View LXT304A_76393.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

'$7$ 6+((7
$35,/ iaac
5HYLVLRQ iii
/;7eie$
/RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU ZLWK 5HFHLYH -$
*HQHUDO 'HVFULSWLRQ
The LXT304A is a fully integrated low-power transceiver for both North American 1.544 Mbps (T1), and International 2.048 Mbps (E1) applications. It features a constant low output impedance transmitter allowing for high transmitter return loss in T1/E1 applications. Transmit pulse shapes (DSX-1 or E1) are selectable for various line lengths and cable types. The LXT304A provides receive jitter attenuation starting at 3 Hz, and is microprocessor controllable through a serial interface. It offers a variety of diagnostic features including transmit and receive monitoring. The device incorporates an onchip crystal oscillator, and also accepts digital clock inputs. It uses an advanced double-poly, double-metal CMOS process and requires only a single 5-volt power supply.
)HDWXUHV
/RZ SRZHU FRQVXPSWLRQ oeii P: PD[LPXPo eio OHVV WKDQ WKH /;7eii &RQVWDQW ORZ RXWSXW LPSHGDQFH WUDQVPLWWHU UHJDUGOHVV RI GDWD SDWWHUQ oe W\SLFDOo +LJK WUDQVPLW DQG UHFHLYH UHWXUQ ORVV H[FHHGV (76, (76 eiiicc DQG *iaeie UHFRPPHQGDWLRQV 0HHWV RU H[FHHGV DOO LQGXVWU\ VSHFLILFDWLRQV LQFOXGLQJ ,78 *iaeien $16, 7iieie DQG $7/7 3XE ceeii &RPSDWLEOH ZLWK PRVW SRSXODU 3&0 IUDPHUV /LQH GULYHUn GDWD UHFRYHU\ DQG FORFN UHFRYHU\ IXQFWLRQV 0LQLPXP UHFHLYH VLJQDO RI eii P9 6HOHFWDEOH VOLFHU OHYHOV o(ii'6;io LPSURYH 615 3URJUDPPDEOH WUDQVPLW HTXDOL]HU VKDSHV SXOVHV WR PHHW '6;i SXOVH WHPSODWH IURP i WR cee IW /RFDO DQG UHPRWH ORRSEDFN IXQFWLRQV 7UDQVPLWi5HFHLYH SHUIRUPDQFH PRQLWRUV ZLWK '30 DQG /26 RXWSXWV 5HFHLYHU MLWWHU WROHUDQFH iie 8, IURP ei N+] WR iii N+] 5HFHLYH MLWWHU DWWHQXDWLRQ VWDUWLQJ DW e +] PHHWV 7%5iei ie VSHFLILFDWLRQ 6HULDO FRQWURO LQWHUIDFH $QDORJiGLJLWDO /26 PRQLWRU SHU *iaeaee $YDLODEOH LQ eaSLQ ',3 RU 3/&&
i e e e c ae a a ii ii ie ie ie ie
eei
$SSOLFDWLRQV
3&0i9RLFH &KDQQHO %DQNV 'DWD &KDQQHO %DQNi&RQFHQWUDWRU 7ii(i PXOWLSOH[HU 'LJLWDO $FFHVV DQG &URVVFRQQHFW 6\VWHPV o'$&6o &RPSXWHU WR 3%; LQWHUIDFH o&3, / '0,o +LJKVSHHG GDWD WUDQVPLVVLRQ OLQHV ,QWHUIDFLQJ &XVWRPHU 3UHPLVHV (TXLSPHQW WR D &68 'LJLWDO /RRS &DUULHU o'/&o WHUPLQDOV
/;7eie$ %ORFN 'LDJUDP
MODE Host INT SDI SDO CS SCLK CLKE Hardware EC1 EC2 EC3 RLOOP LLOOP TAOS TPOS TNEG TCLK Control Equalizer Synchronizer Internal Clock Generator Jitter Attenuator Elastic Store Data Latch Receive Monitor Transmit Driver Control MTIP MRING Timing Recovery Data Slicers Line Driver TTIP TRING
MCLK XTALIN XTALOUT RCLK RPOS RNEG LOS DPM
Peak Detector
RTIP RRING
L1
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
3,1 $66,*10(176 / 6,*1$/ '(6&5,37,216
)LJXUH ia 3LQ $VVLJQPHQWV
71(* 7326 7&/. 0&/. &/.(i7$26 6&/.i//223 CSi5/223 02'( 51(* 5326 5&/. ;7$/,1 ;7$/287 '30 e c ae a a ii ii e e e i ea eae ec
7DEOH ia 3LQ 'HVFULSWLRQV
3LQ u i 6\P 0&/. ,i2i ', 'HVFULSWLRQ 0DVWHU &ORFNi $ iieee RU eiiea 0+] FORFN LQSXW XVHG WR JHQHUDWH LQWHUQDO FORFNVi 8SRQ /RVV RI 6LJQDO o/26on 5&/. LV GHULYHG IURP 0&/.i ,I 0&/. LV QRW DSSOLHGn WKLV SLQ VKRXOG EH JURXQGHGi 7UDQVPLW &ORFNi 7UDQVPLW FORFN LQSXWi 7326 DQG 71(* DUH VDPSOHG RQ WKH IDOOLQJ HGJH RI 7&/.i ,I 7&/. LV QRW VXSSOLHGn WKH WUDQVPLWWHU UHPDLQV SRZHUHG GRZQi 7UDQVPLW 3RVLWLYH 'DWDi ,QSXW IRU SRVLWLYH SXOVH WR EH WUDQVPLWWHG RQ WKH WZLVWHGSDLU OLQHi 7UDQVPLW 1HJDWLYH 'DWDi ,QSXW IRU QHJDWLYH SXOVH WR EH WUDQVPLWWHG RQ WKH WZLVWHGSDLU OLQHi 0RGH 6HOHFWi 6HWWLQJ 02'( WR ORJLF i SXWV WKH /;7eie$ LQ WKH +RVW 0RGHi ,Q WKH +RVW 0RGHn WKH VHULDO LQWHUIDFH LV XVHG WR FRQWURO WKH /;7eie$ DQG GHWHUPLQH LWV VWDWXVi 6HWWLQJ 02'( WR ORJLF i SXWV WKH /;7eie$ LQ WKH +DUGZDUH o+i:o 0RGHi ,Q WKH +DUGZDUH 0RGHn WKH VHULDO LQWHUIDFH LV GLVDEOHG DQG KDUGZLUHG SLQV DUH XVHG WR FRQWURO FRQILJXUDWLRQ DQG UHSRUW VWDWXVi 5HFHLYH 1HJDWLYH 'DWDa 5HFHLYH 3RVLWLYH 'DWDi 5HFHLYHG GDWD RXWSXWVi $ VLJQDO RQ 51(* FRUUHVSRQGV WR UHFHLSW RI D QHJDWLYH SXOVH RQ 57,3 DQG 55,1*i $ VLJQDO RQ 5326 FRUUHVSRQGV WR UHFHLSW RI D SRVLWLYH SXOVH RQ 57,3 DQG 55,1*i 51(* DQG 5326 RXWSXWV DUH 1RQ5HWXUQWR=HUR o15=oi %RWK RXWSXWV DUH VWDEOH DQG YDOLG RQ WKH ULVLQJ HGJH RI 5&/.i ,Q WKH +RVW 0RGHn &/.( GHWHUPLQHV WKH FORFN HGJH DW ZKLFK WKHVH RXWSXWV DUH VWDEOH DQG YDOLGi ,Q WKH +DUGZDUH 0RGH ERWK RXWSXWV DUH VWDEOH DQG YDOLG RQ WKH ULVLQJ HGJH RI 5&/.i
'LJLWDO 2XWSXWa $, $QDORJ ,QSXWa $2 $QDORJ 2XWSXWa 6 6XSSO\i
e e e e
7&/. 7326 71(* 02'(
', ', ', ',
c ae
51(* 5326
'2 '2
ii (QWULHV LQ ,i2 FROXPQ DUHa ',
