LTC5535 Precision 600MHz to 7GHz, RF Detector with Adjustable Gain and 12MHz Baseband Bandwidth UFEATURESDESCRIPTIO ■ Temperature Compensated Internal Schottky The LTC®5535 is an RF power detector for RF applications Diode RF Detector operating in the 600MHz to 7GHz range. A temperature ■ Wide Input Frequency Range: 600MHz to 7GHz* compensated Schottky diode peak detector and output ■ Wide Input Power Range: –32dBm to 10dBm amplifier are combined in a small ThinSOTTM package. The ■ External Gain Control supply voltage range is optimized for operation from a ■ Precision VOUT Offset Control single cell lithium-ion or three cell NiMH battery. ■ Low Starting Voltage: 200mV for Gain = 2 The RF input voltage is peak detected using an on-chip ■ Wide VCC Range of 2.7V to 5.5V Schottky diode. The detected voltage is buffered and ■ Low Operating Current: 2mA supplied to the V ■ Available in a Low Profile (1mm) SOT-23 Package OUT pin. U The LTC5535 output amplifier gain is set via external APPLICATIO S resistors. The initial starting voltage of 200mV can be precisely adjusted using the VOS pin. ■ 802.11a, 802.11b, 802.11g, 802.15, 802.16 The LTC5535 operates with input power levels from ■ Multimode Mobile Phone Products –32dBm to 10dBm. The 12MHz baseband bandwidth is ■ Optical Data Links much higher than that of previous Schottky detector ■ Wireless Data Modems products. ■ Wireless and Cable Infrastructure ■ RF Power Alarm , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. ■ Envelope Detector *Higher frequency operation is achievable with reduced performance. Consult factory for more information. UTYPICAL APPLICATIOOutput Voltage vs RF Input Power 3600 600MHz to 7GHz RF Power Detector VCC = 3.6V 3200 TA = 25°C GAIN = 2 2GHz 2800 VOS = 0V 33pF LTC5535 600MHz 1 RF 6 2400 V 1GHz RF CC V IN CC INPUT 2000 5GHz 100pF 0.1µF 6GHz 2 5 1600 GND VOUT 7GHz R 1200 A OUTPUT VOLTAGE (mV) 3 4GHz V 4 OS V V OUT 800 REFERENCE OS M V 5535 TA01 RB 400 0 –32 –28 –24 –20 –16 –12 –8 –4 0 4 8 12 RF INPUT POWER (dBm) 5535 TA02 5535f 1
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