Evaluation Board Schematics/Pcb Layout; Basic Hardware Setup - Analog Devices EVAL-ADAS3022EDZ User Manual

EVAL-ADAS3022EDZ User Guide
POWER SUPPLIES AND GROUNDING
The on-board ADP3334 low dropout regulators are provided
for 2.5 V, 3.3 V, and 5 V and also for the FPGA I/O supply
which is user configurable and set to 3.3 V by default. The
FPGA core is supplied by a pair of
1.2 V. Additional power is supplies via the CED board for an
alternative +5 V analog and digital 3.3 V/5 V digital through P4.
The ADAS3022 device also requires ±15 V supplies for
VDDH and VSSH. These must be supplied by the user using
a standard lab supply ensuring that the return paths are at the
same potential. Refer to CN-0201
on generating these ±15 V supplies from a +5 V single supply.
The differential input common-mode voltage (VCM) range
changes according to the maximum input range selected and
the high voltage power supplies (VDDH and VSSH). In other
words, the specified operating input voltage of any input pin
requires 2.5 V of headroom from the VDDH and VSSH
supplies.
The evaluation board ground plane consists of a solid plane
on one PCB layer shared on another layer with the power plane.
To attain high resolution performance, the board was designed
to ensure that all digital ground return paths do not cross the
analog ground return paths, that is, all analog on one side and
digital on the other.

EVALUATION BOARD SCHEMATICS/PCB LAYOUT

The evaluation board is a 6-layer board carefully laid out and
tested to demonstrate the specific high accuracy performance
SIGNAL SOURCE
ADP1715 devices set for
for the complete information
EVAL-ADAS3022EDZ
Figure 3. Hardware Configuration—Setting up the
Rev. A | Page 5 of 32
of the ADAS3022 devices. The Evaluation Board Schematics
and Artwork section of this user guide shows the schematics of
the evaluation board.

BASIC HARDWARE SETUP

The ADAS3022 evaluation board connects to the
converter evaluation and demonstration board. The
CED1Z board is the controller board, which is the communi-
cation link between the PC and the main evaluation board.
Figure 3 shows a photograph of the connections made between
the ADAS3022 daughter board and the
1. Before connecting power, ensure that the
ADAS3022EDZ and the
connected firmly together.
2. Connect the power supplies on the
board. The EVAL-ADAS3022EDZ
supplies of ±15 V. Connect them from a bench top power
supply.
3. Connect the EVAL-CED1Z
cable enclosed in the EVAL-SDPCB1Z kit. If using a
Windows® XP platform, you may need to search for the
EVAL-CED1Z drivers. Choose to automatically search for
the drivers for the EVAL-CED1Z
operating system.
4. Proceed to the Software Installation section to install the
software. Note that the EVAL-CED1Z
be connected to the PC's USB port until the software is
installed. The 7 V dc supply can be connected, however,
to check that the board has power (green LED lit).
EVAL-CED1Z
EVAL-ADAS3022EDZ
UG-484
EVAL-CED1Z
EVAL-
EVAL-CED1Z board.
EVAL-
EVAL-CED1Z boards are
EVAL-ADAS3022EDZ
requires external power
board to the PC via the USB
board if prompted by the
board must not
PC
USB
TO WALL WART