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data sheet conexant - proprietary doc. no. 100777c data subject to change october 11, 2000 RF137 transceiver for gsm applications the RF137 transceiver is a highly integrated device optimized for use in single- band or multi-band global system for mobile communications (gsm) applications. in the receive path, the device consists of selectable gain intermediate frequency (if) amplifiers and an image reject downconverter with differential if outputs. in the transmit path, the device consists of an in-phase and quadrature (i/q) modulator and a frequency translational loop designed to perform frequency up- conversion with high output spectral purity. this loop has a phase/frequency detector, a charge-pump, a mixer, and buffers for the required isolation between rf output, local oscillator (lo), and if inputs. in addition, the RF137 features an on-chip, dual-loop uhf/vhf frequency synthesizer circuit. it includes two sets of reference dividers, phase/frequency detectors, charge pumps, prescalers, main dividers, and control circuits. the device package and pinout of the RF137 are shown in figure 1. a block diagram is shown in figure 2. the signal pin assignments and functional pin descriptions are found in table 1. the absolute maximum ratings of the device are provided in table 2, and the operating conditions and electrical specifications are provided in table 3. features ? image-reject mixer for downconversion to 2nd if ? 24 db selectable attenuation on 1st if amplifier ? 12 db selectable attenuation on 2nd if amplifier ? integrated transmit path with high phase accuracy ? reduced filtering requirements for the transmit path ? wide rf and if range for multi-band operation ? integrated, fully programmable dual loop synthesizer ? integrated local oscillator phase shifters ? on-chip second local oscillator ? low supply voltage down to 2.7 v ? separate enable lines for transmit, receive, and synthesizer modes for power management ? 48-pin thin quad flat pack (tqfp) (7mm x 7mm) package applications ? gsm900/dcs1800/pcs1900 digital cellular telephony 100777c-1_100500 gnd vcc tlcpo vccb gnd gnd txifin+ txifin- txi+ txq- txi- txq+ 1 2 3 4 5 6 7 8 9 10 11 12 txmo+ clk txmo- le data gnd vccb ucpo fref vccb gnd vcpo 14 15 16 17 18 19 20 21 22 23 13 24 txena vcc txrfin+ txrfin- gnd if1in+ loin+ loin- if1in- sxena rxena rxmxo 47 46 45 44 43 42 41 40 39 38 48 37 res1 vcc res2 if2in+ if2in- if2o+ bpc gnd vcc gnd ld if2o- 36 35 34 33 32 31 30 29 28 27 26 25 figure 1. RF137 pinout ? 48-pin tqfp
RF137 transceiver 2 conexant - proprietary 100777c october 11, 2000 data subject to change c018 bias rx sx rx sx bpc tlcpo gsel1 pfd 90? vhf synthesizer uhf synthesizer 3-wire control tx tx tx lo2 90? ceramic filter txq+ txq- txi+ txi- txmo+ txmo- chp if1in+ if1in- res1 res2 lo1in+ lo1in- txrfin+ txrfin- txifin+ txifin- rxmxo gsel2 rx lo2 sx lo2 ? ? rxena txena sxena vcpo fref ucpo clk data le ld if2o+ if2o- if2in+ if2in- ? ? ? ? ? ? ? ? + figure 2. RF137 block diagram technical description the RF137 transceiver consists of three main sections: ? receive (rx) section ? transmit (tx) section ? synthesizer (sx) section the rx, tx, and sx sections can be powered up or down independently by setting rxena, txena, and sxena high or low. the signal pin assignments and functional pin descriptions are found in table 1. table 2 provides the absolute maximum ratings of the RF137. the general electrical characteristics are provided in table 3. receive section . the receive section consists of the following functional blocks: ? a first if amplifier (selectable gain step of 24 db). ? an image reject mixer that downconverts from a first if to a second if. ? a buffer amplifier that precedes a second if ceramic filter. ? a second if amplifier (selectable gain step of 12 db) with differential outputs. the first if amplifier is a programmable gain amplifier (pga) with selectable gains of +18 or ?6 db. the amplifier gain is controlled by a three-wire bus. the first if amplifier is at a high gain state when bit s7 = 1 (rx gain sel1) and co = 1 or at a low gain state when bit s7 = 0 (rx gain sel1) and co = 1. the image reject mixer relaxes the first if filtering requirements at the image frequency of the second mixer. image rejection is achieved for a high side/low side injection when bit s9 is set to the appropriate logic level and co = 1. table 4 defines the three-wire bus control and output states.
