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rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a ad8350 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 world wide web site: http://www.analog.com fax: 781/326-8703 ? analog devices, inc., 1999 low distortion 1.0 ghz differential amplifier functional block diagrams features high dynamic range output ip3: +22 dbm: re 50 v @ 250 mhz low noise figure: 5.9 db @ 250 mhz two gain versions: ad8350-15 15 db ad8350-20 20 db C3 db bandwidth: 1.0 ghz single supply operation: +5 v to +10 v supply current: 28 ma input/output impedance: 200 v single-ended or differential input drive 8-lead soic package applications cellular base stations communications receivers rf/if gain block differential a-to-d driver saw filter interface single-ended to differential conversion high performance video high speed data transmission product description the ad8350 series are high performance fully-differential amplifiers useful in rf and if circuits up to 1000 mhz. the amplifier has excellent noise figure of 5.9 db at 250 mhz. it offers a high output third order intercept (oip3) of +22 dbm at 250 mhz. gain versions of 15 db and 20 db are offered. the ad8350 is designed to meet the demanding performance requirements of communications transceiver applications. it enables a high dynamic range differential signal chain, with exceptional linearity and increased common-mode rejection. the device can be used as a general purpose gain block, an a-to-d driver, and high speed data interface driver, among other functions. the ad8350 input can also be used as a single- ended-to-differential converter. the amplifier can be operated down to +5 v with an oip3 of +22 dbm at 250 mhz and slightly reduced distortion perfor- mance. the wide bandwidth, high dynamic range and tempera- ture stability make this product ideal for the various rf and if frequencies required in cellular, catv, broadband, instrumen- tation and other applications. the ad8350 is offered in an 8-lead single soic package. it operates from +5 v and +10 v power supplies, drawing 28 ma typical. the ad8350 offers a power enable function for power- sensitive applications. the ad8350 is fabricated using analog devices proprietary high speed complementary bipolar process. the device is available in the industrial (C40 c to +85 c) temperature range. 8-lead soic package (with enable) 1 2 3 4 8 7 6 5 ad8350 in+ inC enbl out+ outC v cc gnd + C gnd
rev. 0 C2C ad8350-15Cspecifications (@ +25 8 c, v s = +5 v, g = 15 db, unless otherwise noted. all specifications refer to differential inputs and differential outputs unless noted.) parameter conditions min typ max units dynamic performance C3 db bandwidth v s = +5 v, v out = 1 v p-p 0.9 ghz v s = +10 v, v out = 1 v p-p 1.1 ghz bandwidth for 0.1 db flatness v s = +5 v, v out = 1 v p-p 270 mhz v s = +10 v, v out = 1 v p-p 270 mhz slew rate v out = 1 v p-p 2000 v/ m s settling time 0.1%, v out = 1 v p-p 10 ns gain (s21) 1 v s = +5 v, f = 50 mhz 14 15 16 db gain supply sensitivity v s = +5 v to +10 v, f = 50 mhz 0.003 db/v gain temperature sensitivity t min to t max C0.002 db/ c isolation (s12) 1 f = 50 mhz C18 db noise/harmonic performance 50 mhz signal second harmonic v s = +5 v, v out = 1 v p-p C66 dbc v s = +10 v, v out = 1 v p-p C67 dbc third harmonic v s = +5 v, v out = 1 v p-p C65 dbc v s = +10 v, v out = 1 v p-p C70 dbc output second order intercept 2 v s = +5 v 52 dbm v s = +10 v 52 dbm output third order intercept 2 v s = +5 v 22 dbm v s = +10 v 23 dbm 250 mhz signal second harmonic v s = +5 v, v out = 1 v p-p C48 dbc v s = +10 v, v out = 1 v p-p C49 dbc third harmonic v s = +5 v, v out = 1 v p-p C52 dbc v s = +10 v, v out = 1 v p-p C61 dbc output second order intercept 2 v s = +5 v 33 dbm v s = +10 v 34 dbm output third order intercept 2 v s = +5 v 18 dbm v s = +10 v 22 dbm 1 db compression point (rti) 2 v s = +5 v 2 dbm v s = +10 v 5 dbm voltage noise (rti) f = 150 mhz 1.7 nv/ ? hz noise figure f = 150 mhz 6.8 db input/output characteristics differential offset voltage (rti) v out+ C v outC 1mv differential offset drift t min to t max 0.02 mv/ c input bias current 15 m a input resistance real 200 w input capacitance 2pf cmrr f = 50 mhz C67 db output resistance real 200 w output capacitance 2pf power supply operating range +4 +11.0 v quiescent current powered up, v s = +5 v 25 28 32 ma powered down, v s = +5 v 3 3.8 5.5 ma powered up, v s = +10 v 27 30 34 ma powered down, v s = +10 v 3 4 6.5 ma power-up/down switching 15 ns power supply rejection ratio f = 50 mhz, v s d = 1 v p-p C58 db operating temperature range C40 +85 c notes 1 see tables iCiv for complete list of s-parameters. 2 re: 50 w . specifications subject to change without notice.
