MAX2685
PRODUCTIONLow-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer
900MHz LNA and Mixer Offer Complete Front End Solution with only 8mA
- Part Models
- 2
- 1ku List Price
- Starting From $1.97
Part Details
- 800MHz to 1000MHz RF Frequency Range
- +2.7V to +5.5V Single-Supply Operation
- Integrated LNA + Mixer + LO Buffer
- Logic-Controlled LNA Bypass Switch Reduces Supply Current
- LNA Performance (High/Low Gain)
- Gain: +15dB/-12dB
- NF: 1.4dB/12dB
- Input IP3: -4dBm/+16dBm
- Mixer Performance (High/Low Gain)
- Gain: 6dB/4.6dB
- NF: 13dB/12dB
- Input IP3: +7dBm/-1.5dBm
- Supply Current
- 8.5mA (High Gain)
- 3.8mA (Low Gain)
- <0.1µA Supply Current in Shutdown Mode
- 0.8µs Receiver Enable Time
The MAX2685's low-noise amplifier (LNA) and downconverter mixer comprise the major blocks of an RF front-end receiver. Optimized for 900MHz operation, the device's low noise figure, high gain, and high linearity make it ideal for cellular, cordless, and wireless data applications. A low supply current of 8.5mA (high-gain mode) and 3.8mA (low-gain mode) plus a low operating supply voltage range of +2.7V to +5.5V make it suitable for use in 3-cell NiCd or 1-cell lithium-ion (Li+) battery applications. A low-power shutdown mode further extends battery life by reducing supply current below 0.1µA.
The MAX2685 includes an LNA, LNA bypass switch, downconverter mixer, and local-oscillator (LO) buffer. The LNA has a low noise figure of 1.4dB, a high gain of 15dB, and an input third-order intercept point (IP3) of -4dBm. The mixer has a noise figure of 13dB, a gain of 6dB, and an input IP3 of +7dBm. In addition, an LNA bypass switch allows two levels of gain, reducing power consumption when high gain is not needed.
The downconverter mixer has a single-ended RF input port and differential IF output ports. Differential operation of the IF ports offers improved even-order harmonic rejection and increased immunity to noise. An LO buffer allows the LO port to be driven with only -8dBm of LO power. The MAX2685 is offered in a space-saving 16-pin QSOP package.
Applications
- 868MHz European ISM Band
- 900MHz ISM-Band Applications
- Cell Phones/Cordless Phones
- Wireless Data
Documentation
Data Sheet 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX2685EEE+ | 16-QSOP-150_MIL | ||
| MAX2685EEE+T | 16-QSOP-150_MIL |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 24, 2019 - 1746N ASSEMBLY |
||
| MAX2685EEE+ | PRODUCTION | |
| MAX2685EEE+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| I/Q Downconverters/Receivers 3 | ||
| MAX2680 | PRODUCTION | 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers |
| MAX2681 | PRODUCTION | 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers |
| MAX2682 | PRODUCTION | 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers |
| Low Noise Amplifiers 2 | ||
| MAX2640 | PRODUCTION | 300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers |
| MAX2641 | PRODUCTION | 300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers |
Evaluation Kits
Evaluation Kit for the MAX2685
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