transceiver RF137 100777c conexant - proprietary 3 data subject to change october 11, 2000 table 1. RF137 signal description pin # name description pin # name description 1 gnd ground 25 ld lock detect output 2 tlcpo translational loop charge pump output 26 if2o? 2nd if output 3 vccb supply for synthesizers 27 if2o+ 2nd if output 4 vcc supply for transceiver 28 if2in? 2nd if input reference 5 gnd ground 29 if2in+ 2nd if input 6 txifin+ txif translation loop input 30 gnd ground 7 txifin? txif translation loop input 31 vcc supply for transceiver 8 gnd ground 32 res2 resonator pin for vhf oscillator 9 txi+ tx modulator input 33 res1 resonator pin for vhf oscillator 10 txi? tx modulator input 34 vcc supply for transceiver 11 txq+ tx modulator input 35 gnd ground 12 txq? tx modulator input 36 bpc bypass capacitor 13 txmo+ positive polarity tx modulator output 37 sxena synthesizer enable 14 txmo? negative polarity tx modulator output 38 rxmxo rx mixer output 15 le latch enable input 39 rxena receiver enable 16 clk clock input 40 if1in? 1st if input 17 data data input 41 if1in+ 1st if input 18 vccb supply for synthesizers 42 loin? uhf local oscillator input reference 19 ucpo uhf loop charge pump output 43 loin+ uhf local oscillator input 20 gnd ground 44 gnd ground 21 fref reference input 45 vcc supply for transceiver 22 gnd ground 46 txrfin? transmit input reference 23 vcpo vhf loop charge pump output 47 txrfin+ transmit input 24 vccb supply for synthesizers 48 txena transmit enable table 2. absolute maximum ratings parameter minimum maximum units ambient operating temperature ?30 +85 c storage temperature ?40 +125 c power dissipation +600 mw supply voltage (v cc )+4.0v input voltage range gnd vcc v supply voltage (v ccb )4.0v
RF137 transceiver 4 conexant - proprietary 100777c october 11, 2000 data subject to change table 3. RF137 electrical specifications (1 of 4) (ta = 25 c, vcc = 3.0 v, except where specified) parameter symbol test condition min typical max units if amplifier/mixer input impedance zin differential 1000// 0.5 ? //pf input operating frequency fn 70 450 mhz voltage gain: high gain mode low gain mode av s7 = 1, co = 1 s7 = 0, co = 1 +16.5 ?7 +18 ?6 +19 ?5 db db gain step variation dav 0.5 db single-sideband noise figure nf high gain mode 7 8 db input 1 db compression point high gain mode low gain mode p1db ?35 ?9 ?32 ?7 dbv dbv mixer spurious level pin = ?51 dbv ?50 dbc image rejection 35 45 db output impedance zout 330// 2.2 ? //pf output operating frequency fout 14.6 mhz 2nd if amplifier input impedance zin 330// 2.2 ? //pf operating frequency fif 14.6 mhz voltage gain: high gain mode low gain mode av s8 = 1, co = 1 s8 = 0, co = 1 17 5 18 6 19 7 db db gain step variation versus frequency dav 0.5 db noise figure nf 7 db input p1db p1db low gain mode ?25 ?22 dbv output impedance zout differential 1000// 1.2 ? //pf receiver gain temperature coefficient without ceramic filter 0.03 0.04 db/ c power supply rejection ratio 0.5 db/v input common mode rejection ratio fin = 400 mhz 65 db i/q modulator input impedance zin differential @ 100 khz 750// 3.3 k ? //pf input common mode voltage range vcm 0.85 1.35 vcc? 1.35 v input offset voltage vos 1 5 mv input common mode rejection ratio fin = 100 khz fin = 1 mhz 75 55 db output operating frequency fout 70 425 mhz output impedance zout differential @400mhz 600// 3.1 ? //pf
transceiver RF137 100777c conexant - proprietary 5 data subject to change october 11, 2000 table 3. RF137 electrical specifications (2 of 4) (ta = 25 c, vcc = 3.0 v, except where specified) parameter symbol test condition min typical max units i/q modulator (continued) differential output voltage ?20 ?15 dbv output noise power no 10 mhz offset ?130 ?126 dbc/hz lo feedthrough ?43 ?40 dbc sideband suppression 45 db spurious (note 1) @200 khz offset @300 khz offset ?60 ?60 ?40 ?45 dbc dbc translational loop transmit frequency (input from vco) ftx 800 2000 mhz lo input frequency flo 800 2000 mhz if frequency: with divide-by-2 with divide-by-1 fif s4 = 1, co = 1 s4 = 0, co = 1 70 70 425 300 mhz transmit input power pin with external 50 ? termination ?13 ?10 ?7 dbm transmit input impedance zin differential 300// 0.3 ? pf lo input