The ADL5902 is a true rms responding power detector that has a 60 dB measurement range when driven with a single-ended 50 Ω source. This feature makes the ADL5902 extremely frequency versatile by eliminating the need for a balun, or any other form of external input tuning, for operation up to 9 GHz.
The ADL5902 provides a solution in a variety of high frequency communication systems and in instrumentation requiring an accurate response to signal power. Requiring only a single supply of 5 V and a few capacitors, it is easy to use and capable of being driven by a single-ended or with a balun for differential input drive. The ADL5902 can operate from less than 100 MHz to over 9 GHz and can accept inputs that have rms values from 1 mV to at least 1 V, with large crest factors, exceeding the requirements for accurate measurement of WiMAX, CDMA, WCDMA, TD-SCDMA, multi-carrier GSM, and LTE signals.
The ADL5902 can determine the true power of a high frequency signal having a complex low frequency modulation envelope, or as a simple low frequency rms voltmeter. The high-pass corner generated by its internal offset-nulling loop can be lowered by a capacitor added on the CHPF pin.
Used as a power measurement device, VOUT is connected to VSET. The output is then proportional to the logarithm of the rms value of the input. In other words, the reading is presented directly in decibels and is conveniently scaled 50 mV/dB; other slopes are easily arranged. In controller modes, the voltage applied to VSET determines the power level required at the input to null the deviation from the set point. The output buffer can provide high load currents.
The ADL5902 has a typical operating current of 65 mA at 25°C. It is supplied in a 16-lead LFCSP for operation over the temperature range of −40°C to +125°C. An evaluation board is available.
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADL5902-EVALZ | 量产 | 评估板 | - | 工业 |
| ADL5902ACPZ-R2 | 量产 | LFCSP:LEADFRM CHIP SCALE | 16 | 工业 |
| ADL5902ACPZ-R7 | 量产 | LFCSP:LEADFRM CHIP SCALE | 16 | 工业 |
| ADL5902ACPZ-WP | 量产 | LFCSP:LEADFRM CHIP SCALE | 16 | 工业 |