EVAL-AD7195-ASDZ Hardware Guide

Set-up Procedures

After following the instructions in the Software Procedures section, set up the evaluation and SDP boards as detailed in this section.

Warning

The evaluation software and drivers must be installed before connecting the EVAL-AD7195-ASDZ evaluation board and EVAL-SDP-CB1Z board to the USB port of the PC to ensure the PC correctly recognizes the evaluation system.

• Connect the EVAL-AD7195-ASDZ to the controller board

  • Option A: Connect the EVAL-AD7195-ASDZ to the EVAL-SDP-CK1Z

    • Using the 120 pin connector

      • Screw the two boards together using the plastic screw-washer set included in the evaluation board kit to ensure that the boards are connected firmly together.

      • Using the Arduino Connectors

• Option B: Connect the EVAL-AD7195-ASDZ to the EVAL-SDP-CB1Z

  • Using the 120 pin connector

    • Screw the two boards together using the plastic screw-washer set included in the evaluation board kit to ensure that the boards are connected firmly together.

Block Diagram

Hardware Link Options

Link Numbers	Colour	Default Position	Description
JP1	Black	A	Used for stacking of Eval boards. To select Eval board(CS_N): Pos A(1-2): selects eval board 1 (CS_ARD_1) Pos B(2-3): selects eval board 2 (CS_ARD_2)
JP2	Black	C	AVDD voltage select: Pos A: sets AVDD to 3.3v LDO supply Pos B: sets AVDD to external source Pos C: sets AVDD to 5V LDO Supply
JP3	Black	A	IOVDD voltage select: Pos A: sets IOVDD to 3.3v LDO supply Pos B: sets IOVDD to external source
JP4	Black	Uninserted	This link shorts AIN1 to AIN2. This is useful to perform noise tests on the AD7195
JP5	Black	A	DVDD voltage select: Pos A: DVDD is connected to 3.3V Pos B: DVDD is connected to AVDD
P15	Black	Uninserted	Used as external AVDD voltage connector for scp boards
P16	Black	Uninserted	Used as external IOVDD voltage connector for scp boards

On Board Connections

Bridge Connections

Connector P9: DC (Analog Input)

Functionality:

• Bridge Connection

Connection	Function
1	Ground/Sheild
2	Excitation+
3	External Reference +
4	AIN 3 with DC filtering
5	AIN 4 with DC filtering
6	External Reference -
7	BPDSW
8	Excitation-

Link JP4: Low Noise Test Circuitry

Functionality:

• Low Noise Test

-ALL INSERTED

Connection	Function
1-2	AVDD
3-4	AIN1
5-6	AIN2
7-8	AINCOM

External Powers

Connector	Function
P14 Pin 1-2	External IOVDD connection
P14 Pin 3-4	External AVDD connection
P15	External AVDD connection for SCP Boards
P16	External IOVDD connection for SCP Boards

Digital Connectors

SDP 120 Pin Connector P1	Function	Arduino connector P2,P3,P5,P6
3,4	GND	P3-6,P3-7
5	V_USB	P3-5
6,11,17,23,28,36,40,46,52	GND	P5-7
56	EEPROM_A0
58,63,69,75	GND
78	SYNC_IN	P6-5
79	SCL	P6-10
80	SDA	P6-9
81	GND
82	SCLK	P6-6
83	SDO/miso	P6-5
84	SDI/mosi	P6-4
85	CS_N	P5-3,P5-2
86,93,98,109,115	GND
116	VIO	P3-2
117,118	GND

Pmod Connector P8

Connection	Function	Connection	Function
1	CS_N	7
2	DIN	8
3	DOUT	9
4	SCLK	10
5	GND	11	GND
6	IOVDD	12	IOVDD

SMB Connections

There are 3 SMB connections on the board. To allow clock signals and reference into the board.

• J1 Provides option for External Reference+

• J2 Provides option for External Reference-

• J3 Brings external MCLK to the AD7195

Power Supplies

The evaluation board receives power through the controller board when connected to the PC via USB. Linear regulators generate the required power supply levels from the applied USB voltage.

AVDD (JP2) selection

• 5V supply (DEFAULT)

  • 5V regulator supplies AVDD ADP7142

• 3.3V supply

  • 3.3V regulator supplies AVDD ADP150

• External AVDD

  • Connections on Connector P14

DVDD (JP5) selection

• 3.3V supply (DEFAULT)

  • 3.3V supplies DVDD

• AVDD

  • AVDD connected to DVDD

IOVDD (JP3) selection

• 3.3V supply (DEFAULT)

  • 3.3V regulator supplies IOVDD ADP150

• External IOVDD

  • Connections on Connector P14

• V_IO from SDP

  • R38 to be mounted

Serial Interface

There are four primary signals: CS, SCLK, SDI, and SDO/RDY (all are inputs, except for SDO/RDY, which is an output).

Serial communication options

• SDP-B board and the respective 120 pin SDP connector.

• When using the SDP-B connection (120 pin) The evaluation board connects via the serial peripheral interface (SPI) to the Blackfin® ADSP-BF527 on the SDP-B board.

  • Arduino connection SDP-K1

  • Pmod connector

  • Standalone mode

Reference Options

• DEFAULT ADR4525 On Board external reference on REFIN1+

• LTC6655LN-2.5/LTC6655LN-4.096 On Board external reference on REFIN+

  • Option to use ultra low noise reference

• External Reference on REFIN1+ Connector J1

• AVDD as Reference via R25

Design and Integration Files

Schematics, layout files, and bill of materials are available on the EVAL-AD7195ASDZ product page.