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Sierra

SC11026 Datasheet Preview

SC11026 Datasheet

2400 Bit Per Second Modem Analog Peripher

No Preview Available !

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STERRASEMICONDUCTOR
sc11026
2400BitPerSeconMdodemAnalogPeripheral
FEATURES
! Complete 2400 bps modem
conforming to V a' bis
O Compatible with CCITT
Vl2 bis, V23,V 22, V.21 and
Bell 212,{ and 103standards
tr Analog, digital, and remote
digital loopback
I Pin c.ompatiblewith SCl1006
GEXERAL DESCRIPTIOX
The SCl 1026is a complae 2400 bps
modem IC containing all modem
functions except thc adaptive
eqtralizer. It is used in conjunction
with an external controller such as
the Sierra SC1l021 series ROMless
controllers for customized firm-
ware,to implement a 2400bps full
duplex modem,.ompatible with
the CCITT V.22 bis recommenda-
tion. The controller performs all
SLOCK DIAGRAII
3 lntegrated DTMF/Cuard Tone
Ccnerators, call progress
monitor
E Contains an on-chip hybrid
E Programmable audio output
D CMOS tc'chnology
D DIP or PLCC packages
modem control and handshaking
functions as wcll as the adaptive
cqualization.The SCl1026 is pin
c o m p a t i b l cw i t h t h e S C 1 1 0 0 6M A P .
The SC11026operates in 2400 bps
QPSK/QAM and 1200bps [5K as
well as 0 to 300 baud FSK modes
c o m p a t i b l cw i t h B e l l 1 0 3a n d 2 1 2 , A .
as well as CCITT V.21, V.22, V.23
and V.22 bis standards. The
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S,Cll026also opcratesin V.23 an-
swcr and originatc modcs rvith a
buffcrcd DTE intcrface that allorr's
thc DTE to operate at 1200 bps in
both dirc'ctionswhile thc modcm
operatcs at 1200/75 bps. lVhcn
uscd with thc SCl1021controllcrs,
t h c S C I 1 0 2 6b c c o m e sa n i n t c l l i g c n t
modcm controlled by thc industn
standard "AT" command sct.
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Sierra

SC11026 Datasheet Preview

SC11026 Datasheet

2400 Bit Per Second Modem Analog Peripher

No Preview Available !

