Datasheet MX465DS, MX465DW, MX465J, MX465LH, MX465P Datasheet (MX COM)

DATA BULLETIN

MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

LOW VOLTAGE
CTCSS ENCODER/DECODER

with Tx and Rx Audio Filters

Features Applications



Meets TIA/EIA-603 Standards



47 CTCSS Tones + Notone



TX/RX Speech Filters



Improved Sinad



Serial or Parallel Programming



Easy µP Interface



Scanning on any Channel



Standard 4MHz Xtal
(See MX165C for 1MHz)



Low Voltage 3.3V to 5.0V



Mobile Radio Channel Sharing



Scan Trunking



Wireless Intercom Traffic Control



Hookswitch Supervision



Repeater Control

DIGITAL

INTERFACE

AND

CLOCK

GENERATION

+

+

+

-

-

-

LOAD/
D5/SERIAL ENABLE 1

D3/SERIAL DAT A IN
D2/SERIAL CLOCK

LATC H

D4/SERIAL ENABLE 2

D1
D0

RX/
PTL

TX

DECODE COMPARATOR REF.
DECODE COMPARATOR IN

RX TONE DETECT

RX TONE DECODE

TX TONE OUT

TONE DETECT

LOGIC

TONE

ROM

48 x 10

RX AUDIO OUT

TX AUDIO OUT

TONE

f

300Hz

TONE IN

RX AUDIO IN

TX AUDIO IN

XTAL/CLK

XTAL

A0-A5

D0-D10

CLK

CLKS

CLKS

CLKS/XTAL

CLKS/XTAL

REFERENCE
VOLTAGE

TONE IN

FILTER

TONE DECODE

FILTER

TONE OUT FILTER

AUDIO FILTER

V
V
V

DD
SS
BIAS

The MX465 CTCSS Encoder/Decoder is a low voltage, CMOS device that meets TIA/EIA-603 Standards.
The MX465 will encode and decode the tones 159.8Hz, 183.5Hz, 189.9Hz, 196.6Hz, 199.5Hz, 206.5Hz,

229.1Hz, and 254.1Hz in addition to the 39 standard CTCSS tones, for a total of 47 CTCSS tones + Notone.
With the incorporation of the on-chip TX and RX speech filter, the MX465 enhances voice/tone multiplexing by
attenuating TX and RX speech 36dB at frequencies below 250Hz while passing signals > 300Hz with only
1dB of ripple. This not only minimizes CTCSS talk-off in the TX mode but also improves Hum and Noise
performance in the RX mode.

Available in the following package styles: 24-pin TSSOP (MX465TN), 24-pin SSOP (MX465DS),
24-pin SOIC (MX465DW), 24-pin PLCC (MX465LH), 24-pin PDIP (MX465P), and 24-pin CDIP (MX465J) the
MX465 requires a single 3.3V to 5.0V supply and a 4MHz clock or crystal.

Low Voltage CTCSS Encoder/Decoder 2 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

CONTENTS

Section Page

1. Block Diagram.................................................................................................................3

2. Signal List........................................................................................................................4

3. External Components..................................................................................................... 6

4. General Description........................................................................................................7

4.1 Description ............................................................................................................................. 7

4.2 I/O Conditions......................................................................................................................... 7

4.3 Filter Response...................................................................................................................... 8

4.4 Serial and Parallel Mode Timing ............................................................................................ 8

4.5 CTCSS Programming...........................................................................................................10

5. Performance Specification........................................................................................... 11

5.1 Electrical Performance......................................................................................................... 11

5.1.1 Absolute Maximum Ratings........................................................................................................11

5.1.2 Operating Limits..........................................................................................................................12

5.2 Packaging............................................................................................................................. 14

MX-COM, Inc. Reserves the right to change specifications at any time and without notice

Low Voltage CTCSS Encoder/Decoder 3 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

