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xecom (1) XE056LCC XE056LCC february 2005 surface-mount slim-link ? daa for 56k bps data transfer description the XE056LCC is a complete telephone line interface or daa supporting 56k bps data transfer in a leadless, surface-mount package. it is an alternative to discrete daa?s for high-speed dial- up communications. the XE056LCC replaces 25 to 30 discrete components. in spite of being less than 1 inch square, the XE056LCC does not sacrifice performance for its small size and surface-mount convenience. the wide bandwidth, low distortion design supports data transfer with even v.90 and v.92 modulation. the XE056LCC includes the telephone line transformer, loop current holding circuit, hook- switch and ring indicator. the XE056LCC complies with fcc part 68 rules for direct connection to the telephone line. features * leadless design compatible with a 68-pin plcc footprint for high-volume assembly * meets line interface requirements for reliable voice, audio and data communications; * typical total harmonic distortion -77 db ; * fcc part 68 compliant; * integrated low-distortion telephone line transformer * ring detection; * operates on a single +5 volt or + 3 volt power supply; * solid-state hook-switch control; * internal metallic surge protection provided; * extended temperature ranges available; XE056LCC block diagram tip ri ng hook-switch loop curre nt holding circuit tr ans- former /oh t1 t2 ri ring detect mov
xecom (2) XE056LCC XE056LCC mechanical specifications inches mm dim min max min max a 0.945 0.955 24.00 24.26 b 0.945 0.955 24.00 24.26 c 0.340 0.350 8.64 8.89 d 0.095 0.105 2.41 2.67 e 0.795 0.805 20.19 20.45 f 0.070 0.080 1.90 2.03 g 0.095 0.105 2.41 2.67 top botto m a b c d e f gg
xecom (3) XE056LCC XE056LCC pcb layout recommendations typical dim (inches) description a 0.100 pad length b 0.045 pad width c 0.100 pad-to-pad spacing d 0.800 pin 1 to pin 9 spacing e 0.950 row-to-row spacing the XE056LCC is a leadless part. the pads on your printed circuit board must align with the pads on the bottom of the daa mdule. below is the recommended pcb layout. do not place trace or components under the daa as this could compromise the network isolation. a b c d e c
xecom (4) XE056LCC pin name description 1 n/c no connection 2 ring ring is half of the two-wire telephone line connection (rj11 pin 4). fcc part 68 rules require a 1500 volt isolation barrier between the phone line and all other circuits. this isolation must be preserved through- out the system. xecom recommends 0.100 inch spacing between the tip and ring traces and all other conductors to preserve this isolation. XE056LCC pin descriptions 3 tip tip is the other half of the two-wire telephone line connection (rj11 pin 3). the telephone company places a dc "battery" voltage across tip and ring on all public switched telephone lines. the XE056LCC works regarless of the polarity of the battery voltage. 4-9 n/c no connection 10 gnd ground connection to the XE056LCC. pin 10 supplies the reference for the ri input and /oh output and should connect to the systems digital ground. 11 vcc +5 or +3 volt power source for the XE056LCC. vcc powers the ri and oh control lines. 12 /oh active low switch-hook control. a low on /oh closes the switch-hook causing the daa to seize the local telephone line. raising /oh drops the telephone line connection. /oh can be pulsed to simulate rotary dialing. when rotary dialing, a series of pulses represents each digit. (one pulse for the digit one to ten pulses for the digit zero.) these pulses are created by a momentary closure of the hook-switch. the pulse rate in the us is 10 pulses per second. the pulses must be asymmetrical with the hook-switch closed for 31 milliseconds then open for 69 milliseconds. a delay of at least 100 milliseconds is required between digits. 13 n/c no connection 14 t2 t2 and t1 provide the differential analog signal input/output connecting directly to the secondary side of the XE056LCC line transformer. to match the impedance of the daa to the 600 ohm telephone line, a 340 ohm resistor is required on t1 or t2. 15 t1 t1 and t2 provide the differential analog signal input/output connecting directly to the secondary side of the XE056LCC line transformer. to match the impedance of the daa to the 600 ohm telephone line, a 280 ohm resistor is required on t1 or t2. 16-17 n/c no connection 18 ri active high ring indicate output. ri provides a square wave representation of the ring signal present on tip and ring. this permits intelligent monitoring of the incoming ring. 18 17 16 15 14 13 12 11 10 ri n/c n/c t1 t2 n/c /oh vcc gnd n/c ring tip n/c n/c n/c n/c n/c n/c XE056LCC (top) 1 2 3 4 5 6 7 8 9 XE056LCC pin configuration
xecom (5) XE056LCC typical connections diagram recommended parts c1, c2 470 pfd, 1500 volts; c1 and c2 may be required for emi filtering to prevent unintended radiation when the telephone cable is attached to your system. these capacitors must be rated at a minimum of 1500 volts to maintain the isolation required by fcc part 68 rules. fb1., fb2 fb1 and fb2 are ferrite beads provided for emi filtering. xecom recommends the tdk acb2012l-120 which provides more than 100 ohms impedance above 100 mhz. rj11 tdk 73m1903 analog front-end xecom XE056LCC ring 2 ti p 4 18 ri 15 t1 14 t2 12 /oh 11 vcc 10 gn d gpio0 gpio1 txap txan rxa p rxa n 3.3 v c1 c2 fb1 fb2 0.15 fd 140 ? 140 ? 42k ? 42k ? 0.15 fd 58k ? 58k ?