rev. 0 C3C ad8350 (@ +25 8 c, v s = +5 v, g = 20 db, unless otherwise noted. all specifications refer to differential inputs and differential outputs unless noted.) parameter conditions min typ max units dynamic performance C3 db bandwidth v s = +5 v, v out = 1 v p-p 0.7 ghz v s = +10 v, v out = 1 v p-p 0.9 ghz bandwidth for 0.1 db flatness v s = +5 v, v out = 1 v p-p 230 mhz v s = +10 v, v out = 1 v p-p 200 mhz slew rate v out = 1 v p-p 2000 v/ m s settling time 0.1%, v out = 1 v p-p 15 ns gain (s21) 1 v s = +5 v, f = 50 mhz 19 20 21 db gain supply sensitivity v s = +5 v to +10 v, f = 50 mhz 0.003 db/v gain temperature sensitivity t min to t max C0.002 db/ c isolation (s12) 1 f = 50 mhz C22 db noise / harmonic performance 50 mhz signal second harmonic v s = +5 v, v out = 1 v p-p C65 dbc v s = +10 v, v out = 1 v p-p C66 dbc third harmonic v s = +5 v, v out = 1 v p-p C66 dbc v s = +10 v, v out = 1 v p-p C70 dbc output second order intercept 2 v s = +5 v 50 dbm v s = +10 v 50 dbm output third order intercept 2 v s = +5 v 22 dbm v s = +10 v 23 dbm 250 mhz signal second harmonic v s = +5 v, v out = 1 v p-p C45 dbc v s = +10 v, v out = 1 v p-p C46 dbc third harmonic v s = +5 v, v out = 1 v p-p C55 dbc v s = +10 v, v out = 1 v p-p C60 dbc output second order intercept 2 v s = +5 v 31 dbm v s = +10 v 32 dbm output third order intercept 2 v s = +5 v 18 dbm v s = +10 v 22 dbm 1 db compression point (rti) 2 v s = +5 v C2.6 dbm v s = +10 v 1.8 dbm voltage noise (rti) f = 150 mhz 1.7 nv/ ? hz noise figure f = 150 mhz 5.6 db input/output characteristics differential offset voltage (rti) v out+ C v outC 1mv differential offset drift t min to t max 0.02 mv/ c input bias current 15 m a input resistance real 200 w input capacitance 2pf cmrr f = 50 mhz C52 db output resistance real 200 w output capacitance 2pf power supply operating range +4 +11.0 v quiescent current powered up, v s = +5 v 25 28 32 ma powered down, v s = +5 v 3 3.8 5.5 ma powered up, v s = +10 v 27 30 34 ma powered down, v s = +10 v 3 4 6.5 ma power-up/down switching 15 ns power supply rejection ratio f = 50 mhz, v s d = 1 v p-p C45 db operating temperature range C40 +85 c notes 1 see tables iCiv for complete list of s-parameters. 2 re: 50 w . specifications subject to change without notice. ad8350-20Cspecifications
rev. 0 ad8350 C4C caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the ad8350 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. warning! esd sensitive device ordering guide model temperature range package description package option ad8350ar15 C40 c to +85 c 8-lead soic so-8 ad8350ar15-reel 1 C40 c to +85 c 8-lead soic so-8 ad8350ar15-reel7 2 C40 c to +85 c 8-lead soic so-8 AD8350AR15-EVAL evaluation board (15 db) ad8350ar20 C40 c to +85 c 8-lead soic so-8 ad8350ar20-reel 1 C40 c to +85 c 8-lead soic so-8 ad8350ar20-reel7 2 C40 c to +85 c 8-lead soic so-8 ad8350ar20-eval evaluation board (20 db) notes 1 13" reels of 2500 each. 2 7" reels of 750 each. absolute maximum ratings* supply voltage, v s . . . . . . . . . . . . . . . . . . . . . . . . . . . . +11 v input power differential . . . . . . . . . . . . . . . . . . . . . . . +8 dbm internal power dissipation . . . . . . . . . . . . . . . . . . . . . 