1 Block Diagram

DIGITAL

INTERFACE

AND

CLOCK

GENERATION

+

+

+

-

-

-

LOAD/
D5/SERIAL ENABLE 1

D3/SERIAL DATA IN
D2/SERIAL CLOCK

LATCH

D4/SERIAL ENABLE 2

D1
D0

RX/
PTL

TX

DECODE COMPARATOR REF.
DECODE COMPARATOR IN

RX TONE DETECT

RX TONE DECODE

TX TONE OUT

TONE DETECT

LOGIC

TONE

ROM

48 x 10

RX AUDIO OUT

TX AUDIO OUT

TONE

f

300Hz

TONE IN

RX AUDIO IN

TX AUDIO IN

XTAL/CLK

XT AL

A0-A5

D0-D10

CLK

CLKS

CLKS

CLKS/XTAL

CLKS/XTAL

REFERENCE
VOLTAGE

TONE IN

FILTER

TONE DECODE

FILTER

TONE OUT FILTER

AUDIO FIL TER

V
V
V

DD
SS
BIAS

Figure 1 : Block Diagram

Low Voltage CTCSS Encoder/Decoder 4 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

2 Signal List

Pin No. Signal Type Description

1V

DD

power Positive supply. This pin should be bypassed to VSS by

a capacitor mounted close to the device pins.

2 XTAL/CLOCK input Input to the on-chip inverter used with a 4 MHz Xtal or

external clock source.

3

XTAL

output Output of the on-chip inverter (clock output).

4

LATCH/LOAD

input Controls 8 on-chip latches. It is used to latch

TX/RX

,
PTL, and D0-D5. A logic 1 applied to this input places the
8 latches in the ‘transparent’ mode. A logic 0 applied to
this input places the 8 latches in the ‘latched’ mode. In
Parallel Mode, data is loaded and latched by a logic 1-0
transition (see Figure 4). In Serial Mode, data is loaded
and latched by a 0-1-0 strobe pulse on this pin (see
Figure 5). Internally pulled to V

DD

5 D5 / SERIAL ENABLE 1 input Data input D5 (Parallel Mode). A logic 1 applied to this

input together with a logic 0 applied to

D4/SERIAL ENABLE 2

will place the device in Serial

Mode (see Figure 5). Internally pulled to V

DD

.

6

D4 / SERIAL ENABLE 2

input Data input D4 (Parallel Mode). A logic 0 applied to this

input together with a logic 1 applied to D5 / SERIAL
ENABLE 1 will place the device in Serial Mode
(see Figure 5). Internally pulled to V

DD

.

7 D3 / SERIAL DATA IN input Data input D3 (Parallel Mode). In Serial Mode this pin

becomes the serial data input for D5-D0,

TXRX/

and PTL
(see Figure 5). D5 is clocked first and PTL last.
Internally pulled to V

DD

.

8 D2 / SERIAL CLOCK input Data input D2 (Parallel Mode). In Serial Mode this pin

becomes the SERIAL CLOCK input. Data is clocked on
the positive going edge (see Figure 5). Internally pulled
to V

DD

.

9 D1 input Data input D1 (Parallel Mode). Internally pulled to VDD.
10 D0 input Data input D0 (Parallel Mode). Internally pulled to VDD.
11 V

SS

power Negative supply.

12 DECODE COMPARATOR

REF.

input Internally biased to VDD/3 or 2 VDD/3 via 1M resistors

depending on the logic state of the

RX TONE DECODE

pin.

RX TONE DECODE

= 1 will

bias this input 2 V

DD

/3; a logic 0 will bias this input VDD/3.
This input provides the DECODE COMPARATOR
REFERENCE voltage, and the switching of bias voltages
provides hysteresis to reduce ‘chatter’ under marginal
conditions.

13

RX TONE DECODE

output Gated output of the decode comparator. This output is

used to gate the RX Audio path. A logic 0 on this pin
indicates a successful decode and the DECODE
COMPARATOR IN pin is more positive than the
DECODE COMPARATOR REF. input (see Table 3).

14 DECODE COMPARATOR IN input Inverting input of the DECODE COMPARATOR. This pin

is normally connected to the integrated output of the RX
TONE DETECT line.

