Medical & High Reliability Forum - Recent Threads

AFE5809EVM and ultrasound probes @ 8MHz in CW mode

Enrico Urru — Fri, 17 May 2013 08:47:54 GMT

Hello, I need your help!

I want to know if it is possible to use the local oscillator internal on the AFE5809EVM card , to drive Ultrasound probes ( 8 Mhz), or if I need to use an external oscillator at 8 MHz., in CW Mode.

Then, in the User's Guide, (SLOU338A–October 2012–Revised November 2012), at page 23, paragraph 9.3, it is not clear how to set the capacitors configuration to use External Clock for CW Mode.

First, 8 capacitors are indicated (The manufacture default setup uses ON BOARD CLOCK, with which C154, C155, C156, and C157 are installed. To switch to an external clock, these four capacitors must be uninstalled and capacitors C49,C50,C52, and C53 must be installed) ,

then in the table 1 below, there are others 8 different capacitors (C27 ,C28, C100 , C102, C29, C30, C25 , C26) .

there's an error? what are the right capacitors?

Thanks a lot for your support!
regards,
Enrico

AFE44x0SPO2EVM

hideyuki sakai — Mon, 13 May 2013 05:55:51 GMT

Dear, Sir.

AFE44x0SPO2EVM contains 5V, 3V LDO's it on.

TPS7A4901(3V LDO) would be lower output noise because it(low output noise) is the

advantage of TPS7A4901 with putting Cnr/ss it on.

In addition, LC filter(Fc=16kHz) are located following such LOD circuitry.

1. What is the special reason why LC filter put following LDO?

I wonder AFE4490 is so sensitive for the high specific frequency noise?

2. Is there any develpment criteria to be minimized above noise?

Best Regards,

SN54AHC16244

Ivan Ng — Mon, 13 May 2013 22:47:31 GMT

Like to check ig SN54AHC16244 is available for ordering.

Found this part mentioned as preview in a 2000 data sheet.

Ivan

Reagrding DDC264

hideyuki sakai — Thu, 16 May 2013 08:24:45 GMT

Dear, Sir.

My customer is evalating DDC264 for their system, now.

It is just brief, but could you please teach us following points.

1. Data sheet, page20, Figure 33.

CONV signal strobe will be needed to return to normal operation mode.

Is it a time duration definition of CONV signal strobe?

2. Data sheet, page14, Reset(/RESET).

After programming for configuration resister, Wait at least 4 conversions is required.

It is related above#1, 4 conversions might be waited after CONV signal strobe?

3. Data sheet, page 20, Configuration resister Read & Write Operation.

Described on "Optional readback of the Configuration resister is avaliable".

Readback should not be needed if a customer don't want to use it?

Best Regards,

DDC264CZAW Solder profile

William Ham — Wed, 15 May 2013 20:11:49 GMT

Hi,

Is there a DDC264CZAW document describing the temperature profile for soldering this chip onto a PCB?

I see that it has MSL Rating/Peak Reflow Level-3-260C-168 HR (Moisture Level 3, Peak Reflow Temperature of 260C with a 168C preheat). However I have not been able to find how long at soak (min duration) and at peak (max duration).

Thanks in advance,

Bill

Current consumption on SM28VLT32-HT

DJ McLeod — Mon, 13 May 2013 14:34:14 GMT

Hi,

The current is specified for the Core and I/O rails on page 4 of the datasheet for the SM28VLT32-HT part, , however it is a little unclear to me. Can you confirm that these numbers are correct:

Erase current - Core + I/O: 1.8V * 127 mA + 3.3V * 76 mA = 480 mW
Program current - Core + I/O: 1.8V * 127 mA + 3.3V * 85 mA = 510 mW

This seems like a lot of power and might be prohibitive for some of our customers designs.

Thanks!

