+14dBm to +20dBm LO Buffers with ±1dB Variation
DescriptionThe MAX9989 and MAX9990 LO buffers provide the high output (+14dBm to +20dBm) necessary to drive the LO inputs of high-linearity passive mixers, while offering 40dB 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 +17dBm output power with ±1dB variation over supply, temperature, and input power. With two optional resistors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 35dB main driver output to PLL amp output isolation. Each device is offered in a 5mm x 5mm 20-pin thin QFN package with exposed paddle.
- Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drive
- Coherent Receivers
- ISM Wireless LAN
- Local Multipoint Distribution Service
- Point-to-Point Systems
- Wireless Local Loop (WLL)
|Part Number||LO Driver Outputs||PLL Driver Outputs||RF Freq.|
(mm x mm)
|MAX9989||Yes||Yes||700||1100||14.3||19.7||4.75 to 5.25||105||5.0 x 5.0|
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
- 925MHz to 2175MHz Frequency Range
- Monolithic VCO
- High Dynamic Range: -75dBm to 0dBm