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www.lansdale.com page 1 of 16 issue a ML13155 wideband fm if legacy device: motorola mc13155 the ML13155 is a complete wideband fm detector designed for satellite tv and other wideband data and analog fm applica- tions. this device may be cascaded for higher if gain and extended receive signal strength indicator (rssi) range. 12 mhz video/baseband demodulator ideal for wideband data and analog fm systems limiter output for cascade operation low drain current: 7.0 ma low supply voltage: 3.0 to 6.0 v operates to 300 mhz operating temperature range t a = 40 to +85c so?6 = -5p plastic package case 751b (so?6) 16 1 cross reference/ordering information motorola so 16 mc13155d ML13155-5p lansdale package note : lansdale lead free ( pb ) product, as it becomes available, will be identified by a part number prefix change from ml to mle . pin connections 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 (top view) 9 input decouple v cc 1 output output v cc 2 limiter out quad coil input decouple v ee 1 rssi buffer rssi v ee 2 limiter out quad coil semiconductor technical data maximum ratings rating pin symbol value unit power supply voltage 11, 14 v ee (max) 6.5 vdc input voltage 1, 16 v in 1.0 vrms junction temperature t j +150 c storage temperature range t stg 65 to +150 c note: devices should not be operated at or outside these values. the ?ecommended operating conditions?provide for actual device operation. figure 1. representative block diagram three stage amplifier detector quad coil 8 9 limiter output balanced outputs decouple 7 5 4 2 1 16 10 12 13 limiter output rssi output buffered rssi output 15 decouple note: this device requires careful layout and decoupling to ensure stable operation. input input
www.lansdale.com page 2 of 16 issue a ML13155 lansdale semiconductor, inc. recommended operating conditions rating pin symbol value unit power supply voltage (t a = 25?) 11, 14 v ee 3.0 to 6.0 vdc 40c t a 85? 3, 6 v cc grounded maximum input frequency 1, 16 f in 300 mhz ambient temperature range t j 40 to + 85 ? dc electrical characteristics (t a = 25?, no input signal.) characteristic pin symbol min typ max unit drain current 11 i 11 2.0 2.8 4.0 ma (v ee = 5.0 vdc) 14 i 14 3.0 4.3 6.0 (v ee = 5.0 vdc) 14 i 14 3.0 4.3 6.0 drain current total (see figure 3) 11, 14 i to tal 5.0 7.1 10 ma (v ee = 5.0 vdc) 5.0 7.5 10.5 (v ee = 6.0 vdc) 5.0 7.5 10.5 (v ee = 3.0 vdc) 4.7 6.6 9.5 ac electrical characteristics (t a = 25?, f if = 70 mhz, v ee = 5.0 vdc figure 2, unless otherwise noted.) characteristic pin min typ max unit input for 3 db limiting sensitivity 1, 16 1.0 2.0 mvrms differential detector output voltage (v in = 10 mvrms) 4, 5 mv p? (f dev = 3.0 mhz) (v ee = 6.0 vdc) 470 590 700 (v ee = 5.0 vdc) 450 570 680 (v ee = 3.0 vdc) 380 500 620 detector dc offset voltage 4, 5 250 250 mvdc rssi slope 13 1.4 2.1 2.8 a/db rssi dynamic range 13 31 35 39 db rssi output 12 a (v in = 100 vrms) 2.1 (v in = 1.0 mvrms) 2.4 (v in = 10 mvrms) 16 24 36 (v in = 100 mvrms) 65 (v in = 500 mvrms) 75 rssi buffer maximum output current (v in = 10 mvrms) 13 2.3 madc differential limiter output mvrms (v in = 1.0 mvrms) 7, 10 100 140 (v in = 10 mvrms) 180 demodulator video 3.0 db bandwidth 4, 5 12 mhz input impedance (figure 14) 1, 16 @ 70 mhz rp (v ee = 5.0 vdc) 450 @ 70 mhz cp (c 2 =c 15 = 100 p) 4.8 pf differential if power gain 1, 7, 10, 16 46 db note : positive currents are out of the pins of the device. ?
