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DATA BULLETIN
MX375
Features
* PRIVATE/CLEAR CAPABILITY * ON-CHIP TX AUDIO PRE/DEEMPHASIS * ALTERNATIVE TO STANDARD CTCSS "PARTY LINE" * POWERSAVE OPTION
Pvt SQUELCHTM CTCSS Encoder/Decoder
Applications
* MOBILE RADIOS * COMMUNITY REPEATERS * TELEPHONE/RADIO INTERCONNECT SYSTEMS
TX TX Audio Input
6dB/Octave
TX
Filter Output
Balanced Modulator CLR Input
-6dB/Octave
TX Audio Output
RX BIAS RX RX Audio Input XTAL XTAL RX Tone Input Load/Latch D5 or Serial Enable 1 D4 or Serial Enable 2 D3 or Serial Data Input D2 or Serial Clock Input D1 Input D0 Input RX/TX Control Private Enable Push-To-Listen PTL 8-Bit Shift Register and Latches LD5-LD0 Logic Control fCARRIER NoTone Output fCLK1 VDD fCLK2 fEMPH RX Path VBIAS TX Path Private V
SS
fEMPH
fCLK1
fCARRIER fCLK2
fEMPH
PVT
BIAS TX
RX Audio Output
3333Hz
Reference
Hysteresis
Clocks
Filters
RX Tone Decoder Output Decode Comparator Input RX Tone Detect Output
CTCSS Tone Detect
3333 Hz
TX Tone Output
The MX375 is a CMOS LSI microcircuit which combines CTCSS Encode/Decode operation with voice band frequency inversion. Frequency inversion is achieved by modulating the input audio with a 3333 Hz carrier frequency. Higher voice band frequencies are translated downward, and lower frequencies upward, resulting in a "mirror image" voice transmission. PvtSQUELCHTM combines CTCSS with inverted speech to prevent users from understanding each other's communications unless the transmissions are accompanied by the group's assigned tone. Its net effect is to eliminate casual eavesdropping and give mobile radio users a certain degree of privacy at a minimal price. Up to 38 PvtSQUELCH user groups (one per CTCSS tone) can share a single radio channel. With PvtSQUELCH, competing businesses can share a radio channel without compromising communications security. Device features: 1) serial or parallel tone programming capability (serial or parallel offered on MX375J, P & LH8), 2) the ability to operate under NOTONE conditions, 3) on-chip Tx and Rx audio filtering, 4) pin-selectable Private/Clear operation, and 5) pre/deemphasis filters in the Tx path, for optimal recovered audio quality. A low-cost 4 MHz crystal/clock and a single 5V supply are required for operation. The MX375 is available in the following package styles: 28-pin PDIP (MX375P), 28-pin CDIP (MX375J) 28-pin PLCC (MX375LH8), and 24-pin PLCC (MX375LH).
(c) 1997 MX*COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054 Doc. # 20480026.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
PvtSQUELCHTM CTCSS Encoder/Decoder
2
MX375
CONTENTS
Section Page
1. Block Diagram .................................................................................................................................. 3 2. Signal List ......................................................................................................................................... 4 3. External Components ...................................................................................................................... 6 4. General Description ......................................................................................................................... 7
4.1.1 Pre- and De-emphasis .......................................................................................................................................7 4.1.2 Functions and Outputs.......................................................................................................................................7
5. Application ....................................................................................................................................... 8
5.1.1 CTCSS Programming ........................................................................................................................................8
6. Performance Specification.............................................................................................................. 9
6.1 Electrical Performance .............................................................................................................................. 9 6.2 Timing Information ................................................................................................................................... 12
6.2.1 Serial Loading ...................................................................................................................................................12 6.2.2 Parallel Loading ................................................................................................................................................13
6.3 Packaging ................................................................................................................................................ 13
MX*COM, Inc. reserves the right to change specifications at any time and without notice.
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
All trademarks and service marks are held by their respective companies.
Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
3
MX375
1. Block Diagram
Filter Output Balanced Modulator CLR Input
-6dB/Octave
TX TX Audio Input
6dB/Octave
TX
TX Audio Output
RX BIAS RX RX Audio Input XTAL XTAL RX Tone Input Load/Latch D5 or Serial Enable 1 D4 or Serial Enable 2 D3 or Serial Data Input D2 or Serial Clock Input D1 Input D0 Input RX/TX Control Private Enable Push-To-Listen PTL 8-Bit Shift Register and Latches LD5-LD0 Logic Control fCARRIER NoTone Output fCLK1 VDD fCLK2 fEMPH RX Path VBIAS TX Path Private V
SS
fEMPH
fCLK1
fCARRIER
fCLK2
fEMPH
PVT
BIAS TX
RX Audio Output
3333Hz
Reference
Hysteresis
Clocks
Filters
RX Tone Decoder Output Decode Comparator Input RX Tone Detect Output
CTCSS Tone Detect
3333 Hz
TX Tone Output
Figure 1: Device Block Diagram
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
2. Signal List
Pin No. LH 1 2 3 4 J,P,LH8 28 1 2 3 VDD XTAL/CLOCK XTAL LOAD/ LATCH power input output input 5V supply pin. This is the input to the clock oscillator inverter. An external 4 MHz Xtal or clock input should be applied to this pin. This is the 4 MHz output of the clock oscillator inverter. This input controls the eight input latches: RX/ TX , PrivateEnable , and D0-D5, as detailed in Table 5. Alternatively, the RX/ TX and PrivateEnable inputs can be addressed separately by setting the Load/ Latch and Control inputs as shown in Table 5. 1 M pullup. 5-7 D4-D2 input Programming Inputs (Serial Mode Only): These are the RX /TX tone programming and function inputs which enable the serial programming mode. With Load/ Latch at logic "0" serial data is loaded in the following sequence: D5, D4, D3, D2, D1, D0, RX/ TX , PrivateEnable . When these 8 bits have been clocked in on the rising clock edge, data is latched by strobing the Load/ Latch input "0 - 1 - 0" (See Figure 5). Pin 5 (D4) = Serial Enable2 Pin 6 (D3) = Serial Data Input Pin 7 (D2) = Serial Clock Input 4-9 D5-D0 input Parallel Programming Inputs: These are the RX/ TX tone programming and function inputs which select the CTCSS tone (See Table 4). For both Serial and Parallel Modes: In RX, a NOTONE program enables RX Audio Output and forces the RX Tone Decode Output to a logic "0". In TX, a NOTONE program generates a constant VBIAS-0.7V condition at the TX Tone Output pin. Each input has a 1 M pullup resistor. The gated output of the decode comparator. In RX, a logic "0" indicates a valid CTCSS tone decode condition, or the presence of NOTONE programming. A logic "0" enables the RX audio path. In TX, this output is held at logic "1". The voltage level at this pin is compared internally with a fixed reference level. A greater input level compared to the reference will result in a logic "0" at the RX Tone Decode output. This input should be externally connected to the RX Tone Detect output via external integration components C10, R2, R3, and D1 (see Figure 2). In RX, this pin outputs a logical "1" when a valid programmed CTCSS tone is received at the RX TONE INPUT. This input should be externally connected to the Decode Comparator input via external integration components C10, R2, R3, and D1 (see Figure 2). This pin outputs a logic "0" when a Notone CTCSS code has been programmed in RX. It is typically used to enable carrier squelch circuits under Notone RX conditions. The negative supply pin (ground). The buffered CTCSS sinewave tone output appears on this pin. In TX mode, the tone frequency is selected by program code (see Table 4); if NOTONE is programmed, the output is at Vbias-0.7V. In RX mode, the output goes open circuit. This is an emitter follower output with an internal 10 k load. Name Type Description
8
10
RX TONE DECODE
DECODE COMPARATOR
output
9
11
input
10
12
RX TONE DETECT
output
N/A
13
NOTONE
output
11 12
14 15
VSS TX TONE OUTPUT
power output
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
5
MX375
Pin No. LH 13 14 15 J,P,LH8 16 17 18
Name VBIAS FILTER OUTPUT BALANCED MODULATOR INPUT RX AUDIO OUTPUT TX AUDIO OUTPUT RX AUDIO INPUT TX AUDIO INPUT PTL
Type
Description This pin is set internally to VDD/2. It must be externally decoupled using a capacitor (C7) to VSS. See Figure 2.
