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MAX2422EAI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX2422EAI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 14 page 900MHz Image-Reject Transceivers _______________________________________________________________________________________ 9 Pin Description (continued) Ground Connection for VCO and Phase Shifters 26 GND Ground (substrate) 27 GND Ground Connection for Master Bias Cell 28 GND Supply-Voltage Input for VCO and Phase Shifters. Bypass with a 47pF low-inductance capacitor to GND (pin 26 if possible). 23 VCC Supply-Voltage Input for Prescaler. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND (pin 20 if possible). 22 VCC FUNCTION PIN NAME Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using an external oscillator. 25 Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using an external oscillator. 24 TANK TANK VCC VCC VCC 17 16 15 18 19 21 1000pF TRANSMIT IF INPUT (330 Ω) VARACTOR: ALPHA SMV1299-004 OR EQUIVALENT RECEIVE IF OUTPUT (330 Ω) SEE APPLICATIONS INFORMATION SECTION L3: COILCRAFT 0805HS-060TJBC COILCRAFT 0805HS-030TJBC 27 23 26 3 12 20 22 1 28 RECEIVE RF INPUT TRANSMIT RF OUTPUT 5 9 7 6 0.01 µF 0.01 µF 47pF VCC VCC 0.1 µF VCC VCC 2 47pF 0.1 µF 8.2nH 12nH 22nH 18nH 47pF 47pF 47pF 8 11 0.01 µF 47pF 0.01 µF MAX2420 MAX2421 MAX2422 MAX2460 MAX2463 6.8 3.3 3.3 6.8 6.8 L3 (nH) PART VCO TANK COMPONENTS FOR 915MHz TYPICAL RF C26 (pF) C2, C3 (pF) 1.8 3.6 3.0 1.5 2.4 3.3 4.0 4.0 4.0 4.7 R6, R7 ( Ω) 10 15 20 15 15 47pF 47pF 14 0.01 µF 47pF RXIN TXOUT GND VCC VCC GND CAP2 GND CAP1 VCC VCC TXON RXON VCOON DIV1 MOD PREOUT TXON RXON VCOON DIV1 MOD TO PLL GND RXOUT TXIN 100nH GND PREGND 47pF VCC 24 25 VCO ADJUST C3 1k Ω 47k Ω 47pF 1k Ω C2 R6 R7 VCC L3 C26 TANK TXGAIN LNAGAIN TXGAIN LNAGAIN 10 4 MAX2420 MAX2421 MAX2422 MAX2460 MAX2463 TANK Figure 1. Typical Operating Circuit |
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