DATA BULLETIN Pvt SQUELCHTM CTCSS Encoder/Decoder MX375 Features Applications • PRIVATE/CLEAR CAPABILITY • ON-CHIP TX AUDIO PRE/DEEMPHASIS • ALTERNATIVE TO STANDARD CTCSS “PARTY LINE” • POWERSAVE OPTION • MOBILE RADIOS • COMMUNITY REPEATERS • TELEPHONE/RADIO INTERCONNECT SYSTEMS TX Filter Output TX Balanced Modulator CLR Input TX Audio Output 6dB/Octave TX Audio Input -6dB/Octave RX BIAS RX fEMPH fCLK1 fCARRIER fCLK2 fEMPH PVT BIAS TX RX Audio Input RX Audio Output 3333Hz XTAL Clocks XTAL RX Tone Input Reference Hysteresis RX Tone Decoder Output Decode Comparator Input Filters RX Tone Detect Output CTCSS Tone Detect 3333 Hz Load/Latch D5 or Serial Enable 1 TX Tone Output D4 or Serial Enable 2 D3 or Serial Data Input D2 or Serial Clock Input D1 Input D0 Input 8-Bit Shift Register and Latches LD5-LD0 fCARRIER NoTone Output fCLK1 VDD fCLK2 fEMPH RX Path VBIAS TX Path Private V Logic Control RX/TX Control Private Enable Push-To-Listen SS PTL 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. PvtSQUELCH 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). © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 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. © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 3 MX375 1. Block Diagram TX Filter Output TX Balanced Modulator CLR Input TX Audio Output 6dB/Octave TX Audio Input -6dB/Octave RX BIAS RX fEMPH fCLK1 fCARRIER fCLK2 fEMPH PVT BIAS TX RX Audio Input RX Audio Output 3333Hz XTAL Clocks XTAL RX Tone Input Reference Hysteresis RX Tone Decoder Output Decode Comparator Input Filters RX Tone Detect Output CTCSS Tone Detect 3333 Hz Load/Latch D5 or Serial Enable 1 TX Tone Output D4 or Serial Enable 2 D3 or Serial Data Input D2 or Serial Clock Input D1 Input D0 Input 8-Bit Shift Register and Latches LD5-LD0 Logic Control RX/TX Control Private Enable fCARRIER NoTone Output fCLK1 VDD fCLK2 fEMPH RX Path VBIAS TX Path Private V SS Push-To-Listen PTL Figure 1: Device Block Diagram © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 4 MX375 2. Signal List Pin No. Name Type Description LH J,P,LH8 1 28 VDD power 5V supply pin. 2 1 XTAL/CLOCK input This is the input to the clock oscillator inverter. An external 4 MHz Xtal or clock input should be applied to this pin. 3 2 XTAL output 4 3 LOAD/ LATCH input 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 MΩ 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 MΩ pullup resistor. 8 10 RX TONE DECODE output 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”. 9 11 DECODE COMPARATOR input 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). 10 12 RX TONE DETECT output 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). N/A 13 NOTONE output 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. 11 14 VSS power The negative supply pin (ground). 12 15 TX TONE OUTPUT output 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 kΩ load. © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder Pin No. Name 5 MX375 Type Description LH J,P,LH8 13 16 VBIAS 14 17 FILTER OUTPUT output 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. 15 18 BALANCED MODULATOR INPUT input This is the input to the balanced modulator. Must be A.C. coupled to the Filter Output via capacitor C4. See Figure 2. 16 19 RX AUDIO OUTPUT output Outputs the received audio from a buffered output stage and is held at VBIAS when in TX. 17 20 TX AUDIO OUTPUT output Outputs the transmitted audio in TX. In RX, this pin is held at VBIAS. 