2.7GHz, 60dB mean-squared power detector responds in 500ns

Milpitas, Calif.—Linear Technology has developed a wide dynamic range mean-squared RF detector that it claims sets a new level of accuracy and speed performance.

The LT5570 provides accurate RMS (Root-Mean-Squared) power measurement of a 40MHz to 2.7GHz AC signal over 60dB dynamic range, even with a modulation crest-factor of up to 12 dB. It offers measurement accuracy of ± 0.5dB over its full dynamic range and over a temperature range of -40°C to +85°C. The LT5570 allows fast response with a full-scale rise time of 500 ns.

True power measurement is increasingly important for all types of wireless systems, as the limited wireless frequency spectrum forces the adoption of increasingly high modulation to support higher data rates for 4G cellular technology. RMS is a critical metric for accurate measurements to optimize wireless system performance.

The LT5570 provides a DC output proportional to the RMS value of the input signal power. Even if the input waveform has high crest-factor content, such as a 4-carrier W-CDMA modulated waveform, its RMS conformance accuracy is typically within 0.2 dB, compared to that of a CW (continuous waveform) power. The device offers 61 dB dynamic range at 880MHz, and 51 dB at 2.14GHz. Its linear DC output is proportional to the input power in dBm with a scaling factor of 36.5 mV/dB, typical.

Minimum sensitivity is -53 dBm at 880MHz, and -43 dBm at 2.14GHz. The device offers exceptional linearity, deviating less than + 0.5 dB from the ideal log-linear straight line, and over the device's operating temperature extremes.

The LT5570 operates from a single 5V supply, drawing a quiescent supply current of 26.5 mA. A shutdown feature is provided, reducing supply current to 0.1-µA.

The device comes in a 10-lead 3mm x 3mm DFN surface mount package.

Pricing: Starts at $5.75 each in 1,000 piece quantities.
Availability: Immediately from stock.
Datasheet: click here.

Linear Technology, 1-408-432-1900,

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