Differences

This shows you the differences between two versions of the page.

--- resources:eval:adr1399h-ebz [29 Oct 2021 01:11] – minor update to text Paul Blanchard
+++ resources:eval:adr1399h-ebz [23 Nov 2021 00:58] (current) – [Features] Paul Blanchard
@@ Line 19: / Line 19: @@
 **GENERAL DESCRIPTION** \\
 The ADR1399H-EBZ allows the evaluation of the ADR1399KHZ, ultra-stable 7.05V Shunt Voltage Reference in 4-lead TO-46 package.
-The 4-layer board has had ground layers cut away under the DUT, ensuring high thermal insulation of the heated DUT.  In the DUT area, only the bottom layer has a ground plane, and it is mesh rather than solid.
+The DUT is elevated on its leads in order to increase the thermal isolation from the 4-layer board ground planes.
 Isolated power means that the Reference output is effectively floated, removing the likelihood of ground loops.  The isolation is bridged only by a 1Meg resistor.   Power may be supplied via the USB-C cable, or 5V may be applied to “VUSB”, or power may be back driven onto the regulator outputs at “VPRE” or V+”.
 The ultra-stable 7.05V is brought out to both banana jacks and to an edge mounted SMA connector.
@@ Line 30: / Line 32: @@
 Figure 1. ADR1399H-EBZ, Primary Side
-TABLE OF CONTENTS
-Features	1
-Evaluation Kit Contents	1
-Equipment Needed	1
-General Description	1
-Evaluation Board Photograph	1
-Revision History	2
-Evaluation Board Quick Start Procedures	3
-Power Supply Consideration	3
-Initial Board Configuration	3
-Using the Evaluation Board for Testing	3
-Evaluation Board Schematic and Artwork	4
-Ordering Information	6
-Bill of Materials	6
-REVISION HISTORY
-/2021—Revision 0.1: Initial Version
-/2021—Revision 0.3: Corrections to Headers by CS
-/2021—Revision 0.4: Edits and Additional content by GB
 EVALUATION BOARD QUICK START PROCEDURES
-The following sections outline the basic prepopulated configuration of the ADR1399H-EBZ required to test the basic functionality of the device.
+The following sections outline the basic prepopulated configuration of the ADR1399H-EBZ required to test the basic functionality of the device. \\
-POWER SUPPLY CONSIDERATION
+\\
-Use a USB-C charger or other USB-C source to power the board.  You should see a Green LED.  Alternately, 5V can be applied between VUSB and DGND from a bench supply. This will power the isolating LMT8048 module, providing isolated power downstream.  Alternately, the downstream regulators can be back driven at VPRE/AGND (Max 20V) or at V+/AGND (Max 16V).  AGND is the Reference ground, so this approach is not isolated.
+POWER SUPPLY CONSIDERATION\\
-INITIAL BOARD CONFIGURATION
+Use a USB-C charger or other USB-C source to power the board.  You should see a Green LED.  Alternately, 5V can be applied between VUSB and DGND from a bench supply. This will power the isolating LMT8048 module, providing isolated power downstream.  Alternately, the downstream regulators can be back driven at VPRE/AGND (Max 20V) or at V+/AGND (Max 16V).  AGND is the Reference ground, so this approach is not isolated.  \\
-The ADR1399H-EBZ comes pre-configured.  There are no jumpers or other settings.  Just power the board using (only) one of the methods described above, and begin watching the 7.05V output at either the SMA output or the Banana jacks (or both).  For the best investigation, you will need a 6-digit or higher meter, such as HP3458 or Keithley 2001/2 or equivalent.
+\\
+INITIAL BOARD CONFIGURATION\\
-USING THE EVALUATION BOARD FOR TESTING
+The ADR1399H-EBZ comes pre-configured.  There are no jumpers or other settings.  Just power the board using (only) one of the methods described above, and begin watching the 7.05V output at either the SMA output or the Banana jacks (or both).  For the best investigation, you will need a 6-digit or higher meter, such as HP3458 or Keithley 2001/2 or equivalent.\\
-The board was designed along the lines of a simple “pocket calibrator”, so alternate means of supplying the DUT were not thoroughly provided for.  For example, the Heater- is directly grounded, so there is no means of providing a negative 15V supply to Heater- for an overall 30V heater supply.
+ \\
+USING THE EVALUATION BOARD FOR TESTING\\
+The board was designed along the lines of a simple “pocket calibrator”, so alternate means of supplying the DUT were not thoroughly provided for.  For example, the Heater- is directly grounded, so there is no means of providing a negative 15V supply to Heater- for an overall 30V heater supply.\\
-The board is very easy to use.  Just power the board using one of the methods discussed, and start measuring the output DC voltage.  If you measure the supply current, you should see an initial fairly high current as the heater brings the ADR1399 to temperature (approx. 95C).  The ADR1399 has an internal current limit of about 100mA, but the on board LT3045’s have been configured to limit available current to 75mA.  After losses and transformer, this limits the 5V USB input current to about 250mA.
+The board is very easy to use.  Just power the board using one of the methods discussed, and start measuring the output DC voltage.  If you measure the supply current, you should see an initial fairly high current as the heater brings the ADR1399 to temperature (approx. 95C).  The ADR1399 has an internal current limit of about 100mA, but the on board LT3045’s have been configured to limit available current to 75mA.  After losses and transformer, this limits the 5V USB input current to about 250mA. \\
+ \\
 EVALUATION BOARD SCHEMATIC AND ARTWORK \\
 {{:resources:eval:adr1399a.png?400|ADR1399H}}
-Figure 5. ADR1999H-EBZ Schematic, DUT Section\\
+Figure 5. ADR1399H-EBZ Schematic, DUT Section\\
 {{:resources:eval:adr1399b.png?400|ADR1399H}}
@@ Line 99: / Line 80: @@
 ©2019 Analog Devices, Inc. All rights reserved. Trademarks and
  registered trademarks are the property of their respective owners.
- 	UG22920-0-12/19(0)

Wiki

Analog Devices Wiki

Differences

Analog Devices Wiki

Differences

Page Tools