18 21 RX AUDIO INPUT input The audio input for the RX mode. Input signals should be AC coupled via external capacitor C6. See Figure 2 19 22 TX AUDIO INPUT input This is the TX Audio voice input. Signals should be AC coupled via external capacitor C11. See Figure 2 20 23 PTL input 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). 21 24 CONTROL This pin is set internally to VDD/2. It must be externally decoupled using a capacitor (C7) to VSS. See Figure 2. This input, together with Load/ Latch , selects the operational mode of the RX/ TX and PrivateEnable functions. See Table 5 22 25 RX/ TX 23 26 PRIVATE ENABLE 24 27 RX TONE INPUT 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 MΩ pullup resistor. 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 © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 6 MX375 3. External Components +5V C1 + MX375J/P/LH8 C2 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 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 VDD C5 CTCSS TONE IN (RX) PRIVACY ENABLE PUSH TO TALK MODE SELECTION PUSH TO LISTEN C11 TX AUDIO IN C6 RX AUDIO IN C12 TX AUDIO OUT C8 RX AUDIO OUT C4 BIAS C9 CTCSS TONE OUTPUT (TX) C13 C7 + Figure 2: Recommended External Components R1 1MΩ ±10% C6 0.1µF ±20% R2 560kΩ ±10% C7 1.0µF ±20% R3 820kΩ ±10% C8 0.1µF ±20% C9 0.1µF ±20% X1 Note 1, 2 4MHz C1 1.0µF ±20% C10 0.1µF ±20% C2 33pF ±20% C11 0.1µF ±20% C3 33pF ±20% C12 0.1µF ±20% C4 0.1µF ±20% C13 0.001µF ±20% C5 0.1µF ±20% D1 small signal 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 © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. 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 Band Pass Filter Pre-emphasis Amplifier Band Pass Filter De-emphasis Pre-emphasis Modulator Clear From Receiver Stages Band Pass Filter Demodulator Band Pass Filter De-emphasis Amplifier Figure 3: Transmit and Receive Paths 4.1.2 Functions and Outputs D0-D5 Notone RX/TX PRIVATE ENABLE PTL RX TONE DETECT RX TONE DECODER TONE OUTPUT TONE PHASE TX PATH RX PATH PATH STATE Tone 1 0 0 1 0 1 Tone 1 0 0 0 0 1 Notone 0 0 0 X 0 Tone 1 1 0 1 Tone 1 1 0 0 TONE YES 0° OPEN BIAS INV TX, TONE YES 180° OPEN BIAS INV TX, TONE REV 1 BIAS X OPEN BIAS CLR TX, NOTONE 0 1 BIAS X BIAS BIAS X INCOMPATIBLE 0 1 BIAS X BIAS OPEN CLR INCOMPATIBLE Tone 1 1 0 X 1 0 BIAS X BIAS OPEN INV COMPATIBLE Notone 0 1 0 X X 0 BIAS X BIAS OPEN CLR RX, NOTONE Tone 1 0 1 1 0 1 YES 0° OPEN BIAS CLR TX, TONE Tone 1 0 1 0 0 1 YES 180° OPEN BIAS CLR TX, TONE REV Notone 0 0 1 X 0 1 BIAS X OPEN BIAS CLR TX, NOTONE Tone 1 1 1 1 0 1 BIAS X BIAS BIAS X INCOMPATIBLE Tone 1 1 1 0 0 1 BIAS X BIAS OPEN CLR INCOMPATIBLE Tone 1 1 1 X 1 0 BIAS X BIAS OPEN CLR COMPATIBLE Notone 0 1 1 X X 0 BIAS X BIAS OPEN CLR RX, NOTONE Table 3: Functions and Outputs Note: 1. Algebraic functions: RX Path On = RX × (PTL + RX Tone Decoder) Clear Path = Notone + Private Enable + (PTL × RX × 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. © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 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) ∆ F0 (%) D5 D4 D3 D2 D1 D0 67.05 +0.07 1 1 1 1 1 1 Frequency(Hz) 67.0 Program Inputs 71.9 71.9 0 0 1 1 1 1 1 74.4 74.35 -0.07 1 1 1 1 1 0 77.0 76.96 -0.5 0 0 1 1 1 1 79.7 79.77 +0.09 1 1 1 1 0 1 82.5 82.59 +0.1 0 1 1 1 1 0 85.4 85.38 -0.2 1 1 1 1 0 0 88.5 88.61 +0.13 0 0 1 1 1 0 91.5 91.58 +0.09 1 1 1 0 1 1 94.8 94.76 -0.04 0 1 1 1 0 1 97.4 97.29 -0.11 1 1 1 0 1 0 