400 mw q ja . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 c/w maximum junction temperature . . . . . . . . . . . . . . . . +125 c operating temperature range . . . . . . . . . . . . C40 c to +85 c storage temperature range . . . . . . . . . . . . . C65 c to +150 c lead temperature range (soldering 60 sec) . . . . . . . . +300 c *stresses above those listed under absolute maximum ratings may cause perma- nent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may effect device reliability. pin configuration top view (not to scale) 8 7 6 5 1 2 3 4 in+ enbl v cc out+ inC gnd gnd outC ad8350 pin function descriptions pin function description 1, 8 in+, inC differential inputs. in+ and inC should be ac-coupled (pins have a dc bias of midsupply). differential input impedance is 200 w . 2 enbl power-up pin. a high level (5 v) en- ables the device; a low level (0 v) puts device in sleep mode. 3v cc positive supply voltage. +5 v to +10 v. 4, 5 out+, outC differential outputs. out+ and outC should be ac-coupled (pins have a dc bias of midsupply). differential input impedance is 200 w . 6, 7 gnd common external ground reference.
rev. 0 ad8350 C5C typical performance characteristicsC temperature C 8 c supply current C ma 50 C40 40 30 20 10 0 C20 0 20 40 60 80 v cc = 5v v cc = 10v figure 1. supply current vs. temperature frequency C mhz impedance C v 350 1 300 250 200 150 100 10 100 1k v cc = 10v v cc = 5v figure 4. ad8350-15 input imped- ance vs. frequency frequency C mhz impedance C v 500 1 400 300 200 100 0 10 100 1k v cc = 5v v cc = 10v figure 7. ad8350-20 output imped- ance vs. frequency frequency C mhz gain C db 20 1 15 10 5 0 10 100 1k 10k v cc = 10v v cc = 5v figure 2. ad8350-15 gain (s21) vs. frequency frequency C mhz impedance C v 350 1 300 250 200 150 100 10 100 1k v cc = 10v v cc = 5v figure 5. ad8350-20 input imped- ance vs. frequency frequency C mhz isolation C db C5 1 C10 C15 C20 C25 10 100 1k 10k v cc = 10v v cc = 5v figure 8. ad8350-15 isolation (s12) vs. frequency frequency C mhz gain C db 25 1 20 15 10 5 10 100 1k 10k v cc = 10v v cc = 5v figure 3. ad8350-20 gain (s21) vs. frequency frequency C mhz impedance C v 500 1 400 300 200 100 0 10 100 1k v cc = 10v v cc = 5v figure 6. ad8350-15 output imped- ance vs. frequency frequency C mhz isolation C db C10 1 C15 C20 C25 C30 10 100 1k 10k v cc = 10v v cc = 5v figure 9. ad8350-20 isolation (s12) vs. frequency
