数据手册：MAX2685 900MHz LNA及混频器，提供完备的前端方案，仅消耗8mA电流 .pdf [英文Rev.1(PDF,184kB)]
{状况：生产中。}
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.
产品关键特性
- 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
| 应用与使用范围
- 868MHz欧洲ISM波段
- 900MHz ISM波段应用
- 蜂窝电话/无绳电话
- 无线数据
|
典型工作电路
芯片订购型号
| 订购型号 | 产品状态 | 封装形式 | 工作温度 | RoHS/无铅 |
| MAX2685EEE | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX2685EEE+ | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX2685EEE+T | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX2685EEE-T | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
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