power pin with external 50 ? termination ?13 ?10 ?7 dbm lo input impedance zin differential 300// 0.3 ? pf tx output noise no @ 20 mhz offset (note 2) ?165 ?162 dbc/hz charge pump output current source/sink source/sink high impedance output iout s10 = 0, co = 1 s10 = 1, co = 1 1.0 0.5 0.02 ma ma ma tx output spurs (note 3): 2x spurs 3x spurs 4x spurs 5x spurs ?65 ?70 ?70 RF137 transceiver 6 conexant - proprietary 100777c october 11, 2000 data subject to change table 3. RF137 electrical specifications (3 of 4) (t a = 25 c, vcc = 3.0 v, except where specified) parameter symbol test condition min typical max units synthesizer input frequency (low freq. mode), vhf pll finl(if) 150 260 mhz input frequency (high freq. mode), vhf pll finh(if) 250 450 mhz input frequency (low freq. mode), uhf pll finl(rf) 500 1200 mhz input frequency (high freq. mode), uhf pll finh(rf) 500 2000 mhz reference frequency fref 1 40 mhz reference input sensitivity rin 500 mvpp phase detector frequency fpd 10 10000 khz phase detector output impedance zo 10 m ? prescaler input sensitivity pin 100 mvpp prescaler input impedance zin @ 1 ghz 100 ? pll contribution to phase jitter (n=11670) nmain uhf only; fcomparison = 100 khz, 10 khz loop bw; integrated from 200 to 270,000 hz 1.5 degrees rms main divider phase jitter div 0.5 ps pll contribution to phase jitter (n=1680) naux vhf only; fcomparison = 300 khz, 10 khz loop bw; integrated from 200 to 270,000 hz 0.75 degrees rms uhf charge pump current, step 0 i dor,0 t=25 c 0.6 0.8 1.0 ma uhf charge pump current, step 1 i dor,1 t=25 c 0.9 1.2 1.5 ma uhf charge pump current, step 2 i dor,2 t=25 c 1.35 1.8 2.25 ma uhf charge pump current, step 3 i dor,3 t=25 c 2.02 2.7 3.38 ma vhf charge pump current, step 0 i doi,0 t=25 c 0.4 0.5 0.67 ma vhf charge pump current, step 1 i doi,1 t=25 c 0.6 0.8 1.0 ma vhf charge pump current, step 2 i doi,2 t=25 c 0.9 1.2 1.5 ma vhf charge pump current, step 3 i doi,3 t=25 c 1.35 1.8 2.25 ma charge pump current relative step size (current change from any one step to next step in sequence) i dos 40 50 60 % charge pump leakage current idoo ?5 5 na charge pump output voltage compliance vdo 0.5 vcc?0.5 v lock detect time constant ilock 500 s lock detect phase error threshold 45 degrees three-wire control (refer to figure 4) data to clock setup time tcs 50 ns data to clock hold time tch 10 ns clock pulse width high tcwh 50 ns clock pulse width low tcwl 50 ns clock to load enable setup time tes 50 ns load enable pulse width tew 50 ns load enable transition to clock start time tls 50 ns
transceiver RF137 100777c conexant - proprietary 7 data subject to change october 11, 2000 table 3. RF137 electrical specifications (4 of 4) (t a = 25 c, vcc = 3.0 v, except where specified) parameter symbol test condition min typical max units transceiver enable and control vih vih vcc?0.4 v enable and control vil vil 0.4 v enable and control iih iih 20 60 a enable and control iil iil ?10 ?1 0 a total supply current: rx mode tx mode synthesizer mode sleep mode @vcc = 3.0v i cc rxena = sxena = high txena = sxena = high sxena = high rxena = sxena = txena = low 48 60 27 0.04 0.2 ma ma ma ma power supply range v cc (note 5) v ccb 2.7 2.7 3.75 3.75 3.94 3.94 v v operating temperature range t a ?30 +25 +85 c note 1 : for 1vp-p, 100 khz differential signals across iin and qin. note 2 : for 1 mhz loop bandwidth and external vco with phase noise of ?165 dbc/hz @ 20 mhz offset from a carrier frequency of 900 mhz . note 3 : ?nx spurs? denotes the order of the flo harmonic that can mix with a harmonic of fif and result in a product at zero frequenc y. note 4 : using varactors with similar characteristics as loral part kv1925. note 5 : v cc must not be less than v ccb ? 