\(o{ FUNCTIOXAL DESCRIPTION OF THE SCl'IO24 IIODEII
t-{ The SC11025i4cludes:
U(tfn D Full transmitter consisting of
strcam must bc made. Thc asYnc/
sync converler accepts asynchro-
nous serial data clocked at a rate
definc onc of thc four signaling
elements associatcdwith the new
quadrant.
- Async to SYncconverter
between 2400/1200 Hz +2.39",
- Scrambler
-2.59o. lt outputs serial data at a In the 1200bps data rate, the data
- Data encoder
- 757o sQuare root of raised
fixed rate of 24A0/12C01f2fi.01q"
derived from themasterclockoril-
streanr is dividcd into grouPs of
t w o c o n s e c u t i v cb i t s ( d i b i t s ) , T h e
cosine pulse shaper
lator. To compensatefor the inPut dibits are uscd to detcrmine the
- Quadrature modulator
- FSK (Bell 103and CCITT V.21)
and output rate differences,a stoP
bit is either deleted or inserted
phase quadrant changc relative to
the quadrant occuPicd bY the Pre
modulator
when necessary. lf the input data ceding signal clemcnt. Thc result-
- Hybrid
tr High band and low band filters
ratc is slowerthan thc outPut data
rate, a stop bit is ins€rted. lf the
ing signaling clcments from the
inphasc (l) and quadrature (Q)
D High band and low band com- input data rate is faster than the channels arc passedthrough base
promise equalizers
output data ratc, a stoP bit is band filters with a square root of
ll V.22notch filter(selectableat 550 delcted. The output of the async/ raised cosine shape. The filtered
or 1800Hz)
sync converter is applied to the signals subsequcntlYmodulate
D Transmit smoothingfilter
scramblcr.
sine and cosinccarriers,and add to
I Programmable attenuator for
form the QAM/QPSK signal. The
transmit level adjust
The scramblerisa l7-bit shift rcgis- wave-shapcd signal is then passed
a DTMF, 550Hz, 1300Hz, i800 Hz. tcr clcrcked at 240o/ 1200 Hz. Out- t h r o u g h c i t h c r t h c l o r v - b a n d o r
and 2100 Hz tone generator
puts from the l4th.and lTth stages high-band filtcr, dcpcnding uPon
n Transmit clock circuit for sYn- a r c e x c l u s i v e O R ' d a n d f u r t h c r originalc or ansrr'crmode selrtion.
c h r o n o u s o p e r a t i o n ( s l a v e , e x c l u s i v eO R ' d w i t h t h e i n p u t d a t a .
external, and internal modes)
The resultantdata is applied to the For low specd operation, the FSK
! Pattern generator for generating D i n p u t o f t h e s h i f t r c g i s t e r . m o d u l a t o r i s u s c d . l t p r o d u c e so n e
fixed digital patterns in hand- Outputs from the first fourltwo
of four prccision frcquencies,de-
shaking modc
i j Reccivesectionconsisting of
- 54-step programmable gain
controller(PCC)
- E n e r g ' yd e t e c t o ra t t h c o u t P u t
of the PCC
- Hilbert transformer
- Q u a d r a t u r e d c n r o du l a t o r ( fr e e
running carricr)with low pass
filters
Baud tinring rccovery circuit
(samplingclockof 600Hz)
- FSKdcmodulator
- Tone detector
- Syncto Asyncconvcrter
8-bit analog to drgital converter
(ADC)
r : Control and Status registers
, . 8-bit micropr()cessorinterface
with interrupt and multiplexed
address/data lines
i ; A u d i o o u t p u t w i t h l e v e la d j u s t
Tranrmitler
Sincedata termrnalsand comput-
crs may not have the timing
accuracy rcquired for 24ffi/1200
b p s t r a n s m i s s i o n( 0 . 0 1 % ) ,t i m i n g
corrcction on the incoming data
s t a g e so f t h e s h i f t r c g i s t c r f o r m t h e
quad/dibit that is applied to the
QAM/QtsK modulator. The pur-
p o s eo f t h e r r a m b l e r i s t o r a n d o m -
ize data so that the cnergy of the
modulateri canicr is spread over
t h e b a n d o f i n t e r c s t - - - - c i t h e rt h e
high band, ccntercd at 24AJ Hz, or
t h e l o w b a n d .c e n t € r c da t 1 2 0 0H z .
ln the 2400bps mode, thc modem
actually sendsfour bits at a time,
calleda quadbit. Theactual rateof
transmissionfor a quadbit is 600
baud. This is theoptimum rateof
transmission ovcr the gencral
switchcd telephoncnctwork for a
full duplcx FDM (frcqucncy divi-
s i o n m u l t i p l e x i n g )m o d e m b e c a u s e
band limit filtcrs in thc central
officc cut oif at about 3tXlXH) z.
ln the 2400bps data ratc, the data to
be transmitted rs divided into
groups of four consecutive bits
(quadbits).Thc first two bits of the
quadbit are encoded as a phase
quadrant changerclative to the
quadrant occupicdby thc preccd-
i n g s i g n a l e l c m e n t .T h c l a s tt w o b i t s
p e n d i n g u p x r no r i g i n a t eo r a n s w e r
m o d c s c l c c t i o na n d t h e I ( m a r k )o r
0 ( s p a c c )l e v c l o f t h c t r a n s m i td a t a '
Differcnt frcquencics are used for
V . 2 1 .V . 2 3a n d t s c l l1 0 3m o d e s .T h e
frequenciesare produced from the
mastcr clot'k oscillator using pro-
grammabledividers. The dividers
respond quickly to data changes,
introducing ncgligible bit titter
whilc marntainrngphase coher-
cnce. The output of the FSK
modulator is applicd to thc aPPro-
priate filter n'hen thc lorv sPeeo
m o d c o i t h c ( ) p c r a t i o nr s s c l c c t e d '
T h e f i l t c r s t ' c t i o nc o n s i s t so f l o w -
band (1200 Hz) and high-band
Q 4 0 0 H d f i l t c r s .h a l f < h a n n e lc o m -
promise amplitudc and grouP
delay equalizers for both bands'
smoothing filters for both bands,
and multiplexersfor routing of the
transmit and receive signals
through the appropriate band
filters. For CCITT V,22bis applica-
tions,a notch filtcr is includedthat
can be programnrcd for cither 5S
H z o r 1 8 0 0H z . l n t h e c a l l P r o g r d s
2t2A


Part Number SC11026
Description 2400 Bit Per Second Modem Analog Peripher
Maker Sierra
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SC11026 Datasheet PDF






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