rev. 0 ad8350 C6C fundamental frequency C mhz distortion C dbc C40 0 C45 C50 C55 C60 C65 C70 C75 C80 50 100 150 200 250 300 v out = 1v p-p hd3 (v cc = 10v) hd3 (v cc = 5v) hd2 (v cc = 5v) hd2 (v cc = 10v) figure 10. ad8350-15 harmonic distortion vs. frequency output voltage C v p - p distortion C dbc C45 0 C55 C65 C75 C85 0.5 1 1.5 2 2.5 3 3.5 f o = 50mhz hd3 (v cc = 10v) hd3 (v cc = 5v) hd2 (v cc = 5v) hd2 (v cc = 10v) figure 13. ad8350-20 harmonic dis- tortion vs. differential output voltage frequency C mhz oip3 C dbm (re: 50 v ) 35 0 50 100 150 200 250 300 30 25 20 15 10 5 v cc = 10v v cc = 5v figure 16. ad8350-15 output referred ip3 vs. frequency fundamental frequency C mhz distortion C dbc C40 0 C45 C50 C55 C60 C65 C70 C75 C80 50 100 150 200 250 300 v out = 1v p-p hd3 (v cc = 10v) hd3 (v cc = 5v) hd2 (v cc = 5v) hd2 (v cc = 10v) figure 11. ad8350-20 harmonic distortion vs. frequency frequency C mhz oip2 C dbm (re: 50 v ) 60 0 50 100 150 200 250 300 55 50 45 40 35 30 v cc = 10v v cc = 5v figure 14. ad8350-15 output referred ip2 vs. frequency frequency C mhz oip3 C dbm (re: 50 v ) 35 0 50 100 150 200 250 300 30 25 20 15 10 5 v cc = 10v v cc = 5v figure 17. ad8350-20 output referred ip3 vs. frequency output voltage C v p-p distortion C dbc C45 0 C55 C65 C75 C85 0.5 1 1.5 2 2.5 3 3.5 f o = 50mhz hd3 (v cc = 10v) hd3 (v cc = 5v) hd2 (v cc = 5v) hd2 (v cc = 10v) figure 12. ad8350-15 harmonic dis- tortion vs. differential output voltage frequency C mhz oip2 C dbm (re: 50 v ) 60 0 50 100 150 200 250 300 55 50 45 40 35 30 v cc = 10v v cc = 5v figure 15. ad8350-20 output referred ip2 vs. frequency frequency C mhz 1db compression C dbm (re: 50 v ) 0 100 200 300 400 500 600 7.5 5.0 2.5 0 C2.5 C5.0 v cc = 10v v cc = 5v input referred 10.0 figure 18. ad8350-15 1 db compres- sion vs. frequency
rev. 0 ad8350 C7C frequency C mhz 1db compression C dbm (re: 50 v ) 0 100 200 300 400 500 600 7.5 5.0 2.5 0 C2.5 C5.0 v cc = 10v v cc = 5v input referred C7.5 figure 19. ad8350-20 1 db compres- sion vs. frequency v cc C volts 1 gain C db 25 20 15 10 5 0 C5 C10 C15 C20 2345678910 ad8350-20 ad8350-15 figure 22. ad8350 gain (s21) vs. supply voltage frequency C mhz psrr C db C20 1 C30 C40 C50 C60 C70 C80 C90 10 100 1k v cc = 5v ad8350-20 ad8350-15 figure 25. ad8350 cmrr vs. frequency frequency C mhz noise figure C db 10 0 50 100 150 200 250 300 350 400 450 500 9 8 7 6 5 v cc = 10v v cc = 5v figure 20. ad8350-15 noise figure vs. frequency temperature C 8 c output offset C mv 100 C40 50 0 C50 C100 C150 C200 C250 C20 0 20 40 60 80 v out C (v cc = 5v) v out C (v cc = 10v) v out + (v cc = 10v) v out + (v cc = 5v) figure 23. ad8350 output offset voltage vs. temperature 5v v cc = 5v 500mv 30ns v out enbl figure 26. ad8350 power-up/down response time frequency C mhz noise figure C db 10 0 50 100 150 200 250 300 350 400 450 500 9 8 7 6 5 v cc = 10v v cc = 5v figure 21. ad8350-20 noise figure vs. frequency frequency C mhz psrr C db C20 1 C30 C40 C50 C60 C70 C80 C90 10 100 1k v cc = 5v ad8350-20 ad8350-15 figure 24. ad8350 psrr vs. frequency
