数据转换器论坛 - 最近的话题

ADS131E08: ADS131E08 Daisy-Chain 多ADC采集数据异常

chris yue — Fri, 05 Jun 2026 06:43:38 GMT

Part Number: ADS131E08

ADS131E08 Daisy-Chain 多ADC采集数据异常

问题描述：

Daisy-Chain采用 Standard Configuration，如图：

系统总共有4个ADS131E08，

AVDD =3.3V，DVDD = 3.3V，各个VCAPX正常【1.18V，1.6V，5.5V】

SPS =1K， SPI时钟2.5M，每个ADS131E08使用内部时钟，内部REF，硬件START，单个测试每个device,REG配置OK，工作正常，测试稳定。

在RDY下降沿中断后通过SPI CMD=CMD_RDATA单次读取采集的数据。

问题：如果多于2个同时工作，设备会出现异常数据，实验多块板子一样，异常数据有几个时间不定会出现，简化调试用2个设备同时采集，一个设备正常工作，另外一个CS正常切换，SPI不发送和不接收，另外一个设备采样正常，一旦SPI有传输，会出现异常数据。

正常测量数据：

异常数据:

部分采样不准确了

ADS1220: 4路3线制PT100传感器通过1片4：1双通道复用开关连接到ADS1220进行比例采样，复用开关的导通电阻属于被引入到测量回路吗，如何消除影响呢

壮苏 — Fri, 05 Jun 2026 02:14:44 GMT

Part Number: ADS1220

如题

ADS1299EEGFE-PDK: ADS1299的START的引脚设置

Yi Peng — Thu, 04 Jun 2026 08:11:08 GMT

Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299

ADS1299的START的引脚能悬空吗，为什么我的采样输出全为0并且用内部检测信号测试时也全为0.

ADC12DJ3200: ADC12DJ3200 subclass1 建链问题

flye du — Wed, 03 Jun 2026 15:14:06 GMT

Part Number: ADC12DJ3200

如图所示，如果不运行 8'd116 这条关闭 adc 的sysref_recv_en 命令，fpga 204b rx sync 反复拉高，降低。运行8'd116的话，在测确定性延迟的时候，每次上电之后，确定性延迟测得周期数都不一样。（确定性延迟测试现在用的方法是接收链路上，外部同时提供一个脉冲信号给ADC和一个FPGA管脚，FPGA内部通过管脚上的脉冲使用ILA抓取信号，数时钟看看多久ADC收到信号）。

AFE5818EVM: Software installation failed

Xinlong Zhao — Tue, 02 Jun 2026 06:28:20 GMT

Part Number: AFE5818EVM

A very bad thing is that I purchased AFE5818EVM without TSW1400EVM. Is there any solution?

Even worse, when I tried to perform CW testing on AFE5818EVM through HMC-DAQ GUI, the software couldn't run and there was a graphical error. Can anyone tell me how to handle it? I am using Win11 64bit

AFE5818EVM: Software installation failed

Xinlong Zhao — Tue, 02 Jun 2026 06:22:16 GMT

Part Number: AFE5818EVM

A very bad thing is that I purchased AFE5818EVM without TSW1400EVM. Is there any solution?

ADS1285EVM-PDK: What are the board dimensions of the ADS1285EVM-PDK?

tktk arm — Tue, 02 Jun 2026 05:52:40 GMT

Part Number: ADS1285EVM-PDK

Could you please tell me the dimensions (length, width, and height) of the ADS1285EVM-PDK board? I did not find this information in the datasheet.

AFE4400: 修改发光二极管电流的问题

SolaYuki — Fri, 29 May 2026 06:38:03 GMT

Part Number: AFE4400

我在开发AFE4400的相关程序中遇到了修改电流失败的问题，我想咨询一下如果在采集过程中需要修改电流的话，一个标准的流程是怎么样的，需要重新写入所有寄存器吗？

ADS1248: 不能正确获取ADS1248的转换结果。

chao zhai — Thu, 28 May 2026 07:01:48 GMT

Part Number: ADS1248

此电路设计是否有问题，目前调试实际电路时不能正常读取转换结果。测量了±2.5V、3.3V和基准电压±2.048V都正常。

MCU可以通过SPI读写ADS1248的寄存器，但是不能控制转换和读取结果。

ADC12QJ1600EVM: Why doesn't the official website provide the schematic and PCB source files for DC091A_ADC12QJ1600-EVM-RevA？

jemmy fu — Wed, 27 May 2026 09:14:42 GMT

Part Number: ADC12QJ1600EVM

The official website only has the schematic PDF and gerber files for DC091A_ADC12QJ1600-EVM-RevA. I would like to use the original files for secondary hardware design and development to save development time. Could you please provide me with the source files? Thank you！

DDC112: 连续模式下Dvalid信号存在不触发的情况

Hale_liu Liu — Wed, 27 May 2026 02:21:19 GMT

Part Number: DDC112

始终信号10Mhz，CONV信号800hz，连续模式下Dvalid信号存在不触发的情况，且不触发的前一帧的Dvalid提前出现下降沿，返回数据明显偏小，CLK与CONV信号同步<10ns。目前无法查明原因，请帮我看下可能是什么原因。

1s采集内出现了7次。

TX75E16: How can I sign an NDA？

long zhao — Tue, 26 May 2026 11:05:08 GMT

Part Number: TX75E16

1、How can I obtain the complete datasheet of the chip?

