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MC145745

Features: • Conforms to ITU V.21 and V.23 Recommendations• DTMF Generator and Receiver for all 16 Standard Digits• Capable of Driving 0 dBm into a 600 W Load (VCC = 5 V)• Automatic Gain Control (AGC) Amplifier for the DTMF Receiver• CallProgress Tone Detector• F...

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MC145745: Features: • Conforms to ITU V.21 and V.23 Recommendations• DTMF Generator and Receiver for all 16 Standard Digits• Capable of Driving 0 dBm into a 600 W Load (VCC = 5 V)• Aut...

MC145745 Data Sheet

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Part Number:
MC145745
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

• Conforms to ITU V.21 and V.23 Recommendations
• DTMF Generator and Receiver for all 16 Standard Digits
• Capable of Driving 0 dBm into a 600 W Load (VCC = 5 V)
• Automatic Gain Control (AGC) Amplifier for the DTMF Receiver
• CallProgress Tone Detector
• FourWire Serial Data Interface (SCP)
• Programmable Transmission and Carrier Detection Levels
• FSK/DTMF Analog Loopback SelfTest Function
• Crystal Oscillator (3.579545 MHz) and Half Divider Circuit (7.159090 MHz) for External Inputs
• Operates in the Voltage Range of 3.3 5.5 V
• Power Down Mode (ICC < 1 mA)


Pinout

Connection Diagram


Specifications

Symbol Characteristics Value Unit
VCC DC Supply Voltage 0.5 to + 7.0 V
VIN DC Input Voltage 0.5 to VCC + 0.5 V
VOUT DC Output Voltage 0.5 to VCC + 0.5 V
IIN DC Input Current ±20 mA
IOUT DC Output Current ±50 mA
PD Power Dissipation 500 °C
Tstg Storage Temperature Range 65 to + 150 °C



Description

The MC145745 is a selectable modem chip compatible with ITU V.21 (300 baud full duplex asynchronous) and V.23 mode 2 (1200 baud half duplex asynchronous). The builtin differential line driver has the capability of driving 0 dBm into a 600 W load with a 5 V single power supply. MC145745 also includes a DTMF generator, DTMF receiver, callprogress tone detector, answer tone generator, and a receive timing control circuit.

Besides having a clock generator with a crystal oscillator connected to it, the MC145745 has a divider circuit to which input of a double frequency clock is possible from external sources, such as from a microcontroller unit (MCU). The serial control port (SCP) permits the MCU to access internal registers for exercising the builtin features.

A low consumption device, the MC145745 integrates various functions in a small package. This modem IC is best suited for telemeter and other applications of this type




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