www.lansdale.com page 3 of 16 issue a ML13155 lansdale semiconductor, inc. the ML13155 consists of a wideband threestage limiting amplifier, a wideband quadrature detector which may be operated up to 200 mhz, and a received signal strength indicator (rssi) circuit which provides a current output lin- early proportional to the if input signal level for approxi- mately 35 db range of input level. + 10 figure 2. test circuit limiter 2 output limiter 1 output video output v in 330 1.0n 49.9 1.0n 27 1.0k 100n 330 l1 ?coilcraft part number 146?9j08s l1 260n 20p 499 v ee v ee v ee + 10n 1.0n 1.0n 1.0n 1.0n 100n 1.0n in2 dec2 v ee 1 rssi buffer rssi v ee 2 limo2 quad2 quad1 limo1 v cc 2 deto2 deto1 v cc 1 dec1 in1 9 10 11 12 13 14 15 16 8 7 6 5 4 3 2 1 10 evaluation pc board the evaluation pcb shown in figures 19 and 20 is very ver- satile and is designed to cascade two ics. the center section of the board provides an area for attaching all surface mount components to the circuit side and radial leaded components to the component ground side of the pcb (see figures 17 and 18). additionally, the peripheral area surrounding the rf core provides pads to add supporting and interface circuitry as a particular application dictates. this evaluation board will be discussed and referenced in this section. limiting amplifier differential input and output ports interfacing the three stage limiting amplifier provide a differential power gain of typical- ly 46 db and useable frequency range of 300 mhz. the if gain flatness may be controlled by decoupling of the internal feedback network at pins 2 and 15. scattering parameter (sparameter) characterization of the if as a two port linear amplifier is useful to implement maxi- mum stable power gain, input matching, and stability over a desired bandpass response and to ensure stable operation out- side the bandpass as well. the ML13155 is unconditionally stable over most of its useful operating frequency range; how- ever, it can be made unconditionally stable over its entire operating range with the proper decoupling of pins 2 and 15. relatively small decoupling capacitors of about 100 pf have a significant effect on the wideband response and stability. this is shown in the scattering parameter tables where sparameters are shown for various values of c2 and c15 and at v ee of 3.0 and 5.0 v dc. applications information circuit description
www.lansdale.com page 4 of 16 issue a ML13155 lansdale semiconductor, inc. 5.0 vdc rssi output ( a) 12 i , drain current (madc) 14 i and i , 11 v in , input voltage (mvrms) t a, ambient temperature ( c) rssi output ( a) 12 i , total drain current (madc) 11 and i , 14 i i 14 and i total , drain current (madc) 0.1 t a, ambient temperature ( c) 10 f, frequency (mhz) 50 t a, ambient temperature ( c) figure 3. drain current versus supply voltage figure 4. rssi output versus frequency and input signal level figure 5. total drain current versus ambient temperature and supply voltage figure 6. detector drain current and limiter drain current versus ambient temperature figure 7. rssi output versus ambient temperature and supply voltage 0.0 v ee , supply voltage (?dc) figure 8. rssi output versus input signal voltage (v in at temperature) 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 100 1000 30 10 10 30 50 70 90 110 1.0 10 100 1000 t a = 25 c 0 dbm ?0 