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? this document contains the information of a flex paging receiver reference prototype. this flex paging receiver board is a high performance rf/if frontend for using in flex pager. this board employs motorola's high frequency transistors mmbr941 as well as its mary fsk fm if receiver mc2800 as the core. the whole board includes a lna, an oscillator, a mixer and a fsk if receiver. features: ? input rf frequency: 284.14 mhz ? excellent sensitivity: 124 dbm ? operating voltage: v cc = 1.1 to 1.7 v ? total current consumption: 3.2 ma @ v cc = 1.1 v ? switchable bitrate filter to support all kinds of flex data rate ? separate interfacing supply voltage ordering information device description MC2800EVK flex paging receiver board evaluation kit flex is a trademark of motorola, inc. figure 1. system block diagram if fsk receiver 2bit output to flex decoder 4bit control lines rf input local oscillator crystal filter saw filter mixer lna mc2800 2 4 455 khz ceramic filter ? motorola, inc. 1999 rev 0 this document contains information on a new product. specifications and information herein are subject to change without notice. archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 2 motorola rf/if device data figure 2. 25 26 27 28 29 30 31 32 16 15 14 13 12 11 10 9 12 345 678 24 23 22 21 20 19 18 17 gnd 15 612 mc2800 tp1 tp2 tp3 v dde v reg v cc v cc figure 2. rf/if receiver board schematic c30 100 nf c37 2.0 pf c36 100 nf l10 6.8 h m c56 not used filter2 crystal filter 21.4 mhz filter3 cfwc455d c38 3.0 pf c26 12 pf c49 100 nf c61 100 pf c50 10 f m c42 4.7 f m c41 0.1 f m c39 1.0 nf l8 4.7 f m r11 7.1 w c51 100 nf c40 4.7 f m c43 2.2 nf c45 3.3 nf c44 22 nf r19 100 k w k c57 100 nf c54 100 pf c58 56 pf c52 47 pf x2 c53 100 nf c55 4.7 f m r12 10 m w c46 100 nf c48 100 nf r17 100 k w r18 100 k w r13 10 m w c47 100 nf r14 100 k w r15 100 k w r16 100 k w q3 c25 0.5 pf l7 39 nh r9 3.0 k w c27 1.0 nf c23 22 pf filter1 safc284e75n c18 not used c10 2.0 pf r10 820 w c3 7.0 pf l2 33 nh c9 100 nf c8 100 pf c5 10 nf c6 10 nf q2 q1 d1 r2 820 w r3 2.4 k w r4 200 w r1 6.8 k w c1 2.0 pf l1 27 nh c11 10 nf c4 1.0 nf c2 5.0 pf rf in q4 x1 c17 1.0 nf c19 4.0 pf l9 18 nh c12 7.0 pf c13 10 pf c20 12 pf c21 1.0 pf l6 22 nh c60 100 nf c32 10 nf c15 100 nf c16 100 pf c14 5.0 pf l5 39 nh r7 110 w r6 430 w r5 750 w l4 33 f m l3 2.7 f m c73 1.0 f m archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 3 motorola rf/if device data recommended operating conditions characteristic symbol min typ max unit operating voltage v cc 1.1 1.7 v rf input frequency 284.135 284.145 mhz flex decoder interface voltage v dde 3.0 3.3 v electrical characteristics (v cc = 1.1 v, v dde = 3.3 v, v reg = 0.960, f rf = 284.140 mhz, unless otherwise noted.) characteristic conditions symbol min typ max unit low noise amplifier power gain [note 1] g p 20.6 db input return loss [note 1] @ 284 140 mhz s 11 4.2 db output impedance [note 1] @ 284 . 140 mhz z out 173 +j75 w noise figure [note 1] nf 2.45 db current consumption v reg = 0.960 v i 890 m a saw filter insertion loss terminating impedance = 230 w 1.0 db first local oscillator crystal frequency f c 65.681250 mhz desired output frequency 4th harmonic f lo1 262.74194 mhz desired output power 4th harmonic p lo 23.9 dbm 3rd harmonic output power referenced to 4th harmonic h3 13.5 dbc 5th harmonic output power referenced to 4th harmonic h5 11.3 dbc startup time en transits from '0' to '1' <4.5 ms current consumption v reg = 0.960 v i 560 m a lna + saw filter + mixer conversion gain [note 2] input @ 284.140 mhz g c 32.4 db noise figure [note 2] output @ 21.400 mhz nf 2.69 db output impedance @ 21.400 mhz z out 1.13 j1.16 k w current consumption of mixer v reg = 0.960 v i 330 m a crystal filter insertion loss terminating impedance = 1.5 k w 0.9 db if receiver mc2800 input impedance @ 21.400 mhz z in 770 j550 w second local oscillator frequency f lo2 20.94506 mhz startup time of 2nd lo en transits from '0' to '1' <1.0 ms notes: 1. output of the lna is matched to 230 w by inserting a 180 w resistor in series with its output port. 2. output of the mixer is matched to 1.5050 k w by inserting a 1500 w resistor in series with its output port. 3. the circuit of this test board is the same as the schematic in figure 2. archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 4 motorola rf/if device data electrical characteristics (continued) (v cc = 1.1 v, v dde = 3.3 v, v reg = 0.960, f rf = 284.140 mhz, unless otherwise noted.) characteristic unitmax typ minsymbolconditions overall receiver performance (a) phase a characteristics [note 3] sensitivity dbm 6400/4 level fsk @ 284.140 mhz r1 = '0' and r2 = '1' 124 1600/2 level fsk @ 284.140 mhz r1 = '1' and r2 = '0' 125 cochannel rejection 6.0 db adjacent channel rejection db low side 71 high