MAX9989 Datasheet | Maxim Integrated

Description The MAX9989 and MAX9990 LO buffers provide the high output (+14d Bm to +20d Bm) necessary to drive the LO inputs of high-linearity passive mixers, while offering 40d B reverse isolation to prevent LO pulling. The MAX9989 is internally matched for the cellular/GSM bands, and the MAX9990 is matched for the DCS/PCS/UMTS bands. The Typical Application Circuit provides a nominal +17d Bm output power with ±1d B variation over supply, temperature, and input power. With two optional resistors, the output power can be precision set from +14d Bm to +20d Bm. The devices offer more than 35d B main driver output to PLL amp output isolation. Each device is offered in a 5mm ✕ 5mm 20-pin thin QFN package with exposed paddle. o ±1d B Output Power Variation o +14d Bm to +20d Bm Adjustable Output Power o 40d B Reverse Isolation o Better Than 35d B Main Driver Output to PLL Amp Output Isolation o Low Output Noise: -170d Bc/Hz at +17d Bm o 110m A Supply Current at +17d Bm o ESD Protection o Isolated PLL Output (+3d Bm) Features MAX9989/MAX9990 Applications Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drives Coherent Receivers ISM Wireless LAN Wireless Local Loop Local Multipoint Distribution Service Point-to-Point Systems PART Ordering Information TEMP RANGE PINPACKAGE 20 Thin QFN-EP- FREQUENCY RANGE (MHz) 700 to 1100 MAX9989ETP -40°C to +85°C MAX9990ETP -40°C to +85°C 20 QFN-EP- 1500 to 2200 - EP = Exposed paddle. Typical Application Circuit/Pin Configuration appears at end of data sheet. Typical Operating Circuit and Block Diagram PLL BUFFER TO PLL PRESCALER OUTPLL (+3d Bm) MAX9989 MAX9990 OUTPUT AMP INPUT AMP RF INPUT IN (+7d Bm) RF LO OUTLO (+17d Bm) IF OUTPUT BIAS BIASIN BIASOUT BIAS CONTROL NETWORK ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .maxim-ic.. .. +14d Bm to +20d Bm LO Buffers...