100.0 99.96 -0.04 0 0 1 1 0 1 103.5 103.43 -0.07 0 1 1 1 0 0 107.2 107.15 -0.05 0 0 1 1 0 0 110.9 110.77 -0.12 0 1 1 0 1 1 114.8 114.64 -0.14 0 0 1 0 1 1 118.8 118.8 0 0 1 1 0 1 0 123.0 122.8 -0.17 0 0 1 0 1 0 127.3 127.08 -0.17 0 1 1 0 0 1 131.8 131.67 -0.10 0 0 1 0 0 1 136.5 136.61 +0.08 0 1 1 0 0 0 141.3 141.32 +0.02 0 0 1 0 0 0 146.2 146.37 +0.12 0 1 0 1 1 1 151.4 151.09 -0.2 0 0 0 1 1 1 156.7 156.88 +0.11 0 1 0 1 1 0 162.2 162.31 +0.07 0 0 0 1 1 0 167.9 168.14 +0.14 0 1 0 1 0 1 173.8 173.48 -0.19 0 0 0 1 0 1 179.9 180.15 +0.14 0 1 0 1 0 0 186.2 186.29 +0.05 0 0 0 1 0 0 192.8 192.86 +0.03 0 1 0 0 1 1 203.5 203.65 +0.07 0 0 0 0 1 1 210.7 210.17 -0.25 0 1 0 0 1 0 218.1 218.58 +0.22 0 0 0 0 1 0 225.7 226.12 +0.18 0 1 0 0 0 1 233.6 234.19 +0.25 0 0 0 0 0 1 241.8 241.08 -0.30 0 1 0 0 0 0 250.3 250.28 -0.01 0 0 0 0 0 0 1 1 0 0 0 0 Notone Table 4: CTCSS Programming © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 9 MX375 (A) Explanation of Load/Latch function in Serial and Parallel Modes Load Configuration Result Load/ Latch Parallel 1 Parallel 1-0 Transparent, the data acts directly Latches present data in Parallel 0 No further changes except to allow serial mode selection Serial (data loading) 0 No change while serial data train is loaded Serial (data loaded) 0-1-0 Loaded serial data is latched (B) Explanation of Control Input Load Configuration Load/ Latch Control RX/ TX , Private Enable Parallel 0 0 Latched Parallel 1 0 Transparent Parallel X 1 Transparent Serial 0-1-0 0 Serial Load Serial X 1 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 Min. Supply Voltage Input Voltage at any pin Typ. Max. Units -0.3 7.0 V -0.3 (VDD + 0.3) V VDD -30 30 mA VSS -30 30 mA Any other pin -20 20 mA 800 mW 10 mW/°C above 25°C Current J / P / LH / LH8 Packages Total Device Dissipation at TAMB 25°C Derating above 25°C Operating Temperature -40° 85° C Storage Temperature -55° 125° C Table 6: Absolute Maximum Ratings © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 10 MX375 Operating Limits Correct operation of the device outside these limits is not implied. Notes Min. Typ. Max. Units Supply (VDD-VSS) 4.5 5.0 5.5 V Operating Temperature -40 85 °C Xtal/Clock Frequency 4.0 MHz Table 7: Operating Limits Operating Characteristics For the following conditions unless otherwise specified: VDD = 5.0V, TAMB = 25°C, 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 Min. Typ. Max Units 4.5 5.0 5.5 V TX (Private) 15.0 mA TX (Operating) 12.0 mA RX (Operating) 7.0 mA Static Values Supply Voltage Supply Current Analog Input Impedance 0.5 MΩ Analog Output Impedance 0.5 kΩ Tone Input Impedance 0.5 MΩ Input Logic “1” 3.5 V Input Logic “0” 1.5 Output Logic “1” (I=-0.1mA) 4.0 V V Output Logic “0” (I=-0.1mA) 1.0 V Dynamic Values Decoder Input Signal Level 1,4 -20 dB Response Time 1,4,6 250 ms Deresponse Time 1,4,6 250 ms ±3.0 %f0 3.0 dB 0.3 %f0 5.0 % 5.0 mA 1.0 dB Selectivity 4 ±0.5 Encoder Tone Output Level (775mVRMS ref.) -3.0 Tone Frequency Accuracy -0.3 Tone Harmonic Distortion 0 2.0 Tone Output Load Current 2 Output Level Variation between Tones 9 -1.0 Risetime (to 90% nominal level) (f0>100 Hz) 5 15 ms (f0<100 Hz) 5 45 ms © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 11 MX375 Notes Min. Typ. Max Units 5 % RX Clear Total Harmonic Distortion 3 2 Output Noise Level 7 -43 Passband Gain (300-3033Hz) 3 Passband Ripple (300-3033Hz) 3 -1 0 dB 1 dB 3 dB Audio Stopband Attenuation (fIN>3333Hz) 