MC145745-ARCHIVED

Dual Mode 300- and 1200-Baud V.21 and V.23 Single-Chip Modem; \n\t•Conforms to ITU V.21 and V.23 Recommendations\n\t•DTMF Generator and Receiver for all 16 Standard Digits\n\t•Capable of Driving 0 dBm into a 600 ohm Load (VCC = 5 V)\n\t•Automatic Gain Control (AGC) Amplifier for the DTMF Receiver\n\t•Call-Progress Tone Detector\n\t•Four-Wire Serial Data Interface (SCP)\n\t•Programmable Transmission and Carrier Detection Levels\n\t•FSK/DTMF Analog Loopback Self-Test Function\n\t•Crystal Oscillator (3.579545 MHz) and Half Divider Circuit (7.159090 MHz)\n\t\tfor External Inputs\n\t•Operates in the Voltage Range of 3.3 - 5.5 V\n\t•Power Down Mode (ICC;

Overview MC145745 removed from active portfolio. Possible replacement part: none.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 built-in differential line driver has the capability of driving 0 dBm into a 600 ohm load with a 5 V single power supply. This device also includes a DTMF generator, DTMF receiver, call-progress tone detector, answer tone generator, and a receive timing control circuit. Besides having a clock generator with a crystal oscillator connected to it, the device 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 built-in 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.  

恩XP

MC145745

V.21/V.23TELEMETERMODEM

V.21/V.23TelemeterModem TheMC145745isaselectablemodemchipcompatiblewithITUV.21(300baudfullduplexasynchronous)andV.23mode2(1200baudhalfduplexasynchronous).Thebuilt–indifferentiallinedriverhasthecapabilityofdriving0dBmintoa600Ωloadwitha5Vsinglepower

MC145745FW

V.21/V.23TELEMETERMODEM

V.21/V.23TelemeterModem TheMC145745isaselectablemodemchipcompatiblewithITUV.21(300baudfullduplexasynchronous)andV.23mode2(1200baudhalfduplexasynchronous).Thebuilt–indifferentiallinedriverhasthecapabilityofdriving0dBmintoa600Ωloadwitha5Vsinglepower