'LJLWDO ,QSXWa '2
eee
/26 77,3 7*1' 79o 75,1* 07,3 05,1*
0&/. 7&/. 7326 71(* 02'( 51(* 5326 5&/. ;7$/,1 ;7$/287 '30 /26 77,3 7*1'
i e e e e c ae a a ii ii ie ie ie
ea eae ec ee ee ee ee ei ei ia ia iae ic ie
&/.(i7$26 6&/.i//223 CSi5/223 6'2i(&e 6',i(&e INTi(&i 5*1' 59o 55,1* 57,3 05,1* 07,3 75,1* 79o
/;7eie$3(
ie ie ie ie ic iae ia
ee ee ee ee ei ei ia
6'2i(&e 6',i(&e INTi(&i 5*1' 59o 55,1* 57,3
/;7eie$1(
L1
3LQ $VVLJQPHQWV / 6LJQDO 'HVFULSWLRQV
7DEOH ia 3LQ 'HVFULSWLRQV FRQWLQXHG
3LQ u a a ii 6\P 5&/. ;7$/,1 ;7$/287 ,i2i '2 $, $2 'HVFULSWLRQ 5HFRYHUHG &ORFNi 7KLV LV WKH FORFN UHFRYHUHG IURP WKH VLJQDO UHFHLYHG DW 57,3 DQG 55,1*i &U\VWDO ,QSXWa &U\VWDO 2XWSXWi $Q H[WHUQDO FU\VWDO RSHUDWLQJ DW IRXU WLPHV WKH ELW UDWH ociiaec 0+] IRU '6;in aiiae 0+] IRU (i DSSOLFDWLRQV ZLWK DQ iaiae S) ORDGo LV UHTXLUHG WR HQDEOH WKH MLWWHU DWWHQXDWLRQ IXQFWLRQ RI WKH /;7eie$i 7KHVH SLQV PD\ DOVR EH XVHG WR GLVDEOH WKH MLWWHU DWWHQXDWRU E\ FRQQHFWLQJ WKH ;7$/,1 SLQ WR WKH SRVLWLYH VXSSO\ WKURXJK D UHVLVWRUn DQG W\LQJ WKH ;7$/287 SLQ WR JURXQGi 'ULYHU 3HUIRUPDQFH 0RQLWRUi '30 JRHV WR D ORJLF i ZKHQ WKH WUDQVPLW PRQLWRU ORRS o07,3 DQG 05,1*o GRHV QRW GHWHFW D VLJQDO IRU ce `e FORFN SHULRGVi '30 UHPDLQV DW ORJLF i XQWLO D VLJQDO LV GHWHFWHGi /RVV RI 6LJQDOi /26 JRHV WR D ORJLF i ZKHQ iaee FRQVHFXWLYH VSDFHV KDYH EHHQ GHWHFWHGi /26 UHWXUQV WR D ORJLF i ZKHQ WKH UHFHLYHG VLJQDO UHDFKHV ieieo RQHV GHQVLW\n EDVHG RQ e RQHV LQ DQ\ eeELW SHULRG ZLWK QR PRUH WKDQ ie FRQVHFXWLYH ]HURVi 7UDQVPLW 7LSa 7UDQVPLW 5LQJi 'LIIHUHQWLDO 'ULYHU 2XWSXWVi 7KHVH ORZ LPSHGDQFH RXW SXWV DFKLHYH PD[LPXP SRZHU VDYLQJV WKURXJK D iaiiie WUDQVIRUPHU o7ion RU D iai oaee o RU iaiiec oiei o WUDQVIRUPHU o(io ZLWKRXW DGGLWLRQDO FRPSRQHQWVi 7R SURYLGH KLJKHU UHWXUQ ORVVn UHVLVWRUV PD\ EH XVHG LQ VHULHV ZLWK D WUDQVIRUPHU DV VSHFLILHG LQ $SSOLFDWLRQ ,QIRUPDWLRQi 7UDQVPLW *URXQGi *URXQG UHWXUQ IRU WKH WUDQVPLW GULYHUV SRZHU VXSSO\ 79oi 7UDQVPLW 3RZHU 6XSSO\i oe 9'& SRZHU VXSSO\ LQSXW IRU WKH WUDQVPLW GULYHUVi 79o PXVW QRW YDU\ IURP 59o E\ PRUH WKDQ `iie 9i 0RQLWRU 7LSa 0RQLWRU 5LQJi 7KHVH SLQV DUH XVHG WR PRQLWRU WKH WLS DQG ULQJ WUDQVPLW RXWSXWVi 7KH WUDQVFHLYHU FDQ EH FRQQHFWHG WR PRQLWRU LWV RZQ RXWSXW RU WKH RXWSXW RI DQRWKHU /;7eie$ RQ WKH ERDUGi 7R SUHYHQW IDOVH LQWHUUXSWV LQ WKH +RVW 0RGH LI WKH PRQLWRU LV QRW XVHGn DSSO\ D FORFN VLJQDO WR RQH RI WKH PRQLWRU SLQV DQG WLH WKH RWKHU PRQLWRU SLQ WR DSSUR[LPDWHO\ WKH FORFN(c)V PLGOHYHO YROWDJHi 7KH PRQLWRU FORFN FDQ UDQJH IURP iii N+] WR WKH 7&/. IUHTXHQF\i 5HFHLYH 7LSa 5HFHLYH 5LQJi 7KH $0, VLJQDO UHFHLYHG IURP WKH OLQH LV DSSOLHG DW WKHVH SLQVi $ FHQWHUWDSSHGn FHQWHUJURXQGHGn eai VWHSXS WUDQVIRUPHU LV UHTXLUHG RQ WKHVH SLQVi 'DWD DQG FORFN IURP WKH VLJQDO DSSOLHG DW WKHVH SLQV DUH UHFRYHUHG DQG RXWSXW RQ WKH 5326i51(* DQG 5&/. SLQVi 5HFHLYH 3RZHU 6XSSO\i oe 9'& SRZHU VXSSO\ IRU DOO FLUFXLWV H[FHSW WKH WUDQVPLW GULY HUVi o7UDQVPLW GULYHUV DUH VXSSOLHG E\ 79oio 5HFHLYH *URXQGi *URXQG UHWXUQ IRU SRZHU VXSSO\ 59oi
'LJLWDO ,QSXWa '2 'LJLWDO 2XWSXWa $, $QDORJ ,QSXWa $2 $QDORJ 2XWSXWa 6 6XSSO\i
ii
'30
'2
ie
/26
'2
ie ic
77,3 75,1*
$2 $2
ie ie iae ia
7*1' 79o 07,3 05,1*
6 6 $, $,
ia ei ei ee
57,3 55,1* 59o 5*1'
$, $, 6 6
ii (QWULHV LQ ,i2 FROXPQ DUHa ',
L1
eee
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
7DEOH ia 3LQ 'HVFULSWLRQV FRQWLQXHG
3LQ u ee 6\P INT ,i2i '2 'HVFULSWLRQ ,QWHUUXSW o+RVW 0RGHoi 7KLV /;7eie$ +RVW 0RGH RXWSXW JRHV /RZ WR IODJ WKH KRVW SURFHVVRU ZKHQ /26 RU '30 JR DFWLYHi INT LV DQ RSHQGUDLQ RXWSXW DQG VKRXOG EH WLHG WR SRZHU VXSSO\ 59o WKURXJK D UHVLVWRUi INT LV UHVHW E\ FOHDULQJ WKH UHVSHFWLYH UHJLVWHU ELW o/26 DQGiRU '30io (TXDOL]HU &RQWURO i o+i: 0RGHoi 7KH VLJQDO DSSOLHG DW WKLV SLQ LQ WKH /;7eie$ +DUGZDUH 0RGH LV XVHG LQ FRQMXQFWLRQ ZLWK (&e DQG (&e LQSXWV WR GHWHUPLQH VKDSH DQG DPSOLWXGH RI $0, RXWSXW WUDQVPLW SXOVHVi 6HULDO 'DWD ,Q o+RVW 0RGHoi 7KH VHULDO GDWD LQSXW VWUHDP LV DSSOLHG WR WKLV SLQ ZKHQ WKH /;7eie$ RSHUDWHV LQ WKH +RVW 0RGHi 6', LV VDPSOHG RQ WKH ULVLQJ HGJH RI 6&/.i (TXDOL]HU &RQWURO e o+i: 0RGHoi 7KH VLJQDO DSSOLHG DW WKLV SLQ LQ WKH /;7eie$ +DUGZDUH 0RGH LV XVHG LQ FRQMXQFWLRQ ZLWK (&i DQG (&e LQSXWV WR GHWHUPLQH VKDSH DQG DPSOLWXGH RI $0, RXWSXW WUDQVPLW SXOVHVi 6HULDO 'DWD 2XW o+RVW 0RGHoi 7KH VHULDO GDWD IURP WKH RQFKLS UHJLVWHU LV RXWSXW RQ WKLV SLQ LQ WKH /;7eie$ +RVW 0RGHi ,I &/.( LV +LJKn 6'2 LV YDOLG RQ WKH ULVLQJ HGJH RI 6&/.i ,I &/.