dbm 20 dbm 30 dbm 40 dbm i 14 50 30 ?0 10 30 50 70 90 110 50 30 ?0 10 30 50 70 90 110 i 11 rssi output ( a) 12 i , i total = i 14 + i 11 i 14 v ee = 5.0vdc f = 70 mhz v ee = 5.0 vdc v ee = 6.0 vdc 3.0 vdc v ee = 6.0 vdc v ee = 5.0 vdc v ee = 3.0 vdc t a = + 85 c 40 c + 25 c typical performance at temperature (see figure 2. test circuit) 100 5.5 9.0 10 8.0 6.0 4.0 2.0 0.0 100 80 60 40 20 0 5.0 5.0 4.5 4.0 3.5 3.0 2.0 80 60 40 20 0 25.0 24.5 24.0 23.5 23.0 22.5 22.0 21.5 8.5 8.0 7.5 7.0 6.5 6.0 5.5 2.5
www.lansdale.com page 5 of 16 issue a ML13155 lansdale semiconductor, inc. 1.0 mhz v ee = 6.0 vdc differential detector output (mv pp ) differential detector output voltage (pins 4, 5), (mv ) pp t a, ambient temperature (c) t a, ambient temperature (c) differential limiter output voltage (pins 7, 10), (mvrms) figure 9. differential detector output voltage versus ambient temperature and supply voltage figure 10. differential limiter output voltage versus ambient temperature (v in = 1 and 10 mvrms) 50 30 ?0 10 30 50 70 90 110 50 30 ?0 10 30 50 70 90 v in = 10 mvrms differential detector output (mv pp if input (dbm) q of quadrature lc tank if input, (dbm) figure 11. figure 12. rssi output voltage versus if input figure 11a. differential detector output voltage versus q of quadrature lc tank 1.5 q of quadrature lc tank figure 11b. differential detector output voltage versus q of quadrature lc tank 2.5 3.5 4.5 5.5 rssi output voltage, (vdc) s+n, n (db) 80 60 40 20 0 20 2.0 3.0 4.0 5.0 6.0 1.5 2.5 3.5 4.5 5.5 2.0 3.0 4.0 5.0 6.0 v in = 30 dbm v ee = 5.0 vdc f c = 70 mhz f mod = 1.0 mhz (figure 16 no external capacitors between pins 7, 8 and 9, 10) 90 70 50 30 10 10 s+n v in = 1.0 mvrms ) 5.0 vdc 3.0 vdc f = 70 mhz v ee = 5.0 vdc f dev = 6.0 mhz 5.0 mhz 4.0 mhz 3.0 mhz 2.0 mhz 1.0 mhz 2.0 mhz 3.0 mhz 4.0 mhz 5.0 mhz f dev = 6.0 mhz 15 db interstage attenuator n v in = 30 dbm v ee = 5.0 vdc f c = 70 mhz f mod = 1.0 mhz (figure 16 no external capacitors between pins 7, 8 and 9, 10) f c = 70 mhz f mod = 1.0 mhz f dev = 5.0 mhz v ee = 5.0 vdc figure 13. s+n, n versus if input 750 220 200 180 160 140 120 700 650 600 550 500 450 400 350 0 1600 1200 800 400 200 0 2400 1600 1200 800 400 0 1.0 2.0 3.0 4.0 5.0 1400 1000 600 2000 10 ?0 30 50 60 70 0 20 40 v ee = 5.0 vdc f c = 70 mhz (see figure 16) capacitively coupled interstage: no attenuation
www.lansdale.com page 6 of 16 issue a ML13155 lansdale semiconductor, inc. in2 dec2 v ee 1 rssi buffer rssi v ee 2 limo2 quad2 quad1 limo1 v cc 2 deto2 deto1 v cc 1 dec1 in1 9 10 11 12 13 14 15 16 8 7 6 5 4 3 2 1 figure 14. s?arameter test circuit sma if input v ee + 100n 1.0n 47 1.0n c15 1.0n c2 1.0n sma 47 1.0n if output 10 in the sparameters measurements, the if is treated as a twoport linear class a amplifier. the if amplifier is meas- ured with a singleended input and output configuration in which the pins 16 and 7 are terminated in the series combina- tion of a 47 resistor and a 10 nf capacitor to v cc ground (see figure 14. sparameter test circuit). the sparameters are in polar form a the magnitude (mag) and angle (ang). also listed in the tables are the calculated values for the stability and factor (k) and the maximum available gain (mag). these terms are related in the follow- ing equations: k = (1is 11 i 2 ?s 22 i 2 + i ? i 2 )/(2 i s 12 s 21 i) where: i ? i = i s 11 s 22 ? 12 s 21 i. mag = 10 log i s 21 i/i s 12 i + 10 log i k(k 2 ?) 1/2 i where: k >1. the necessary and sufficient conditions for unconditional stability are given as k>1: b1 = 1 + i s 11 i 2 i s 22 i 2 i ? i 2 > 0
