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Analog Devices AD8342 manual

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Table of contents for the manual

  • Page 1

    Active Receive Mixer LF to 500 MHz AD8342 Rev. 0 Information furnished by Analog Devices is believed to be a ccurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor f or any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to chan ge without notice[...]

  • Page 2

    AD8342 Rev. 0 | Page 2 of 20 T ABLE OF CONTE NTS Specifications ..................................................................................... 3 AC Per fo r m a nc e ............................................................................... 4 Spur T able ...................................................................................[...]

  • Page 3

    AD8342 Rev. 0 | Page 3 of 20 SPECIFICATIONS V S = 5 V , T A = 25°C, f RF = 238 MHz, f LO = 286 MHz, L O power = 0 dBm, Z O = 50 Ω, R BI AS = 1.82 kΩ, RF termination = 100 Ω, IF t ermi- nat ed into 100 Ω thro ug h a 2:1 ratio bal un, unless other wise noted. Table 1. Parameter Conditions Min Typ Max Unit RF INPUT INTERFACE Return Loss Hi-Z [...]

  • Page 4

    AD8342 Rev. 0 | Page 4 of 20 AC PERFORMANCE V S = 5 V , T A = 25°C, LO pow er = 0 dBm, Z O = 50 Ω, R BIAS = 1.82 kΩ, RF te rmination 100 Ω, IF terminat ed into 100 Ω via a 2:1 ra tio balun, unl ess ot her w is e note d. Table 2. Parameter Conditions Min Typ Max Unit RF FREQUENCY RANGE 1 50 500 MHz LO FREQUENCY RANGE 1 High side LO 60 850 M[...]

  • Page 5

    AD8342 Rev. 0 | Page 5 of 20 SPUR TABLE V S = 5 V , T A = 25°C, RF and L O power = 0 dBm, f RF = 238MH z, f LO = 286MHz, Z O = 50 Ω, R BI AS = 1.82 kΩ, RF termination 100 Ω, IF terminat ed int o 100 Ω via a 2:1 ratio bal u n. N ote: M easured using standar d test board . T ypical noise flo or of m e asuremen t system = −100 dBm. Table 3.[...]

  • Page 6

    AD8342 Rev. 0 | Page 6 of 20 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Rating Supply Voltage, V S 5.5 V RF Input Level 12 dBm LO Input Level 12 dBm PWDN Pin V S + 0.5 V IFOP, IFOM Bias Voltage 5.5 V Minimum Resistor from EXRB to COMM 1.8 kΩ Internal Power Dissipation 650 mW θ JA 77°C/W Maximum Junction Temperature 135°C Operating Temperature[...]

  • Page 7

    AD8342 Rev. 0 | Page 7 of 20 PIN CONFIGURATION AND FU NCTION DESCRIPTIONS 05352-002 PIN 1 INDICATOR 1 VPLO 2 LOCM 3 LOIN 4 COMM 11 PWDN 12 VPDC 10 EXRB 9 COMM 5 C O M M 6 I F O M 7 I F O P 8 C O M M 1 5 R F I N 1 6 V P M X 1 4 R F C M 1 3 C O M M TOP VIEW (Not to Scale) AD8342 Figure 2. 16-L ead LFCSP Table 5. Pin Funct ion Descriptions Pin No. Mne[...]

  • Page 8

    AD8342 Rev. 0 | Page 8 of 20 TYPICAL PERFORMANCE CHARACTE RISTICS V S = 5 V , T A = 25°C, RF power = −10 dB m, LO power = 0 dB m, Z O = 50 Ω, R BI AS = 1.82 kΩ, RF terminatio n 100 Ω, IF terminat e d int o 100 Ω via a 2:1 ratio bal un, unless other wise noted. 05352-004 RF FREQUENCY (MHz) GAIN (dB) IF = 10MHz 50 550 100 150 200 250 300 3[...]

  • Page 9

    AD8342 Rev. 0 | Page 9 of 20 27 17 50 550 05352-007 RF FREQUENCY (MHz) INPUT IP3 (dBm) 100 150 200 250 300 350 400 450 500 26 25 24 23 22 21 20 19 18 IF = 10MHz IF = 140MHz IF = 90MHz IF = 48MHz Figure 9. Input IP3 vs. RF Frequency 27 17 –15 5 05352-027 LO LEVEL (dBm) INPUT IP3 (dBm) 26 25 24 23 22 21 20 19 18 –13 –11 –9 –7 –5 –3 –1[...]

  • Page 10

    AD8342 Rev. 0 | Page 10 of 20 13 3 50 550 05352-013 RF FREQUENCY (MHz) INPUT P1dB (dBm) 12 11 10 9 8 7 6 5 4 100 150 200 250 300 350 400 450 500 10MHz 140MHz 48MHz 90MHz Figure 15. Input P1dB vs. RF Fr equ ency 10.0 5.0 –15 5 05352-038 LO LEVEL (dBm) INPUT P1dB (dBm) 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 –13 –11 –9 –7 –5 –3 –1 1 3 IF [...]