TSW1250EVM verilog code

Hendrick Mae — Thu, 18 Apr 2013 17:59:58 GMT

HI, I am new here, and have a question for TI:

Your ADS5263 looks really good for my application, and I am considering of using on in my next fpga board. Before I actually do that, I need to test the part with Spartan-6, or Artix-7. I noticed that you have a adapter board TSW1250EVM that has a V4 FPGA on it, and the reference code of TSW1250 card would give me a leg up. Would it be possible for me to obtain the code as a reference from you guys ? Thanks

h.m.

NEED INFORMATION - DP83848-EP (V62/12615-01XE)

Jayakumara krishnasetty — Fri, 10 May 2013 17:03:36 GMT

Hi Can you please provide the Weight for the DP83848-EP (V62/12615-01XE) Part ?

Problems with FIFO SN74v245-7PAG

M.Daugschies — Thu, 15 Apr 2010 09:10:19 GMT

I design a digitalization electronic system for an ultrasonic device.

Problem:
The FIFO SN74V245 goes first well after power-up. After a few (ca. 100) write and read cycles it begins to manipulate the output data. First its like an alias effect, then the second half of the data remains nearly constant. When a reset is performed it works well first but the problem repeats. The longer the power supply is present the shorter time it takes before the problem appears. The flags do sometimes not react at all, even though these are double buffered. They are then both on a low stage. My question is, if this is a known problem and if you could help me finding the source.

Steps Needed to Recreate Problem:
The FIFO is placed on a four layer board with three ground planes, nevertheless I think it could be a ground problem. There are no decoupling capacitors near by the device. There is probably no timing problem in the read or write cycles. It is used in the standard mode with double buffered asynchronous flags. It is not used in a depth expansion. The read clock is directly connected to an oscillator, whose output is decoupled to ground. The input signals come from an analog-digital-converter, these are ok. The frequency of the write clock is 40MHz, the one of the read clock 12MHz. The write and read progress do not happen at the same time but sequentially.

DDC112 ESD protection diodes

Dries Kooistra — Wed, 17 Apr 2013 07:21:00 GMT

In the datasheet of the DDC112 are ESD protection diodes visible to protect the input of the DDC.

(Page 9, SBAS085B - January 2000 - Revised October 2004)

What are the specifications of these ESD protection diodes?

We are specifically looking at current carrying capability.

Regards,

SM470R1B1M-HT Programming/Debugging

Andreas Steiniger — Sat, 26 May 2012 09:50:31 GMT

Hi everyone,

* I have a basic question, regarding the programming of the SM470R1B1M-HT. I want to test the I/O pins with a simple routine in c.

* The JTAG interface is connected as shown in the schematic of the HEATEVM Board and accordingly IAR Kickstart Kit.

* I only have a XDS100v2 Emulator and the Code Composer Studio v5.2, but I can't choose the device in a new project, so I think the CCS and Emulator not supporting the SM470R1B1M-HT MCU with an ARM7 core.

* So my question is, what for Software & Development Tools I need to programm and debug the SM470R1B1M-HT MCU over the JTAG interface ?

* Did I need the IAR Workbench ?

* Can I choose a related device and where I can get the header files for including, or have you a simple programm example for the SM470R1B1M-HT MCU ?

Many Thanks...

Best regards

Andy

TLK2711-SP interconnection safety

marco mattavelli — Mon, 21 May 2012 14:21:53 GMT

Hi,

I need to connect a TLK2711-SP receiver with a similar transmitter device. The transmitter is powered and transmitting, while the receiver is unpowered. The coupling is AC. From the datasheet it appears that the RX differential inputs have a voltage rating of +/-0.35V when VDD is 0V, so the signal coming from the transmitter could actually exceed the input rating of the receiver.

The question is: could the unpowered receiver be really damaged by the signal coming from the transmitter, or its reliability be affected?

Thanks for the help.

regards, m. mattavelli

TPS40200 randommaly will not start properly on after quick power reset.