www.lansdale.com page 7 of 16 issue a ML13155 lansdale semiconductor, inc. s?arameters (v ee = 5.0 vdc, t a = 25 c, c 2 and c 15 = 0 pf) frequency input s11 forward s21 rev s12 output s22 k mag mhz mag ang mag ang mag ang mag ang mag db 1.0 0.94 ?3 8.2 143 0.001 7.0 0.87 22 2.2 32 2.0 0.78 ? 3 23.5 109 0.001 40 0.64 31 4.2 33.5 5.0 0.48 1.0 39.2 51 0.001 97 0.34 ?7 8.7 33.7 7.0 0.59 15 40.3 34 0.001 41 0.33 ?3 10.6 34.6 10 0.75 17 40.9 19 0.001 82 0.41 ?.0 5.7 36.7 20 0.95 7.0 42.9 6.0 0.001 42 0.45 0 1.05 46.4 50 0.98 ?0 42.2 48 0.001 9.0 0.52 3.0 0.29 70 0.95 ?6 39.8 68 0.001 112 0.54 ?6 1.05 46.4 100 0.93 ? 3 44.2 93 0.001 80 0.53 22 0.76 150 0.91 ? 4 39.5 ?39 0.001 106 0.50 34 0.94 200 0.87 ? 7 34.9 ?79 0.002 77 0.42 44 0.97 500 0.89 ?03 11.1 58 0.022 57 0.40 ?17 0.75 700 0.61 ?56 3.5 ?64 0.03 0 0.52 179 2.6 13.7 900 0.56 162 1.2 92 0.048 44 0.47 112 4.7 4.5 1000 0.54 131 0.8 42 0.072 48 0.44 76 5.1 0.4 s?arameters (v ee = 5.0 vdc, t a = 25 c, c 2 and c 15 = 100 pf) frequency input s11 forward s21 rev s12 output s22 k mag mhz mag ang mag ang mag ang mag ang mag db 1.0 0.98 ?5 11.7 174 0.001 ?4 0.84 27 1.2 37.4 2.0 0.50 2.0 39.2 85.5 0.001 ?08 0.62 35 6.0 35.5 5.0 0.87 8.0 39.9 19 0.001 100 0.47 9.0 4.2 39.2 7.0 0.90 5.0 40.4 9.0 0.001 40 0.45 8.0 3.1 40.3 10 0.92 3.0 41 1.0 0.001 40 0.44 5.0 2.4 41.8 20 0.92 2.0 42.4 ?4 0.001 87 0.49 6.0 2.4 41.9 50 0.91 8.0 41.2 45 0.001 85 0.50 5.0 2.3 42 70 0.91 ?1 39.1 63 0.001 76 0.52 4.0 2.2 41.6 100 0.91 ?5 43.4 84 0.001 85 0.50 ?1 1.3 43.6 150 0.90 22 38.2 ?26 0.001 96 0.43 22 1.4 41.8 200 0.86 33 35.5 ?60 0.002 78 0.43 21 1.3 39.4 500 0.80 66 8.3 9.0 0.012 75 0.57 63 1.7 23.5 700 0.62 96 2.9 95 0.013 50 0.49 ?11 6.3 12.5 900 0.56 ?20 1.0 ?71 0.020 53 0.44 ?50 13.3 2.8 1000 0.54 ?36 0.69 154 0.034 65 0.44 ?79 12.5 0.8
www.lansdale.com page 8 of 16 issue a ML13155 lansdale semiconductor, inc. s?arameters (v ee = 5.0 vdc, t a = 25 c, c 2 and c 15 = 680 pf) frequency input s11 forward s21 rev s12 output s22 k mag mhz mag ang mag ang mag ang mag ang mag db 1.0 0.74 4.0 53.6 110 0.001 101 0.97 35 0.58 2.0 0.90 3.0 70.8 55 0.001 60 0.68 34 1.4 45.6 5.0 0.91 0 87.1 21 0.001 ?21 0.33 60 1.1 49 7.0 0.91 0 90.3 11 0.001 ?8 0.25 67 1.2 48.4 10 0.91 2.0 92.4 2.0 0.001 33 0.14 67 1.5 47.5 20 0.91 4.0 95.5 ?6 0.001 63 0.12 ?5 1.3 48.2 50 0.90 8.0 89.7 50 0.001 43 0.24 26 1.8 46.5 70 0.90 ?0 82.6 ?0 0.001 92 0.33 21 1.4 47.4 100 0.91 ?4 77.12 ?3 0.001 23 0.42 ?.0 1.05 49 150 0.94 20 62.0 ?22 0.001 96 0.42 22 0.54 200 0.95 33 56.9 ?48 0.003 146 0.33 62 0.75 500 0.82 63 12.3 ?2 0.007 79 0.44 67 1.8 26.9 700 0.66 98 3.8 ?07 0.014 84 0.40 ?15 4.8 14.6 900 0.56 ?22 1.3 177 0.028 78 0.39 ?66 8.0 4.7 1000 0.54 ?39 0.87 141 0.048 76 0.41 165 7.4 0.96 s?arameters (v ee = 3.0 vdc, t a = 25 c, c 2 and c 15 = 0 pf) frequency input s11 forward s21 rev s12 output s22 k mag mhz mag ang mag ang mag ang mag ang mag db 1.0 0.89 ?4 9.3 136 0.001 2.0 0.84 27 3.2 30.7 2.0 0.76 22 24.2 105 0.001 90 0.67 37 3.5 34.3 5.0 0.52 5.0 35.7 46 0.001 32 0.40 ?3 10.6 33.3 7.0 0.59 12 38.1 34 0.001 41 0.40 ?0 9.1 34.6 10 0.78 15 37.2 16 0.001 92 0.40 ?.0 5.7 36.3 20 0.95 5.0 38.2 9.0 0.001 47 0.51 4.0 0.94 50 0.96 ?1 39.1 50 0.001 ?03 0.48 6.0 1.4 43.7 70 0.93 ?7 36.8 71 0.001 76 0.52 ?3 2.2 41.4 100 0.91 25 34.7 99 0.001 ?52 0.51 ?9 3.0 39.0 150 0.86 37 33.8 ?43 0.001 53 0.49 34 1.7 39.1 200 0.81 49 27.8 86 0.003 76 0.55 56 2.4 35.1 500 0.70 93 6.2 41 0.015 93 0.40 ?10 2.4 19.5 700 0.62 ?44 1.9 ?33 0.049 56 0.40 ?50 3.0 8.25 900 0.39 ?76 0.72 125 0.11 ?8 0.25 163 5.1 ?.9 1000 0.44 166 0.49 80 0.10 52 0.33 127 7.5 4.8