0.4 v if separate supply voltages are used for v cc and v ccb . the buffer amplifier following the image reject mixer has an output impedance of 330 ? for direct connection to the external ceramic filter. the second if amplifier converts the single-ended output from the ceramic filter to a differential signal which may be input to a bandpass sigma-delta a/d converter. the input impedance of the amplifier is a nominal 330 ? , which matches the external ceramic filter. the nominal gain of the amplifier is 18 db, but is reduced to 6 db when bit s8 = 0 (rx gain sel2) and co = 1. transmit section . the transmit section consists of the following functional blocks: ? a baseband to if quadrature modulator with an output amplifier. ? a translation loop circuit consisting of a phase and frequency detector, a charge pump, a txrf input buffer, an lo input buffer, a mixer, and a low pass filter. the i/q-to-if modulator takes in differential i and q baseband signals. the baseband signals are initially low pass filtered and then input to a pair of double balanced mixers. pins 13 and 14 (txmo+ and txmo?, respectively), the modulator output, and pins 6 and 7 (txif+ and txif?, respectively), the if input, allow for any additional filtering required before the signals enter the translation loop. the translation loop circuit of the RF137, together with a vco and an external loop filter, forms a phase-locked loop (pll). the inherent bandpass filtering that occurs in the pll eliminates the need for a duplexer or a surface acoustic wave (saw) filter that is usually required to suppress transmission noise. the overall efficiency is increased as a result of the elimination of high loss, post-pa bandpass filters. this results in increased handset talk time. the vco output of the translation loop is at the transmit rf frequency. a portion of the vco output must be fed back to pin 47 (txrfin+) of the device and mixed with a buffered lo signal to create an if signal. the if output from the mixer is input to the phase and frequency detector where the if output from the mixer is compared with the modulated if input to the device. when co = 1, the s6 bit on the three-wire bus allows for a high side/low side injection setting. synthesizer section (sx) . the synthesizer section consists of the following functional blocks: ? frequency synthesizers ? on-chip oscillator with external resonant circuit ? three-wire bus control circuit
RF137 transceiver 8 conexant - proprietary 100777c october 11, 2000 data subject to change table 4. RF137 control bits and output states block c0 bit function description lo 1 s1 rx lo 2/ 4 selects the division ratio for rx lo2 (0 = division ratio is 2; 1 = division ratio is 4) s2 sx lo2 2/ 4 selects the division ratio for sx lo2 (0 = division ratio is 2; 1 = division ratio is 4) s3 tx lo 2/ 4 selects the division ratio for tx lo2 (0 = division ratio is 2; 1 = division ratio is 4) tx 1 s4 tx if 1/ 2 selects the division ratio for tx if (0 = division ratio is 1; 1 = division ratio is 2) s5 tx mix out 1/ 2 selects the division ratio for tx mix output signal (0 = division ratio is 1; 1 = division ratio is 2) s6 tx lo injection selects between high-side and low-side injection of first lo input with respect to transmit rf (0 = low side; 1 = high side) receive 1 s7 rx gain select 1 selects rx 1st if amplifier gain (0 = low gain; 1 = high gain) s8 rx gain select 2 selects rx 2nd if amplifier gain (0 = low gain; 1 = high gain) s9 rx lo injection selects lo injection (0 = low side injection; 1 = high side injection) trx 1 s10 tx tl cp current charge pump current in translation loop circuit (0 = low current, 1 = high current) s11 reserved s11 bit may be programmed as ?don?t care.? s12 vhf lo buf selects the state of lo buffer. needs to be ?1? for correct operation (0 = lo buffer off; 1 = lo buffer on) sx 0 s1 if/rf selects one of the synthesizers, either the vhf or uhf (0 = vhf is selected; 1 = uhf is selected s2 r/n selects the r count or n count register within the synthesizer. the n count register also controls the phase detector current and inversion (or phase comparison reference signal) (0 = n counter register selected; 1 = r counter register selected) s3 s2=0: prescaler frequency response determines the maximum input frequency at which the prescaler will operate. s1=1 (uhf): 0 = 1.2 ghz, 1 = 2.0 ghz; s1=0 (vhf): 0 = 260 mhz, 1 = 450 mhz s2=1: output invert controls polarity of charge pump output (0 = normal operation; 1 = inverted) s4 s2=0: synthesizer power down powers down the synthesizers. only the synthesizer indicated by s1 is affected (0 = normal operation; 1 = power down) s2=1: lock detect/test mode select used to