Kevin Shoop — Wed, 08 May 2013 19:33:22 GMT

We have built a DC-DC converter based on the TPS40200 using the design generated by SwitcherPro.

Input Voltage 36 or 45 VDC

Output voltage 28 VDC, 1 A

The application it is to be used in switches the input to the SMPS between two separate DC supplies of different voltages. Occasionally on start-up or after switching sources the output voltage drops to between 7 and 10 VDC and gets stuck there. The only thing to unstick is to disconnect all power and wait several minutes. I assume there is a something being tossed in to oscillation, maybe the SS circuit or the current sense. Any advice on root cause and a fix is appreciated.

Radiation data for TPS51200Q1

George Romaniuk — Tue, 07 May 2013 20:29:34 GMT

Hi,

I was led to believe that there is a publicly available paper with radiation data (protons) for TPS51200Q1.

Unfortunately I can't find such a paper. Do you know of such paper? Do you have radiation data for TPS51200Q1 or similar part?

Best regards,

George

OMAPL137HT AEMIF timings Temperature characterization and Max AEMIF Module clock

MAlanis — Tue, 19 Mar 2013 20:58:04 GMT

Hi,

1) The OMAPL137HT notes specifically for AEMIF timings, that "40°C to 125°C unless otherwise noted." However the device is being sold/marketed at 175C, so what are the implications of the device AC timings when running at up to 175C?

2) Also, it is not clear from the OMAPL137HT datasheet what the maximum AEMIF module clock supported speed is for ASYNC (non SDRAM) mode is? The regular OMAPL137 Datasheet Table 5-24 lists it as 10ns (implying a 100Mhz module clock), however subnote #1 of the same table, mentions that the EMIF "EMA_CLK is selected either as SYSCLK3 or the PLL output clock divided by 4.5. As an example, when SYSCLK3 is selected and set to 100MHz, E=10ns" This implies that the EMIFA clock could be operated from the PLL0/4.5, which could yield 133Mhz. Can someone sort this out please?

Regards,

Miguel

TMS470R1B1M-HT MibADC Module Power Supply Pin Unconnected

jimmy zhang77361 — Fri, 03 May 2013 06:44:50 GMT

Can I connect the power supply pin of MibADC module (VCCAD pin ) of TMS470R1B1M-HT to ground or leave it unconnected in case I do not use it in order to reduce the power consumption? We use the MibADC module to monior the power supplies on our board. The analog inputs of MibADC module are connected to several voltage supplies, but we do not need to check these voltages all the time. We may check them every 1 second. So we want to diconnect the power supply of MibADC module to save power.

Bets regards,

Jimmy

TSW1250EVM works with the AFE5809EVM

Christiam Rojas — Fri, 03 May 2013 18:11:42 GMT

Hello,

Our company buy the following kits (TSW1250EVM / AFE5809EVM / TX-SDK-V2). I ask in customer support if I can use the TSW1250 with the AFE5809 , they told me that I can (I have an email about that).

But when I install the TSW1250GUI, there is no option to choose the AFE5809.

Can you help me with this problem? Is there any update?

Best regards,

Christiam Rojas Quiroz

Need Theta jc For Hex Inverter

Thom Messenger — Thu, 02 May 2013 22:58:00 GMT

We are using 5962-8760901DA that is packaged in a CFP W package. The device is used in a space application so I am looking for a theta jc value or if available a theta junction to lead value.

Thom Messenger

AFE5807EVM/TSW1250 output incorrect

Nathan Everett — Wed, 01 May 2013 21:55:38 GMT

We are in the process of evaluating the AFE5807EVM, and are having issues getting either it or the TSW1250EVM to work correctly (not sure which is having the issue).

When I set the AFE5807EVM GUI to output the "Ramp" test pattern, it appears correctly in the Time Domain window of the TS1250 GUI, but then when I input a ~80mVp-p, 5 MHz signal into the ADC, it is "flattening" the peaks/valleys of the signal, basically converting it into a square wave that goes from the lowest (0) to highest (4096) value in the window.