( LV /RZn 6'2 LV YDOLG RQ WKH IDOOLQJ HGJH RI 6&/.i 7KLV SLQ JRHV WR D KLJKLPSHGDQFH VWDWH ZKHQ WKH VHULDO SRUW LV EHLQJ ZULWWHQ WR DQG ZKHQ CS LV +LJKi (TXDOL]HU &RQWURO e o+i: 0RGHoi 7KH VLJQDO DSSOLHG DW WKLV SLQ LQ WKH /;7eie$ +DUGZDUH 0RGH LV XVHG LQ FRQMXQFWLRQ ZLWK (&i DQG (&e LQSXWV WR GHWHUPLQH VKDSH DQG DPSOLWXGH RI $0, RXWSXW WUDQVPLW SXOVHVi &KLS 6HOHFW o+RVW 0RGHoi 7KLV LQSXW LV XVHG WR DFFHVV WKH VHULDO LQWHUIDFH LQ WKH /;7eie$ +RVW 0RGHi )RU HDFK UHDG RU ZULWH RSHUDWLRQn CS PXVW WUDQVLWLRQ IURP +LJK WR /RZn DQG UHPDLQ /RZi 5HPRWH /RRSEDFN o+i: 0RGHoi 7KLV LQSXW FRQWUROV ORRSEDFN IXQFWLRQV LQ WKH /;7eie$ +DUGZDUH 0RGHi 6HWWLQJ 5/223 +LJK HQDEOHV WKH 5HPRWH /RRSEDFN 0RGHi 6HWWLQJ ERWK 5/223 DQG //223 FDXVHV D 5HVHWi 6HULDO &ORFN o+RVW 0RGHoi 7KLV FORFN LV XVHG LQ WKH /;7eie$ +RVW 0RGH WR ZULWH GDWD WR RU UHDG GDWD IURP WKH VHULDO LQWHUIDFH UHJLVWHUVi /RFDO /RRSEDFN o+i: 0RGHoi 7KLV LQSXW FRQWUROV ORRSEDFN IXQFWLRQV LQ WKH /;7eie$ +DUGZDUH 0RGHi 6HWWLQJ //223 +LJK HQDEOHV WKH /RFDO /RRSEDFN 0RGHi &ORFN (GJH o+RVW 0RGHoi 6HWWLQJ &/.( +LJK FDXVHV 5326 DQG 51(* WR EH YDOLG RQ WKH IDOOLQJ HGJH RI 5&/.n DQG 6'2 WR EH YDOLG RQ WKH ULVLQJ HGJH RI 6&/.i :KHQ &/.( LV /RZn 5326 DQG 51(* DUH YDOLG RQ WKH ULVLQJ HGJH RI 5&/.n DQG 6'2 LV YDOLG RQ WKH IDOOLQJ HGJH RI 6&/.i 7UDQVPLW $OO 2QHV o+i: 0RGHoi :KHQ VHW +LJKn 7$26 FDXVHV WKH /;7eie$ o+DUG ZDUH 0RGHo WR WUDQVPLW D FRQWLQXRXV VWUHDP RI PDUNV DW WKH 7&/. IUHTXHQF\i $FWLYDW LQJ 7$26 FDXVHV 7326 DQG 71(* LQSXWV WR EH LJQRUHGi 7$26 LV LQKLELWHG GXULQJ 5HPRWH /RRSEDFNi
'LJLWDO 2XWSXWa $, $QDORJ ,QSXWa $2 $QDORJ 2XWSXWa 6 6XSSO\i
(&i
',
ee
6', (&e
', ',
ee
6'2
'2
(&e
',
ec
CS
',
5/223
',
eae
6&/. //223
', ', ',
ea
&/.(
7$26
',
ii (QWULHV LQ ,i2 FROXPQ DUHa ',
'LJLWDO ,QSXWa '2
eee
L1
)XQFWLRQDO 'HVFULSWLRQ
DUH UHFHLYHG DW 55,1*i 5HFRYHUHG GDWD LV RXWSXW DW 5326 DQG 51(*n DQG WKH UHFRYHUHG FORFN LV RXWSXW DW 5&/.i 5HIHU WR 7HVW 6SHFLILFDWLRQV IRU /;7eie$ UHFHLYHU WLPLQJi 7KH VLJQDO UHFHLYHG DW 5326 DQG 51(* LV SURFHVVHG WKURXJK WKH SHDN GHWHFWRU DQG GDWD VOLFHUVi 7KH SHDN GHWHF WRU VDPSOHV WKH LQSXWV DQG GHWHUPLQHV WKH PD[LPXP YDOXH RI WKH UHFHLYHG VLJQDOi $ SHUFHQWDJH RI WKH SHDN YDOXH LV SURYLGHG WR WKH GDWD VOLFHUV DV D WKUHVKROG OHYHO WR HQVXUH RSWLPXP VLJQDOWRQRLVH UDWLRi )RU '6;i DSSOLFDWLRQV oGHWHUPLQHG E\ (TXDOL]HU &RQWURO LQSXWV (&i (&e iiio WKH WKUHVKROG LV VHW WR aeio RI WKH SHDN YDOXHi 7KLV WKUHVK ROG LV PDLQWDLQHG DERYH ceo IRU XS WR ie VXFFHVVLYH ]HURV RYHU WKH UDQJH RI VSHFLILHG RSHUDWLQJ FRQGLWLRQVi )RU (i DSSOLFDWLRQV o(& LQSXWV iii RU iiio WKH WKUHVKROG LV eioi 7KH UHFHLYHU LV FDSDEOH RI DFFXUDWHO\ UHFRYHULQJ VLJQDOV ZLWK XS WR ieic G% RI DWWHQXDWLRQ oIURP eie 9on FRUUH VSRQGLQJ WR D UHFHLYHG VLJQDO OHYHO RI DSSUR[LPDWHO\ eii P9i 0D[LPXP OLQH OHQJWK LV ieii IHHW RI $%$0 FDEOH oDSSUR[LPDWHO\ c G% RI DWWHQXDWLRQoi 5HJDUGOHVV RI UHFHLYHG VLJQDO OHYHOn WKH SHDN GHWHFWRUV DUH KHOG DERYH D PLQLPXP OHYHO RI ie 9 WR SURYLGH LPPXQLW\ IURP LPSXO VLYH QRLVHi $IWHU SURFHVVLQJ WKURXJK WKH GDWD VOLFHUVn WKH UHFHLYHG VLJ QDO LV URXWHG WR WKH GDWD DQG FORFN UHFRYHU\ VHFWLRQVn DQG WR WKH UHFHLYH PRQLWRUi 7KH GDWD DQG FORFN UHFRYHU\ FLUFXLWV DUH KLJKO\ WROHUDQW ZLWK DQ LQSXW MLWWHU WROHUDQFH VLJQLIL FDQWO\ EHWWHU WKDQ UHTXLUHG E\ 3XE ceeiii 5HIHU WR 7HVW 6SHFLILFDWLRQV IRU DGGLWLRQDO LQIRUPDWLRQi 7KH UHFHLYHU PRQLWRU ORDGV D GLJLWDO FRXQWHU DW WKH 5&/. IUHTXHQF\i 7KH FRXQW LV LQFUHPHQWHG HDFK WLPH D ]HUR LV UHFHLYHGn DQG UHVHW WR ]HUR HDFK WLPH D RQH oPDUNo LV UHFHLYHGi 8SRQ UHFHLSW RI iaee FRQVHFXWLYH ]HURV WKH /26 SLQ JRHV KLJKn DQG D VPRRWK WUDQVLWLRQ UHSODFHV WKH 5&/. RXWSXW ZLWK WKH 0&/.i o,I 0&/. LV QRW VXSSOLHG WKH 5&/. RXWSXW ZLOO EH UHSODFHG ZLWK WKH FHQWHUHG FU\VWDO FORFNio 7KH /26 SLQ LV UHVHW ZKHQ WKH UHFHLYHG VLJQDO UHDFKHV ieieo RQHV GHQVLW\ oe PDUNV LQ ee ELWVo ZLWK QR PRUH WKDQ ie FRQVHFXWLYH ]HURVi 5HFRYHUHG FORFN VLJQDOV DUH VXSSOLHG WR WKH -LWWHU $WWHQXD WRU DQG WKH GDWD ODWFKi 7KH UHFRYHUHG GDWD LV SDVVHG WR WKH (ODVWLF 6WRUH ZKHUH LW LV EXIIHUHG DQG V\QFKURQL]HG ZLWK WKH GHMLWWHUHG UHFRYHUHG FORFN o5&/.oi
)81&7,21$/ '(6&5,37,21
7KH /;7eie$ LV D IXOO\ LQWHJUDWHG 3&0 WUDQVFHLYHU IRU ERWK iieee 0ESV o'6;io DQG eiiea 0ESV o(io DSSOLFD WLRQVi ,W DOORZV IXOOGXSOH[ WUDQVPLVVLRQ RI GLJLWDO GDWD RYHU H[LVWLQJ WZLVWHGSDLU LQVWDOODWLRQVi 7KH /;7eie$ WUDQVFHLYHU LQWHUIDFHV ZLWK WZR WZLVWHGSDLU OLQHVn RQH WZLVWHGSDLU IRU WUDQVPLWn RQH WZLVWHGSDLU IRU UHFHLYHi
3RZHU 5HTXLUHPHQWV
