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MC145745 Datasheet

  • MC145745

  • V.21/V.23 Telemeter Modem

  • 174.32KB

  • Motorola   Motorola

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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鈥搃n differential line driver has the capability of driving
0 dBm into a 600
鈩?/div>
load with a 5 V single power supply. This device also
includes a DTMF generator, DTMF receiver, call鈥損rogress 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鈥搃n 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.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
鈩?/div>
Load (VCC = 5 V)
Automatic Gain Control (AGC) Amplifier for the DTMF Receiver
Call鈥揚(yáng)rogress Tone Detector
Four鈥揥ire Serial Data Interface (SCP)
Programmable Transmission and Carrier Detection Levels
FSK/DTMF Analog Loopback Self鈥揟est Function
Crystal Oscillator (3.579545 MHz) and Half Divider Circuit (7.159090 MHz)
for External Inputs
鈥?/div>
Operates in the Voltage Range of 3.3 鈥?5.5 V
鈥?/div>
Power Down Mode (ICC < 1
碌A(chǔ))
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. Motorola reserves the right to change or discontinue this product without notice.
REV 0
7/96
漏
Motorola, Inc. 1996
MOTOROLA
MC145745
1

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