output input
This is the output of the Input Audio Bandpass Filter. It must be A.C. coupled to the Balanced Modulator Input via capacitor C4. See Figure 2. This is the input to the balanced modulator. Must be A.C. coupled to the Filter Output via capacitor C4. See Figure 2. Outputs the received audio from a buffered output stage and is held at VBIAS when in TX. Outputs the transmitted audio in TX. In RX, this pin is held at VBIAS. The audio input for the RX mode. Input signals should be AC coupled via external capacitor C6. See Figure 2 This is the TX Audio voice input. Signals should be AC coupled via external capacitor C11. See Figure 2 The "press to listen" function input. In RX mode, a logic "0" enables the RX Audio Output directly, overriding tone squelch but not intercepting a private conversation; in TX mode, a logic "0" reverses the phase of the TX Tone Output for "squelch tail" reduction (see Table 5). This input, together with Load/ Latch , selects the operational mode of the RX/ TX and PrivateEnable functions. See Table 5
16 17 18 19 20
19 20 21 22 23
output output input input input
21 22 23
24 25 26
CONTROL input
RX/ TX PRIVATE ENABLE RX TONE INPUT
This input selects the RX or TX mode (RX = 1, TX = 0). This can be loaded in Serial or Parallel modes as described in Table 5 This input selects either Private or Clear mode (Clear = 1, Private = 0), and can be loaded by Serial or Parallel modes as described in Table 5. This input has an internal 1 M pullup resistor.
24
27
input
This is the received audio input to the on-chip CTCSS tone decoder. It should be A.C. coupled via capacitor C5.
Note: The MX375LH package is available in serial mode only. Table 1: Signal List
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
3. External Components
+5V
C1 +
D5 D4 D3 D2 D1 D0
VSS
1 R1 2 X1 C3 3 LOAD/LATCH 4 5 6 7 8 9 10 CTCSS TONE DECODE OUTPUT 11 C10 D1 R3 12 R2 13 NOTONE 14
C2
MX375J/P/LH8
XTAL XTAL LOAD/LATCH D5 D4 D3 D2 D1 D0 RX DECODE COMP IN DETECT NOTONE VSS V DD RXTONE PRIVEN RX/TX CONTROL PTL TXIN RXIN TXOUT RXOUT BALMOD FILTER BIAS TXTONE 28 27 26 25 24 23 22 21 20 19 18 17 16 15
C5 VDD CTCSS TONE IN (RX) PRIVACY ENABLE PUSH TO TALK MODE SELECTION PUSH TO LISTEN C11 C6 C12 C8 TX AUDIO IN RX AUDIO IN TX AUDIO OUT RX AUDIO OUT C4 BIAS C9 CTCSS TONE OUTPUT (TX) C7 + C13
Figure 2: Recommended External Components
R1 R2 R3 X1 C1 C2 C3 C4 C5 Note 1, 2
1M 560k 820k 4MHz 1.0F 33pF 33pF 0.1F 0.1F
10% 10% 10% 20% 20% 20% 20% 20%
C6 C7 C8 C9 C10 C11 C12 C13 D1
0.1F 1.0F 0.1F 0.1F 0.1F 0.1F 0.1F 0.001F small signal
20% 20% 20% 20% 20% 20% 20% 20%
Table 2: Recommended External Components Recommended External Components Note: 1. 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. 2. XTAL - At cut, fundamental, parallel resonant 20pF load capacitance, 0.05% tolerance
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
All trademarks and service marks are held by their respective companies.
Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
7
MX375
4. General Description
4.1.1 Pre- and De-emphasis Pre- and De-emphasis (6dB/octave) filters are included on-chip in the transmit path, so that the use of this device will produce natural sounding audio (clear or private modes) when installed in modern radio communication transceivers, with or without existing audio processing circuitry. The recommended layout is shown in block form below.