2、How can I sign an NDA? I'm in Wuhan, China.

3、I am a hardware engineer

TX75E16: How can I sign an NDA？

long zhao — Tue, 26 May 2026 11:03:23 GMT

Part Number: TX75E16

1、How can I obtain the complete datasheet of the chip?

2、How can I sign an NDA? I'm in Wuhan, China.

3、I am a hardware engineer

ADS1299: ADS1299菊花链支持最多多少设备

hui wang — Tue, 26 May 2026 10:03:59 GMT

Part Number: ADS1299

您好，需求如下：

ADS1299芯片8通道，采样率1K，需要实现128通道，也就是16片1299芯片采用菊花链方式连接，可以实现吗？会存在什么问题？主芯片和ADS1299通过SPI通讯，主芯片采用高性能STM32H743。

AFE4400: 数据转换问题

SolaYuki — Tue, 26 May 2026 08:33:02 GMT

Part Number: AFE4400

我开发了一款血氧饱和度测试程序，该程序在使用人类手指进行测试时数据流正常，但是切换到血氧饱和度模拟器时会出现数据错误，只有打开模拟器的波长交换功能才可以得出正确的数据，这是哪个部分出现了问题。

ADS1299: ads1299外部参考电压范围

xiaolin guo — Mon, 25 May 2026 05:22:15 GMT

Part Number: ADS1299

你好，在使用±2.5V供电时，如果想使用外部参考电压，最小可以设置到多少，此时VREFN接到AGND吗还是接到AVSS

DAC161S997EVM: [Request for Guidance] How to correctly couple HART signals (TX & RX) between DAC8742HEVM and DAC161S997EVM?

yu shuang — Sat, 23 May 2026 14:55:03 GMT

Part Number: DAC161S997EVM
Other Parts Discussed in Thread: DAC8742HEVM, , DAC8742H

Hi TI support,

I am integrating the DAC8742HEVM and DAC161S997EVM to build a HART-enabled 4-20mA transmitter. I need technical guidance on the complete signal coupling DAC8742HEVM.pdf :

Connection and configuration: Should I AC-couple the MOD_OUT signal (after the 2.2µF blocking cap) directly to the HART_TX1 jumper pin on the DAC161S997EVM? Also, regarding the optional 0.022µF shunt capacitor (C15 on the DAC8742HEVM), should it be used or left open for hart mode?
Transmission path component roles: Could you please explain the function of the following components on the DAC161S997EVM transmission path: R11 (49.9Ω), C18 (6800pF), and C19 (0.22µF)? I want to understand how these components work together to inject the HART signal into the loop.
Blocking capacitor and path isolation: Is the C22 (2.2µF) capacitor on the DAC161S997EVM mandatory for this path? Additionally, I am concerned about the signal path isolation—if HART_TX1 and HART_RX1 jumpers are connected, it seems to bridge the TX and RX paths. Could you clarify the correct jumper configuration to ensure the external modem signal correctly drives the loop without interfering with the RX path?
Reception Path and Filtering: I plan to use the HART_RX1 signal (after the 200Ω resistor and 0.22µF capacitor on the DAC161S997EVM) and connect it to the MOD_IN input of the DAC8742HEVM. Is this coupling method correct? Additionally, could you explain the purpose of these two components (200Ω/0.22µF) and whether they are sufficient for the input filtering required by the DAC8742H's integrated bandpass filter?

I have attached both the DAC8742HEVM and DAC161S997EVM schematics for your reference. Any diagrams or design notes would be greatly appreciated.

Thank you for your assistance.

ADC12QJ1600EVM: Original engineering files for ADC12QJ1600EVM development board are required

jemmy fu — Fri, 22 May 2026 09:51:33 GMT

Part Number: ADC12QJ1600EVM

I need the schematic/PCB engineering source files for the ADC12QJ1600EVM. The official website only provides the schematic PDF and Gerber files. I need to perform secondary development based on TI's provided development board documentation, modify some functions, and create a test board

ADS1292R: 协助硬件设计问题

xuedong duan — Thu, 21 May 2026 07:28:29 GMT

Part Number: ADS1292R

PCB_Project.pdf 请帮忙检查一下原理图是否有问题

ADS1292R: 协助硬件设计问题

xuedong duan — Thu, 21 May 2026 07:24:54 GMT

Part Number: ADS1292R
Other Parts Discussed in Thread: ADS1292

PCB_Project.pdf 请帮忙检查一下原理图是否有问题

ADS131M02: 请问ADS131M02是否适用于热电偶测量

shimin zhang — Thu, 21 May 2026 06:32:22 GMT

Part Number: ADS131M02
Other Parts Discussed in Thread: TMP117, ADS1240

你好，我在看到《使用 ADS1118 进行精密热电偶测量》文章，但是测温范围太小。于是选择了24Bit的ADC，请问ADS131M02是否同样可以用于热电偶测量？

CJC（Cold Junction Compensation Sensor）冷端传感器，我可以适用tmp117来做。

ADS1118: ADS1118 Performance: INL Testing

fengchun tao — Thu, 21 May 2026 01:28:38 GMT

Part Number: ADS1118

Hope this message finds you well.

