Top ±1dB Output Power Variation +14dBm to +20dBm Adjustable Output Power 40dB Reverse Isolation Better Than 35dB Main Driver Output to PLL Amp Output Isolation Low Output Noise: -170dBc/Hz at +17dBm 110mA Supply Current at +17dBm ESD Protection Isolated PLL Output (+3dBm)
±1dB Output Power Variation +14dBm to +20dBm Adjustable Output Power 40dB Reverse Isolation Better Than 35dB Main Driver Output to PLL Amp Output Isolation Low Output Noise: -170dBc/Hz at +17dBm 110mA Supply Current at +17dBm ESD Protection Isolated PLL Output (+3dBm)
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The 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.
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.
Key Features
Applications/Uses
- 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)
Parametric specs for VCO Buffers/Splitters
| LO Driver Outputs | Yes |
| PLL Driver Outputs | Yes |
| RF Freq. (MHz) (min) | 700 |
| RF Freq. (MHz) (max) | 1100 |
| POUT (dBm) (min) | 14.3 |
| POUT (dBm) (max) | 19.7 |
| VCC (V) | 4.75 to 5.25 |
| ISUPPLY (mA) | 105 |
| Footprint (mm x mm) | 5.0 x 5.0 |
| Package/Pins | TQFN/20 |
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Parameters
Parametric specs for VCO Buffers/Splitters
| LO Driver Outputs | Yes |
| PLL Driver Outputs | Yes |
| RF Freq. (MHz) (min) | 700 |
| RF Freq. (MHz) (max) | 1100 |
| POUT (dBm) (min) | 14.3 |
| POUT (dBm) (max) | 19.7 |
| VCC (V) | 4.75 to 5.25 |
| ISUPPLY (mA) | 105 |
| Footprint (mm x mm) | 5.0 x 5.0 |
| Package/Pins | TQFN/20 |
Key Features
Applications/Uses
- 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)
Description
The 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.
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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