LT5537 Wide Dynamic Range RF/IF Log Detector UFEATURESDESCRIPTIO ■ Low Frequency to 1000MHz Operation The LT®5537 is a wide dynamic range RF/IF detector, ■ 83dB Dynamic Range with ± 1dB Nonlinearity operational from below 10MHz to 1000MHz. The lower at 200MHz limit of the operating frequency range can be extended to ■ Sensitivity –76dBm or Better at 200MHz near DC by the use of an external capacitor. The input ■ Log-Linear Transfer Slope of 20mV/dB dynamic range at 200MHz with ±3dB nonlinearity is 90dB ■ Supply Voltage Range: 2.7V to 5.25V (from –76dBm to 14dBm, single-ended 50Ω input). The ■ Supply Current: 13.5mA at 3V detector output voltage slope is nominally 20mV/dB, and ■ Tiny 8-Lead (3mm × 2mm) DFN Package the typical temperature coefficient is 0.01dB/°C at 200MHz. U , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. APPLICATIO S ■ Linear-to-Log Signal Level Conversion ■ Received Signal Strength Indication (RSSI) ■ RF Power Control ■ RF/IF Power Detection ■ Receiver RF/IF Gain Control ■ Envelope Detection ■ ASK Receiver UTYPICAL APPLICATIO OPTIONAL 4 5 Output Voltage, Linearity Error 7k CAP+ CAP– vs Input Power at 200MHz 7k 2.4 3 OFFSET VCC 6 2.0 2 CANCELLATION 15nF 85°C LINEARITY ERROR (dB) 1nF 1µF RF IN IN+ 25°C 2 1.6 1 15nF IN– (V) –40°C 1.2 0 3 OUTV 0.8 –1 0.4 –2 OUTPUT OUT DETECTOR CELLS 8 BUFFER V 7.2k CC = ENBL = 3V 0 –3 VEE –80 –60 –40 –20 0 20 7 ENBL BANDGAP REFERENCE INPUT POWER (dBm) 1 AND BIASING 5537 TA01b EXPOSED PAD 9 5537 TA01a 5537fa 1
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