Published:2011/5/11 4:30:00 Author:Sharon | Keyword: Monolithic, RF Power Measurement, Typical Application | From:SeekIC
LTC5507 typical application circuit is shown in the figure. C1 is the RF input coupling capacitor, and C2 is the peak holding capacitor, both of which are ceramic capacitors and have less than 5Ω capacitance to reduce the ripple. C1 and C2's capacity depends on the minimum RF input frequency fmin (units of MHz), whose formula is: C1 = C21 ≥ (30fmin). Here, both C1 and C2's unit is μF. Considering the value of C2 will affect the conversion rate and bandwidth, generally C1 = C2. However, the capacity of C1 and C2 can not be set too big, otherwise it will exceed the minimum RF input frequency. Proper selection of the capacity of C1 and C2 can increase the conversion rate and the highest RF frequency AC characteristics. R3 is a pull-up resistor. When the SHDN is not floating, LTC5507 states in normal mode; when SHDN is grounded, LTC5507 turns to low-power consumption mode.
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