rev. 0 ad8350 C8C applications using the ad8350 figure 27 shows the basic connections for operating the ad 8350. a single supply in the range +5 v to +10 v is required. the power supply pin should be decoupled using a 0.1 m f capacitor. the enbl pin is tied to the positive supply or to +5 v (when v cc = +10 v) for normal operation and should be pulled to ground to put the device in sleep mode. both the inputs and the outputs have dc bias levels at midsupply and should be ac-coupled. also shown, in figure 27, are the impedance balancing require- ments, either resistive or reactive, of the input and output. with an input and output impedance of 200 w , the ad8350 should be driven by a 200 w source and loaded by a 200 w impedance. a reactive match can also be implemented. figure 28 shows how the ad8350 can be driven by a single- ended source. the unused input should be ac-coupled to ground. when driven single-ended, there will be a slight imbal- ance in the differential output voltages. this will cause an in- crease in the second order harmonic distortion (at 50 mhz, with v cc = +10 v and v out = 1 v p-p, C59 dbc was measured for the second harmonic on ad8350-15). 8 7 6 5 1 2 3 4 ad8350 + C enbl (+5v) +v s (+5v to +10v) c5 0.1 m f c4 0.001 m f c3 0.001 m f load z = 200 v c2 0.001 m f c1 0.001 m f source z = 100 v z = 100 v figure 27. basic connections for differential drive 8 7 6 5 1 2 3 4 ad8350 + C enbl (+5v) +v s (+5v to +10v) c5 0.1 m f c4 0.001 m f c3 0.001 m f load z = 200 v c2 0.001 m f source z = 200 v c1 0.001 m f figure 28. basic connections for single-ended drive reactive matching in practical applications, the ad8350 w ill most likely be matched using reactive matching components as shown in figure 29. matching components can be calculated using a smith chart and the ad8350s s-parameters (see tables i and ii) along with those of the devices that are driving and loading it. the s- parameters in tables i and ii assume a differential source and load impedance of 50 w . because the load impedance on the output of the ad8350 affects the input impedance, a simulta- neous conjugate match must be performed to correctly match both input and output. 8 7 6 5 1 2 3 4 ad8350 + C enbl (+5v) +v s (+5v to +10v) c2 0.1 m f c2 c2 c1 c1 l1 l2 figure 29. reactively matching the input and output
rev. 0 ad8350 C9C figure 30 shows how the ad8350 input can be matched for a single-ended drive. the unused input is ac-coupled to ground using a low impedance (i.e., high value) capacitance. the s- parameters for this configuration are shown in tables iii and iv. these values assume a single-ended source impedance of 50 w and a differential load impedance of 50 w . as in the case of a differential drive, a simultaneous conjugate match must be performed to correctly match both input and output. 8 7 6 5 1 2 3 4 ad8350 + C enbl (+5v) +v s (+5v to +10v) c2 0.1 m f c2 c2 0.001 m f c1 l2 l1 figure 30. matching circuit for single-ended drive evaluation board figure 31 shows the schematic of the ad8350 evaluation board as it is shipped from the factory. the board is configured to allow easy evaluation using single-ended 50 w test equipment. the input and output transformers have a 4-to-1 impedance ratio and transform the ad8350s 200 w input and output impedances to 50 w . in this mode, 0 w resistors (r1 and r4) are required. to