Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

MC145442DW Scheda tecnica(PDF) 4 Page - Motorola, Inc

Il numero della parte MC145442DW
Spiegazioni elettronici  SINGLE-CHIP 300-BAUD MODEM
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC145442DW Scheda tecnica(HTML) 4 Page - Motorola, Inc

  MC145442DW Datasheet HTML 1Page - Motorola, Inc MC145442DW Datasheet HTML 2Page - Motorola, Inc MC145442DW Datasheet HTML 3Page - Motorola, Inc MC145442DW Datasheet HTML 4Page - Motorola, Inc MC145442DW Datasheet HTML 5Page - Motorola, Inc MC145442DW Datasheet HTML 6Page - Motorola, Inc MC145442DW Datasheet HTML 7Page - Motorola, Inc MC145442DW Datasheet HTML 8Page - Motorola, Inc MC145442DW Datasheet HTML 9Page - Motorola, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 12 page
background image
MC145442
•MC145443
MOTOROLA
4
TEST
INPUT
600
600
VDD
RTLA
20
17
15
16
TEST
OUTPUT
4
CDT
RxA1
CCDT
CFB
0.1
µF
10
FB
RxD
5
11
Dout
Din
TxD
Xin
9
8
Xout
TLA
TxA
RxA2
MC145442
MC145443
0.1
µF
3.579 MHz
± 0.1%
Figure 1. AC Characteristics Evaluation Circuit
PIN DESCRIPTIONS
VDD
Positive Power Supply (Pin 6)
This pin is normally tied to 5.0 V.
VSS
Negative Power Supply (Pin 12)
This pin is normally tied to 0 V.
VAG
Analog Ground (Pin 19)
Analog ground is internally biased to (VDD – VSS) / 2. This
pin must be decoupled by a capacitor from VAG to VSS and a
capacitor from VAG to VDD. Analog ground is the common
bias line used in the switched capacitor filters, limiter, and
slicer in the demodulation circuitry.
TLA
Transmit Level Adjust (Pin 20)
This pin is used to adjust the transmit level. Transmit level
adjustment range is typically from – 12 dBm to – 9 dBm. (See
Applications Information.)
TxD
Transmit Data (Pin 11)
Binary information is input to the transmit data pin. Data
entered for transmission is modulated using FSK techniques.
A logic high input level represents a mark and a logic low rep-
resents a space (see Table 1).
TxA
Transmit Carrier (Pin 17)
This is the output of the line driver amplifier. The transmit
carrier is the digitally synthesized sine wave output of the
modulator derived from a crystal oscillator reference. When a
3.579 MHz crystal is used the frequency outputs shown in
Table 1 apply. (See
Applications Information.)
Table 1. Bell 103 and CCITT V.21
Frequency Characteristics
Data
Originate Mode
Answer Mode
Data
Transmit
Receive
Transmit
Receive
Bell 103 (MC145443)
Space
1070 Hz
2025 Hz
2025 Hz
1070 Hz
Mark
1270 Hz
2225 Hz
2225 Hz
1270 Hz
CCITT V.21 (MC145442)
Space
1180 Hz
1850 Hz
1850 Hz
1180 Hz
Mark
980 Hz
1650 Hz
1850 Hz
980 Hz
NOTE: Actual frequencies may be
± 5 Hz assuming 3.579545 MHz
crystal is used.
15 dB/OCTAVE
256
64
16
3.4 4
2
0
0
– 20
– 25
– 55
– 60
MAXIMUM LEVEL OF OUT–OF–BAND ENERGY
RELATIVE TO THE TRANSMIT CARRIER LEVEL INTO 600
Ω (kHz)
Figure 2. Out–of–Band Energy
ExI
External Input (Pin 18)
The external input is the non–inverting input to the line
driver. It is provided to combine an auxiliary audio signal or
speech signal to the phone line using the line driver. This pin
should be connected to VAG if not used. The average level
must be the same as VAG to maintain proper operation. (See
Applications Information.)
DSI
Driver Summing Input (Pin 1)
The driver summing input may be used to connect an ex-
ternal signal, such as a DTMF dialer, to the phone line. A
series resistor, RDSI, is needed to define the voltage gain
AV (see Applications Information and Figure 6). When ap-
plying a signal to do DSI pin, the modulator should be
squelched by bringing SQT (Pin 14) to a logic high level. The
voltage gain, AV, is calculated by the formula AV = – Rf/RDSI
(where Rf ≈ 20 kΩ). For example, a 20 kΩ resistor for RDSI
will provide unity gain (AV = – 20 kΩ/20 kΩ = – 1). This pin
must be left open if not used.
RxD
Receive Data (Pin 6)
The receive data output pin presents the digital binary data
resulting from the demodulation of the receive carrier. If no
carrier is present, CD high, the receive data output (RxD) is
clamped high.


Codice articolo simile - MC145442DW

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Motorola, Inc
MC145442B MOTOROLA-MC145442B Datasheet
113Kb / 12P
   SINGLE-CHIP 300-BAUD MODEM
MC145442BDW MOTOROLA-MC145442BDW Datasheet
113Kb / 12P
   SINGLE-CHIP 300-BAUD MODEM
logo
LANSDALE Semiconductor ...
MC145442BDW LANSDALE-MC145442BDW Datasheet
800Kb / 11P
   Single-Chip 300-Baud Modem
MC145442BDW LANSDALE-MC145442BDW Datasheet
395Kb / 11P
   Single?밅hip 300?밄aud Modem
logo
Motorola, Inc
MC145442BP MOTOROLA-MC145442BP Datasheet
113Kb / 12P
   SINGLE-CHIP 300-BAUD MODEM
More results

Descrizione simile - MC145442DW

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Motorola, Inc
MC145444 MOTOROLA-MC145444 Datasheet
165Kb / 12P
   Single-Chip 300-Baud Modem
logo
LANSDALE Semiconductor ...
ML145442 LANSDALE-ML145442 Datasheet
800Kb / 11P
   Single-Chip 300-Baud Modem
logo
Motorola, Inc
MC145442B MOTOROLA-MC145442B Datasheet
113Kb / 12P
   SINGLE-CHIP 300-BAUD MODEM
logo
National Semiconductor ...
MM74HC943 NSC-MM74HC943 Datasheet
153Kb / 8P
   300 Baud Modem
logo
Motorola, Inc
MC145446A MOTOROLA-MC145446A Datasheet
267Kb / 14P
   SINGLE-CHIP 300-BAUD MODEM WITH DTMF TRANSCEIVER
logo
National Semiconductor ...
74VHC943 NSC-74VHC943 Datasheet
179Kb / 12P
   300 Baud Modem (5V Supply)
logo
CML Microcircuits
FX409 CMLMICRO-FX409 Datasheet
289Kb / 6P
   1200 BAUD FFSK MODEM
logo
OKI electronic componet...
MSM6926 OKI-MSM6926 Datasheet
183Kb / 25P
   300 bps Single Chip FSK MODEM
logo
TDK Electronics
TSC73M223 TDK-TSC73M223 Datasheet
45Kb / 6P
   1200 Baud FSK Modem
logo
CML Microcircuits
FX419 CMLMICRO-FX419 Datasheet
367Kb / 7P
   1200 BAUD FFSK MODEM
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com