15 RX TONE DETECT output In RX mode this output will go to logic 1 during a

successful decode. It must be externally integrated to
control response and deresponse times (see Table 3).

Low Voltage CTCSS Encoder/Decoder 5 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Pin No. Signal Type Description

16 TX TONE OUT output The CTCSS sinewave output appears on this pin under

control of the

TXRX/

pin. When not transmitting a tone,

TX TONE OUT may be biased to V

DD

/2. (see Table 3).

17

TXRX/

input RX or TX modes selected in Parallel Mode (see Figure

4). In Serial Mode this function is serially loaded. This
pin is internally pulled to V

DD

via a 1M resistor.

18 PTL input In RX mode this pin operates as a ‘Push To Listen’

function by enabling the RX audio path, thus overriding
the tone squelch function (Parallel Mode). In Serial Mode
this function is loaded serially. Internal pull-up to V

DD

19 RX AUDIO OUT output High pass filtered RX AUDIO OUT. This pin outputs

audio when

RX TONE DECODE

= logic 0, PTL = logic 1,
or when Notone is programmed (see Table 4). In TX
mode this pin is biased to V

DD

/2.

20 TX AUDIO OUT output High pass filtered TX AUDIO OUT pin. In TX mode this

pin outputs audio present at the TX AUDIO IN pin. In RX
mode this pin is biased to V

DD

/2

21 V

BIAS

output Output of an internally generated VDD /2 bias level that

would normally be externally bypassed to V

SS

via

capacitor C6.

22 TX AUDIO IN input In TX mode TX AUDIO IN may be prefiltered, using the

TX Audio path, thus helping to avoid talk-off due to
intermodulation of speech frequencies with the
transmitted CTCSS tone. Internally biased to V

DD

/2.

23 RX AUDIO IN input Input to the audio high pass filter in RX mode. Internally

biased to V

DD

/2.

24 TONE INPUT input Input to the CTCSS tone detector. Internally biased to

V

DD

/2.

Table 1: Signal List

Low Voltage CTCSS Encoder/Decoder 6 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

3 External Components

1
2
3
4
5
6
7
8
9
10
11
12

13

24
23
22
21
20
19
18
17
16
15
14

TONE IN
RX AUDIO IN
TX AUDIO IN
V

BIAS

TX AUDIO OUT
RX AUDIO OUT
PTL
RX / TX
TONE OUT
RX TONE DETECT
DECODE COMPARATOR IN
RX TONE DECODE

XTAL/CLK

XTAL

LOAD / LATCH

D5/SERIAL ENABLE 1

D4/SERIAL ENABLE 2

D3/SERIAL DATA IN

D2/SERIAL CLOCK

D1

D0

V

SS

DECODE COMPARATOR REF.

V

DD

MX465

C4

C5

D1

C6

C11

C7

C10

R1X1

C2

C1

C3

R3

C9

C8

R2

V

DD

Figure 2 : Recommended External Components for Typical Application

R1 Note 1

1.0M



10%

C6

0.47F



20%

R2

560k



10%

C7 Note 2

0.1F



20%

R3

820k



10%

C8 Note 2

0.1F



20%

C1

0.1F20%

C9 Note 2

0.1F



20%

C2 Note 1 18pF



20%

C10 Note 2

0.1F



20%

C3 Note 1 33pF



20%

C11 Note 2

0.1F



20%

C4 Note 2

0.1F20%

D1 small signal

C5 Note 2

0.1F20%

X1 Note 1 4MHz 100ppm max.

Table 2: External Components

External Components Notes:

1. The values specified for R1, C2, and C3 have been found to be satisfactory when used with a crystal
(X1) whose equivalent series resistance is  1000. For best results, a crystal oscillator design should
drive the clock inverter input with signal levels of at least 40% of V

DD

, peak to peak. Tuning fork
crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult
your crystal manufacturer.