8 -20 dB (fIN>3633Hz) 8 -45 dB -42 dB (fIN<250Hz) RX Invert Total Harmonic Distortion 3,8 4 Baseband Breakthrough 3 -40 dB Carrier Breakthrough 10 % -40 dB 7,8 -37 dB 3 - (fIN>3333Hz) 8 -50 dB (fIN>3633Hz) 8 -60 dB -60 dB Output Noise Level Passband Ripple (300-3000Hz) 4 dB Audio Stopband Attenuation (fIN<250Hz) TX Clear Total Harmonic Distortion 3 3 5 % Output Noise Level 7 -43 dB Passband Gain (300-3033Hz) 3 0 dB Passband Ripple (300-3033Hz) 3 3 dB Audio Stopband Attenuation (fIN>3333Hz) 8 -20 dB (fIN>3633Hz) 8 -45 dB -42 dB (fIN<250Hz) TX Invert Total Harmonic Distortion 3,8 4 Baseband Breakthrough Carrier Breakthrough Output Noise Level 7,8 Passband Ripple (300-3033Hz) 3,8 10 % -40 dB -40 dB -37 dB 4 dB Audio Stopband Attenuation (fIN>3333Hz) 8 -50 dB (fIN>3633Hz) 8 -60 dB (fIN<250Hz) 8 -60 dB Table 8: Operating Characteristics © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 12 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 Ω, 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. Typ. Max. Unit Serial Mode Enable Set Up Time (tSMS) 250 - - ns Clock “High” Pulse Width (tPWH) 250 - - ns Clock “Low” Pulse Width (tPWL) 250 - - ns Data Set Up Time (tDS) 150 - - ns Data Hold Time (tDH) 50 - - ns Load/Latch Set Up Time (tLL) 250 - - ns Load/Latch Pulse Width (tLLW) 150 - - ns Table 9: Serial Loading Timing Information D4 SERIAL MODE ENABLE D5 t SMS t PWH t PWL SERIAL CLOCK t DH t DS SERIAL DATA INPUT t LL t LLW LOAD/LATCH Figure 4: Serial Loading Timing © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 13 MX375 6.2.2 Parallel Loading Min. Typ. Max. Unit Data Valid Time (tVP) 200 ns Load Time (tL) 150 ns Fall Time (tF) 50 Data Hold Time (tH) 50 ns ns Table 10: Parallel Loading Timing Information tVP DATA INPUTS D0 - D5 RX/TX PRIVATE ENABLE tL tF LOAD/LATCH tH LOAD DATA DATA LATCHED Figure 5: Parallel Load Timing 6.3 Packaging E B C Package Tolerances K DIM. A B C D E F G H J K P T W Y Y DA W J W T PIN 1 H P G 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 F Figure 6: 24-pin PLCC Mechanical Outline: Order as part no. MX375LH © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 14 MX375 D B A pin 1 Package Tolerances G F E C H DIM. MIN. MAX. A B C D E F G H J .450 (11.43) .485 (12.32) .453 (11.51) .495 (12.57) .045x45 .165 (4.20) .026 (0.66) .017 (0.43) .410 (10.41) .050 (1.27) .070 (1.78) typical .180 (4.57) .030 (0.76) .021 (0.53) .430 (10.92) typical .085 (2.16) NOTE : All dimensions in inches (mm.) Angles are in degrees J Figure 7: 28-pin PLCC Mechanical Outline: Order as part no. MX375LH8 A Package Tolerances B E E1 Y T PIN1 K H L C J J1 P 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 © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their respective companies. PvtSQUELCHTM CTCSS Encoder/Decoder 15 MX375 Package Tolerances A DIM. B E E1 T PIN1 K K1 C H L J J1 P A B C E E1 F H J J1 K K1 L P T MIN. TYP. MAX. 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 F Figure 9: 28-pin CDIP Mechanical Outline: Order as part no. MX375J © 1997 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Fax: 910 744-5054 Doc. # 20480026.007 All trademarks and service marks are held by their 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 [email protected] 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 [email protected] www.cmlmicro.com No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 [email protected] www.cmlmicro.com D/CML (D)/2 May 2002