select the test mode or lock detect output on pin 25 (0 = selects the test mode output, where s8 and s9 select the signal multiplexed to pin 25; 1 = selects the translational loop lock detect signal for output to pin 25). s5- s22 s2=0: n counter this 18-bit value is loaded into the n counter latch. this value sets the cascaded division ratio of the prescaler and n counter (s22=msb, s5=lsb). for the vhf n divider (16-bit), bits s21 and s22 are ?don?t care?. the least significant bits (s5-s9 for uhf n divider; s5-s7 for vhf n divider) set the prescaler counter. s5- s6 s2=1: output current these bits set the charge pump output current. s1=1 uhf: 00=0.8, 01=1.2, 10=1.8, 11=2.7 [ma] s1=0 vhf: 00=0.5, 01=0.8, 10=1.2, 11=1.8 [ma] s7 s2=1: cp output impedance the charge pump output is changed to a high impedance output. only the charge pump output selected by s1 bit is affected (0 = normal operation; 1 = output impedance) s8- s9 s2=1, s4 = 0: test mode these bits select which signal is output at pin 25 (ld) when the test mode output is selected (s2 = 1, s4 = 0). 00 = (lock detect of vhf) and (lock detect of uhf) 01 = output of r divider 10 = output of n divider 11 = output of lock detect vhf (s1=0) or uhf (s1=1) s10- s22 s2=1: r counter these 13 bits set the reference divider value (s22=msb, s10=lsb).
transceiver RF137 100777c conexant - proprietary 9 data subject to change october 11, 2000 there are two frequency synthesizers on the chip, one uhf and one vhf. the uhf synthesizer can provide frequencies from 500 mhz to 2 ghz. it consists of a 32/33 modulus prescaler, a 13-bit r counter, an 18-bit n counter, a phase detector with lock detection, and a charge pump. the vhf synthesizer, with a frequency range from 150 mhz to 450 mhz, consists of an 8/9 modulus prescaler, a 13-bit r counter, a 16-bit n counter, a phase detector with lock detection, and a charge pump. each synthesizer has four charge pump current settings for optimal performance. the on-chip oscillator together with a few external components as resonant elements, form a vhf vco (figure 3 shows the vco configuration). the differential vco output is buffered and then fed to three dividers (rx, tx, sx) with a selectable divide ratio of either 2 or 4. the rx and tx dividers are both quadrature dividers, which generates in-phase and quadrature phase los. the on-chip oscillator with the on-chip vhf synthesizer, provides complete vhf frequency synthesis for the rx vhf lo and tx vhf lo. the three-wire bus control allows the RF137 to be optimized for any desired frequency plan. it also programs the two on-chip frequency synthesizers. to ensure that the data remains latched, one of the signals txena, rxena, or sxena must stay enabled. when bit c0 is set to 1, it allows for divider selections in the translation loop, high-side/low-side injection for the image reject mixer and the receive if amplifiers? gain setting. when bit c0 is set to 0, it programs the uhf/vhf synthesizer, the r/n counter, charge pump polarity, charge pump output current, and prescaler setting. the three-wire bus timing diagram is provided in figure 4. figure 5 illustrates a typical RF137 application circuit. figure 6 provides the package dimensions for the 48-pin tqfp RF137 transceiver and figure 7 provides the tape and reel dimensions. esd sensitivity because the RF137 is a static-sensitive electronic device, proper esd precautions must be taken when using the RF137. do not operate or store the RF137 near strong electrostatic fields. vcc external resonator RF137 res1 (pin 33) res2 (pin 32) vtune c588 figure 3. RF137 internal vco
RF137 transceiver 10 conexant - proprietary 100777c october 11, 2000 data subject to change c589 data clock le s12/s22 s11/s21 s1 c0 t cs t cwh t ls t cwl t ch t ew t es figure 4. RF137 wire bus timing diagram