side 58 image rejection db first if 6400/4 level fsk 62 second if @ 284.140 mhz r1 '0' d r 2 '1' 65 intermodulation rejection r1 = '0' and r2 = '1' db low side 48 high side 48 blocking rejection db @ 1.0 mhz 74 @ 5.0 mhz 77 total current consumption i t power up @ v cc = 1.1 v en = '1' and cl = '0' 3.18 ma power down @ v cc = 1.1 v en = '0' and cl = '0' <30 m a (b) phase b characteristics [note 3] sensitivity dbm 6400/4 level fsk @ 284.140 mhz r1 = '0' and r2 = '1' 120 1600/2 level fsk @ 284.140 mhz r1 = '1' and r2 = '0' 125 cochannel rejection 10 db adjacent channel rejection db low side 63 high side 55 image rejection db first if 6400/4 level fsk 55 second if @ 284.140 mhz r1 '0' d r 2 '1' 57 intermodulation rejection r1 = '0' and r2 = '1' db low side 43 high side 42 blocking rejection db @ 1.0 mhz 69 @ 5.0 mhz 75 total current consumption i t power up @ v cc = 1.1 v en = '1' and cl = '0' 3.18 ma power down @ v cc = 1.1 v en = '0' and cl = '0' <30 m a notes: 1. output of the lna is matched to 230 w by inserting a 180 w resistor in series with its output port. 2. output of the mixer is matched to 1.5050 k w by inserting a 1500 w resistor in series with its output port. 3. the circuit of this test board is the same as the schematic in figure 2. archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 5 motorola rf/if device data application notes this flex paging receiver board uses motorola's npn silicon lownoise highfrequency transistors mmbr941 to construct the functional rf blocks, including a lna, an oscillator and a mixer. the mary fsk if receiver mc2800 performs the second downconversion and demodulates the received fsk signal into two digital output bits. the lna employs cascode architecture (q1 and q2) with its output being matched to 230 w , the input impedance of the 284 mhz saw filter. the input matching network should be changed when an antenna precedes the lna. special care must be taken in characterizing the lna and antenna to acheive a good interface match. the local oscillator (q4) uses a colpitts structure. its output is bandpass filtered to obtain the 4 th harmonic. the values of c12 and c13 can be altered to fine tune the lo frequency. l9 is added in this capacitor network to increase the oscillator gain. a common emitter circuit (q3) is used as the mixer with both lo and rf being accoupled to its base. its output is dccoupled to the 21.4 mhz crystal filter. to minimize the distortion of the downconverted frequency spectrum, the filter output must be matched to mix_in of the mc2800. for the characteristics of the mc2800 as well as its control (en & cl pins) and bitrate filter (r1 & r2 pins) setup, please refer to the mc2800 data sheet. it is recommended that a single ceramic filter configuration be used. that is, a 455 khz 6pole filter (filter3 in figure 2) is inserted between the mix_out and if1_in, and a 1.0 m f multilayer ceramic chip capacitor (c73 in figure 2) is connected between the if1_out and if2_in. although it is noted in the data sheet of mc2800 that 3.0 to 4.0 db performance degradation is observed in the single ceramic filter application, this performance degradation does not occur in the overall rf/if system performance. this is because the high gain and the low nf of the rf front end have effectively reduced the noise contribution of the mc2800 to the overall system. fdb interface this pager board uses an 11pin surface mount socket to interface with the pager baseband board or the flex development board (fdb). this interface provides 3 digital output pins (bdout, d1 & d2), one audio output pin, 4 control pins (en, cl, r1 & r2) and 3 supply pins (v cc , v dde & gnd). the pin descriptions are summarized in the following table and the footprint of this socket is depicted in figure 3. in order to provide a default state for these input pins, pull up resistors (r17 & r18) are used at both r1 & r2 input pins whereas a pull down resistor (r19) is connected at the cl input pin. note: for general information regarding flex products, please contact the local motorola sps sales office or the web at http://www.motsps.com pin function description pin symbol description 1 audio output symbol rate filter output. 2 r2 control bits of the mc2800 bitrate filter. default value = '1'. 3 r1 4 cl precharge and reset of the mc2800. default value = '0'. 5 v dde operating voltage of flex decoder used. 6 v cc battery supplies of mc2800. 7 en mc2800 enable pin. 8 d2 2bit digital outputs of the mc2800. 9 d1 10 bd out low battery detector output. 