www.lansdale.com page 9 of 16 issue a ML13155 lansdale semiconductor, inc. s?arameters (v ee = 3.0 vdc, t a = 25 c, c 2 and c 15 = 100 pf) frequency input s11 forward s21 rev s12 output s22 k mag mhz mag ang mag ang mag ang mag ang mag db 1.0 0.97 ?5 11.7 171 0.001 4.0 0.84 27 1.4 36.8 2.0 0.53 2.0 37.1 80 0.001 91 0.57 31 6.0 34.8 5.0 0.88 7.0 37.7 18 0.001 9.0 0.48 7.0 3.4 39.7 7.0 0.90 5.0 37.7 8.0 0.001 ?1 0.49 7.0 2.3 41 10 0.92 2.0 38.3 1.0 0.001 59 0.51 9.0 2.0 41.8 20 0.92 2.0 39.6 ?5 0.001 29 0.48 3.0 1.9 42.5 50 0.91 8.0 38.5 46 0.001 21 0.51 7.0 2.3 41.4 70 0.91 ?1 36.1 64 0.001 49 0.50 8.0 2.3 40.8 100 0.91 ?5 39.6 85 0.001 114 0.52 ?3 1.7 37.8 150 0.89 22 34.4 ?28 0.001 120 0.48 23 1.6 40.1 200 0.86 33 32 ?63 0.002 86 0.40 26 1.7 37.8 500 0.78 64 7.6 ?2 0.013 94 0.46 71 1.9 22.1 700 0.64 98 2.3 ?02 0.027 58 0.42 ?09 4.1 10.1 900 0.54 ?22 0.78 179 0.040 38.6 0.35 ?47 10.0 0.14 1000 0.53 ?36 0.47 144 0.043 23 0.38 ?71 15.4 4.52 s?arameters (v ee = 3.0 vdc, t a = 25 c, c 2 and c 15 = 680 pf) frequency input s11 forward s21 rev s12 output s22 k mag mhz mag ang mag ang mag ang mag ang mag db 1.0 0.81 3.0 37 101 0.001 ?9 0.90 32 1.1 43.5 2.0 0.90 2.0 47.8 52.7 0.001 82 0.66 39 0.72 5.0 0.91 0 58.9 20 0.001 104 0.37 56 2.3 44 7.0 0.90 ? 60.3 11 0.001 76 0.26 55 2.04 44 10 0.91 2.0 61.8 3.0 0.001 105 0.18 52 2.2 43.9 20 0.91 4.0 63.8 15 0.001 59 0.11 ?3 2.0 44.1 50 0.90 8.0 60.0 48 0.001 96 0.22 33 2.3 43.7 70 0.90 ?1 56.5 67 0.001 113 0.29 15 2.3 43.2 100 0.91 ?4 52.7 91 0.001 177 0.36 5.0 2.0 43 150 0.93 21 44.5 ?26 0.001 155 0.35 ?7 1.8 42.7 200 0.90 43 41.2 ?62 0.003 144 0.17 31 1.6 34.1 500 0.79 65 7.3 ?3 0.008 80 0.44 75 3.0 22 700 0.65 97 2.3 ?07 0.016 86 0.38 ?24 7.1 10.2 900 0.56 ?22 0.80 174 0.031 73 0.38 ?74 12 0.37 1000 0.55 ?39 0.52 137 0.50 71 0.41 157 11.3 3.4
www.lansdale.com page 10 of 16 issue a ML13155 lansdale semiconductor, inc. block diagram of 70 mhz video receiver application circuit input 45 dbm 70 dbm 72 dbm 32 dbm 47 dbm minimum input to acquire level: 1.26 mvrms 71 vrms 57 vrms 57 vrms 1.0 mvrms limiting in ML13155 ML13155 7 10 1 16 1 16 ML13155 40 db gain ?5 db (attenuator) 40 db gain 1:4 transformer 2.0 db (insertion loss) 25 db (insertion loss) saw filter if input dc biasing considerations the dc biasing scheme utilizes two vcc connections (pins 3 and 6) and two v ee connections (pins 14 and 11). v ee 1 (pin 14) is connected internally to the if and rssi circuits negative supply bus while the v ee 2 (pin 11) is connected internally to the quadrature detectors negative bus. under positive ground operation, this unique configuration offers the ability to bias the rssi and if sepa- rately from the quadrature detector. when two ics are cascaded as shown in the 70 mhz application circuit and provided by the pcb (see figures 17 and 18), the first ML13155 is used without biasing its quadrature detector, thereby saving approximately 3.0 ma. a total current of 7.0 ma is