PDF TQ9222 Data sheet ( Hoja de datos )

Número de pieza	TQ9222
Descripción	Dual-Band TDMA LNA/Downconverter IC
Fabricantes	TriQuint Semiconductor
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No Preview Available ! WIRELESS COMMUNICATIONS DIVISION LNA OUT 1900 Vdd MXR 1900 MXR LO 1900 Vdd LNA 1900 LNA IN 1900 Vdd LNA 800 LNA IN 800 MXR RF 1900 MXR IF 1900 MXR IF 800 TQ9222 DATA SHEET Dual-Band TDMA LNA/Downconverter IC LNA OUT Vdd MXR LO 800 MXR 800 800 Product Description MXR RF 800 The TQ9222 is a 3-V, RF receiver IC designed specifically for dual-band TDMA applications. Its RF performance meets the requirements of products designed to the IS-136 and GSM standards. The TQ9222 is pin compatible with TQ5121 (cellular band LNA/Mixer) which enables handset designers to use strategic board platform strategy. The TQ9222 contains two separate LNA+Mixer circuits to handle both the 800 MHz cellular band and the 1900 MHz PCS band. The mixers use a high-side LO frequency, with the IF covering a range of 70-140 MHz. IF frequencies below 120 MHz are possible due to the ½-IF spurious signal rejection in the 1900 MHz LNA+Mixer. The IF outputs are designed for use of a common IF frequency. Most RF ports are internally matched to 50Ω, greatly simplifying the design and keeping the number of external components to a minimum. Separate supply voltage connections provide the required flexibility for dual-band operation. The TQ9222 achieves good RF performance with low current consumption, supporting long standby times in portable applications. Coupled with the very small QSOP-24 package, the part is ideally suited for dual-band mobile phones. Electrical Specifications1 Parameter Gain 800 band 1900 band Typ 17.5 17.5 Units MHz MHz Noise Figure 800 band 1900 band 2.7 3.0 dB dB Input 3rd Order Intercept 800 band 1900 band -9.0 -9.0 dBm dBm DC supply Current 800 band 1900 band 10.0 22.0 mA mA Note 1: Test Conditions: Vdd=2.8V, Ta=25C, filter IL=2.5dB, RF1=881MHz, RF 2=1960MHz, LO1=991MHz, LO2= 2070MHz, IF=110MHz, LO Input=-7dBm; unless otherwise specified For additional information and latest specifications, see our website: www.triquint.com Features §Pin compatible with TQ5121 §Single 3 V operation §Low-current operation §Low-frequency IF capability §Excellent ½ IF rejection §IF output combining §50 Ω matched inputs (most ports) §QSOP-24 plastic package Applications §IS-136 dual-band Mobile Phones §Tri-Mode Phones §GSM dual-band Mobile Phones §Wireless local loop 1 1 page Application/Test circuit LNA in B V LNA B LO in B V MX B V MX A LO in A V LNA A LNA in A C6 L4 C5 R5 L3 C4 R4 R2 L2 C3 R1 C2 C1 L1 1 2 3 4 5 6 7 8 9 10 11 12 TQ9222 TQ9222 Data Sheet 24 23 22 F2 2 21 N1 1 C7 20 L6 R6 19 C8 18 C11 L5 R3 17 C10 16 2 N2 1 V IF B IF out B C9 C12 IF out A V IF A 15 F1 14 L8 13 Bill of Material for TQ9222 Receiver Application/Test Circuit Component Receiver IC Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Reference Designator U1 C1 C2, C3, C4, C5 C6 C7, C10 C9 C8, C11 C12 C13 C14, C15 (filter dependent) Part Number TQ9222 Value 1.2pF 1000pF 1.5pF .01µF 4.7pF 12pF, 10pF 8.2pF 1.5pF 0.5pF Size QSOP-24 0603 0603 0603 0603 0603 0603 0603 0603 0603 Manufacturer TriQuint Semiconductor For additional information and latest specifications, see our website: www.triquint.com 5 5 Page 10pF Mx IF Pin 14 8.2pF out 180nH Vdd 0.01uF 10Ω Note: These values assume ideal components and neglect board parasitics. The discrepancy between these values and those of the typical application circuit are the board and component parasitics TQ9222 Data Sheet that the length of the transmission line in the filter input also has an effect on Half-IF performance. 700 mils from pin to filter input Fig. 8 Suggested IF Match Half-IF Application When the intermediate frequency is less than twice the bandwidth of the receiver, Half-IF intermodulation spurs will fall within the frequency of operation. The image filter and mixer are the main circuit blocks that influence Half-IF spur suppression. However, it was shown experimentally that the preselector filter plays an important role as well in suppressing half-IF and image spurious signals. The preselector filter eliminates out of band spurs that could get amplified and degrade the performance. A narrow band pass filter and a high IF frequency are best to eliminate Half-IF problems. The other major contribution is mixer balance which is affected by two factors. First, the LO signal that leaks into the mixer inputs via parasitics. The second major contribution is the source impedance presented at the mixer RF input port. Depending on the board layout, the optimum mixer source impedance may shift which will degrade the Half-IF performance. It is possible to optimize mixer source impedance for Half-IF rejection at the LO frequency only. This will avoid affecting the desired signal to a large degree. Experience with the TQ9222, has shown that optimum mixer source impedance results in a significant mismatch causing gain reduction. Therefore, a trade- off has to be made between optimum Half-IF performance and conversion gain. The standard TQ9222 evaluation board uses a Toko TDFM1B- 1960L-11 dielectric filter in the high band. It was found that an L- network, comprised of a series 1.8 nH inductor and a shunt 1.8 pF capacitor on the mixer input, produces the best Half-IF rejection and conversion gain. To a lesser extent, it was found 23 22 1.8pF 21 1.8nH Fig. 9 Image and Half-IF circuit Note that if the final board layout is significantly different from our evaluation board, the network shown will only be useful as a guideline for development or to show what performance is possible with the TQ9222. A SAW filter will probably require a totally different type of network; and network component values vary widely between SAW filter models. Usually only a portion of the frequency band will be of concern for half-IF interference. It will depend on the injection mode of the LO signal and the IF frequency being used. For example If the LO is a high side injection such as the case of the TQ9222 and the IF = 110 MHz then (theoretically) we worry about the first 5 MHz of the band (1930-1935) only if we have ideal filters. Unfortunately most of the image stripping filters roll-off around 2000 MHz or higher hence the need to optimize performance up to 1945 MHz. The opposite occurs for low side LO. Since the frequency response of the preselector and image stripping filter help the performance at the high end of the band, the TQ9222 was tuned to give good half-IF rejection at the low end of the band over a wide temperature range (-40 °C to +85 °C). That was accomplished with a Pi-network* (between the filter output and the mixer input) comprise of a series L = 2.2 nH, shunt C = 1.0 and 0.5 pF. As expected this tuning network degraded the half-IF performance from 1970 to 1990 MHz specially at the extremes temperatures. However, once the For additional information and latest specifications, see our website: www.triquint.com 11 11 Page

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