7KH /;7eie$ LV D ORZSRZHU &026 GHYLFHi ,W RSHUDWHV IURP D VLQJOH oe 9 SRZHU VXSSO\ ZKLFK FDQ EH FRQQHFWHG H[WHUQDOO\ WR ERWK WKH WUDQVPLWWHU DQG UHFHLYHUi +RZHYHUn WKH WZR LQSXWV PXVW EH ZLWKLQ ` ie 9 RI HDFK RWKHUn DQG GHFRXSOHG WR WKHLU UHVSHFWLYH JURXQGV VHSDUDWHO\i 5HIHU WR $SSOLFDWLRQ ,QIRUPDWLRQ IRU W\SLFDO GHFRXSOLQJ FLUFXLWU\i ,VRODWLRQ EHWZHHQ WKH WUDQVPLW DQG UHFHLYH FLUFXLWV LV SUR YLGHG LQWHUQDOO\i 'XULQJ QRUPDO RSHUDWLRQn 7$26 RU //223n WKH WUDQVPLWWHU SRZHUV GRZQ LI 7&/. LV QRW VXS SOLHGi
5HVHW 2SHUDWLRQ
8SRQ SRZHU XSn WKH WUDQVFHLYHU LV KHOG VWDWLF XQWLO WKH SRZHU VXSSO\ UHDFKHV DSSUR[LPDWHO\ e 9i 8SRQ FURVVLQJ WKLV WKUHVKROGn WKH GHYLFH EHJLQV D ee PV UHVHW F\FOH WR FDO LEUDWH WKH WUDQVPLW DQG UHFHLYH GHOD\ OLQHV DQG ORFN WKH 3KDVH /RFN /RRS WR WKH UHFHLYH OLQHi $ UHIHUHQFH FORFN LV UHTXLUHG WR FDOLEUDWH WKH GHOD\ OLQHVi 7KH WUDQVPLWWHU UHIHU HQFH LV SURYLGHG E\ 7&/.i 0&/. SURYLGHV WKH UHFHLYHU UHIHUHQFHi ,I WKH FU\VWDO RVFLOODWRU LV JURXQGHGn 0&/. LV XVHG DV WKH UHFHLYHU UHIHUHQFH FORFNi 7KH WUDQVFHLYHU FDQ DOVR EH UHVHW IURP WKH +RVW RU +DUG ZDUH 0RGHi ,Q +RVW 0RGHn UHVHW LV FRPPDQGHG E\ VLPXO WDQHRXVO\ ZULWLQJ 5/223 DQG //223 WR WKH UHJLVWHUi ,Q +DUGZDUH 0RGHn UHVHW LV FRPPDQGHG E\ KROGLQJ 5/223 DQG //223 +LJK VLPXOWDQHRXVO\ IRU eii QVi 5HVHW LV LQL WLDWHG RQ WKH IDOOLQJ HGJH RI WKH UHVHW UHTXHVWi ,Q HLWKHU PRGHn UHVHW FOHDUV DQG VHWV DOO UHJLVWHUV WR i DQG WKHQ EHJLQV FDOLEUDWLRQi
5HFHLYHU
7KH /;7eie$ UHFHLYHV WKH VLJQDO LQSXW IURP RQH WZLVWHG SDLU OLQH RQ HDFK VLGH RI D FHQWHUJURXQGHG WUDQVIRUPHUi 3RVLWLYH SXOVHV DUH UHFHLYHG DW 57,3 DQG QHJDWLYH SXOVHV
-LWWHU $WWHQXDWLRQ
Jitter attenuation of the LXT304A clock and data outputs is provided by a Jitter Attenuation Loop (JAL) and an Elastic Store (ES). An external crystal oscillating at 4 times the bit rate provides clock stabilization. Refer to Application Information for crystal specifications. The ES is a 32 x 2-
L1
eee
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
bit register. Recovered data is clocked into the ES with the recovered clock signal, and clocked out of the ES with the dejittered clock from the JAL. When the bit count in the ES is within two bits of overflowing or underflowing, the ES adjusts the output clock by 1/8 of a bit period. The ES produces an average delay of 16 bits in the receive path. (&6$ VSHFLILFDWLRQV IRU &68 DSSOLFDWLRQVi $ iaiiie WUDQV PLW WUDQVIRUPHU LV XVHG IRU iieee 0ESV V\VWHPVi )RU KLJKHU UHWXUQ ORVV LQ '6;i DSSOLFDWLRQVn XVH aii UHVLV WRUV LQ VHULHV ZLWK D iaeie WUDQVPLW WUDQVIRUPHUi eiiea 0ESV SXOVHV FDQ GULYH FRD[LDO RU VKLHOGHG WZLVWHG SDLU OLQHVi )RU (i V\VWHPVn D iae WUDQVPLW WUDQVIRUPHU DQG VHULHV UHVLVWRUV DUH UHFRPPHQGHGi 7KLV GHVLJQ PHHWV RU H[FHHGV DOO ,78 DQG (76, VSHFLILFDWLRQV IRU WUDQVPLW DQG UHFHLYH UHWXUQ ORVVi $ iai RU iaiiec WUDQVIRUPHU PD\ EH XVHG ZLWKRXW VHULHV UHVLVWRUVi
7UDQVPLWWHU
'DWD UHFHLYHG IRU WUDQVPLVVLRQ RQWR WKH OLQH LV FORFNHG VHUL DOO\ LQWR WKH GHYLFH DW 7326 DQG 71(*i ,QSXW V\QFKURQL ]DWLRQ LV VXSSOLHG E\ WKH WUDQVPLW FORFN o7&/.oi ,I 7&/. LV QRW VXSSOLHG WKH WUDQVPLWWHU UHPDLQV SRZHUHG GRZQn H[FHSW GXULQJ UHPRWH ORRSEDFNi 5HIHU WR 7HVW 6SHFLILFD WLRQV IRU PDVWHU DQG WUDQVPLW FORFN WLPLQJ FKDUDFWHULVWLFVi 7KH WUDQVPLWWHG SXOVH VKDSH LV GHWHUPLQHG E\ (TXDOL]HU &RQWURO VLJQDOV (&i WKURXJK (&e DV VKRZQ LQ 7DEOH ei (TXDOL]HU &RQWURO VLJQDOV PD\ EH KDUGZLUHG LQ WKH +DUG ZDUH PRGHn RU LQSXW DV SDUW RI WKH VHULDO GDWD VWUHDP o6',o LQ WKH +RVW PRGHi 6KDSHG SXOVHV DUH DSSOLHG WR WKH $0, OLQH GULYHU IRU WUDQVPLVVLRQ RQWR WKH OLQH DW 77,3 DQG 75,1*i 7KH OLQH GULYHU SURYLGHV D FRQVWDQW ORZ RXWSXW LPSHGDQFH RI e oW\SLFDOoi 7KLV ZHOO FRQWUROOHG RXWSXW LPSHGDQFH SURYLGHV H[FHOOHQW UHWXUQ ORVV o! ia G%o ZKHQ XVHG ZLWK H[WHUQDO aii SUHFLVLRQ UHVLVWRUV o` io DFFX UDF\o LQ VHULHV ZLWK D WUDQVPLW WUDQVIRUPHU ZLWK D WXUQV UDWLR RI iaeie o` eo DFFXUDF\oi 6HULHV UHVLVWRUV DOVR SURYLGH LQFUHDVHG VXUJH SURWHFWLRQ DQG UHGXFH VKRUW FLUFXLW FXUUHQW IORZi 3XOVHV FDQ EH VKDSHG IRU HLWKHU iieee RU eiiea 0ESV DSSOL FDWLRQVi iieee 0ESV SXOVHV IRU '6;i DSSOLFDWLRQV FDQ EH SURJUDPPHG WR PDWFK OLQH OHQJWKV IURP i WR cee IHHW RI $%$0 FDEOHi 7KH /;7eie$ DOVR PDWFKHV )&& DQG 7DEOH ea (TXDOL]HU &RQWURO ,QSXWV (&e i i i i i i i i (&e i i i i i i i i (&i i i i i i i i i /LQH /HQJWKi i a iee IW $%$0 iee a ecc IW $%$0 ecc a eaa IW $%$0 eaa a eee IW $%$0 eee a cee IW $%$0
'ULYHU 3HUIRUPDQFH 0RQLWRU
The transceiver incorporates a Driver Performance Monitor (DPM) in parallel with TTIP and TRING at the output transformer. The DPM output goes High upon detection of 63 consecutive zeros. It is reset when a one is detected on the transmit line, or when a reset command is received.
