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參數(shù)資料
| 型號(hào)： | MC145740F |
| 廠商： | MOTOROLA INC |
| 元件分類： | 信令電路 |
| 英文描述： | Dual Tone Multiple Frequency Line Interface |
| 中文描述： | TELECOM, DTMF SIGNALING CIRCUIT, PDSO20 |
| 封裝： | SOG-20 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 141K |
| 代理商： | MC145740F |
MC145740
MOTOROLA
1
Product Preview
The MC145740 is a silicon gate HCMOS LSI designed for general purpose
Dual Tone Multiple Frequency (DTMF) communications, and contains a DTMF
signal generator and a receiver for all 16 standard digits.
The generator block has a differential line driver which drives a 600
load
with 0 dBm level. The transmit signal level is adjusted in 1 dB steps by the
programmable attenuator.
The receiver block has an Auto Gain Control (AGC) amplifier to demodulate
50 dB (typ) dynamic range of DTMF signals to the hexadecimal codes.
The device also includes a serial control interface that permits a CPU to
exercise the following built–in features.
Single Power Supply: 3.6 to 5.5 V
DTMF Generator and Receiver for All 16 Standard Digits
0 dBm Line Driver Into 600
Load
AGC Amplifier
Programmable Transmit Attenuator
Serial Control Interface
Power Down Mode, Less Than 1
μ
A
BLOCK DIAGRAM
+
–
RxA
DSI
TxA2
TxA1
Rx GAIN
CONTROL
WITH AGC
AMP
ANTI–ALIAS
FILTER
SMOOTHING
FILTER AND
Tx GAIN
CONTROL
CLOCK
GENERATOR
DTMF
GENERATOR
CONTROL REGISTER
AND
SERIAL INTERFACE
HIGH–BAND
BPF
LOW–BAND
BPF
DTMF
DETECTER
TIMING
CIRCUIT
AGCout
FC1
FC2
X1
X2
VDD
VSS
Vref
DV
TD
EN
CLK
DATA
R/W
– 1
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 MC145740/D
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
F SUFFIX
SOG PACKAGE
CASE 751J
ORDERING INFORMATION
MC145740F
SOG Package
FC1
AGCout
RxA
TxA2
TxA1
VSS
X2
X1
FC2
Vref
5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
11
12
13
EN
CLK
VSS
VDD
DSI
VDD
DV
TD
R/W
DATA
20
1
REV 0
8/96
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