2. The 0.1F value for the DC Blocking capacitors, C4, C5, C7, C8, C9, C10, and C11 is not a
requirement. For the capacitors C4, C5, and C10, the input impedance is internal to the device and
specified typical as 550k. For the remaining capacitors external circuits will be important in
determining the input impedance.

Low Voltage CTCSS Encoder/Decoder 7 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

4 General Description

4.1 Description

Voice on shared radio channels are multiplexed with a subaudible CTCSS (Continuous Tone Controlled
Subaudible Squelch) tone as a means of directing messages among user groups sharing the same RF
frequencies. CTCSS modulates the transmitter with a discrete tone, from 39 standard CTCSS tones in the
range (67.0Hz to 250.0Hz) according to TIA/EIA-603. There are an additional eight CTCSS tones not
specified in TIA/EIA-603 that the MX465 will encode and decode. They are : 159.8Hz, 183.5Hz, 189.9Hz,

196.6Hz, 199.5Hz, 206.5Hz, 229.1Hz, and 254.1Hz, for a total of 47 CTCSS tones plus Notone.
The MX465 also incorporates TX/RX on chip speech filters. In early CTCSS designs, TX speech was not

filtered from the CTCSS tone, rather the filtering was dependent upon the host transmitter’s pre-emphasis
network. At only 6dB/octave, the attenuation of speech components at higher CTCSS tones was only a few
dB which resulted in talk-off (low frequency voice components unsquelching the receiver audio).

4.2 I/O Conditions

D0-D5

Tone No Tone Tone Tone Tone No Tone

Input Pins Condition

RX TX/

001111

PTL 0 X 0 1 X X
Decode Comparator In X X 0 0 1 X

Output Pins Condition

RX TONE DETECT 00001X

RX TONE DECODE

111100

Result / Function

Tone Transmitter Enabled Yes No (Bias) No (Bias) No (Bias) No (Bias) No (Bias)
TX Audio Path Enabled Yes Yes No No No No
Tone Decode Enabled No No Yes Yes Yes Yes
RX Audio Path Enabled No (Bias) No (Bias) No (Bias) Yes Yes Yes

Notes 123456

Notes:

1. Normal tone transmit condition.

2. Notone programmed in TX mode, tone transmit output set to V

DD

/2. TX audio path enabled.

3. Normal decode standby.

4. Normal decode standby with PTL used to enable audio.

5. Normal decode of correct CTCSS tone condition, PTL has no effect.

6. Notone programmed in RX mode, tone transmit output (Bias). RX audio path enabled.

7. X =don’t care

Table 3: Combinations of Input / Output conditions

Low Voltage CTCSS Encoder/Decoder 8 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

4.3 Filter Response

0

-10

-20

-30

-40

-50

-60

-70

Gain (dB)

Frequency (Hz)

CTCSS Frequencies

V oiceband Frequencies

100

200

300

400

250.3

-33

Figure 3 : Voiceband Filter Response

4.4 Serial and Parallel Mode Timing

t

L

t

SP

D0-D5

RX/TX, PTL

LOAD/LATCH

Figure 4 : Parallel Mode

Low Voltage CTCSS Encoder/Decoder 9 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

1

1

1

0

0

0

0

D5

D4

D3

D2

t

C

t

SS

t

1

DA TA D5 DA TA D4

D3

PTL

t

H

LOAD DATA

SERIAL
ENABLE

DA T A
(Note)

SERIAL
CLOCK

RX/TX

t

2

L/L

DA T A
LATCHED

LATCH DATA

LOAD/
LATCH

t

L

D1

D0

DON'T CARE - 1M PULL UPΩ

DON'T CARE - 1M PULL UPΩ

DON'T
CARE

Note : Serial bit 1 through bit 8 = D5, D4, D3, D2, D1, D0, RX/TX and PTL respectively . Load bit 1 first, bit 8 last

Figure 5 : Serial Mode

Low Voltage CTCSS Encoder/Decoder 10 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

4.5 CTCSS Programming

Tone Programming Inputs

Nominal

Frequency (Hz)