/LQH &RGH
The LXT304A transmits data as a 50% AMI line code as shown in Figure 2. The output driver maintains a constant low output impedance regardless of whether it is driving marks or spaces.
2SHUDWLQJ 0RGHV
The LXT304A can be controlled through hard-wired pins (Hardware Mode) or by a microprocessor through a serial interface (Host Mode). The mode of operation is set by the MODE pin logic level. The LXT304A can also be commanded to operate in one of several diagnostic modes.
&DEOH /RVVe iic G% iie G% iia G% eie G% eii G%
$SSOLFDWLRQ
%LW 5DWH
'6;i
iieee 0ESV
,78 5HFRPPHQGDWLRQ *iaeie )&& 3DUW can 2SWLRQ $
(i &RD[ oaee o (i 7ZLVWHGSDLU oiei o &68 o'6io
eiiea 0ESV iieee 0ESV
ii /LQH OHQJWK IURP WUDQVFHLYHU WR '6;i FURVVFRQQHFW SRLQWi ei 0D[LPXP FDEOH ORVV DW aeaee N+]i
eec
L1
)XQFWLRQDO 'HVFULSWLRQ
)LJXUH ea eio $0, &RGLQJ
%LW &HOO 77,3 i 75,1* i i
i
7DEOH ea /;7eie$ 6HULDO 'DWD 2XWSXW %LWV o6HH )LJXUH eo %LW 'e i i i i %LW 'c i i i i i i i i %LW 'ae i i i i i i i i 6WDWXV 5HVHW KDV RFFXUUHGn RU QR SURJUDP LQSXWi 7$26 LV DFWLYHi /RFDO /RRSEDFN LV DFWLYHi 7$26 DQG /RFDO /RRSEDFN DUH DFWLYHi 5HPRWH /RRSEDFN LV DFWLYHi '30 KDV FKDQJHG VWDWH VLQFH ODVW &OHDU '30 RFFXUUHGi /26 KDV FKDQJHG VWDWH VLQFH ODVW &OHDU /26 RFFXUUHGi /26 DQG '30 KDYH ERWK FKDQJHG VWDWH VLQFH ODVW &OHDU '30 DQG &OHDU /26 RFFXUUHGi
+RVW 0RGH 2SHUDWLRQ
7R DOORZ D KRVW PLFURSURFHVVRU WR DFFHVV DQG FRQWURO WKH /;7eie$ WKURXJK WKH VHULDO LQWHUIDFHn 02'( LV VHW +LJKi 7KH VHULDO LQWHUIDFH o6',i6'2o XVHV D icELW ZRUG FRQVLVW LQJ RI DQ aELW &RPPDQGi$GGUHVV E\WH DQG DQ aELW 'DWD E\WHi )LJXUH e VKRZV WKH VHULDO LQWHUIDFH GDWD VWUXFWXUH DQG UHODWLYH WLPLQJi The Host Mode provides a latched Interrupt output (INT) which is triggered by a change in the Loss of Signal (LOS) and/or Driver Performance Monitor (DPM) bits. The Interrupt is cleared when the interrupt condition no longer exists, and the host processor enables the respective bit in the serial input data byte. Host Mode also allows control of the serial data and receive data output timing. The Clock Edge (CLKE) signal determines when these outputs are valid, relative to the Serial Clock (SCLK) or RCLK as listed in Table 3. 7DEOH ea 9DOLG &/.( 6HWWLQJV &/.( /2: 2XWSXW 5326 51(* 6'2 5326 51(* 6'2 &ORFN 5&/. 5&/. 6&/. 5&/. 5&/. 6&/. 9DOLG (GJH 5LVLQJ 5LVLQJ )DOOLQJ )DOOLQJ )DOOLQJ 5LVLQJ
i i i i
7KH /;7eie$ VHULDO SRUW LV DGGUHVVHG E\ VHWWLQJ ELW $e LQ WKH $GGUHVVi&RPPDQG E\WHn FRUUHVSRQGLQJ WR DGGUHVV ici 7KH /;7eie$ FRQWDLQV RQO\ D VLQJOH RXWSXW GDWD UHJLVWHU VR QR FRPSOH[ FKLS DGGUHVVLQJ VFKHPH LV UHTXLUHGi 7KH UHJLVWHU LV DFFHVVHG E\ FDXVLQJ WKH &KLS 6HOHFW oCSo LQSXW WR WUDQVLWLRQ IURP +LJK WR /RZi %LW i RI WKH VHULDO $GGUHVVi &RPPDQG E\WH SURYLGHV 5HDGi:ULWH FRQWURO ZKHQ WKH FKLS LV DFFHVVHGi $ ORJLF i LQGLFDWHV D UHDG RSHUDWLRQn DQG D ORJLF i LQGLFDWHV D ZULWH RSHUDWLRQi 7DEOH e OLVWV VHULDO GDWD RXWSXW ELW FRPELQDWLRQV IRU HDFK VWDWXVi 6HULDO GDWD ,i2 WLP LQJ FKDUDFWHULVWLFV DUH VKRZQ LQ WKH 7HVW 6SHFLILFDWLRQV VHF WLRQi
+,*+
L1
eeae
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
+DUGZDUH 0RGH 2SHUDWLRQ
,Q +DUGZDUH 0RGH WKH WUDQVFHLYHU LV DFFHVVHG DQG FRQ WUROOHG WKURXJK LQGLYLGXDO SLQVi :LWK WKH H[FHSWLRQ RI WKH ,17 DQG &/.( IXQFWLRQVn +DUGZDUH 0RGH SURYLGHV DOO WKH IXQFWLRQV SURYLGHG LQ WKH +RVW 0RGHi ,Q WKH +DUGZDUH 0RGH 5326 DQG 51(* RXWSXWV DUH YDOLG RQ WKH ULVLQJ HGJH RI 5&/.i 7R RSHUDWH LQ +DUGZDUH 0RGHn 02'( PXVW EH VHW /RZi (TXDOL]HU &RQWURO VLJQDOV o(&i WKURXJK (&eo DUH LQSXW RQ WKH ,QWHUUXSWn 6HULDO 'DWD ,Q DQG 6HULDO 'DWD 2XW SLQVi 'LDJQRVWLF FRQWURO IRU 5HPRWH /RRSEDFN o5/223on /RFDO /RRSEDFN o//223on DQG 7UDQVPLW $OO 2QHV o7$26o PRGHV LV SURYLGHG WKURXJK WKH LQGLYLGXDO SLQV XVHG WR FRQWURO VHULDO LQWHUIDFH WLPLQJ LQ WKH +RVW 0RGHi
VLPXOWDQHRXVO\ ZLWK /RFDO /RRSEDFNn EXW LV LQKLELWHG GXULQJ 5HPRWH /RRSEDFNi
5HPRWH /RRSEDFN