I am currently working on a project using the ADS1118 and am trying to characterize its static performance, specifically the Integral Nonlinearity (INL). While reviewing the datasheet, I would like to ensure I follow the correct method to obtain accurate and reliable results.

I was wondering if you could kindly share any recommended test procedures, application notes, or best practices from TI for measuring INL on this device. Any guidance on test setup, configuration, or common pitfalls to avoid would be greatly appreciated.

Thank you very much for your support. I look forward to your reply.

ADS127L14: Issue of 4‑channel parallel data output for ADS127L14 under 32.768 MHz clock

LANZHAO SHI — Tue, 19 May 2026 14:56:03 GMT

Part Number: ADS127L14
Other Parts Discussed in Thread: ISO6760,

Hello, I have revised my PCB design. The RESET, START, MODE, TDM and HDR pins are now brought out and controlled by the MCU via an independent ISO6760 isolator. In addition, the CAPA filter capacitor is changed to 10 µF and CAPD to 2.2 µF. Currently, the DCLN clock and FSYNK signals can be triggered successfully.

However, I have an issue: I need to synchronously acquire sensor data from 4 channels at a sampling rate of 515 kSPS with 24‑bit data precision, using an external 32.768 MHz clock. I configured the relevant registers via SPI, including selecting the external crystal oscillator, setting 24‑bit data format, ADC clock divider = 1, DOUT output divider = 2 (16.384 MHz), DP_TDM[1:0] = 3, and DP_DAISY = 1.

After these configurations, logic analyzer measurements show that there are only 16 clock cycles within one single FSYNK period instead of 24. Moreover, even when I set the DOUT divider to 1 via SPI, the output clock frequency remains constant at 16.7 MHz. What causes this problem?

Additionally, how should I configure the chip to achieve parallel sampling and parallel output for the 4 channels? Specifically, 4‑channel data should be output in parallel through DOUT0~3 under a single clock signal.

DAC8552: DAC8552's output keeps at level before power down

?? ? — Tue, 19 May 2026 04:11:38 GMT

Part Number: DAC8552

DAC8552's output keeps at level before power down, so I can't control the behaviour of my startup.

AMC1305M05: AMC1305M05在隔离端的供电方案问题

cooper kuo — Tue, 19 May 2026 02:30:48 GMT

Part Number: AMC1305M05

在下图在AMC1305的手册中，推荐在AVDD使用隔离供电方案（floating power supply）；这里只给出了一个低成本方案，即使用Zener diode做稳压，把AGND与AINN（the end of the shunt resistor）接在了一起；

我想确认一下：如果使用独立的隔离电源方案给AMC1305的AVDD供电，因为采样电阻在相线上，接AMC1305的AINN//AINP, 这时候还需要把隔离电源的AGND与AINN接在一起吗？

感谢~

数据转换器论坛 - 最近的话题

ADS131E08: ADS131E08 Daisy-Chain 多ADC采集数据异常

ADS1220: 4路3线制PT100传感器通过1片4：1双通道复用开关连接到ADS1220进行比例采样，复用开关的导通电阻属于被引入到测量回路吗，如何消除影响呢

ADS1299EEGFE-PDK: ADS1299的START的引脚设置

ADC12DJ3200: ADC12DJ3200 subclass1 建链问题

AFE5818EVM: Software installation failed

AFE5818EVM: Software installation failed

ADS1285EVM-PDK: What are the board dimensions of the ADS1285EVM-PDK?

AFE4400: 修改发光二极管电流的问题

ADS1248: 不能正确获取ADS1248的转换结果。

ADC12QJ1600EVM: Why doesn't the official website provide the schematic and PCB source files for DC091A_ADC12QJ1600-EVM-RevA？

DDC112: 连续模式下Dvalid信号存在不触发的情况

TX75E16: How can I sign an NDA？

TX75E16: How can I sign an NDA？

ADS1299: ADS1299菊花链支持最多多少设备

AFE4400: 数据转换问题

ADS1299: ads1299外部参考电压范围

DAC161S997EVM: [Request for Guidance] How to correctly couple HART signals (TX & RX) between DAC8742HEVM and DAC161S997EVM?

ADC12QJ1600EVM: Original engineering files for ADC12QJ1600EVM development board are required

ADS1292R: 协助硬件设计问题

ADS1292R: 协助硬件设计问题

ADS131M02: 请问ADS131M02是否适用于热电偶测量

ADS1118: ADS1118 Performance: INL Testing

ADS127L14: Issue of 4‑channel parallel data output for ADS127L14 under 32.768 MHz clock

DAC8552: DAC8552's output keeps at level before power down

AMC1305M05: AMC1305M05在隔离端的供电方案问题

ADS127L14: Issue of 4‑channel parallel data output for ADS127L14 under 32.768 MHz clock