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LT5525 Datasheet(PDF) 7 Page - Linear Technology |
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LT5525 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT5525 5525f TEST CIRCUITS REF DES VALUE SIZE PART NUMBER C1 — 0402 Frequency Dependent C2 0.01µF 0402 AVX 04023C103JAT C3 1.2pF 0402 AVX 04025A1R2BAT C4 100pF 0402 AVX 04025A101JAT C8 1µF 0603 Taiyo Yuden LMK107BJ105MA L2, L3 150nH 1608 Toko LL1608-FSR15J T2 4:1 SM-22 M/A-COM ETC4-1-2 Figure 1. Test Schematic IFOUT 140MHz 5526 F01 16 15 14 13 56 7 8 12 11 10 9 NC NC GND GND EN EN VCC1 VCC2 RF + RF– LO + LO– NC 17 1 2 3 4 NC NC IF + IF– RFIN 1900MHz LOIN 1760MHz 15 4 3 2 C4 L3 L2 C3 C2 C8 VCC LT5525 RF GND GND DC ER = 4.4 0.018" 0.018" 0.062" 900MHz INPUT MATCHING: C1: 3.9pF C1 OPTIONAL T2 APPLICATIO S I FOR ATIO The LT5525 consists of a double-balanced mixer, RF balun, RF buffer amplifier, high speed limiting LO buffer and bias/enable circuits. The IC has been optimized for downconverter applications with RF input signals from 0.8GHz to 2.5GHz and LO signals from 500MHz to 3GHz. With proper matching, the IF output can be operated at frequencies from 0.1MHz to 1GHz. Operation over a wider frequency range is possible, though with reduced performance. The RF, LO and IF ports are all differential, though the RF and LO ports are internally matched to 50Ω for single- ended drive. The LT5525 is characterized and production tested using single-ended RF and LO inputs. Low side or high side LO injection can be used. RF Input Port The mixer’s RF input, shown in Figure 2, consists of an integrated balun and a high linearity differential amplifier. The primary terminals of the balun are connected to the RF+ and RF– pins (Pins 2 and 3, respectively). The second- ary side of the balun is internally connected to the amplifier’s differential inputs. For single-ended operation, the RF+ pin is grounded and the RF– pin becomes the RF input. It is also possible to ground the RF– pin and drive the RF+ pin, if desired. If the RF source has a DC voltage present, then a coupling capacitor must be used in series with the RF input pin. Otherwise, excessive DC current could damage the pri- mary winding of the balun. |
Similar Part No. - LT5525_15 |
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Similar Description - LT5525_15 |
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