Is there some setting I'm missing somewhere?

I've attached a word doc with screenshots of each tab in the AFE5807EVM GUI as well as the TSW1250 GUI.

Do the Custom Test Patterns work on the ads5263?

Ted Farver — Thu, 25 Apr 2013 14:54:32 GMT

I have been able to get the sync, skew and ramp test patterns to work fine.

When I program the single and dual custom patterns the output reverts to what looks like normal outputs.

Is there a sequence that I have to follow to set the registers up correctly?

I noticed that the data sheet (page 25) has D5 listed twice. I assume that is a typo error but that is also the register I am having issues with.

Thanks.

ADS5295 1-wire vs- 2-wire

Carsten Schafer — Mon, 29 Apr 2013 16:54:05 GMT

Hello community,

in the datasheet of the ADS5295 I found the option to run the ADC at 1-wire and 2-wire mode. Are there more differences than just 20 further MSPS when running at 2 wire mode. I need a lot of channels so it is better to run in 1-wire mode (if I just need 80 MSPS) to have more available pins at the FPGA right?

Furthermore, I am evaluating to use the GTH or GTX transceivers to interface the ADC with my FPGA. You think that is exaggerated concerning speed?

Thanks Community

Need Junction to Case (Theta JC)- TLV5638-EP (V62/03628-02XE)

Jayakumara krishnasetty — Tue, 30 Apr 2013 16:07:19 GMT

Hi Can you please provide the following information for the TLV5638-EP (V62/03628-02XE) Part ?

Thermal Resistance Junction to Case (Theta JC)

AM26LV32E-EP Failure Mode after Extended High Temp Usage

Fred Brehm1 — Tue, 30 Apr 2013 15:58:45 GMT

I have a need to receive RS-422 differential timing signals during burn-in of some custom electronics. One option is to locate the differential receivers in the burn-in oven with the unit under test. The burn-in takes place for ~250 hours @ 100C. Any receiver would be subject to this burn-in cycle multiple times (once for each unit to be tested). The reliability report for the A26LV32E-EP seems to imply that this receiver would be a good candidate device. There is a concern that if a failure should occur during burn-in, can the failure be easily isolated to the receiver IC and exonerate the unit under test. Questions: Is it reasonable to expect an AM26LV32E-EP to survive multiple burn-in cycles of ~250 hours of continuous operation @ 100C? If / when a failure of the AM26LV32E-EP does occur, is it reasonable to expect the entire device (all four receivers) to fail simultaneously? In other words, can I isolate a failure to the AM26LV32E-EP by routing a separate receiver output to the outside of the oven and then monitoring that duplicate signal to determine whether the receiver had failed?

VCA8613 CW mode

IgorM — Tue, 23 Apr 2013 08:49:56 GMT

We tried to use device in CW mode

http://www.ti.com/lit/ds/sbos200f/sbos200f.pdf

p.15: "The CW outputs are typically routed to a passive delay line, allowing coherent summing of the signals."

We connected outputs to delay line IC, provided 3,0 V on CW output pin and found that device CW output pin is bypassed.

But in pdf we can see info that device CW output is current output and not any info (inpedance, capacitance etc) about

these outputs parameters.

We have test. Connect from external generator signal to delay line and:

- when CW outputs are disconnected we see this signal on delay output line.

- when CW outputs are connected we practically can't see this signal on delay output line.

Delay line is passive (inductors and capasitors).

All voltages on device pins are according with pgf.

AFE4490 with external clock generator connected on XIN pin.

Tsvetan Mudrov — Thu, 07 Mar 2013 10:52:53 GMT

Hello.

I'm developing a device based on AFE4490. I need to connect two chips on one clock to work synchronously. I read the data sheet but I can't find any specification for external clock requirements for XIN pin - level, pin leakage current and etc. Is it possible to use AFE4490 with external clock generator at all?