EVAL-ADG798EB1Z Datasheet EVAL-ADG798EB1Z | P4-P6

UG-1039 EVAL-ADG798EB1Z User Guide

Rev. 0 | Page 4 of 9

EVALUATION BOARD HARDWARE

Evaluate the operation of the ADG798 using the EVAL-

ADG798EB1Z. Figure 1 shows a typical evaluation setup where

only a power supply and signal generator are required. Figure 2

shows the block diagram of the main components of the

evaluation board.

Using the EVAL-ADG798EB1Z evaluation board, the ADG798

passes signals from either the source or drain connectors.

POWER SUPPLY

Connector J10 provides access to the supply pins of the ADG798.

VDD, GND, and VSS on J10 link to the appropriate pins on the

ADG798. For dual-supply voltages, the evaluation board can be

terminals must be connected together, and the evaluation board

must be powered with a 3.3 V to 5.5 V voltage range. Use the

J10 header to supply the voltage that controls the digital logic

voltage level (VL).

INPUT SIGNALS

Headers connect to both the source pins and the drain pins of

the ADG798. Additional subminiature Version B (SMB) connector

pads are available if extra connections are required.

Each trace on the source and drain side includes two sets of

0805 pads, which can be used to place a load on the signal path

to ground. A 0 Ω resistor is placed in the signal path and can be

replaced with a user defined value. The resistor, combined with

the 0805 pads, creates a simple resistor-capacitor (RC) filter.

The ADG798 uses a parallel interface to control the operation of

the switches. The switch operation can be manually controlled

using the LK1 to LK4 switches, or an external controller can be

interfaced directly to the control pins by using the SMB connector

pads, if required (EN, A0, A1, and A2). See Table 1 for the logic

control truth table.

BOARD CONSTRUCTION

The entire board assembly uses high temperature rated

components, including passives, connectors, printed circuit

board (PCB) material, and solder material. A polyimide PCB

laminate is used due to its very high glass transition temperature

), which allows the board to maintain integrity at high

temperature when standard laminate typically deteriorates.

Sn90Sb10, Pb-free solder is used due to its high melting point

(245°C to 250°C). NiAu surface finish (plating) is used on the

PCB to avoid intermetallic formation between the tin in the

solder with copper PCB traces at high temperatures. The

resistors, capacitors, and connectors used are rated for extended

temperature by their respective manufacturers. For more details

on the board construction, see the bill of materials in Table 3.

EVAL-ADG798EB1Z User Guide UG-1039

Rev. 0 | Page 5 of 9

JUMPER SETTINGS

SWITCHES AND 0 Ω RESISTORS

Links are used to control the ADG798 manually. Table 2 shows

a summary of the links.

Use LK2 to LK4 to control the switches of the ADG798.

Position L is tied to GND and sets the logic low, and Position H

is tied to VL and sets the logic high.

Use LK1 to enable or disable the device. Position L is tied to

GND and disables the device, and Position H is tied to VL and

enables the device.

SMB CONNECTORS

The parallel interface of the ADG798 is controlled manually

using the link headers of LK1 to LK4. The parallel interface can

also be accessed using the SMB footprints: EN, A0, A1, and A2.

Note that these footprints are unpopulated.

DECOUPLING CAPACITORS

The board comes with 0.1 μF decoupling capacitors populated

on both the VDD and VSS power supplies. This provides sufficient

decoupling for the ADG798. However, if extra decoupling is

required due to a particular reason, such as a noisy power supply,

use C4 and C6 to add additional decoupling capacitors.

Table 1. ADG798 Truth Table

LK4 (A2) LK3 (A1) LK2 (A0) LK1 (EN) Connected Sx

X X X L All switches off

Position L Position L Position L Position H S1

Position L Position L Position H Position H S2

Position L Position H Position L Position H S3

Position L Position H Position H Position H S4

Position H Position L Position L Position H S5

Position H Position L Position H Position H S6

Position H Position H Position L Position H S7

Position H Position H Position H Position H S8

X means don’t care.

Table 2. Switch and 0 Ω Resistor Descriptions

Label Position Description

LK1 L Logic 0 on the EN pin

H Logic 1 on the EN pin

LK2 L Logic 0 on the A0 pin

H Logic 1 on the A0 pin

LK3 L Logic 0 on the A1 pin

H Logic 1 on the A1 pin

LK4 L Logic 0 on the A2 pin

H Logic 1 on the A2 pin

UG-1039 EVAL-ADG798EB1Z User Guide

Rev. 0 | Page 6 of 9

EVALUATION BOARD SCHEMATICS AND ARTWORK

14946-003

ADG798HFRZ

Figure 3. ADG798 Evaluation Board Schematic (Part 1)

P1-P3 P4-P6 P7-P9

EVAL-ADG798EB1Z

Mfr. #:

Buy EVAL-ADG798EB1Z

Manufacturer:

Analog Devices Inc.

Description:

Switch IC Development Tools evaluation board i.c.

Lifecycle:

New from this manufacturer.

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