AD8314 Datasheet, PDF (15/16 Pages) Analog Devices – 100 MHz-2500 MHz 45 dB RF Detector/Controller

Component
TP1, TP2
SW1
R1, R2
R3, R4, C2, R5, R6, C3
C1, R9
C4
R7, R8
LK1
AD8314
Table IV. Evaluation Boards Configuration Options
Function
Supply and Ground Vector Pins
Device Enable: When in position A, the ENBL
pin is connected to +V_S and the AD8314 is in
operating mode. In Position B, the ENBL pin is
grounded, putting the device in power-down mode.
Input Interface: The 52.3 Ω resistor in position
R2 combines with the AD8314’s internal input
impedance to give a broadband input impedance
of around 50 Ω. A reactive match can be imple-
mented by replacing R2 with an inductor and
R1 (0 Ω) with a capacitor. Note that the AD8314’s
RF input is internally ac-coupled.
Output Interface: R4, C2, R6, and C3 can be
used to check the response of V_UP and V_DN
to capacitive and resistive loading. R3/R4 and
R5/R6 can be used to reduce the slope of V_UP
and V_DN.
Power Supply Decoupling: The nominal supply
decoupling consists of a 0.1 µF capacitor (C1). A
series inductor or small resistor can be placed in
R9 for additional decoupling.
Filter Capacitor: The response time of V_UP
and V_DN can be modified by placing a capacitor
between FLTR (pin 4) and V_UP.
Slope Adjust: By installing resistors in R7 and R8,
the nominal slope of 20 mV/dB can be increased.
See Slope Adjust discussion for more details.
Measurement/Controller Mode: LK1 shorts
V_UP to VSET, placing the AD8314 in
measurement mode. Removing LK1 places
the AD8314 in controller mode.
Default Condition
Not Applicable
SW1 = A
R2 = 52.3 Ω (Size 0603)
R1 = 0 Ω (Size 0402)
R4 = C2 = R6 = C3 = Open (Size 0603)
R3 = R5 = 0 Ω (Size 0603)
C1 = 0.1 µF (Size 0603)
R9 = 0 Ω (Size 0603)
C4 = Open (Size 0603)
R7 = 0 Ω (Size 0603)
R8 = Open (Size 0603)
LK1 = Installed
REV. 0
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