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PDF SC14425 Data sheet ( Hoja de datos )
| Número de pieza | SC14425 | |
| Descripción | Complete Baseband processor for DECT Base Stations with Caller-id and Handsfree | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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PRELIMINARY
FEBRUARY 2000
SC14425
Complete Baseband processor for DECT Base Stations
with Caller-id and Handsfree
General Description
The SC14425SC14425 is a 3.3 Volt CMOS IC optimized
to handle all the audio, signal and data processing needed
within a DECT base station. An ADPCM transcoder, a
very low power 14 bit Codec and Analog Frontend are in-
tegrated. Direct connections towards analog or ISDN line
interface.
The SC14425 has an on-chip dedicated flexible DSP op-
timized for telecom applications caller-id, handsfree and
allows easy connection to digital telephone answering
machine devices.
The SC14425 is designed to be compatible with many
radio interfaces. A dedicated TDMA controller handles all
physical layer slot formats and radio control. The integrat-
ed National Semiconductor’s standard CR16B processor
core takes care of all the higher protocol stack. Program-
mable I/O ports can be configured as chip selects for I/O
expanders, Serial Flashes, interrupt source or I/O. A dig-
ital serial interface can be configured to interface to indus-
try-standard c odecs and ISDN devices withµ-Law, a-Law,
linear or transparent data formats.
Features
n Integrated DECT base band transceiver optimized for
GAP base stations according to ETS 300 175-2,3 & 8.
n 2.7 to 3.3 Volt operating voltage.
n Embedded 16 bit CompactRISCTM CR16B Microproc-
essor with In System Emulation (ISE) mode.
n On-chip 6kByte Data Memory.
n Embedded flexible dedicated DSP executing Caller-id
(CID), Caller-id on Call Waiting (CIDCW) and hands-
free, two echo cancellers, two echo suppressors, ex-
tended DTMF detection, DTMF generation, sidetone
and artificial echo loss.
n Two full duplex 32 kbits/sec ADPCM transcoder.
n On-chip Dedicated Instruction Processor (DiP) for all
TDMA based events, which supports 1.152MHz,
0.576MHz and 0.288MHz data rates.
n Protected and unprotected full and double slot B-fields
n Standard DECT encryption with different keys for
different MAC-connections.
n At least 6 MAC connections can be handled simultane-
ously.
n Flexible three wire interface to radio front synthesizer.
n One 14-bit linear CODEC with programmable gain
n Peak hold ADC for RSSI measurement
n Two input 8 bit successive approximation ADC.
n Three general purpose I/O ports with programmable in-
terrupts
n Full duplex UART, SPITM and MICROWIRETM interface.
n Flexible 8 kHz synchronous Serial interface to external
codecs and ISDN interface circuits.
n Two general purpose timers and watch dog timer.
n Programmable chip selects to 8 bit wide ROM, SRAM
NAND Flash Memory and I/O expanders.
n Two Capture timers for frequency measurement for
e.g. metering, ringing and call progress tone detection.
n 100 pin TQFP-100 package.
Note 1: CompactRISCTM is a trademark of National Semiconductor Cor-
poration, SPIT M is a trademark of Motorola.
________________________________________________________________________________________________
System Diagram
sc14404
sc14404
sc14404
sc14404
Copyright 2000 National Semiconductor Corp.
sc14425
CID
Handsfree
sc14404
1
ISDN or
Data
Interface
ISDN
PSTN
PSTN1
Interface
PSTN2
PSTN
Interface
www.national.com
1 page  
2.0 Product status definitions
Definition of Terms
Data Sheet
Identification
Advance Information
Preliminary
No Identification Noted
Obsolete
Product Status
Definition
Formative or In Design
First Production
Full Production
Not In Production
This data sheet contains the design specifications for product
development. Specifications may change in any manner without
notice.
This data sheet contains preliminary data. Supplementary data will
be published at a later date. National Semiconductor Corporation
reserves the right to make changes at any time without notice in
order to improve design and supply the best possible product.
This data sheet contains final specifications. National Semiconduc-
tor Corporation reserves the right to make changes at any time
without notice in order to improve design and supply the best possi-
ble product.
This data sheet contains specifications on a product that has been
discontinued by National Semiconductor Corporation. The datash-
eet is printed for reference information only.
National Semiconductor B.V reserves the right to make changes without notice to any products herein to improve reliability,
function or design. National does not assume any liability arising out of the application or use of any product or circuit de-
scribed herein; neither does it convey any license under its patent rights, nor the right of others.
________________________________________________________________________________________________
.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and whose failure to per-
form, when properly used in accordance with instructions
for use provided in the labeling, can be reasonably ex-
pected to result in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
National Semiconductor
Corporation
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: [email protected]
National Semiconductor
Europe
Fax:
(+49) 0-180-530 85 86
Email: [email protected]
Deutsch Tel:
(+49) 0-180-530 85 85
English Tel:
(+49) 0-180-532 78 32
National Semiconductor
Asia Pacific
Customer Response Group
Tel: 65-254-4466
Fax: 65-250-4466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5620-6175
Fax: 81-3-5620-6179
Copyright 2000 National Semiconductor Corp.
5
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| PDF Descargar | [ Datasheet SC14425.PDF ] | |
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