for Radios with
Existing Pre- and De-emphasis.
X1
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
VDD
R1
C1
R3
R2
C2
R4
C3
19
18
17
16
15
14
13
X1
TX Channel
RX Channel
C4
R7
R5
R8
R6
Bias
Bias
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
VDD
R1
C1
R3
R2
C2
R4
C3
TX Channel
RX Channel
C4
R10
R11
R12
Bias
Bias
R9
Figure 2: External Components Connections
TX Attenuation =
R8
R7 + R8
For a gain of 1, R8 = ∞, R7 = 0
RX Attenuation =
R6
R5 + R6
For a gain of 1, R6 = ∞, R5 = 0
TX Attenuation =
R10
R9 + R10
For a gain of 1, R9 = 0, R10 = ∞
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.
 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
6dB/Octave
Pre-emphasis
10dB Gain
+
Path Invert
TX Audio Out
-6dB/Octave
De-emphasis
Bandpass
Filter
300-3033 Hz
BIAS
TX Buffer In
TX Audio In
TX Channel
DEEMP Out
R1
BALMOD
R2
Filter
TX Audio Feedback
C1
R7
TX
Bandpass
Filter
300-3033 Hz
Carrier
BIAS
C3
R6
RX Buffer In
Path Invert
BPF Out
BALMOD
Filter
R5
RX
BIAS
C2
+
RX Audio In -
R4
RX Channel
R3
RX Audio Feedback
Bandpass
Filter
300-3033 Hz
Bandpass
Filter
300-3033 Hz
RX Audio Out
Carrier
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
MX014
BIAS
R10
TX Audio In
TX Channel
6dB/Octave
Pre-emphasis
10dB Gain
+
TX Audio Out
TX
Bandpass
Filter
300-3033 Hz
BIAS
Path Invert
BPF Out
R2
R1
Filter
TX Audio Feedback
C1
BALMOD
C1
TX Buffer In
R9
Bandpass
Filter
300-3033 Hz
Carrier
BIAS
R12
-6dB/Octave
De-emphasis
+
RX Audio In -
R4
RX Channel
R3
RX Audio Feedback
Bandpass
Filter
300-3033 Hz
Bandpass
Filter
300-3033 Hz
RX Buffer In
Path Invert
BIAS
C2
DEEMP Out
R11
BALMOD
Filter
C3
RX
RX Audio Out
Carrier
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
Min.
Max.
Units
-0.3
7.0
V
-0.3
(VDD + 0.3 )
V
VDD
30
mA
VSS
30
mA
Any other pin
20
mA
800
mW
Supply Voltage
Input Voltage at any pin
(ref. VSS + 0 V)
Current:
J / P / LH Packages
Maximum Device Dissipation at TAMB = 25°C
10
mW/°C above 25°C
Operating Temperature Range:
Derating above 25°C
-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.
VDD
Min.
Typ.
Max.
Units
4.5
5.0
5.5
V
Clock Frequency
4.0
Operating Temperature
-40
MHz
85
°C
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
Min.
Typ.
Max
Units
RX/TX Operating (Private)
11.0
mA
RX/TX Operating (Clear)
8.0
mA
1.8
mA
Static Values
Supply Current:
Standby
4
Audio Input Impedance
Audio Output Impedance
Digital Output Impedance(Pulldown)
5
Input Logic “0”
MΩ
0.5
kΩ
1
Digital I/O Impedance
Input Logic “1”
10
MΩ
100
kΩ
70%
VDD
30%
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
9
Notes
MX014
Min.
Typ.
Max
Units
5
%
RX Clear Performance
Total Harmonic Distortion
1
2
Output Noise Level
2
2
mVRMS
0
dB
Passband Gain
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
Passband Ripple (300 - 3033 Hz)
3
mVRMS
4
dB
Stopband Attenuation
(fin > 3333 Hz)
50
dB
(fin > 3633 Hz)
60
dB
60
dB
Highpass Attenuation
(fin < 250 Hz)
TX Clear
Total Harmonic Distortion
1
2
5
%
Output Noise Level
2
2
mVrms
1
0
dB
Passband Gain
(fin = 300 - 3033 Hz)
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
1,3
4
%
2
4
mVrms
TX Inverted
Total Harmonic Distortion
Output Noise Level
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
Frequency Response
6
dB/Octave
Gain at 1 kHz
10
dB
Frequency response
-6
dB/Octave
Gain at 1 kHz
0
dB
Pre-Emphasis
De-emphasis
 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
C
Package Tolerances
K
Y
DA
W
T
PIN 1
P
G
F
J
W
H
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°
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
B
DIM.
A
B
C
E
E1
H
J
J1
K
L
P
T
Y
E
E1
Y
T
PIN1
K
H
L
C
J
J1
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
P
Figure 6: 24-pin PDIP Mechanical Outline: Order as part no. MX014P
A
Package Tolerances
DIM.
B
E
E1
T
PIN1
K
K1 C
H
L
J
J1
F
P
A
B
C
E
E1
F
H
J
J1
K
K1
L
P
T
MIN.
TYP.
MAX.
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)
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
CML Microcircuits
(USA) Inc.
CML Microcircuits
(Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
COMMUNICATION SEMICONDUCTORS
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