xecom (6) XE056LCC slim-link ? plcc soldering instructions because of its hybrid construction, the XE056LCC daa is subject to damage if over exposed to heat during solder reflow operations. following the soldering instructions below will ensure that the process of soldering the module to the board does not damage the daa. maximum temperature 220 o c maximum time at 220 o c 20 seconds maximum time above eutectic (180 o c) 90 seconds maximum preheat dwell time 180 seconds maximum recommended solder temperature profile 220 o c 180 o c 150 o c -20 sec- ------------------------------180 sec max------------------------- max ----- 90 sec max ----- notes: do not expose the XE056LCC daa module to direct infrared (ir) heating. if your process includes direct ir heating, you must shield the daa module from the infrared radiation. xecom?s XE056LCC daa modules should be exposed to no more than one reflow cycle.
xecom (7) XE056LCC XE056LCC applications notes dialing: the XE056LCC supports both tone and rotary (pulse) dialing. tone dialing requires an external signal source to generate the dialing tones. rotary dialing is accomplished by pulsing the /oh line. pulse dialing: dialing pulses are created by momentarily closing the switch-hook. each digit is represented as a series of pulses; one pulse for the digit one, two pulses for a two, up to ten pulses for a zero. the pulse rate is ten pulses per second. these dialing pulses are asymmetrical. for the correct duty cycle consult with the local country regulations. an inter-digit delay of at least one hundred milliseconds separates the digits. tone dialing: to permit tone dialing the /oh line msut be activated to seize the line. dialing tones can then be presented on t1 and t2. each digit consists of a unique dtmf, dual tone multiple frequency, tone pair. transmit teh tones for a minimum of 70 milliseconds with a minimum of 70 milliseconds between digits. below is a list of the dtmf signal frequencies. digit lower t one upper t one 1 697 1209 2 697 1336 3 697 1477 4 770 1209 5 770 1336 6 770 1477 7 852 1209 8 852 1336 9 852 1477 0 941 1336 * 941 1209 # 941 1477 signal levels: fcc part 68 rules set the maximum level of all signals on the telephone line other than live voice. signal levels are measured in dbm; 0 dbm is 1 milliwatt through a 600 ohm load. dialing tones may have a combined signal level of up to 0 dbm; all other signals are limited to a maximum of -9 dbm. insertion loss: there is some loss of signal strength as the signal passes through the daa. this "insertion" loss should be considered when placing signals across t1 and t2 for transmission. the typical insertion loss of the XE056LCC is 6 db. total harmonic distortion: total harmonic distortion measures the quality of the daa signal path quality. the primary sources of distortion are the telephone line transformer and the line current holding circuit, although board layout and other factors can introduce distortion. total harmonic distortion varies with frequency. the telephone line provides a frequency band of 100 to 4000 hz. high speed modems using v.90 and v.92 protocols require virtually all of this bandwidth. even if the total harmonic distortion is very good in the center of the spectrum, distortion elsewhere will adversely affect data transmission.