,Q 5HPRWH /RRSEDFN o5/223o PRGHn WKH WUDQVPLW GDWD DQG FORFN LQSXWV o7326n 71(* DQG 7&/.o DUH LJQRUHGi 7KH 5326 DQG 51(* RXWSXWV DUH ORRSHG EDFN WKURXJK WKH WUDQVPLW FLUFXLWV DQG RXWSXW RQ 77,3 DQG 75,1* DW WKH 5&/. IUHTXHQF\i 5HFHLYHU FLUFXLWV DUH XQDIIHFWHG E\ WKH 5/223 FRPPDQG DQG FRQWLQXH WR RXWSXW WKH 5326n 51(* DQG 5&/. VLJQDOV UHFHLYHG IURP WKH WZLVWHGSDLU OLQHi
/RFDO /RRSEDFN
'LDJQRVWLF 0RGH 2SHUDWLRQ
7UDQVPLW $OO 2QHV
,Q 7UDQVPLW $OO 2QHV o7$26o PRGH WKH 7326 DQG 71(* LQSXWV WR WKH WUDQVFHLYHU DUH LJQRUHGi 7KH WUDQV FHLYHU WUDQVPLWV D FRQWLQXRXV VWUHDP RI RQHV ZKHQ WKH 7$26 PRGH LV DFWLYDWHGi 7$26 FDQ EH FRPPDQGHG
,Q /RFDO /RRSEDFN o//223o PRGHn WKH UHFHLYHU FLU FXLWV DUH LQKLELWHGi 7KH WUDQVPLW GDWD DQG FORFN LQSXWV o7326n 71(* DQG 7&/.o DUH ORRSHG EDFN RQWR WKH UHFHLYH GDWD DQG FORFN RXWSXWV o5326n 51(* DQG 5&/.o WKURXJK WKH 5[ MLWWHU DWWHQXDWRUi 7KH WUDQVPLW WHU FLUFXLWV DUH XQDIIHFWHG E\ WKH //223 FRPPDQGi 7KH 7326 DQG 71(* LQSXWV oRU D VWUHDP RI RQHV LI WKH 7$26 FRPPDQG LV DFWLYHo ZLOO EH WUDQVPLWWHG QRU PDOO\i
)LJXUH ea /;7eie$ 6HULDO ,QWHUIDFH 'DWD 6WUXFWXUH
CS SCLK
ADDRESS / COMMAND BYTE
DATA INPUT / OUTPUT BYTE
SDI/ SDO
R/W
A0
A1
A2
A3
A4
A5
A6
D0
D1
D2
D3
D4
D5
D6
D7
ADDRESS / COMMAND BYTE
R/W
0 A0
0
0
0
1 A4
0
X A6
R/W- = 1: Read R/W- = 0: Write
127( 2XWSXW GDWD E\WH LV WKH VDPH DV WKH LQSXW GDWD E\WH H[FHSW IRU ELWV 'aeaae! VKRZQ LQ 7DEOH ei
CLEAR INTERRUPTS INPUT DATA BYTE
X=DON'T CARE
SET LOOPBACKS OR RESET
LOS
D0 (LSB)
DFM
EC1
EC2
EC3
REMOTE
LOCAL
TAOS
D7(MSB)
eea
L1
)XQFWLRQDO 'HVFULSWLRQ
7DEOH ea /;7eie$ &U\VWDO 6SHFLILFDWLRQV o([WHUQDOo 3DUDPHWHU )UHTXHQF\ )UHTXHQF\ VWDELOLW\ 7i (i aiiae 0+] ` ei SSP # ee & ` ee SSP IURP ei & WR oae & o5HI ee & UHDGLQJo &/ ii S) WR iaiae S)n o) ae WR iie SSP &/ iaiae S) WR ee S)n ) ae WR iie SSP ei 0D[LPXP $7 3DUDOOHO eii P: )XQGDPHQWDO +&ea o5e:on &2 ae S) PD[LPXP &0 iae I) W\SLFDO ciiaec 0+] ` ei SSP # ee & ` ee SSP IURP ei & WR ae & o5HI ee & UHDGLQJo 3XOODELOLW\ &/ ii S) WR iaiae S)n o) iaee WR iae SSP &/ iaiae S) WR ee S)n ) iaee WR iae SSP (IIHFWLYH VHULHV UHVLVWDQFH ei 0D[LPXP &U\VWDO FXW $7 5HVRQDQFH 3DUDOOHO 0D[LPXP GULYH OHYHO eii P: 0RGH RI RSHUDWLRQ )XQGDPHQWDO &U\VWDO KROGHU +&ea o5e:on &2 ae S) PD[LPXP &0 iae I) W\SLFDO
L1
eea
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
IUDPHU SURYLGLQJ WKH GLJLWDO LQWHUIDFH ZLWK WKH KRVW FRQWURO OHUi %RWK GHYLFHV DUH FRQWUROOHG WKURXJK WKH VHULDO LQWHUIDFHi $Q /;3cii$ &ORFN $GDSWHU o&/$'o SURYLGHV WKH eiiea 0+] V\VWHP EDFNSODQH FORFNn ORFNHG WR WKH UHFRYHUHG iieee 0+] FORFN VLJQDOi 7KH SRZHU VXSSO\ LQSXWV DUH WLHG WR D FRPPRQ EXV ZLWK DSSURSULDWH GHFRXSOLQJ FDSDFLWRUV LQVWDOOHG oca ") RQ WKH WUDQVPLW VLGHn iii ") DQG iii ") RQ WKH UHFHLYH VLGHoi
$33/,&$7,21 ,1)250$7,21 iieee 0ESV 7i ,QWHUIDFH $SSOLFDWLRQ
)LJXUH e LV D W\SLFDO iieee 0ESV 7i DSSOLFDWLRQi 7KH /;7eie$ LV VKRZQ LQ WKH +RVW 0RGH ZLWK D 7ii(6)
)LJXUH ea 7\SLFDO /;7eie$ iieee 0ESV 7i $SSOLFDWLRQ o+RVW 0RGHo
oe9 0RGH 0&/. 6&/. CS INT 6', 6'2 75,1*
6HULDO 3RUW &F 5W eaeii S) 5W 7U 7UDQVPLW /LQH
3
&RQWURO DQG 0RQLWRU
&/.( 0&/. /26 '30
/;7eie$
77,3
)UDPHU
7326 71(* 7&/. 5326 51(* 5&/.
05,1* 07,3 57,3
5U 5U 55,1*
5HFHLYH /LQH e&7ai
/;3cii$ ;7$/287 ;7$/,1 &/., CLKO FSI 2.048 MHz
5*1'
7*1'
59o
79o
NOTE iii ) iii ) oe9 ca )
ii 7\SLFDO YDOXH eaei S)i $GMXVW IRU DFWXDO ERDUG SDUDVLWLFV WR REWDLQ RSWL PXP UHWXUQ ORVVi
eei
L1
$SSOLFDWLRQ ,QIRUPDWLRQ
eiiea 0ESV (i ,QWHUIDFH $SSOLFDWLRQV
Figure 5 is a 2.048 Mbps E1 TWP application using 15 Rt resistors in line with the transmit transformer to provide high return loss and surge protection. When high return loss is not a critical factor, a 1:1 or 1:1.26 transformer without in-line resistors provides maximum power savings. The LXT304A is shown in Hardware Mode with a typical E1/
CRC4 Framer. The hard-wired control lines for TAOS, LLOOP and RLOOP are individually controllable, and the LLOOP and RLOOP lines are also tied to a single control for the Reset function. This configuration is illustrated with a crystal in place to enable the LXT304A Jitter Attenuation Loop, and a single power supply bus.