transceiver RF137 100777c conexant - proprietary 11 data subject to change october 11, 2000 le clk data txi+ 2nd if filter txi- txq+ txq- rxena txena rxena if2o+ if2o- 33 pf out2 out1 in2 in1 if saw filter rxifin+ rxifin- 0.01 f 23 16 10 33 32 31 20 21 34 3 37 29 12 39 15 44 35 8 1 22 5 30 7 6 14 13 40 41 36 43 4 24 45 27 26 47 28 rxmxo if2in- if2in+ if2o- if2o+ txi+ txi- txq+ txq- rxena txena sxena gnd gnd gnd gnd gnd gnd gnd le clk data ld vccb vcc res1 res2 vcc fref gnd vcpo if1in- if1in+ bpc vccb vcc txmo+ txmo- txifin+ txifin- vcc loin loinr txrfin+ txrfin- tlcpo 38 11 9 42 48 46 17 25 2 txif filter RF137 51 w 15 pf tl vco control 1 nf lock detect 100 pf 1 k w 0.01 f 0.01 f 0.01 f 270 pf 33 pf 5.6 nh 3 k w 3 k w smv1234-004 vhf tune 10 w vccb 18 1 nf 1 nf 10 w 10 w 10 w 10 w 1 nf vrf 0.01 f 10 w 1.5 pf 10 nh ucpo 19 vrf tl vco 14.6 mhz 2nd rxif 1st rx if to pa 1mhz loop bandwidth vhf vco 14.6 mhz rx if output for if sampling at a/d ref freq vsyn 2.2 k w 820 pf 820 pf 33 nf 2.2 k w 1000 pf 1.5 pf 10 nh 27 nh 18 pf 50 w 680 pf 18 nf 680 pf 2.2 k w 2.2 k w uhf vco c595 5.6 nh 1.2 h figure 5. RF137 typical application schematic
RF137 transceiver 12 conexant - proprietary 100777c october 11, 2000 data subject to change detail a a1 l1 c l a a2 millimeters 0.05 8.85 0.5 0.11 1.6 max 0.15 9.15 5.5 ref 0.75 1.0 ref 0.500 ref 0.17 0.10 max 0.0020 0.3484 0.0197 0.0043 a a1 a2 d d1 d2 l l1 e b c coplanarity min. max. min. max. inches* dim. ref: 48-pin tqfp (gp00-d283) 0.0630 max 0.006 0.3602 0.2165 ref 0.0295 0.0394 ref 0.0197 ref 0.0067 0.0039 max metric values (millimeters) should be used for pcb layout. english values (inches) are converted from metric values and may contain round-off errors. * d1 detail a pin #1 indicator e b c004 d2 d1 d d2 d1 d 1.35 1.45 0.0528 0.0571 0.2736 0.2776 6.95 7.05 0.220 ref 0.0087 ref figure 6. RF137 package dimensions ? 48-pin tqfp
transceiver RF137 100777c conexant - proprietary 13 data subject to change october 11, 2000 c880 notes: 1. carrier tape material: black conductive polycarbonate 2. cover tape material: transparent conductive psa 3. cover tape size: 13.3mm width 4. tolerance: .xx = 0.10 5. quantity: 1000 per reel 6. all measurements are in millimeters 12.00 0.10 pin #1 indicator 4.00 0.10 1.50 0.10 2.00 0.10 1.75 0.10 16.00+0.30/-0.10 1.50 0.25 7.26 1.73 0.318 0.013 2.46 0.10 9.55 0.10 7.09 8 o max 5 o max 9.45 0.10 7.50 0.10 figure 7. RF137 tape and reel dimensions
RF137 transceiver 14 conexant - proprietary 100777c october 11, 2000 data subject to change ordering information model name manufacturing part number product revision gsm transceiver RF137 ? 2000, conexant systems, inc. all rights reserved. information in this document is provided in connection with conexant systems, inc. ("conexant") products. these materials are p rovided by conexant as a service to its customers and may be used for informational purposes only. conexant assumes no responsibility for errors or omissions in these materials. conexant may make changes to specifications and product descriptions at any time, without notice. conexant makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. exce pt as provided in conexant?s terms and conditions of sale for such products, conexant assumes no liability whatsoever. these materials are provided "as is" without warranty of any kind, either express or implied, relating to sale and/or use of conexant products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. conexant further does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. conexant shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of these materials. conexant products are not intended for use in medical, lifesaving or life sustaining applications. conexant customers using or selling conexant products for use in such applications do so at their own risk and agree to fully indemnify conexant for any damages resulting from such improper use or sale. the following are trademarks of conexant systems, inc.: conexant?, the conexant c symbol, and ?what?s next in communications te chnologies??. product names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. third-party b rands and names are the property of their respective owners. additional information, posted at www.conexant.com, is incorporated by reference. reader response : conexant strives to produce quality documentation and welcomes your feedback. please send comments and suggestions to tech.pubs@conexant.com. for technical questions, contact your local conexant sales office or field applications engineer.
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