MX465

Frequency

(Hz)



f0 (%)

D5 D4 D3 D2 D1 D0 Hex

67.0 66.98 -0.029 1 1 1 1 1 1 3F

69.3 69.32 0.024 1 1 1 0 0 1 39

71.9 71.901 0.001 0 1 1 1 1 1 1F

74.4 74.431 0.042 1 1 1 1 1 0 3E

77.0 76.965 -0.046 0 0 1 1 1 1 0F

79.7 79.677 -0.029 1 1 1 1 0 1 3D

82.5 82.483 -0.021 0 1 1 1 1 0 1E

85.4 85.383 -0.020 1 1 1 1 0 0 3C

88.5 88.494 -0.007 0 0 1 1 1 0 0E

91.5 91.456 -0.048 1 1 1 0 1 1 3B

94.8 94.76 -0.042 0 1 1 1 0 1 1D

97.4 97.435 -0.036 1 1 1 0 1 0 3A

100.0 99.96 -0.040 0 0 1 1 0 1 0D

103.5 103.429 -0.069 0 1 1 1 0 0 1C

107.2 107.147 -0.05 0 0 1 1 0 0 0C

110.9 110.954 0.049 0 1 1 0 1 1 1B

114.8 114.84 0.035 0 0 1 0 1 1 0B

118.8 118.793 -0.006 0 1 1 0 1 0 1A

123.0 123.028 0.023 0 0 1 0 1 0 0A

127.3 127.328 0.022 0 1 1 0 0 1 19

131.8 131.674 -0.095 0 0 1 0 0 1 09

136.5 136.612 0.082 0 1 1 0 0 0 18

141.3 141.323 0.016 0 0 1 0 0 0 08

146.2 146.044 -0.107 0 1 0 1 1 1 17

151.4 151.441 0.027 0 0 0 1 1 1 07

156.7 156.875 0.112 0 1 0 1 1 0 16

• 159.8 159.936 0.085 1 1 0 0 0 1 31

162.2 162.311 0.069 0 0 0 1 1 0 06

167.9 167.708 -0.114 0 1 0 1 0 1 15

173.8 173.936 0.078 0 0 0 1 0 1 05

179.9 179.654 -0.137 0 1 0 1 0 0 14

• 183.5 183.680 0.098 1 1 0 0 1 0 32

186.2 186.289 0.048 0 0 0 1 0 0 04

• 189.9 190.069 0.089 1 1 0 0 1 1 33

192.8 192.864 0.033 0 1 0 0 1 1 13

• 196.6 196.329 -0.138 1 1 0 1 0 0 34

• 199.5 199.312 -0.094 1 1 0 1 0 1 35

203.5 203.645 0.071 0 0 0 0 1 1 03

• 206.5 206.207 -0.142 1 1 0 1 1 0 36

210.7 210.848 0.070 0 1 0 0 1 0 12

218.1 217.853 -0.113 0 0 0 0 1 0 02

Low Voltage CTCSS Encoder/Decoder 11 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Tone Programming Inputs

Nominal

Frequency (Hz)

MX465

Frequency

(Hz)



f0 (%)

D5 D4 D3 D2 D1 D0 Hex

225.7 225.339 -0.160 0 1 0 0 0 1 11

• 229.1 229.279 0.078 1 1 0 1 1 1 37

233.6 233.359 -0.103 0 0 0 0 0 1 01

241.8 241.970 0.070 0 1 0 0 0 0 10

250.3 250.282 -0.007 0 0 0 0 0 0 00

• 254.1 254.162 0.024 1 1 1 0 0 0 38

Notone N/A 1 1 0 0 0 0 30

Serial input mode N/A 1 0 Data Clock X X 2X

• Not specified in the TIA/EIA tone set

Table 4: CTCSS Tones

5 Performance Specification

5.1 Electrical Performance

5.1.1 Absolute Maximum Ratings

Exceeding these maximum ratings can result in damage to the device. Operation of the device outside the
operating limits is not implied.

