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rev. 4654b?cell?07/04 features supply-voltage range: 2.7 v to 5.5 v single-ended output, no balun required single-ended input for rf and lo excellent isolation characteristics power-down mode ip3 and compression point programmable 2.5-ghz operating frequency benefits reduced system costs as only few external component (no balun) are required small package very low current consumption easy to use electrostatic sensitive device. observe precautions for handling. description the u2795b is a 2.5-ghz mixer for wlan and rf telecommunications equipment, e.g., dect and pcn. the ic is manufactured using atmel's advanced bipolar technol- ogy. a double-balanced approach was chosen to assure good isolation characteristics and a minimum of spurious products. the input and output are single-ended, and their characteristics are programmable. no output transformer or balun is required. figure 1. block diagram r 1 voltage regulator v s 2 rf i 3 p v h 7 lo i 6 gnd v s 1 4 8 r 2 5 if o pd s o v h v r 2.5-ghz double- balanced mixer u2795b
2 u2795b 4654b?cell?07/04 pin configuration figure 2. pinning 1 2 3 45 6 7 8 vs rfi p ifo loi pu gnd so pin description pin symbol function 1 vs supply voltage 2rfirf input 3 p programming port ip3, cp 4 so output symmetry 5 ifo if output 6 gnd ground 7 loi lo input 8 pu power-up
3 u2795b 4654b?cell?07/04 functional description supply voltage the ic is designed for a supply-voltage range of 2.7 v to 5.5 v. as the ic is internally stabilized, the performance of the circuit is nearly independent of the supply voltage. input impedance the input impedance, z rfi , is about 700 ? with an additional capacitive component. this condition provides the best noise figure in combination with a matching network. 3rd order intercept point (ip3) the voltage divider, r p /r 1 , determinates both the input and output intercept point, iip3 and oip3. if the value of r p is infinite, the maximum value of iip3 reach about -4 dbm. the ip3/r p characteristics are shown in figure 3 and figure 4. output impedance and intercept point the output impedance is shown in figure 11 on page 8. both low output impedance and a high intercept point are defined to a high value of r p . current consumption, i s depending on the chosen input and output conditi ons of the ic, the current consump- tion, i s , is between 4 ma and 10 ma. the current consumption in dependence of r p is shown in figure 6 on page 6. power-up this feature provides extended battery lifetime. if this function is not used, pin 8 has to be connected to v s (pin 1). output symmetry the symmetry of the load current can be matched and thus optimized for a given load impedance. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability . parameters symbol value unit supply voltage v s 6v input voltage v i 0 to v s v junction temperature t j 125 c storage-temperature range t stg -40 to +125 c thermal resistance parameters symbol value unit junction ambient so8 r thja 175 k/w operating range parameters symbol value unit supply-voltage range v s 2.7 to 5.5 v ambient-temperature range t amb -40 to +85 c