  • Page 11

    AD8342 Rev. 0 | Page 11 of 20 60 0 100 550 05352-010 RF FREQUENCY (MHz) INPUT IP2 (dBm) 50 40 30 20 10 IF = 10MHz IF = 140MHz IF = 90MHz IF = 48MHz 150 200 250 300 350 400 450 500 Figur e 21. Input IP2 vs. RF F requency (S econd RF = R F - 50 MHz) 60 40 05352-029 INPUT IP2 (dBm) 58 56 54 52 50 48 46 44 42 –15 5 LO LEVEL (dBm) –13 –11 –9 –[...]

  • Page 12

    AD8342 Rev. 0 | Page 12 of 20 16 10 –15 5 05352-018 LO POWER (dBm) NF (dB) 15 14 13 12 11 –13 –11 –9 –7 –5 –3 –1 1 3 NF = 10MHz NF = 48MHz NF = 90MHz NF = 140MHz Fig ur e 27. N oi s e Fi g ur e v s. LO Powe r, f RF = 23 8 MHz 5.0 0 1.8 05352-024 R BIAS (k Ω ) GAIN (dB) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 2.0 2.2 2.4 2.6 2.8 3.0 3.[...]

  • Page 13

    AD8342 Rev. 0 | Page 13 of 20 0 –90 50 05352-021 LO FREQUENCY (MHz) LEAKAGE (dBc) –10 –20 –30 –40 –50 –60 –70 –80 250 450 650 850 Fi g u r e 3 3 . LO t o R F L e a k a g e v s . LO F r e q u e n c y, LO P o w e r = 0 d B m 0 –45 50 550 05352-035 RF FREQUENCY (MHz) FEEDTHROUGH (dBc) –5 –10 –15 –20 –25 –30 –35 –40 [...]

  • Page 14

    AD8342 Rev. 0 | Page 14 of 20 CIRCUIT DESCRIPTION The AD8342 is an active mixer optimized for o p eration wi thin the inp ut f requen c y range of n e ar dc to 500 MHz. I t has a dif- fer en t ial, hi g h im pedance RF in put that can be term inated o r mat ched externally . The RF in put can be driven either single- ended or differentially . The L[...]

  • Page 15

    AD8342 Rev. 0 | Page 15 of 20 AC INTERFACES The AD8342 is designed to downcon ver t radio frequencies (RF) to low er intermediate freq uencies (IF) using a high or lo w-side local oscil lato r (LO). The LO is injected into the mixer core a t a frequen c y higher or l ow er than the des ired in put RF . The difference between t he LO and the RF , f [...]

  • Page 16

    AD8342 Rev. 0 | Page 16 of 20 IF PORT The IF port comp rises open-col lector differential ou tpu ts. The NPN open collec tors can be modele d as current sources tha t are sh unted with resis t ances o f ~10 kΩ in parallel with capacitan c es of ~1 pF . The specified performance n umbers for the AD8342 wer e measured with 100 Ω differen tial ter[...]

  • Page 17

    AD8342 Rev. 0 | Page 17 of 20 05352-047 COMM 8 IFOP 7 IFOM 6 COMM 5 AD8342 Z L = 1 0 0 Ω I F O U T Z O = 5 0 Ω + V S 2:1 Figure 47. Biasi ng the IF Port Open- Collector Outputs Using a Center- T apped Impedance Transformer 05352-048 COMM 8 IFOP 7 IFOM 6 COMM 5 AD8342 R F C + V S R F C Z L = 1 0 0 Ω I F O U T + I F O U T – + V S Z L IMPEDANC[...]

  • Page 18

    AD8342 Rev. 0 | Page 18 of 20 HIGH IF APPLICATIONS In some a pplication s it may be desirable to use the AD8342 as an up-con verting mixer . The AD8342 is a broadband mixer capabl e of b ot h up an d dow n convers ion. Unlike othe r mi xers tha t rely on on-chip r eactive circuitry to op timize performan ce over a specific b and, the AD8342 is a ve[...]

  • Page 19

    AD8342 Rev. 0 | Page 19 of 20 EVALUATION BOARD An evalua tion board is ava i lable fo r the AD8342. The evaluation bo a rd is configured for sin g le-ended signaling at the IF out put port vi a a balun tra nsformer . The schema tic for th e evalua tion board i s presen ted in Figur e 53. R2 0 Ω R1 0 Ω C6 1000pF C4 1000pF C1 1000pF C3 1000pF C5 [...]

  • Page 20

    AD8342 Preliminary Technical Data Rev. 0 | Page 20 of 20 OUTLINE DIMENSIONS 1 0.50 BSC 0.60 MAX P I N 1 I N D I C A T O R 1.50 REF 0.50 0.40 0.30 0.25 MIN 0.45 2.75 BSC SQ TOP VIEW 12° MAX 0.80 MAX 0.65 TYP SEATING PLANE PIN 1 INDICATO R 0.90 0.85 0.80 0.30 0.23 0.18 0.05 MAX 0.02 NOM 0.20 REF 3.00 BSC SQ * 1.65 1.50 SQ 1.35 16 5 13 8 9 12 4 EXPOS[...]