您好！我最近购入了一块 EVAL-AD7928SDZ 的ADC芯片的评估板产品，但是测试时发现如下异常：连接电源后，用万用表测出的T4测试点的电压（AVDD）为6.91V，根据数据手册，此处应为+5V的输出（已通过短路帽选择由板子产生5V的AVDD），由于电压不匹配，导致无法正常使用。

Hello all,

first poster here...

I'm trying to use a AD7928 ADC via a Microchip dsPIC33F SPI bus. I'm communicating with other DACs via the same SPI without problem but the AD7928 does not work properly.

Results are the same if the SPI is in 8…

Hello 

where can I find the schematics of EVAL-AD7928 ? 

There was an answer under a similar topic here, but attachment is missing.

https://ez.analog.com/data_converters/precision_adcs/f/q-a/23933/schematic-for-the-ad7928-eval-board/166567#166567 

Hi, All!

The AD7928 ADC input is supplied with a pulsed signal of ~1us duration. The ADC will make a acquisition for 300 ns after falling edge of CS signal and then will do the conversion for several SCLK cycles. The changing the input signal after acquisition…

Hello,

I'm planning to use a Low Dropout regulator LT1129 to supply the power to a AD7928. Since the reference Input voltage to this ADC requires +/-1% for specified performance, I wonder if the use of a switching supply is recommended?.

How much…

Hello,

I would like to know if you could provide some facts in terms of specifications for the LT1129-5 and ADP7102 that can help to define which fits better for providing power to the AD7928.

I wonder if I can use a switching supply along with the LT1129…

Hello

I would like to use AD7927 at VDD=5V, Vdrive=3.3V and input range =0~2*REFin.

Can I use AD7928 at this condition ?

The datasheet rev.E P.3 says below about 0~2*REFin  input range.

"RANGE bit set to 0, AVDD/VDRIVE = 4.75 V to 5.25 V" 

ad7928 采样的时候是如何处理机制的

AD7928Data2.WRITE_SEQ = 0X11;

  AD7928Data2.DONT_TCARE_9_ADD2 = 0X01;

  AD7928Data2.ADD1_ADD0 = 0X00;

  AD7928Data2.PM1_PM0 = 0X11;

  AD7928Data2.SHADOW_DONT_TCARE_2 = 0X10;

  AD7928Data2.RANGE_CONDING = 0X11;

u16 AD7928_Read_ADC1…