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參數(shù)資料
| 型號： | MC145745FW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | V.21/V.23 Telemeter Modem |
| 中文描述： | 1.2 kbps DATA, MODEM, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 172K |
| 代理商： | MC145745FW |
MC145745
MOTOROLA
1
Product Preview
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
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
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
μ
A)
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
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
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
REV 0
7/96
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