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PDF MC145740 Data sheet ( Hoja de datos )
| Número de pieza | MC145740 | |
| Descripción | Dual Tone Multiple Frequency Line Interface | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC145740/D
Product Preview
Dual Tone Multiple Frequency
Line Interface
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 Ω 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 Ω Load
• AGC Amplifier
• Programmable Transmit Attenuator
• Serial Control Interface
• Power Down Mode, Less Than 1 µA
AGCout
BLOCK DIAGRAM
FC1 FC2
MC145740
20
F SUFFIX
1 SOG PACKAGE
CASE 751J
ORDERING INFORMATION
MC145740F SOG Package
PIN ASSIGNMENT
TxA1 1
TxA2 2
RxA
AGCout
Vref
FC1
3
4
5
6
FC2 7
X1 8
X2 9
VSS 10
20 DSI
19 VDD
18 VSS
17 CLK
16 EN
15 DATA
14 R/W
13 TD
12 DV
11 VDD
RxA
Rx GAIN
CONTROL
WITH AGC
ANTI–ALIAS
FILTER
HIGH–BAND
BPF
DTMF
DETECTER
TIMING
CIRCUIT
AMP LOW–BAND
BPF
DSI
TxA2
TxA1 – 1
SMOOTHING
– FILTER AND
+ Tx GAIN
CONTROL
CLOCK
GENERATOR
DTMF
GENERATOR
CONTROL REGISTER
AND
SERIAL INTERFACE
DV
TD
EN
CLK
DATA
R/W
X1 X2
VDD VSS Vref
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
REV 0
8/96
©MOMoTtoOroRla,OInLc.A1996
MC145740
1
1 page  
0
0
– 25
3.4 k 4 k
16 k
– 15 dB/OCT.
256 k
f (Hz)
– 55
Figure 1. Out–of–Band Energy
DTMF TONE CHANGED WITHOUT SILENT PERIOD
RxA “A”
TD
“B” “C”
(NOTE 1)
“D”
u uton 1 10 mS
ton toff
DV
(NOTE 2)
D0 – D3
“A”
(NOTE 3)
“B” “C”
“D”
NOTES:
1. The high–to–low and low–to–high transition on the TD pin will appear immediately after the valid DTMF
tones are detected. The TD will also output a short H pulse when the device detects the DTMF tones
being changed without a silent period.
2. The high–to–low and low–to–high transition on the DV pin will appear after the programmed guard time
determined by two bits of serial data (CD1, CD0).
3. The device recognizes the DTMF tones changed without a silent period, and the four bits of data can
be read from the status register.
Figure 2. DTMF Detect Timing
NO DETECT
DETECT MINIMUM
WIDTH
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎΖ3.5%ÎÎÎ –1.5%–2Hz
+ 1.5% + 2 Hz
LO
NO DETECT
ÎÎÎ+3.ÎÎÎ5% ÎÎÎÎÎÎÎÎÎ
Figure 3. DTMF Frequency Detect Band Width
MOTOROLA
MC145740
5
5 Page 
APPLICATION CIRCUIT
TIP
RING
10 Ω 600 : 600
*
600 Ω
100 µF 0.1 µF
0.1 µF
0.1 µF
3.579545 MHz
TxA1
1
TxA2
2
RxA
AGCout*
Vref
3
4
5
FC1 6
FC2 7
X1
8
X2
9
GND
10
DSI*
20
19 VCC
18 GND
CLK
17
EN
16
15 DATA
14 R/W
TD
13
12 DV
11 VCC
RDSI
100 µF
0.1 µF
+5V
MCU
* Protection Network
Reference Analog Ground
System Ground
* The external devices (i.e., modem) may be connected on these pins, using the built–in line interface circuit.
MOTOROLA
MC145740
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MC145740.PDF ] | |
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