General Min. Max. Units

Supply (VDD - VSS) -0.3 7.0 V
Voltage on any pin to V

SS

-0.3 V

DD

+ 0.3 V

Current

V

DD

-30 30 mA

V

SS

-30 30 mA

any other pins -20 20 mA

TN / DW / LH / DIP Package

Total Allowable Power Dissipation at T

AMB

=25°C 800 mW

Derating above 25°C 10 mW/°C above 25°C
Storage Temperature -55 125 °C
Operating temperature - 40 85 °C

DS Package

Total Allowable Power Dissipation at T

AMB

=25°C 550 mW

Derating above 25°C 9 mW/°C above 25°C
Storage Temperature -55 125 °C
Operating temperature - 40 85 °C

Low Voltage CTCSS Encoder/Decoder 12 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

5.1.2 Operating Limits

Correct operation of the device outside these limits is not implied.

Min. Max. Units

Supply (VDD-VSS)2.75.5V

Xtal Frequency 4.0 4.0 MHz

Operating Temperature -40 85 °C

5.1.3 Operating Characteristics

For the following conditions unless otherwise specified:

V

DD

= 3.3V / 5.0V at T

AMB

= 25°C, V

SS

= 0V,
Xtal Frequency = 4.0 MHz, 100ppm max.
(Over the life of the XTAL the operating range may vary from 100ppm up to 1000ppm)
0dB ref. = 750mV

RMS

(proportional to VDD; see note 17)

Composite Signal

:

1kHz test tone = 300mV

RMS

, f0 CTCSS tone = 30 mV

RMS

, 75mV

RMS

Noise (band limited to 6kHz

Gaussian)

Notes Min. Typ. Max. Units

Static Values

Supply voltage 2.7 3.3/5.0 5.5 V
Supply current

VDD = 5.0V 3.7 4.2 mA
VDD = 3.3V 1.3 1.6 mA

Analog input impedance 18 480 550

k



Analog output impedance 18 400 1000



Digital Input impedance 1,18 25 40

k



Input logic 1 1 70%V

DD

V

Input logic 0 1 30%V

DD

V

Output Logic 1 source = 0.1mA 2 80%V

DD

V

Output Logic 0 sink = 0.1mA 2 20%V

DD

V

Dynamic Values

Speech filter

Total harmonic distortion 5,8,19 1.0 1.5 %
Output noise level (input AC short

circuit, audio switch enabled)

8,18 0.5 1.0 mV

RMS

Sinad 8,9 40 50 dB
Spurious emissions 18 - 48 dB
Cutoff frequency 300 Hz
Bandpass ripple 8 1 1.8 dB
Stopband attenuation <250Hz 7,8,19 33 36 dB
Passband gain 1kHz - 0.5 0 0.5 dB
TX/RX isolation 5 60 dB

Low Voltage CTCSS Encoder/Decoder 13 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Notes Min. Typ. Max. Units

Encoder

Tone output level 12 - 1.0 0 1.0 dB
Tone Frequency Accuracy (f error) - 0.3 0.3 %f

0

Risetime to 90% nominal output

f0>100Hz 4,10 15 75 ms
f0<100Hz 4,10 45 120 ms

Total Harmonic Distortion 19 1.5 2 %

Decoder

Pure tone decode threshold 19 7 15 mV

RMS

Composite signal decode threshold 3 30 mV

RMS

Decode input signal level 16 -20 3.5 dB
Pure tone decode response time 13,14 95 115 140 ms
Pure tone decode deresponse time 13,15 95 130 170 ms
Decode response time 3,6,10 250 ms
Deresponse time 3,10 180 250 ms

Decode selectivity:

Upper decode band edge 3,11,19,20 1.005f

0

1.015f

0

0.995f

0+1

Hz

Lower decode band edge 3,11,19,20 1.005f

0-1

0.985f

0

0.995f

0

Hz

Serial / Parallel Inputs

Parallel Set Up Time (tSP) 400 ns
Load / Latch Pulse Width (tL) 400 ns
Serial Clock Pulse Width (tC) 400 ns
Serial Data Set-Up Time (tSS) 400 ns
Serial Data Hold Time (tH) 400 ns
Serial Enable Time (t1) 400 ns
Serial Load / Latch Set-Up Time (t2) 400 ns
Serial Clock Frequency 1 MHz

Operating Characteristics Notes:

1. Refers to RX/TX, PTL, Decode Comparator Input, D0-D5.

2. All logic outputs.

3. Composite signal test condition.

4. Any programming tone and R

L

= 10k, CL = 15pF.

5. With an input level of 0dB @1kHz

6. f

0

>100Hz (for 100 Hz> f0>67Hz: t=100/ f0Hz x 250ms)

7. See Figure 3.

8. Measured in a 30kHz bandwidth.

9. With an input level of -3.5dB @1kHz

10. Per TIA/EIA-603.

11. Per TIA/EIA-603, device will not decode adjacent TIA/EIA-603 Tones.

12. Tone output level is proportional to V

DD

.

13. f

0

=156.7Hz @ -20dB.

14. Typically 12.5 Tone Cycles + 40ms.

15. Typically 7 Tone Cycles + 90ms.

Low Voltage CTCSS Encoder/Decoder 14 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

16. Max composite signal is 3.5dB with:
Noise (band limited 6kHz Gaussian) = -12dB ref to 1kHz test tone
f

0

CTCSS tone = -20dB ref to 1kHz test tone

17. For maximum dynamic range, set audio level to 0dB, V

DD

x150mV

RMS

, using minimum VDD under

which system is intended to work. (e.g. for a 2.7V system, use 0dB equal to 405mV

RMS

).

18. By characterization only.

19. Batch sampled only

20. For example, if: f

0

= 100.0Hz (f

0-1

= 97.4Hz f

0+1

= 103.5Hz)

Decode Selectivity Min Typ Max Unit

Upper Decode Band Edge 100.5 101.5 102.98 Hz
Lower Decode Band Edge 97.89 98.5 99.5 Hz

5.2 Packaging

PIN 1

A

B

ALTERNATIVE

PIN
LOCATION
MARKING

E

L

T

P

J

Y

C

H

0.303 (7.70)

PackageTolerances

TYP. MAX.MIN.

A
B
C
E
H

DIM.

J
P
Y

T

L

0.047 (1.20)----------

0.256 (6.50)

0° 8°

0.030 (0.75)

0.311 (7.90)

0.177 (4.50)

0.0256 (0.65)

0.020 (0.50)

0.248 (6.30)

0.006 (0.15)0.002 (0.05)

0.003 (0.08) 0.008 (0.20)

0.007 (0.17) 0.012 (0.30)

0.169 (4.30)

NOTE: All dimensions in inches (mm.)

Angles are in degrees

Figure 6: 24-pin TSSOP Mechanical Outline: Order as part no. MX465TN

NOTE: All dimensions in inches (mm.)

Angles are in degrees

PackageTolerances

A
B
C
E
H

TYP.

MAX.MIN.

DIM.

J
P
X

T
Y

Z

L

0.079 (2.00)0.066 (1.67)

0.312 (7.90)

0°
7°
4°

8°
9°

10°

0.037 (0.95)

0.328 (8.33)

0.213 (5.39)

0.026 (0.65)

0.022 (0.55)

0.301 (7.65)

0.008 (0.21)0.002 (0.05)

0.005 (0.13) 0.009 (0.22)

0.010 (0.25) 0.015 (0.38)

0.318 (8.07)

0.205 (5.20)

X

C

H

P

J

Y

E

Z

L

T

PIN 1

A

B

Figure 7: 24-pin-SSOP Mechanical Outline:

Order as part no. MX465DS

Low Voltage CTCSS Encoder/Decoder 15 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

0.597 (15.16)

PackageTolerances

A
B
C
E

H

TYP. MAX.MIN.DIM.

J

P

X

W

T

Y

K
L

0.105 (2.67)

0.093 (2.36)

0.419 (10.64)

45°

7°

0°

10°

0.050 (1.27)

0.046 (1.17)

0.613 (15.57)

0.299 (7.59)

0.050 (1.27)

0.016 (0.41)

0.390 (9.90)

0.020 (0.51)0.003 (0.08)

0.009 (0.23)

0.0125 (0.32)

0.013 (0.33)

0.020 (0.51)

0.036 (0.91)

0.286 (7.26)

Z

NOTE: All dimensions in inches (mm.)

Angles are in degrees

5°

5°

PIN 1

A

B

ALTERNATIVE

PIN

LOCATION

MARKING

X

P

J

Y

C

H

K

E

L

T

W

Z

Figure 8: 24-pin SOIC Mechanical Outline:

Order as part no. MX465DW

PackageTolerances

NOTE: All dimensions in inches (mm.)

Angles are in degrees

A
B
C
D
E

H

P

F
G

TYP. MAX.MIN.DIM.

K

J

W

T
Y

0.435 (11.05)

0.435 (11.05)

0.051 (1.30)

0.009 (0.22)

6°

30°

0.409 (10.40)

0.409 (10.40)

0.146 (3.70)

0.417 (10.60)

0.417 (10.60)

0.049 (1.24)

0.006 (0.152)

0.250 (6.35)

0.250 (6.35)

0.023 (0.58)

0.047 (1.19)

0.022 (0.55)0.018 (0.45)

0.380 (9.61)

0.380 (9.61)

0.128 (3.25)

0.048 (1.22)

45°

F

G

P

A

D

B

E

PIN 1

W

C

J

K

Y

W

H

T

Figure 9: 24-pin PLCC Mechanical Outline:

Order as part no. MX465LH

Low Voltage CTCSS Encoder/Decoder 16 MX465

©1998 MX•COM, INC. www.mxcom.com Tel: [phone] 744 5050 Fax: [phone] Doc. #20480143.008

4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

NOTE: All dimensions in inches (mm.)

Angles are in degrees

PackageTolerances

A
B
C
E

E1

F
H

TYP. MAX.MIN.

DIM.

J

J1

P
T

K1

K
L

0.230 (5.84)

0.583 (14.79)

0.670 (17.00)

0.200 (5.08)

1.260 (32.00)

0.165 (4.19)

0.10 (2.54)

0.115 (2.92)

0.600 (15.23)

0.594 (15.09) 0.615 (15.61)

1.100 (27.94)

0.0106 (0.269)

0.018 (0.46)

0.055 (1.39)

0.050 (1.27)

0.074 (1.88)

0.080 (2.03)

0.080 (2.03)

1.240 (31.50)

0.514 (13.06)

B

A

PIN1

H

H

K

K

L

L

F

J1

J

P

C

K1

T

E

E1

0.02 (0.51)

0.0094 (0.239)

Figure 10: 24-pin-CDIP Mechanical Outline:

Order as part no. MX465J

NOTE: All dimensions in inches (mm.)

Angles are in degrees

PackageTolerances

A
B

C

E

E1

H

TYP. MAX.MIN.DIM.

J

J1

P
Y

T

K

L

0.220 (5.59)

0.555 (14.04)

0.670 (17.02)

7°

0.160 (4.05)

1.270 (32.26)

0.151 (3.84)

0.100 (2.54)

0.121 (3.07)

0.600 (15.24)

0.590 (14.99) 0.625 (15.88)

0.015 (0.38) 0.045 (1.14)

0.008 (0.20) 0.015 (0.38)

0.015 (0.38) 0.023 (0.58)

0.040 (1.02) 0.065 (1.65)

0.066 (1.67) 0.074 (1.88)

1.200 (30.48)

0.500 (12.70)

H

K
L

J1J1

JJ

PP

CC

BB

AA

PIN1PIN1

TT

EE

E1E1

Y

Figure 11: 24-pin PDIP Mechanical Outline:

Order as part no. MX465P