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MC145745

Motorola
Part Number MC145745
Manufacturer Motorola
Description V.21/V.23 Telemeter Modem
Published Aug 1, 2005
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145745/D MC145745 Product Preview V.21/V.23 Telemeter...
Datasheet PDF File MC145745 PDF File

MC145745
MC145745


Overview
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145745/D MC145745 Product Preview V.
21/V.
23 Telemeter Modem 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 Ω 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.
• • • • • • • • • 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 Ω Load (VCC = 5 V) Automatic Gain Control (AGC) Amplifier for the DTMF Receiver Call–Progress Tone Detector Four–Wire Serial Data Interface (SCP) Programmable Transmission and Carrier Detection Levels FSK/DTMF Analog Loopback Self–Test 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 µA) 28 1 FW SUFFIX SOIC CASE 751M ORDERING INFORMATION MC145745FW SOIC PIN ASSIGNMENT GND Vref CDA TLA TEST 1 RxD TxD CD CLKO X1 X2 ECLK PB0 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC RxA TxA1 TxA2 TEST 2 SCPEN SCPCLK SCP Rx SCP Tx RESET PB3 PB2 PB1 VCC This document contains information on a product under development.
M...



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