used to fully bias each ic, thus the total current in the application circuit is approximately 11 ma. both v cc pins are biased by the same supply. v cc 1 (pin 3) is connected inter- nally to the positive bus of the first half of the if limiting amplifier, while v cc 2 is internally connected to the positive bus of the rssi, the quadrature detector circuit, and the second half of the if limiting amplifier (see figure 15). this distribution of the v cc enhances the stability of the ic. rssi circuitry the rssi circuitry provides typically 35 db of linear dynamic range and its output voltage swing is adjusted by selection of the resistor from pin 12 to v ee . the rssi slope is typically 2.1 a/db; thus, for a dynamic range of 35 db, the current output is approximately 74 a. a 47 k resistor will yield an rssi output voltage swing of 3.5 vdc. the rssi buffer output at pin 13 is an emitterfollower and needs an external emitter resistor of 10 k to v ee . in a cascaded configuration (see circuit application in figure 16), only one of the rssi buffer outputs (pin 13) is used; the rssi out- puts (pin 12 of each ic) are tied together and the one closest to the v ee supply trace is decoupled to vcc ground. the two pins are connected to v ee through a 47 k resistor. this resistor sources a rssi current which is proportional to the signal level at the if input; typically 1.0 mvms (47 dbm) is required to place the ML13155 into limiting. the measured rssi output voltage response of the application circuit is shown in figure 12. since the rssi current output is dependent upon the input signal level at the if input, a careful accounting of filter losses, matching and other losses and gains must be made in the entire receiver system. in the block dia- gram of the application circuit shown below, an accounting of the signal levels at points throughout the system shows how the rssi response in figure 12 is justified. cascading stages the limiting if output is pinnedout differentially, cascading is easi- ly achieved by ac coupling stage to stage. in the evaluation pcb, ac coupling is shown, however interstage filtering may be desirable in some application. in which case, the sparameters provide a means to implement a low loss interstage match and better receiver sensitivity. where a linear response of the rssi output is desired when cascad- ing the ics, it is necessary to provide at least 10 db of interstage loss. figure 12 shows the rssi response with and without interstage loss. a 15 db resistive attenuator is an inexpensive way to linearize the rssi response. this has its drawbacks since it is a wideband noise source that is dependent upon the source and load impedance and the amount of attenuation that it provides. a better, although more costly, solution would be a bandpass filter designed to the desired center frequency and bandpass response while carefully selecting the insertion loss. a network topology shown below may be used to provide a bandpass response with the desired insertion loss. 1.0n 1 16 7 10 0.22 1.0n network topology