)LJXUH ea 7\SLFDO /;7eie$ (i eiiea 0ESV iei $SSOLFDWLRQ o+DUGZDUH 0RGHo
0RGH 0&/.
(&i EC2 EC2
/LQH /HQJWK VHWWLQJ
&RQWURO DQG 0RQLWRU
7$26 5/223 //223 /26 '30
&F 77,3
/;7eie$
75,1* 07,3 05,1* 57,3
5W oieo eaeii S) 5W oieo 7U
7UDQVPLW /LQH
)UDPHU
7326 71(* 7&/. 5326 51(* 5&/.
5U 5U 55,1*
5HFHLYH /LQH e&7ai
/;3cii$ ;7$/287 ;7$/,1 CLKO &/., FSI 1.544 MHz
5*1'
7*1'
59o
79o
NOTE iii ) iii ) oe9 ca )
ii 7\SLFDO YDOXH eaei S)i $GMXVW IRU DFWXDO ERDUG SDUDVLWLFV WR REWDLQ RSWL PXP UHWXUQ ORVVi
L1
eei
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
'e &KDQQHO %DQN $SSOLFDWLRQV
Existing D4 Channel Bank architectures frequently employ: (1) a plug-in card for T1 pulse generation (6.0 V peak); and (2) a separate card for pulse shaping and Line Build-Out (LBO). The LXT304A integrates the functions of both cards on a single chip producing a DSX-1 compatible, 3.0 V peak output pulse with a standard transformer. In new designs, the LXT304A can replace two cards with one. However, the LXT304A is also compatible with ex7DEOH ca 7ii(i ,QSXWi2XWSXW &RQILJXUDWLRQV %LW 5DWH o0ESVo iieee o7io &U\VWDO ;7$/ &DEOH oo 5Ue oo eii (&eieii
isting dual-card architectures. With an appropriate output transformer, the LXT304A can produce full 6.0 V peak amplitude pulses suitable for D4 Channel Bank applications with separate pulse shaping/LBO cards. To achieve the 6.0 V peak output, the FCC Part 68-010 Equalizer Code setting is used. (EC = 010.) With the standard 1:1.15 transformer, this code produces a 3.0 V peak pulse. However, doubling the transformer turns ratio to 1:2.30 produces the desired 6.0 V peak pulse.
7UDQVPLW 7UDQVIRUPHUi o7Uo iaiiie iae iaeie iaeie iaiiec iae iai iae iai iae iai iae
5We oo i aii aii i i aii i iie i aii ii ieie
7\SLFDO 7; 5HWXUQ /RVVe oG%o iie ia ia ie iie ie iie ia iie ia e ii
&F o)o iieae i i iieae iieae i iieae i iieae i i i
/;&ciaec iii
iiiii iiiii iiiiie
eiiea o(io
/;&aiae iei
eei
iiiii iiiii iiiii iiiii iiiii iiiii iiiii iiiii
aee
iei
1. Transformer turns ratio accuracy is 2%. 2. Rr and Rt values are 1%. 3. Typical return loss, 51 kHz to 3.072 MHz band. 4. D4 Channel Bank application.
eee
L1
7HVW 6SHFLILFDWLRQV
7(67 63(&,),&$7,216
127( 7KH PLQLPXP DQG PD[LPXP YDOXHV LQ 7DEOHV ae WKURXJK ie DQG )LJXUHV c WKURXJK ii UHSUHVHQW WKH SHUIRUPDQFH VSHFLILFD WLRQV RI WKH /;7eie$ DQG DUH JXDUDQWHHG E\ WHVWn H[FHSW ZKHUH QRWHG E\ GHVLJQi 7DEOH aea $EVROXWH 0D[LPXP 5DWLQJV 3DUDPHWHU '& VXSSO\ oUHIHUHQFHG WR *1'o ,QSXW YROWDJHn DQ\ SLQi ,QSXW FXUUHQWn DQ\ SLQe 6WRUDJH WHPSHUDWXUH 6\P 59on 79o 9,1 ,,1 767* &$87,21 0LQ iie 5*1' iie ii ce 0D[ cii 59o o iie ii iei 8QLWV 9 9 P$ &
2SHUDWLRQV DW RU EH\RQG WKHVH OLPLWV PD\ UHVXOW LQ SHUPDQHQW GDPDJH WR WKH GHYLFHi 1RUPDO RSHUDWLRQ LV QRW JXDUDQWHHG DW WKHVH H[WUHPHVi
ii ([FOXGLQJ 57,3 DQG 55,1* ZKLFK PXVW VWD\ EHWZHHQ c9 DQG o59o o iieo 9i ei 7UDQVLHQW FXUUHQWV RI XS WR iii P$ ZLOO QRW FDXVH 6&5 ODWFK XSi 77,3n 75,1*n 79o DQG 7*1' FDQ ZLWKVWDQG D FRQWLQXRXV FXUUHQW RI iii P$i
7DEOH aa 5HFRPPHQGHG 2SHUDWLQJ &RQGLWLRQV DQG &KDUDFWHULVWLFV 3DUDPHWHU '& VXSSO\i $PELHQW RSHUDWLQJ WHPSHUDWXUH
ii 79o PXVW QRW H[FHHG 59o E\ PRUH WKDQ iie 9i
6\P 59on 79o 7$
0LQ eiaee ei
7\S eii ee
0D[ eiee ae
8QLWV 9 &
7DEOH aa (OHFWULFDO &KDUDFWHULVWLFV o8QGHU 5HFRPPHQGHG 2SHUDWLQJ &RQGLWLRQVo 3DUDPHWHU 7RWDO SRZHU GLVVLSDWLRQine +LJK OHYHO LQSXW YROWDJHene oSLQV ien iin eeeao /RZ OHYHO LQSXW YROWDJH
ene
6\P 3' 9,+ 9,/ 92+
0LQ eii eie
0D[ eii iia
8QLWV P: 9 9 9
7HVW &RQGLWLRQV iiio RQHV GHQVLW\ / PD[LPXP OLQH OHQJWK # eiee 9
oSLQV ien iin eeeao oSLQV can iin ien een eeo
+LJK OHYHO RXWSXW YROWDJH
ene
,287
eii $
ii Power dissipation while driving 75 load over operating temperature range. Includes device and load. Digital input levels are within 10% of the supply rails and digital outputs are driving a 50 pF capacitive load. 2. Functionality of pins 23 and 25 depends on mode. See Host/Hardware Mode descriptions. 3. Output drivers will output CMOS logic levels into CMOS loads. 4. Except MTIP and MRING ILL = 50 A.
L1
eee
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
7DEOH aa (OHFWULFDO &KDUDFWHULVWLFV o8QGHU 5HFRPPHQGHG 2SHUDWLQJ &RQGLWLRQVo FRQWLQXHG 3DUDPHWHU /RZ OHYHO RXWSXW YROWDJHene oSLQV can iin ien een eeo ,QSXW OHDNDJH FXUUHQW
e e
6\P 92/ ,// ,e/
0LQ ii ii
0D[ iie oii oii
8QLWV 9 $ $
7HVW &RQGLWLRQV ,287 iic P$
7KUHHVWDWH OHDNDJH FXUUHQW oSLQ eeo
ii Power dissipation while driving 75 load over operating temperature range. Includes device and load. Digital input levels are within 10% of the supply rails and digital outputs are driving a 50 pF capacitive load. 2. Functionality of pins 23 and 25 depends on mode. See Host/Hardware Mode descriptions. 3. Output drivers will output CMOS logic levels into CMOS loads. 4. Except MTIP and MRING ILL = 50 A.