11 gnd ground pin. figure 3. the footprint of the 11 pin interface socket archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 6 motorola rf/if device data figure 4. the pcb layout of the receiver board (top layer) archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 7 motorola rf/if device data figure 5. the pcb layout of the receiver board (bottom layer) archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 8 motorola rf/if device data table 1. component list designator part no./value designator part no./value c1 c10 c37 2.0 pf l1 27 nh c2 c14 5.0 pf l2 33 nh c3 c12 7.0 pf l3 2.7 m h c4 c17 c27 c39 1.0 nf l4 3.3 m h c5 c6 c11 c32 10 nf l5 l7 39 nh c8 c16 c54 c61 100 pf l6 22 nh c9 c15 c30 c36 c46 c47 c48 c49 c51 c53 c57 c60 100 nf l8 4.7 m h c13 10 pf l9 18 nh c18 c56 not used l10 6.8 m h c19 4.0 pf c20 c26 12 pf r1 6.8 k w c21 1.0 pf r2 r10 820 w c23 22 pf r3 2.4 k w c25 0.5 pf r4 200 w c38 3.0 pf r5 750 w c40 c42 c55 4.7 m f r6 430 w c41 0.1 m f r7 110 w c43 2.2 nf r9 3.0 k w c44 22 nf r11 7.1 k w c45 3.3 nf r12 r13 10 m w c50 10 m f r14 r15 r16 r17 r18 r19 100 k w c52 47 pf d1 diode c58 56 pf u1 mc2800 c73 1.0 m f filter1 safc284e75n x1 65.681250 mhz filter2 crystal filter 21.4 mhz x2 20.945000 mhz filter3 cfwc455d q1 q2 q3 q4 mmbr941lt1 archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 9 motorola rf/if device data table 2. saw filter specification part number safc284me75n [note] nominal center frequency, f o 284.0 mhz insertion loss f o 100 mhz to f o 37.5 mhz f o 4.0 mhz f o + 37.5 mhz to f o + 100 mhz 48 db min 4.5 db max 40 db min ripple within f o 4.0 mhz/db 2.0 max nominal input / output impedance 230 w // - 0.2 pf note: saw filter safc284me75n is the product of murata manufacturing co., ltd. for further enquiry, please refer to the murata's product catalog. table 3. crystal filter specification nominal center frequency, f o 21.400000 mhz 1.0 khz number of pole 2 poles pass band width 3.0 db / 7.5 khz min stop band width 18 db / 25.0 khz max pass band ripple 0.5 db max insertion loss 1.5 db max nominal input / output impedance 1.5 k w // 2.0 pf table 4. ceramic filter specification part number cfwc455d [note] nominal center frequency, f o 455 khz 3.0 db bandwidth from f o 8.0 khz 50 db bandwidth from f o 17.0 khz stop band attenuation within f o 18 to 33 khz within f o 100 khz 55 db min 50 db min spurious within 0.1 to 1.0 mhz 20 db min ripple within f o 7.5 khz 2.0 db max nominal input/output impedance 1.5 k w note: ceramic filter cfwc455d is the product of murata manufacturing co., ltd. for further inquiry, please refer to murata's product catalog. archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC2800EVK 10 motorola rf/if device data table 5. quartz crystal specification (a) 65.68125 mhz quartz crystal [note] part number 1u0656812d3035f0z nominal frequency, f o 65.68125 mhz holder type um1 resonance mode 3rd overtone operating temperature 30 to 80 c frequency tolerance @ 25 c 30 ppm load capacitance 30 pf equivalent series resistance, esr 60 w max shunt capacitance c 0 7.0 pf drive level 50 m w aging 5.0 ppm/year (b) 20.94500 mhz quartz crystal [note] part number 1u0209450d30f5d0z nominal frequency, f o 20.945 mhz holder type um1 resonance mode fundamental operating temperature 30 to 80 c frequency tolerance @ 25 c 20 ppm load capacitance 30 pf equivalent series resistance, esr 30 w max shunt capacitance c 0 7.0 pf drive level 0.5 mw aging 5.0 ppm/year note: the quartz crystals are the products of hong kong x'tals limited. for further inquiry, please refer to the product catalog of hong kong x'tals limited or hkxtals@hongkongcrystal.com . motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, represe ntation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the applicati on or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. atypicalo para meters which may be provided in motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all ope rating parameters, including atypicalso must be validated for each customer application by customer's technical experts. motorola does not convey any license under it s patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical imp lant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expens es, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/affirmative action employer. mfax is a trademark of motorola, inc. how to reach us: usa / europe / locations not listed : motorola literature distribution; japan : motorola japan ltd.; spd, strategic planning office, 141, p.o. box 5405, denver, colorado 80217. 13036752140 or 18004412447 4321 nishigotanda, shinagawaku, tokyo, japan. 813 54878488 customer focus center: 18005216274 mfax ? : rmfax0@email.sps.mot.com touchtone 1 6022446609 asia / pacific : motorola semiconductors h.k. ltd.; silicon harbour centre, motorola fax back system us & canada only 18007741848 2, dai king street, tai po industrial estate, tai po, n.t., hong kong. http://sps.motorola.com/mfax/ 85226668334 home page : http://motorola.com/sps/ MC2800EVK/d ? archive information archive information f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .

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