4 u2795b 4654b?cell?07/04 electrical characteristics v s = 3 v, f loi = 1 ghz, if = 900 mhz, rf = 100 mhz, r p = , system impedance zo = 50 ? , t amb = 25c, r t = 56 ? reference point pin 6, unless otherwise specified no. parameters test conditions pin symbol min. typ. max. unit type* 1.1 supply voltage range 1 v s 2.7 5.5 v a 1.2 supply current v s = 2.7 v, r p = 10 k ? 1i s 913maa v s = 3.0 v, r p = 1i s 36.2maa 1.3 conversion power gain r l = 50 ? , r t = r l = 50 ? , r t = 56 ? 1 pg c pg c 9 4 db db b 2 operating frequencies 2.1 rf i frequency 2 rf i 10 2500 mhz d 2.2 lo i frequency 7 f loi 50 2500 mhz d 2.3 if o frequency 5 f ifo 50 2500 mhz d 3isolation 3.1 lo spurious at r fi p ilo = -10 to 0 dbm 7, 2 is lo-rf -30 dbm d 3.2 rf i to lo i p irf = -25 dbm 2, 7 is rf-lo 35 db d 3.3 lo spurious at if o p ilo = -10 to 0 dbm 5, 7 is lo-if -25 dbm d 3.4 if o to lo i 5, 7 is if-lo 30 db d 4 output (if) 4.1 output compression point 5 cp o -10 dbm d 5 input (rf) 5.1 input impedance 2 z rfi 700 || 0.8 ?| | pf d 5.2 input compression point 2 cp i -14 dbm d 5.3 3rd-order input intercept point 2iip3 -4 dbmd 6 input (lo) 6.1 lo level 7 p ilo -6 dbm d 7 voltage standing wave ratio (vswr) 7.1 input lo 7 vswr loi < 2 d 7.2 output if 4 vswr ifo < 2 d 8 noise performance 8.1 noise figure p ilo = 0 dbm, r t = nf 10 db d 9 power-down mode 9.1 supply current v pu < 0.5v v pu = 0 v 1i spu < 5 30 a a b b 10 power-down voltage 10.1 ?power on? v s = 3.5 to 5.5 v v s = 2.7 to 3.5 v 8 v pon v s -0.5 v s v s + 0.5 v s + 0.5 v v d d 10.2 ?power down? 8 v pdn 1vd 10.3 power-down current power on power down 8 i pon i pdn 0.15 < 5 0.22 ma a a d 10.4 settling time 5,8 t spd < 30 s d *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
5 u2795b 4654b?cell?07/04 figure 3. iip3 versus resistor r p , if: 900 mhz figure 4. oip3 versus resistor r p , if: 900 mhz figure 5. gain versus resistor r p , lo: 1030 mhz, level -10 dbm; rf: 130 mhz, -30 dbm, r t = 56 ? 020406080 -10 -9 -8 -7 -6 -4 i i p 3 ( d b m ) r p (k ? ) 100 -5 020406080 -25 -20 -15 -10 -5 0 o i p 3 ( d b m ) r p (k ? ) 100 020406080 -13 -9 -5 -1 3 g a i n ( d b ) r p (k ? ) 100
6 u2795b 4654b?cell?07/04 figure 6. supply current i s versus resistor r p figure 7. gain versus if output frequency, lo level: -6 dbm, rf: 130 mhz, -35 dbm; parameter: rf input termination figure 8. iip3 versus if output frequency, lo level: -6 dbm; rf: 130 mhz/ 130.1 mhz, -35 dbm; parameter: rf input termination 020406080 0 2 4 6 8 12 i s ( m a ) r p (k ? ) 100 10 0 500 1000 1500 2000 -2 2 6 10 14 18 g a i n ( d b ) if (mhz) 2500 with rf input matching l s = 220 nh, c p = 4.7 pf without r t with r t = 56 ? -18 -16 -14 -12 -10 -8 -6 -4 -2 0 0 500 1000 1500 2000 2500 if (mhz) iip3 (dbm) with r t = 56 ? with rf input matching l s = 220 nh, c p = 4.7 pf without r t
7 u2795b 4654b?cell?07/04 figure 9. double sideband noise figure versus if output frequency; lo: 1000 mhz, level 0 dbm; no rf input matching, r t left out figure 10. typical vswr frequency response of the if output, r p = 0 200 400 600 800 0 2 4 6 8 12 n f ( d b ) if (mhz) 10 100 280 460 640 820 1 2 3 4 5 v s w r if frequency (mhz) 1000
8 u2795b 4654b?cell?07/04 figure 11. typical impedance of the output versus r p at frequency f ifo = 900 mhz markers (from left to right): r p = /22 k ? /10 k ? /8.2 k ? /5.6 k ? figure 12. typical s11 frequency response of the if output, r p = , if frequency from 100 mhz to 1000 mhz, marker: 900 mhz -0.2j -0.5j -j -2j -5j 0 0.2j 0.5j j 2j 5j 0.2 0.5 1 2 5 -0.2j -0.5j -j -2j -5j 0 0.2j 0.5j j 2j 5j 0.2 0.5 1 2 5
9 u2795b 4654b?cell?07/04 figure 13. typical s11 frequency response of the rf input, r p = , r t = rf frequency from 100 mhz to 1000 mhz, marker: 900 mhz figure 14. typical s11 frequency response of the lo input, r p = , lo frequency from 100 mhz to 1000 mhz, marker: 900 mhz -0.2j -0.5j -j -2j -5j 0 0.2j 0.5j j 2j 5j 0.2 0.5 1 2 5 -0.2j -0.5j -j -2j -5j 0 0.2j 0.5j j 2j 5j 0.2 0.5 1 2 5