7DEOH iia $QDORJ &KDUDFWHULVWLFV o8QGHU 5HFRPPHQGHG 2SHUDWLQJ &RQGLWLRQVo 3DUDPHWHU $0, RXWSXW SXOVH DPSOLWXGHV '6;i (i 0LQ eie eiae ieic eii /RVV RI 6LJQDO WKUHVKROG 'DWD GHFLVLRQ WKUHVKROG '6;i (i $OORZDEOH FRQVHFXWLYH ]HURV EHIRUH /26 ,QSXW MLWWHU WROHUDQFH
eie
7\Si eii eii aee iie aei ei iaee e
0D[ eic eie iiii iiiee iiiee iiie aeae eae iai
8QLWV 9 9 8, 8, 8, 8, G% P9 9 o SHDN o SHDN 8, +] G% G% G% G%
7HVW &RQGLWLRQV PHDVXUHG DW WKH '6; PHDVXUHG DW OLQH VLGH
5HFRPPHQGHG RXWSXW ORDG DW 77,3 DQG 75,1* ii +] a N+] -LWWHU DGGHG E\ WKH WUDQVPLWWHUe a N+] ei N+] ii +] ei N+] %URDG %DQG 6HQVLWLYLW\ EHORZ '6; oi G% eie 9o
ce ee ici iie
ii N+] iii N+]
e
-LWWHU DWWHQXDWLRQ FXUYH FRUQHU IUHTXHQF\ 0LQLPXP UHWXUQ ORVV
7UDQVPLW 0LQ 7\S ei N+] iie N+] iie N+] eiiea N+] eiiea N+] eiiaee N+] ia ia ia
5HFHLYH 0LQ 7\S ei ei ei
ii 7\SLFDO YDOXHV DUH PHDVXUHG DW ee & DQG DUH IRU GHVLJQ DLG RQO\a QRW JXDUDQWHHG DQG QRW VXEMHFW WR SURGXFWLRQ WHVWLQJi ei ,QSXW VLJQDO WR 7&/. LV MLWWHUIUHHi
3. Circuit attenuates jitter at 20 dB/decade above the corner frequency. 4. In accordance with ITU G.703/ETS 300166 return loss specifications when wired per Figure 7 (E1). 5. Guaranteed by design.
eee
L1
7HVW 6SHFLILFDWLRQV
)LJXUH ca 7\SLFDO 5HFHLYH ,QSXW -LWWHU 7ROHUDQFH o/RRS 0RGHo
iiiii 8,
ieii 8, iiii 8,
iea 8, iii 8,
-LWWHU
ea 8, ii 8,
3XE ceeii 'HF iaai
/;7eie$ 3HUIRUPDQFH
i 8, iie 8, iii 8, ii +] iii +] eii eii i N+]
iie 8, ei N+] ii N+] iii N+]
i +]
)UHTXHQF\
)LJXUH aea /;7eie$ 5HFHLYH -LWWHU 7UDQVIHU 3HUIRUPDQFH o7\SLFDOo
ei G% $7/7 ceeii 7HPSODWH 6ORSH HTXLYDOHQW WR ei G% SHU GHFDGH &&,77 *iaeee 7HPSODWH 6ORSH HTXLYDOHQW WR ei G% SHU GHFDGH
iie G% i e +] i G% ii G%
iie G% i ei +]
*DLQ
iaie G% i eii +]
ei G% ei G% ei G% ci G% ii +] ei +] ii +] ii +]
iaie G% i iii +]
$7/7 ceeii 7HPSODWH 6ORSH HTXLYDOHQW WR ei G% SHU GHFDGH 7\SLFDO /;7eie$ 3HUIRUPDQFH
ieei +] ii +] ii +] ii +]
)UHTXHQF\
L1
eee
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
7DEOH iia /;7eie$ 5HFHLYH 7LPLQJ &KDUDFWHULVWLFV o6HH )LJXUH ao 3DUDPHWHU 5HFHLYH FORFN GXW\ F\FOH 5HFHLYH FORFN SXOVH ZLGWK 5326i51(* WR 5&/. ULVLQJ VHWXS WLPH 5&/. ULVLQJ WR 5326i51(* KROG WLPH '6;i (i '6;i (i '6;i (i 6\P 5&/.G W3: W3: W685 W685 W+5 W+5 0LQ ei 7\Si eee eee eaee iae eaee iae 0D[ ci 8QLWV o QV QV QV QV QV QV 7HVW &RQGLWLRQV
ii 7\SLFDO YDOXHV DUH DW ee & DQG DUH IRU GHVLJQ DLG RQO\a WKH\ DUH QRW JXDUDQWHHG DQG QRW VXEMHFW WR SURGXFWLRQ WHVWLQJi
)LJXUH aa /;7eie$ 5HFHLYH &ORFN 7LPLQJ 'LDJUDP W3: W3:+ 5&/. W685 5326 51(* 5326 51(* W685 W+5
+RVW 0RGH
W3:/
W+5 +RVW 0RGH
&/.( i
&/.(
+i: 0RGH
in /
eec
L1
7HVW 6SHFLILFDWLRQV
7DEOH iea /;7eie$ 0DVWHU &ORFN DQG 7UDQVPLW 7LPLQJ &KDUDFWHULVWLFV o6HH )LJXUH ao 3DUDPHWHU 0DVWHU FORFN IUHTXHQF\ 0DVWHU FORFN WROHUDQFH 0DVWHU FORFN GXW\ F\FOH &U\VWDO IUHTXHQF\ '6;i (i 7UDQVPLW FORFN IUHTXHQF\ 7UDQVPLW FORFN WROHUDQFH 7UDQVPLW FORFN GXW\ F\FOH 7326i71(* WR 7&/. VHWXS WLPH 7&/. WR 7326i71(* KROG WLPH '6;i (i '6;i (i 6\P 0&/. 0&/. 0&/.W 0&/.G IF IF 7&/. 7&/. 7&/.W 7&/.G W687 W+7 0LQ ei ii ee ee 7\Si iieee eiiea `iii ciiaec aiiae iieee eiiea `ei 0D[ ci ai 8QLWV 0+] 0+] SSP o 0+] 0+] 0+] 0+] SSP o QV QV
ii 7\SLFDO YDOXHV DUH DW ee & DQG DUH IRU GHVLJQ DLG RQO\a WKH\ DUH QRW JXDUDQWHHG DQG QRW VXEMHFW WR SURGXFWLRQ WHVWLQJi
)LJXUH aa /;7eie$ 7UDQVPLW &ORFN 7LPLQJ 'LDJUDP
7&/. W687 7326 71(* W+7
L1
eeae
/;7eie$ /RZ3RZHU 7ii(i 6KRUW+DXO 7UDQVFHLYHU
7DEOH iea /;7eie$ 6HULDO ,i2 7LPLQJ &KDUDFWHULVWLFV o6HH )LJXUHV ii DQG iio 3DUDPHWHU 5LVHi)DOO WLPH DQ\ GLJLWDO RXWSXW 6', WR 6&/. VHWXS WLPH 6&/. WR 6', KROG WLPH 6&/. ORZ WLPH 6&/. KLJK WLPH 6&/. ULVH DQG IDOO WLPH CS WR 6&/. VHWXS WLPH 6&/. WR CS KROG WLPH CS LQDFWLYH WLPH 6&/. WR 6'2 YDOLG 6&/. IDOOLQJ HGJH RU CS ULVLQJ HGJH WR 6'2 KLJK = 6\P W5) W'& W&'+ W&/ W&+ W5n W) W&& W&&+ W&:+ W&'9 W&'= 0LQ ei ei eei eei ei ei eei 7\Si iii 0D[ iii ei eii 8QLWV QV QV QV QV QV QV QV QV QV QV QV 7HVW &RQGLWLRQV /RDG iic P$n ei S)
ii 7\SLFDO YDOXHV DUH DW ee & DQG DUH IRU GHVLJQ DLG RQO\a WKH\ DUH QRW JXDUDQWHHG DQG QRW VXEMHFW WR SURGXFWLRQ WHVWLQJi
)LJXUH iia /;7eie$ 6HULDO 'DWD ,QSXW 7LPLQJ 'LDJUDP
&6 W&+ W&&+ W&/ W&:+
6&/.
W&&
W'& 6', /6%
W&'+ /6% &21752/ %<7( '$7$ %<7(
W&'+ 06%
)LJXUH iia /;7eie$ 6HULDO 'DWD 2XWSXW 7LPLQJ 'LDJUDP
&6 W&'= 6&/. W&'9
&/.( i
W&'=
6'2
+,*+ =
W&'9
&/.( i
6'2
+,*+ =
eea
L1

▲Up To Search▲

Price & Availability of LXT304A

	To Download LXT304A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .