Data Sheet

HMC856

Rev. D | Page 11 of 13

APPLICATIONS INFORMATION

EVALUATION PRINTED CIRCUIT BOARD (PCB)

The evaluation PCB of the HMC856 uses RF circuit design

techniques. Signal lines must have 50 Ω impedance whereas the

package ground leads must connect directly to the ground plane

similar to that shown in Figure 25. The exposed metal package

connect the top and bottom ground planes. The evaluation PCB

shown in Figure 24 is available from Analog Devices, Inc., upon

request. Install a jumper on the JP1 header to short VR to GND

for normal operation.

Table 4. Bill of Materials for the Evaluation PCB 127102-

HMC856LC51

Item

Description

J1 to J4

K connectors

J5

0.1 inch 2 × 5 header

J7 to J14

0.04 inch dc pin

JP1

0.1 inch 2 position header with shunt

C1, C2

4.7 μF capacitor, Case A

C3 to C5

100 pF capacitor, 0402 package

R1, R8

10 Ω resistor, 0603 package

R2

1.2 kΩ resistor, 0603 package

R3 to R7

2.7 kΩ resistor, 0603 package

U1

28 Gbps digital time delay HMC856

127100 evaluation board PCB

1

127100 is the raw bare PCB. Reference 127102-HMC856LC5 when ordering

the complete evaluation PCB.

2

Use Arlon 25FR or Rogers 4350 for circuit board material.

Figure 24. Evaluation Board Layout, Top Side