10 u2795b 4654b?cell?07/04 application if the part-list values are used, the pu settling time is < 20 s. using other values, time requirements in burst-mode applications have to be considered. the values of r so and r p depend on the input and output condition requirements. for r so , 68 ? is recommended. by means of the optional r i , the intercept and compression point can be slightly increased; values between 500 ? and 1 k ? are suitable. please note that such modifica- tion will also increase the supply current. table 1. part list part value c 1 10 nf c 2 , c 3 , c 4 , c 5 , c 6 , c 7 100 pf *r p 50- ? microstrip *r so 68 ? ? ? ? optional r t 56 ? 1 2 3 4 u 2 7 9 5 b v s 8 7 6 5 c 2 r p c 1 c 5 c 4 pu r t c 6 r so c 3 rf c 7 lo if r i
11 u2795b 4654b?cell?07/04 application circuit (evaluation board)
12 u2795b 4654b?cell?07/04 package information ordering information extended type number package remarks u2795b-mfp so8 tube u2795b-mfpg3 so8 taped and reeled technical drawings according to din specifications package so8 dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 85 14
printed on recycled paper. disclaimer: atmel corporation makes no warranty for the use of its products, other than those expressly contained in the company?s standar d warranty which is detailed in atmel?s terms and conditions located on the company?s web site. the company assumes no responsibi lity for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time wi thout notice, and does not make any commitment to update the information contained her ein. no licenses to patents or other intellectual property of atmel are granted by the company in connection with the sale of atmel produc ts, expressly or by implication. atmel?s products are not aut horized for use as critical components in life support devices or systems. atmel corporation atmel operations 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 487-2600 regional headquarters europe atmel sarl route des arsenaux 41 case postale 80 ch-1705 fribourg switzerland tel: (41) 26-426-5555 fax: (41) 26-426-5500 asia room 1219 chinachem golden plaza 77 mody road tsimshatsui east kowloon hong kong tel: (852) 2721-9778 fax: (852) 2722-1369 japan 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel: (81) 3-3523-3551 fax: (81) 3-3523-7581 memory 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 microcontrollers 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 la chantrerie bp 70602 44306 nantes cedex 3, france tel: (33) 2-40-18-18-18 fax: (33) 2-40-18-19-60 asic/assp/smart cards zone industrielle 13106 rousset cedex, france tel: (33) 4-42-53-60-00 fax: (33) 4-42-53-60-01 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 scottish enterprise technology park maxwell building east kilbride g75 0qr, scotland tel: (44) 1355-803-000 fax: (44) 1355-242-743 rf/automotive theresienstrasse 2 postfach 3535 74025 heilbronn, germany tel: (49) 71-31-67-0 fax: (49) 71-31-67-2340 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 biometrics/imaging/hi-rel mpu/ high speed converters/rf datacom avenue de rochepleine bp 123 38521 saint-egreve cedex, france tel: (33) 4-76-58-30-00 fax: (33) 4-76-58-34-80 literature requests www.atmel.com/literature 4654b?cell?07/04 ? atmel corporation 2004 . all rights reserved. atmel ? and combinations thereof are the registered tradem arks of atmel corporation or its subsidiaries. other terms and product names may be the trademarks of others.

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