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MC145745 Scheda tecnica(PDF) 1 Page - Motorola, Inc

Il numero della parte MC145745
Spiegazioni elettronici  V.21/V.23 TELEMETER MODEM
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Produttore elettronici  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC145745 Scheda tecnica(HTML) 1 Page - Motorola, Inc

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MC145745
MOTOROLA
1
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)
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
Order this document
by MC145745/D
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
MC145745
FW SUFFIX
SOIC
CASE 751M
ORDERING INFORMATION
MC145745FW
SOIC
28
1
5
4
3
2
1
10
9
8
7
6
11
12
13
14
20
21
22
23
24
25
26
19
27
28
18
17
16
15
GND
Vref
CDA
TLA
TEST 1
RxD
TxD
CD
CLKO
X1
X2
ECLK
PB0
GND
VCC
RxA
TxA1
TxA2
TEST 2
SCPEN
SCPCLK
SCP Rx
SCP Tx
RESET
PB3
PB2
PB1
VCC
© Motorola, Inc. 1996
REV 0
7/96


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