AD8310

Rev. F | Page 21 of 24

Table 6. Evaluation Board Setup Options

Component

Function

Default Condition

TP1, TP2

Supply and Ground Vector Pins.

Not applicable

SW1

Device Enable. When in Position A, the ENBL pin is connected to +VS, and the AD8310 is in normal

operating mode. When in Position B, the ENBL pin is connected to ground, putting the device into

sleep mode.

SW1 = A

R1/R4

SMA Connector Grounds. Connects common of INHI and INLO SMA connectors to ground. They

can be used to isolate the generator ground from the evaluation board ground. See Figure 28.

R1 = R4 = 0 Ω

C1, C2, R3

Input Interface. R3 (52.3 Ω) combines with the AD8310’s 1 kΩ input impedance to give an overall

broadband input impedance of 50 Ω. C1, C2, and the AD8310’s input impedance combine to set a

high-pass input corner of 32 kHz. Alternatively, R3, C1, and C2 can be replaced by an inductor and

matching capacitors to form an input matching network. See the Input Matching section for details.

R3 = 52.3 Ω,

C1 = C2 = 0.01 μF

C3

RSSI (Video) Bandwidth Adjust. The addition of C3 (farads) lowers the RSSI bandwidth of the

AD8310’s output according to the following equation:

CFILT = 1/(2π × 3 kΩ Video Bandwidth) − 2.1 pF

C3 = open

C4, C5, R5

Supply Decoupling. The normal supply decoupling of 0.01 μF (C4) can be augmented by a larger

capacitor in C5. An inductor or small resistor can be placed in R5 for additional decoupling.

C4 = 0.01 μF,

C5 = open, R5 = 0 Ω

R6

Output Source Impedance. In cable-driving applications, a resistor (typically 50 Ω or 75 Ω) can be

placed in R6 to give the circuit a back-terminated output impedance.

R6 = 0 Ω

W1, W2, C6, R7

Output Loading. Resistors and capacitors can be placed in C6 and R7 to load-test VOUT. Jumper W1

and Jumper W2 are used to connect or disconnect the loads.

C6 = R7 = open,

W1 = W2 = installed

C7

Offset Compensation Loop. A capacitor in C7 reduces the corner frequency of the offset control

loop in low frequency applications.

C7 = open