www.lansdale.com page 11 of 16 issue a ML13155 lansdale semiconductor, inc. quadrature detector the quadrature detector is coupled to the if with internal 2.0 pf. capacitors between pins 7 and 8 and pins 9 and 10. for wideband data applications, such as fm video and satellite receivers, the drive to the the detector can be increased with additional external capacitors between these pins, thus, the recovered video signal level output is increased for a given bandwidth (see figure 11a and figure 11b). the wideband performance of the detector is controlled by the loaded q of the lc tank circuit. the following equation defines the components which set the detector circuit's band- width: q=r t /x l (1) where: r t is the equivalent shunt resistance across the lc tank and x l is the reactance of the quadrature inductor at the if frequency (x l = 2 fl). the inductor and capacitor are chosen to form a resonant lc tank with the pcb and parasitic device capacitance at the desired if center frequency as predicted by: fc = (2 (lc p )) 1 (2) where: l is the parallel tank inductor and c p is the equivalent parallel capacitance of the parallel resonant tank circuit. the following is a design example for a wideband detector at 70 mhz and a loaded q of 5. the loaded q of the quadrature detector is chosen somewhat less than the q of the if band- pass. for an if frequency of 70 mhz and an if bandpass of 10.9 mhz, the if bandpass q is approximately 6.4. example: let the external cext = 20 pf. (the minimum value here should be greater than 15 pf making it greater than the inter- nal device and pcb parasitic capacitance. cint 3.0 pf). c p = cint + cext = 23 pf rewrite equation 2 and solve for l: l = (0.159) 2 /(c p fc 2 ) l = 198 nh, thus, a standard value is chosen. l = 0.22 h (tunable shielded inductor). the value of the total damping resistor to obtain the required loaded q of 5 can be calculated by rearranging equation 1: rt = q(2 fl) rt = 5(2 )(70)(0.22) - 483.8 the internal resistance, rint between the quadrature tank pins 8 and 9 is approximately 3200 and is considered in deter- mining the external resistance, rext which is calculated from: rext = ((r t )(rint))/(rint? t ) rext = 570, thus, choose the standard value rext = 560 saw filter in wideband video data applications, the if occupied band- width may be several mhz wide. a good rule of thumb is to choose the if frequency about 10 or more times greater than the if occupied bandwidth. the if bandpass filter is a saw filter in video data applications where a very selective response is needed (i.e., very sharp bandpass response). the evaluation pcb is laid out to accommodate two saw filter package types: 1) a fiveleaded plastic sip package. recommended part numbers are siemens x6950m which operates at 70 mhz; 10.4 mhz 3 db passband, x6951m (x252.8) which operates at 70 mhz; 9.2 mhz 3 db passband; and x6958m which operates at 70 mhz, 6.3 mhz 3 db pass- band, and 2) a fourleaded to39 metal can package. typical insertion loss in a wide bandpass saw filter is 25 db. the above saw filters require source and load impedances of 50 to assure stable operation. on the pc board layout, space is provided to add a matching network, such as a 1:4 surface mount transformer between the saw filter output and the input to the ML13155. a 1:4 transformer, made by coilcraft and mini circuits, provides a suitable interface (see figures 16, 17 and 18). in the circuit and layout, the saw fil- ter and the ML13155 are differentially configured with inter- connect traces which are equal in length and symmetrical. this balanced feed enhances rf stability, phase linearity, and noise performance.
