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MC145442 Dataheets PDF



Part Number MC145442
Manufacturers Motorola
Logo Motorola
Description Single-Chip 300-Baud Modem
Datasheet MC145442 DatasheetMC145442 Datasheet (PDF)

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145442/D Single-Chip 300-Baud Modem The MC145442 and MC145443 silicon–gate CMOS single–chip low–speed modems contain a complete frequency shift keying (FSK) modulator, demodulator, and filter. These devices are with CCITT V.21 (MC145442) and Bell 103 (MC145443) specifications. Both devices provide full–duplex or half–duplex 300–baud data communication over a pair of telephone lines. They also include a carrier detect circuit for t.

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145442/D Single-Chip 300-Baud Modem The MC145442 and MC145443 silicon–gate CMOS single–chip low–speed modems contain a complete frequency shift keying (FSK) modulator, demodulator, and filter. These devices are with CCITT V.21 (MC145442) and Bell 103 (MC145443) specifications. Both devices provide full–duplex or half–duplex 300–baud data communication over a pair of telephone lines. They also include a carrier detect circuit for the demodulator section and a duplexer circuit for direct operation on a telephone line through a simple transformer. • • • • • • • • • • • • • • • MC145442 Compatible with CCITT V.21 MC145443 Compatible with Bell 103 Low–Band and High–Band Band–Pass Filters On–Chip Simplex, Half–Duplex, and Full–Duplex Operation Originate and Answer Mode Analog Loopback Configuration for Self Test Hybrid Network Function On–Chip Carrier Detect Circuit On–Chip Adjustable Transmit Level and CD Delay Timing On–Chip Crystal Oscillator (3.579 MHz) Single + 5 V Power Supply Operation Internal Mid–Supply Generator Power–Down Mode Pin Compatible with MM74HC943 Capable of Driving – 9 dBm into a 600 Ω Load MC145442 MC145443 20 1 P SUFFIX PLASTIC DIP CASE 738 20 1 DW SUFFIX SOG PACKAGE CASE 751D ORDERING INFORMATION MC145442P MC145443P Plastic DIP Plastic DIP MC145442DW SOG Package MC145443DW SOG Package PIN ASSIGNMENT DSI LB CD CDT RxD VDD CDA Xout Xin FB 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 TLA VAG Exl TxA RxA1 RxA2 SQT MODE VSS TxD REV 1 8/95 © Motorola, Inc. 1995 MOTOROLA MC145442•MC145443 1 BLOCK DIAGRAM 4 7 CARRIER 3 DETECT AC AMP HIGH–BAND BPF DEMOD 5 10 1 SMOOTHING FILTER – + 17 18 CDT CDA CD RxA2 15 – + LOW–BAND BPF AAF S/H RxA1 16 * RxD FB DSI TxA ExI LB MODE SQT TxD TLA Xout Xin 2 13 14 11 20 8 9 MODULATOR CLOCK DIVIDER SAMPLING CLOCK: 77.82 kHz SAMPLING CLOCK: 19.46 kHz MODE CONTROL INTERNAL VAG ANALOG GROUND GENERATOR 19 6 12 VAG VDD VSS OSCILLATOR * Refer to the FB pin description. ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to VSS) Rating Supply Voltage DC Input Voltage DC Output Voltage Clamp Diode Current, per Pin DC Output Current, per Pin Power Dissipation Operating Temperature Range Storage Temperature Range Symbol VDD Vin Vout IIK, IOK Iout PD TA Tstg Value – 0.5 to + 7.0 – 0.5 to VDD + 0.5 – 0.5 to VDD + 0.5 ± 20 ± 28 500 – 40 to + 85 – 65 to + 150 Unit V V V mA mA mW °C °C This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation it is recommended that Vin and Vout be constrained to the range VSS ≤ (Vin or Vout) ≤ VDD). Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). RECOMMENDED OPERATING CONDITIONS Parameter Supply Voltage DC Input or Output Voltage Input Rise or Fall Time Crystal Frequency* Symbol VDD Vin, Vout tr, tf fcrystal Min 4.5 0 — 3.2 Max 5.5 VDD 500 5.0 Unit V V ns MHz * Changing the crystal frequency from 3.579 MHz will change the output frequencies. The change in output frequency will be proportional to the change in crystal frequency. MC145442•MC145443 2 MOTOROLA DC ELECTRICAL CHARACTERISTICS (VDD = 5.0 V ± 10%, TA = – 40 to + 85°C) Characteristic High–Level Input Voltage Low–Level Input Voltage High–Level Output Voltage IOH = 20 µA IOH = 2 mA IOH = 20 µA Low–Level Output Voltage IOL = 20 µA IOL = 2 mA IOL = 20 µA Input Current LB Xin, TxD, Mode, SQT LB Xin, TxD, Mode, SQT CD, RxD CD, RxD Xout VOL CD, RxD CD, RxD Xout LB, TxD, Mode, SQT RxA1, RxA2 Xin Iin — — — — — — — — Xin All Other Inputs Cin VAG VCDA Rf — — 2.4 1.1 10 — — 0.05 — 10 — 7 200 10 — 2.5 1.2 20 0.1 0.4 — ± 1.0 ± 12 ± 10 10 300 — 10 2.6 1.3 30 µA Symbol VIH VIL VOH VDD – 0.1 3.7 — — — VDD – 0.05 — — — V Min VDD – 0.8 3.15 — — Typ — — — — Max — — 0.8 1.1 Unit V V V Quiesent Supply Current (Xin or fcrystal = 3.579 MHz) Power–Down Supply Current Input Capacitance VAG Output Voltage (IO = ± 10 µA) CDA Output Voltage (IO = ± 10 µA) Line Driver Feedback Resistor IDD mA µA pF V V kΩ AC ELECTRICAL CHARACTERISTICS (VDD = 5.0 V ± 10%, TA = – 40 to + 85°C, Crystal Frequency = 3.579 MHz ± 0.1%; See Figure 1) Characteristic TRANSMITTER Power Output on TxA RL = 1.2 kΩ, RTLA = ∞ RL = 1.2 kΩ, RTLA = 5.5 kΩ Second Harmonic Power RL = 1.2 kΩ RECEIVE FILTER AND HYBRID Hybrid Input Impedance RxA1, RxA2 FB Output Impedance Adjacent Channel Rejection DEMODULATOR Receive Carrier Amplitude Dynamic Range Bit Jitter (S/N = 30 dB, Input = – 38 dBm, Bit Rate = 300 baud) Bit Bias Carrier Detect Threshold (CDA = 1.2 V or CDA grounded through a 0.1 µF capacitor) On to Off Off to On – 48 — — — — — — 36 100 5 – 44 – 47 – 12 — — — — — dBm dB µs % dBm 40 — – 48 50 16 — — — — kΩ kΩ dBm dBm – 13 – 10 — – 12 –9 – 56 – 11 –8 — dBm Min Typ Max Unit.


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