AD8363ACPZ-R7 datasheet(31/36 Pages) AD

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AD8363

Rev. 0 | Page 31 of 36

Component

Function/Notes

Default Value

R1, R2, R6,

R13, R15

Output Interface (Default Configuration) in Measurement Mode. In this mode, a portion of the output

voltage is fed back to the VSET pin via R6. Using the voltage divider created by R2 and R6, the magnitude

of the slope at VOUT is increased by reducing the portion of VOUT that is fed back to VSET. If a fast

responding output is expected, the 0 Ω resistor (R15) can be removed to reduce parasitics on

the output.

R1 = 0 Ω,

R2 = open,

R6 = 0 Ω,

R13 = open,

R15 = 0 Ω

Output Interface in Controller Mode. In this mode, R6 must be open and R13 must have a 0 Ω resistor.

In controller mode, the AD8363 can control the gain of an external component. A setpoint voltage is

applied to the VSET pin, the value of which corresponds to the desired RF input signal level applied to

the AD8363. If a fast responding output is expected, the 0 Ω resistor (R15) can be removed to reduce

parasitics on the output.

C8, C9, R5

Low-Pass Filter Capacitors, CLPF. The low-pass filter capacitors reduce the noise on the output and affect the

pulse response time of the AD8363. This capacitor should be as large as possible. The smallest CLPF

capacitance should be 390 pF. R5, when set to a value other than 0 Ω, is used in conjunction with C8 and

C9 to modify the loop transfer function and change the loop dynamics in controller mode.

C8 = open,

C9 = 0.1 μF,

R5 = 0 Ω

CHPF Capacitor. The CHPF capacitor introduces a high-pass filter affect into the AD8363 transfer function

and can also affect the response time. The CHPF capacitor should be as small as possible and connect to

VPOS when used. No capacitor is needed for input frequencies greater than 10 MHz.

C3 = open

R9, R12

TCM2/PWDN. The TCM2/PWDN pin controls the amount of nonlinear intercept temperature compensation

and/or shuts down the device. The evaluation board is configured to control this from a test loop, but VREF

can also be used by the voltage divider created by R9 and R12.

R9 = open,

R12 = open

R17, R18

TCM1. TCM1 controls the temperature compensation (5 kΩ impedance). The evaluation board is configured to

control this from a test loop, but VREF can also be used by the voltage divider created by R17 and R18.

Due to the relatively low impedance of the TCM1 pin and the limited current of the VREF pin, care should

be taken when choosing the R17 and R18 values.

R17 = open,

R18 = open

Paddle

Connect the paddle to both a thermal and electrical ground.

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