www.lansdale.com page 12 of 16 issue a ML13155 lansdale semiconductor, inc. decouple rssi rssi buffer 10p 1.0k 1.0k 8.0k 8.0k bias bias v cc 1 lim out quad coil lim out v cc 2 det out v ee 2 v ee 1 input input 1.6k 1.6k 2.0p 2.0p 1.0p 15 2 13 12 3 10 9 8 7 6 11 14 1 16 figure 15. figure 15. simplified internal circuit schematic
www.lansdale.com page 13 of 16 issue a ML13155 lansdale semiconductor, inc. figure 16. 70 mhz video receiver application circuit l coilcraft part number 146?8j08s l 0.22 20p 560 v ee 2 10n 100p 10n 2.0p 2.0p 1.0k 1.0k 33p 33p detector output 100n 100n 100p quad2 limo2 v ee 2 rssi rssi buffer v ee 1 dec2 in2 9 10 11 12 13 14 15 16 8 7 6 5 4 3 2 1 quad1 limo1 v cc 2 deto2 deto1 v cc 1 dec1 in1 ML13155 saw filter + v ee 1 10n 1.0n 820 820 1.0n 1.0n 820 820 100n 47k 10k 10n rssi output 100p 100p quad2 limo2 v ee 2 rssi rssi buffer v ee 1 dec2 in2 9 10 11 12 13 14 15 16 8 7 6 5 4 3 2 1 quad1 limo1 v cc 2 deto2 deto1 v cc 1 dec1 in1 ML13155 1.0n 1.0n 220 1:4 saw filter is siemens part number x6950m 4 5 2 3 1 if input 10 + 10
www.lansdale.com page 14 of 16 issue a ML13155 lansdale semiconductor, inc. figure 17. component placement (circuit side) figure 18. component placement (ground side) legacy applications information
www.lansdale.com page 15 of 16 issue a ML13155 lansdale semiconductor, inc. figure 19. circuit side view 4.0" figure 20. ground side view 4.0" legacy applications information
www.lansdale.com page 16 of 16 issue a ML13155 lansdale semiconductor, inc. outline dimensions so?6 = -5p plastic package (ML13155-5p) case 751b (so?6) min min max max millimeters inches dim a b c d f g j k m p r 9.80 3.80 1.35 0.35 0.40 0.19 0.10 0 5.80 0.25 10.00 4.00 1.75 0.49 1.25 0.25 0.25 7 6.20 0.50 0.386 0.150 0.054 0.014 0.016 0.008 0.004 0 0.229 0.010 0.393 0.157 0.068 0.019 0.049 0.009 0.009 7 0.244 0.019 1.27 bsc 0.050 bsc notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. 751b?3 is obsolete, new standard 751b?4. 1 8 9 16 ? ? p 16 pl d ? k c g m r x 45 f j 8 pl seating plane 0.25 (0.010) t b a m s s 0.25 (0.010) b m m lansdale semiconductor reserves the right to make changes without further notice to any products herein to improve reliabili- ty, function or design. lansdale does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. ?ypical parameters which may be provided in lansdale data sheets and/or specifications can vary in different applications, and actual performance may vary over time. all operating parameters, including ?ypicals must be validated for each customer application by the customers technical experts. lansdale semiconductor is a registered trademark of lansdale semiconductor, inc.

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