allow compensation for the insertion loss of the transform- ers, a calibration path is provided at test in and test out. this consists of two transformers connected back to back. to drive and load the board differentially, transformers t1 and t2 should be removed and replaced with four 0 w resistors (0805 size); resistors r1 and r4 (0 w ) should also be removed. this yields a circuit with a broadband input and output imped- ance of 200 w . to match to impedances other than this, match- ing components (0805 size) can be placed on pads c1, c2, c3, c4, l1 and l2. 8 7 6 5 1 2 3 4 ad8350 + C +v s c5 0.1 m f l1 (open) l2 (open) c3 0.001 m f c2 0.001 m f c4 0.001 m f +v s 1 2 3 a b sw1 61 r2 0 v c1 0.001 m f r1 0 v t1: tc4-1w (mini circuits) inC in+ r3 0 v 6 t2: tc4-1w (mini circuits) r4 0 v outC out+ 16 t4: tc4-1w (mini circuits) test out 61 t3: tc4-1w (mini circuits) test in 1 figure 31. ad8350 evaluation board
rev. 0 ad8350 C10C table i. typical s parameters ad8350-15: v cc = 5 v, differential input signal. z source (diff) = 50 v , z load (diff) = 50 v frequency (mhz) s11 s12 s21 s22 50 0.791 e C3 0.068 e 177 2.73 e C3 0.795 e C2 100 0.787 e C6 0.071 e 174 2.79 e C7 0.794 e C5 150 0.778 e C9 0.070 e 172 2.91 e C11 0.787 e C7 200 0.766 e C13 0.072 e 168 3.06 e C16 0.779 e C10 250 0.749 e C17 0.074 e 165 3.24 e C21 0.768 e C12 table ii. typical s parameters ad8350-20: v cc = 5 v, differential input signal. z source (diff) = 50 v , z load (diff) = 50 v frequency (mhz) s11 s12 s21 s22 50 0.810 e C4 0.046 e 176 4.82 e C2.5 0.822 e C3 100 0.795 e C8 0.043 e 173 4.99 e C6.16 0.809 e C5 150 0.790 e C12 0.045 e 169 5.30 e C9.82 0.807 e C8 200 0.776 e C17 0.046 e 165 5.71 e C14.89 0.795 e C10 250 0.757 e C22 0.048 e 162 6.25 e C21.29 0.783 e C13 table iii. typical s parameters ad8350-15: v cc = 5 v, single-ended input signal. z source (diff) = 50 v , z load (diff) = 50 v frequency (mhz) s11 s12 s21 s22 50 0.718 e C6 0.068 e 177 2.62 e C4 0.798 e C3 100 0.701 e C12 0.066 e 173 2.66 e C10 0.794 e C6 150 0.683 e C19 0.067 e 167 2.76 e C15 0.789 e C10 200 0.657 e C24 0.069 e 163 2.86 e C22 0.776 e C13 250 0.625 e C31 0.070 e 159 2.98 e C28 0.763 e C16 table iv. typical s parameters ad8350-20: v cc = 5 v, single-ended input signal. z source (diff) = 50 v , z load (diff) = 50 v frequency (mhz) s11 s12 s21 s22 50 0.747 e C7 0.040 e 175 4.71 e C4 0.814 e C3 100 0.739 e C14 0.042 e 170 4.82 e C9 0.813 e C6 150 0.728 e C21 0.044 e 166 5.08 e C15 0.804 e C10 200 0.698 e C29 0.045 e 161 5.37 e C22 0.792 e C13 250 0.659 e C37 0.048 e 156 5.76 e C30 0.774 e C16
rev. 0 ad8350 C11C outline dimensions dimensions shown in inches and (mm). 8-lead plastic soic (so-8) 85 4 1 0.1968 (5.00) 0.1890 (4.80) 0.2440 (6.20) 0.2284 (5.80) pin 1 0.1574 (4.00) 0.1497 (3.80) 0.0500 (1.27) bsc 0.0688 (1.75) 0.0532 (1.35) seating plane 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 8 0 8 0.0196 (0.50) 0.0099 (0.25) 3 45 8 c3577C8C4/99 printed in u.s.a.

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