xecom (8) XE056LCC 2/4 wire conversion: two-way communications over a two-wire telephone line requires that the transmit and receive signal share the available bandwidth. the 2/4 wire convertor separates these signals at the host interface. most modem analog front end chips incorporate an internal 2/4 wire convertor. if you are using the XE056LCC for an application other than a modem, such as audio, or your modem analog front end does not provide the 2/4 wire convertor, you will need to provide a discrete 2/4 wire convertor. figure 12 shows a simple 2/4 wire convertor circuit. XE056LCC applications notes the performance of the 2/4 wire convertor is measured by its transhybrid loss. the transhybrid loss shows how much the 2/4 wire convertor attenuates the transmit signal on the received data path. the circuit above provides a typical transhybrid loss of 20 db. the value of r3 can be changed to improve the transhybrid loss. the transhybrid loss will vary with the quality of the impedance match to the telephone line. the impedance presented to the telephone line isa a funciton of the impedance matching resistor, rt. variations from line to line mean that a perfect impedance match is rarely achieved. the 2/4 wire convertor also amplifies the transmit and receive signals to compensate for the insertion loss of the daa. this circuit provides 6 db gain of both the transmit and receive signals. the values of r1 and r2 set the transmit gain. the values of r4 and r5 set the receive gain. + r2=22 k r1=10 k rt t1 daa t2 r4=40 k r3=20k r5=11k r6=10k tl082c 5 6 7 1 2 3 _
xecom (9) XE056LCC electrical specifications (vcc=+5v 10%, ta=0 to 70 deg c) power supply current off-hook 10 ma on-hook 0.5 ma transmit insertion loss 600 ohm impedance, 1800 hz 4.5 6.0 7.0 db receive insertion loss 600 ohm impedance, 1800 hz 4.5 6.0 7.0 db matching impedance input to t1 and t2 266 280 294 ohms line impedance rt equals 340 ohms 540 600 660 ohms total harmonic distortion 600 ohm impedance, -72 -77 db 200 to 4000 hz ring detect sensitivity tip & ring voltage; 38 150 vrms type b ringer ring frequencies range 16 68 hz ri output voltage no ring signal, low output 0.2 0.5 volts (active high) ring signal present, high output 2.0 5.0 volts hook-switch control on: (off-hook) 0.2 0.5 volts voltage (active low) off: (on-hook) 2.0 3.0 volts hook-switch control on: (of f-hook) 5 10 milliamps current off: (on-hook) 5 uamps loop current off-hook 20 100 ma dc on-hook impedance hook-switch open 10 mohms parameter conditions min typ max units XE056LCC absolute maximum ratings storage temperature -25 o c to +85 o c operating temperature range * 0 o c to +70 o c * the XE056LCC can be ordered with an operating temperature of -40 o c to +85 o c at extra cost. order model number XE056LCC-itr
xecom (10) XE056LCC XE056LCC fcc part 68 information when developing a product to be connected to the telephone line, it is necessary to use a circuit known as a data access arrangement (daa) approved by the appropriate governmental agency. in the us this agency is the federal communications commission (fcc), while in canada it is industry canada (ic). these agencies test and approve the product to ensure that it meets their specifications, thereby protecting the telephone system from damage and protecting the user from high voltage transients (such as lightning strikes) which may come down the telephone line. the XE056LCC has been designed to meet all fcc part 68 requirements for hazardous voltage, line impedance and leakage current. if the system transmits data, synthesized voice, or dtmf tones on the telephone line, the user must certify that the signals transmitted meet basic fcc requirements for maximum transmission levels, out of band energy and billing delay. full details may be obtained from the fcc under part 68 of the fcc rules and regulations, or in title 47 of the code of federal regulations, however the basic requirements are as follows: 1. maximum transmit level for the normal ?permissive? (standard) telephone line, equipment which transmits data (such as a modem) must not exceed a transmission level of -9 dbm. 2. out of band energy data equipment must not transmit ?out of band? energy on the telephone line which exceeds the following limits: frequency range max. power 3995 hz to 4005 hz -27 dbm 4005 hz to 12 khz -20 dbm 12 khz to 90 khz -55 dbm 90 khz to 270 khz -55 dbm 270 khz to 6 mhz -15 dbm 3. dtmf transmission level if the system is capable of dtmf dialing, the maximum dtmf transmission level must be less than 0 dbm averaged over a 3 second interval. 4. billing delay a delay of 2 seconds or greater is required after the time the XE056LCC is taken ?off hook? and before any information is transmitted. this is required to ensure that billing information may be exchanged between telephone company central offices without interference. the user of the XE056LCC must certify to the fcc that the final system meets the requirements of part 68 which include the criteria above as well as the high voltage protection provided by the XE056LCC. this is generally accomplished through an independent testing lab which tests the system and submits the proper paperwork to the fcc for approval. since the XE056LCC already complies with fcc part 68 rules, this is a relatively simple process.
xecom (11) XE056LCC copyright, xecom ? 2005 while xecom, inc. has made every effort to ensure that the information presented here is accurate, xecom will not be liable for any damages arising from errors or omission of fact. xecom reserves the right to modify specifica- tions and/or prices without notice. product mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies. xecom incorporated 374 turquoise street, milpitas, ca 95035 ph:408-942-2200 fax:408-942-1346 email: info@xecom.com web site: http://www.xecom.com terms of sale devices sold by xecom are covered by the warranty provisions appearing in its terms of sale only. xecom makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or re- garding the freedom of the described devices from patent infringement. xecom makes no warranty of merchant- ability or fitness for any purposes. xecom reserves the right to discontinue production and change specifications and prices at any time and without notice. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliability appli- cations, such as military, medical life-support or life-sustaining equipment, are specifically not recommended with- out additional processing and authorization by xecom for such application. xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a xecom product. no other circuits, patents, or licenses are implied. life support policy xecom's products are not authorized for use as critical components in life support devices or systems. 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 perform, when properly used in accordance with instruc- tions provided in the labeling, can be reasonably expected to result in significant injury to the user. a critical component is any component of a life support device or system whose failure to perform can be rea- sonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.

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