Clear To Transmitter Stages Amplifier Pre-emphasis Band Pass Filter Band Pass Filter De-emphasis Pre-emphasis Modulator
Clear From Receiver Stages Demodulator Band Pass Filter Band Pass Filter De-emphasis Amplifier
Figure 3: Transmit and Receive Paths 4.1.2 Functions and Outputs
D0-D5 Tone Tone Notone Tone Tone Tone Notone Tone Tone Notone Tone Tone Tone Notone Notone 1 1 0 1 1 1 0 1 1 0 1 1 1 0 RX/TX 0 0 0 1 1 1 1 0 0 0 1 1 1 1 PRIVATE ENABLE 0 0 0 0 0 0 0 1 1 1 1 1 1 1 PTL 1 0 X 1 0 X X 1 0 X 1 0 X X RX TONE DETECT 0 0 0 0 0 1 X 0 0 0 0 0 1 X RX TONE DECODER 1 1 1 1 1 0 0 1 1 1 1 1 0 0 TONE OUTPUT YES YES BIAS BIAS BIAS BIAS BIAS YES YES BIAS BIAS BIAS BIAS BIAS TONE PHASE 0 180 X X X X X 0 180 X X X X X TX PATH OPEN OPEN OPEN BIAS BIAS BIAS BIAS OPEN OPEN OPEN BIAS BIAS BIAS BIAS RX PATH BIAS BIAS BIAS BIAS OPEN OPEN OPEN BIAS BIAS BIAS BIAS OPEN OPEN OPEN PATH STATE INV INV CLR X CLR INV CLR CLR CLR CLR X CLR CLR CLR TONE TX, TONE TX, TONE REV TX, NOTONE INCOMPATIBLE INCOMPATIBLE COMPATIBLE RX, NOTONE TX, TONE TX, TONE REV TX, NOTONE INCOMPATIBLE INCOMPATIBLE COMPATIBLE RX, NOTONE
Table 3: Functions and Outputs Note: 1. Algebraic functions: RX Path On = RX x (PTL + RX Tone Decoder) Clear Path = Notone + Private Enable + (PTL x RX x RX Tone Decoder) Notone (D0 - D5) = 000011 Carrier Frequency = 3333Hz During inverted Path (TX or RX) 2. The Pre- and De-emphasis circuits remain in the transmit path in both the Clear and Invert Modes. 3. Power remains applied to the CTCSS tone decoder at all times. 4. During clear operation the carrier frequency is turned off to reduce spurious emissions.
(c) 1997 MX*COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054 Doc. # 20480026.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
PvtSQUELCHTM CTCSS Encoder/Decoder
8
MX375
5. Application
5.1.1 CTCSS Programming Nominal Frequency(Hz)
67.0 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 162.2 167.9 173.8 179.9 186.2 192.8 203.5 210.7 218.1 225.7 233.6 241.8 250.3 Notone 67.05 71.9 74.35 76.96 79.77 82.59 85.38 88.61 91.58 94.76 97.29 99.96 103.43 107.15 110.77 114.64 118.8 122.8 127.08 131.67 136.61 141.32 146.37 151.09 156.88 162.31 168.14 173.48 180.15 186.29 192.86 203.65 210.17 218.58 226.12 234.19 241.08 250.28 +0.07 0 -0.07 -0.5 +0.09 +0.1 -0.2 +0.13 +0.09 -0.04 -0.11 -0.04 -0.07 -0.05 -0.12 -0.14 0 -0.17 -0.17 -0.10 +0.08 +0.02 +0.12 -0.2 +0.11 +0.07 +0.14 -0.19 +0.14 +0.05 +0.03 +0.07 -0.25 +0.22 +0.18 +0.25 -0.30 -0.01
Frequency(Hz)
F0 (%) D5
1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Program Inputs D4
1 1 1 0 1 1 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
D3
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D2
1 1 1 1 1 1 1 1 0 1 0 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
D1
1 1 1 1 0 1 0 1 1 0 1 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0
D0
1 1 0 1 1 0 0 0 1 1 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0
Table 4: CTCSS Programming
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
9
MX375
(A) Explanation of Load/Latch function in Serial and Parallel Modes Load Configuration
Parallel Parallel Parallel Serial (data loading) Serial (data loaded)
Load/ Latch
1 1-0 0 0 0-1-0 Latches present data in
Result
Transparent, the data acts directly No further changes except to allow serial mode selection No change while serial data train is loaded Loaded serial data is latched
(B) Explanation of Control Input Load Configuration
Parallel Parallel Parallel Serial Serial
Load/ Latch
0 1 X 0-1-0 X
Control
0 0 1 0 1
RX/ TX , Private Enable
Latched Transparent Transparent Serial Load Transparent
Table 5: Load/ Latch and Control Input Function Notes: 1. "0 - 1 - 0" is a strobe pulse as shown in Figure 4 and Figure 5. 2. "X" denotes any logical state.
6. Performance Specification
6.1 Electrical Performance
Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the device. General Supply Voltage Input Voltage at any pin Current VDD VSS Any other pin J / P / LH / LH8 Packages Total Device Dissipation at TAMB 25C Derating above 25C Operating Temperature Storage Temperature -40 -55 800 10 85 125 mW mW/C above 25C C C -30 -30 -20 30 30 20 mA mA mA Min. -0.3 -0.3 Typ. Max. 7.0 (VDD + 0.3) Units V V
Table 6: Absolute Maximum Ratings
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
Operating Limits Correct operation of the device outside these limits is not implied. Notes Supply (VDD-VSS) Operating Temperature Xtal/Clock Frequency Min. 4.5 -40 4.0 Table 7: Operating Limits Operating Characteristics For the following conditions unless otherwise specified: VDD = 5.0V, TAMB = 25C, XTAL = 4.0MHz, Audio level )dB ref. = 300mVRMS, Composite input signal = 0dB, 1 kHz tone in, -12dB (6kHz band limited) Gaussian white noise with a -20dB CTCSS tone. Notes Static Values Supply Voltage Supply Current TX (Private) TX (Operating) RX (Operating) Analog Input Impedance Analog Output Impedance Tone Input Impedance Input Logic "1" Input Logic "0" Output Logic "1" (I=-0.1mA) Output Logic "0" (I=-0.1mA) Dynamic Values Decoder Input Signal Level Response Time Deresponse Time Selectivity Encoder Tone Output Level (775mVRMS ref.) Tone Frequency Accuracy Tone Harmonic Distortion Tone Output Load Current Output Level Variation between Tones Risetime (to 90% nominal level) (f0>100 Hz) (f0<100 Hz) 5 5 15 45 ms ms 2 9 -1.0 -3.0 -0.3 2.0 0 3.0 0.3 5.0 5.0 1.0 dB %f0 % mA dB 1,4 1,4,6 1,4,6 4 0.5 -20 250 250 3.0 dB ms ms %f0 4.0 1.0 3.5 1.5 0.5 0.5 0.5 15.0 12.0 7.0 mA mA mA M k M V V V V 4.5 5.0 5.5 V Min. Typ. Max Units Typ. 5.0 Max. 5.5 85 Units V C MHz
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
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PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
Notes RX Clear Total Harmonic Distortion Output Noise Level Passband Gain (300-3033Hz) Passband Ripple (300-3033Hz) Audio Stopband Attenuation (fIN>3333Hz) (fIN>3633Hz) (fIN<250Hz) RX Invert Total Harmonic Distortion Baseband Breakthrough Carrier Breakthrough Output Noise Level Passband Ripple (300-3000Hz) Audio Stopband Attenuation (fIN>3333Hz) (fIN>3633Hz) (fIN<250Hz) TX Clear Total Harmonic Distortion Output Noise Level Passband Gain (300-3033Hz) Passband Ripple (300-3033Hz) Audio Stopband Attenuation (fIN>3333Hz) (fIN>3633Hz) (fIN<250Hz) TX Invert Total Harmonic Distortion Baseband Breakthrough Carrier Breakthrough Output Noise Level Passband Ripple (300-3033Hz) Audio Stopband Attenuation (fIN>3333Hz) (fIN>3633Hz) (fIN<250Hz) 8 8 8 7,8 3,8 3,8 8 8 3 7 3 3 8 8 7,8 3 3,8 3 8 8 3 7 3 3
Min.
Typ. 2 -43
Max 5 1 3
Units % dB dB dB dB dB dB
-1
0
-20 -45 -42 4 -40 -40 -37 -50 -60 -60 3 -43 0 3 -20 -45 -42 4 -40 -40 -37 4 -50 -60 -60 10 5 4 10
% dB dB dB dB dB dB dB % dB dB dB dB dB dB % dB dB dB dB dB dB dB
Table 8: Operating Characteristics
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
Operating Characteristics Notes: 1. These values are obtained using the external integrating components given in Figure 2. 2. An emitter follower output 3. With an input signal of 1 kHz @ 0dB. 4. Under Composite Signal test conditions. 5. Any programmed tone with RL=600 , CL=15pF, including any response to a phase reversal instruction. 6. f0 > 100 Hz, (for 100Hz > f0 > 67Hz: t = [100/f0(Hz)] x 250ms). 7. Input ac short-circuit, audio path enabled. 8. Due to frequency inversion, these figures reflect the difference from the ideal response. 9. Reference 156.7 Hz (MX175 and MX275).
