AD8314ARM datasheet(15/16 Pages) AD

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AD8314

–15–

REV. 0

Table IV. Evaluation Boards Conﬁguration Options

Component

Function

Default Condition

TP1, TP2

Supply and Ground Vector Pins

Not Applicable

SW1

Device Enable: When in position A, the ENBL

SW1 = A

pin is connected to +VS and the AD8314 is in

operating mode. In Position B, the ENBL pin is

grounded, putting the device in power-down mode.

R1, R2

Input Interface: The 52.3

Ω resistor in position

R2 = 52.3

Ω (Size 0603)

R2 combines with the AD8314’s internal input

R1 = 0

Ω (Size 0402)

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.

R3, R4, C2, R5, R6, C3

Output Interface: R4, C2, R6, and C3 can be

R4 = C2 = R6 = C3 = Open (Size 0603)

used to check the response of V_UP and V_DN

R3 = R5 = 0

Ω (Size 0603)

to capacitive and resistive loading. R3/R4 and

R5/R6 can be used to reduce the slope of V_UP

and V_DN.

C1, R9

Power Supply Decoupling: The nominal supply

C1 = 0.1

µF (Size 0603)

decoupling consists of a 0.1

µF capacitor (C1). A

R9 = 0

Ω (Size 0603)

series inductor or small resistor can be placed in

R9 for additional decoupling.

Filter Capacitor: The response time of V_UP

C4 = Open (Size 0603)

and V_DN can be modiﬁed by placing a capacitor

between FLTR (pin 4) and V_UP.

R7, R8

Slope Adjust: By installing resistors in R7 and R8,

R7 = 0

Ω (Size 0603)

the nominal slope of 20 mV/dB can be increased.

R8 = Open (Size 0603)

See Slope Adjust discussion for more details.

LK1

Measurement/Controller Mode: LK1 shorts

LK1 = Installed

V_UP to VSET, placing the AD8314 in

measurement mode. Removing LK1 places

the AD8314 in controller mode.

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