6.2 Timing Information
6.2.1 Serial Loading Min. Serial Mode Enable Set Up Time (tSMS) Clock "High" Pulse Width (tPWH) Clock "Low" Pulse Width (tPWL) Data Set Up Time (tDS) Data Hold Time (tDH) Load/Latch Set Up Time (tLL) Load/Latch Pulse Width (tLLW) 250 250 250 150 50 250 150 Typ. Max. Unit ns ns ns ns ns ns ns
Table 9: Serial Loading Timing Information
D4 SERIAL MODE ENABLE D5 SERIAL CLOCK
t SMS
t PWH
t PWL
t DH t DS SERIAL DATA INPUT t LL LOAD/LATCH t LLW
Figure 4: Serial Loading Timing
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
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PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
6.2.2 Parallel Loading Min. Data Valid Time (tVP) Load Time (tL) Fall Time (tF) Data Hold Time (tH) 50 200 150 50 Typ. Max. Unit ns ns ns ns
Table 10: Parallel Loading Timing Information
DATA INPUTS D0 - D5 RX/TX PRIVATE ENABLE
tVP
tL LOAD/LATCH
tF tH
LOAD DATA
DATA LATCHED
Figure 5: Parallel Load Timing
6.3 Packaging
E B Y DA
W
C K J W T H
Package Tolerances
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
PIN 1 P
G F
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 6: 24-pin PLCC Mechanical Outline: Order as part no. MX375LH
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
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Fax: 910 744-5054
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PvtSQUELCHTM CTCSS Encoder/Decoder
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MX375
D
Package Tolerances
DIM. MIN.
.450 (11.43) .485 (12.32) .045x45 .165 (4.20) .026 (0.66) .017 (0.43) .410 (10.41) .050 (1.27) .070 (1.78)
MAX.
.453 (11.51) .495 (12.57) typical .180 (4.57) .030 (0.76) .021 (0.53) .430 (10.92) typical .085 (2.16)
pin 1
A
B E F
G
C
H
A B C D E F G H J
J
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 7: 28-pin PLCC Mechanical Outline: Order as part no. MX375LH8
A
Package Tolerances
B E1
Y
E
PIN1 K H L J J1 P
T
C
DIM. A B C E E1 H J J1 K L P T Y
MIN.
TYP.
MAX.
1.440 (36.44) 1.47 (37.20) 0.530 (13.41) 0.555 (14.04) 0.160 (4.05) 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) 0.013 (0.33) 0.021 (0.53) 0.060 (1.52) 0.066 (1.67) 0.074 (1.88) 0.125 (3.16) 0.160 (4.05) 0.100 (2.54) 0.010 (0.25) 7 NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 8: 28-pin PDIP Mechanical Outline: Order as part no. MX375P
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
All trademarks and service marks are held by their respective companies.
Fax: 910 744-5054
Doc. # 20480026.007
PvtSQUELCHTM CTCSS Encoder/Decoder
15
MX375
A
Package Tolerances
DIM. MIN. TYP. MAX.
B
E1
E
PIN1 K H L J J1 F P K1 C
T
A B C E E1 F H J J1 K K1 L P T
1.440 (36.58) 1.460 (37.08) 0.510 (12.94) 0.530 (13.45) 0.165 (4.19) 0.230 (5.84) 0.640 (16.26) 0.715 (18.14) 0.608 (15.43) 0.618 (15.70) 1.300 (33.02) 0.050 (1.27) 0.015 (0.38) 0.018 (0.46) 0.055 (1.39) 0.050 (1.27) 0.080 (2.03) 0.075 (1.91) 0.080 (2.03) 0.115 (2.92) 0.171 (4.34) 0.100 (2.54) 0.0090 (0.228) 0.0102 (0.259)
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 9: 28-pin CDIP Mechanical Outline: Order as part no. MX375J
(c) 1997 MX*COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050
All trademarks and service marks are held by their respective companies.
Fax: 910 744-5054
Doc. # 20480026.007
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
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (USA) Inc.
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (Singapore)PteLtd
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

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