Hi cevdet29,
The AD7794 suggests the use of ADR391 and ADR381 which are 2.5 V micropower low noise voltage reference.
For 3.3V, I suggest you use the ADR4533 which is ultra-low noise but has Is=950uA compared to the ADR391 with Is=120uA.
Yes you can connect…
This was answered on another thread, so i copied it and pasted it below.
------------------------
Hi cevdet29,
The AD7794 suggests the use of ADR391 and ADR381 which are 2.5 V micropower low noise voltage reference.
For 3.3V, I suggest you use the ADR4533…
I am using AD5445 to generate output voltage 0-1.25V from a single 5V supply.
I literally implemented circuit from the figure 51.
Vin is supplied from ADR391 (2.5V voltage reference), the bias voltage is exactly 1/2 of the Vref.
My output buffer is…
| LT1460 |
| LTC1258 |
| LT1021 |
| LT1027 |
| LTC1798 |
| RH1021-10 |
| RH1021-5 |
| RH1021-7 |
| LT6660 |
| LH0070 |
| LTC6655 |
| AD2700 |
| AD2702 |
| AD584S |
| REF01S |
| REF05S |
| REF10S |
| REF43S |
| REF02S |
| AD1582 |
| AD1583 |
| AD1584 |
| AD1585 |
| LT1019 |
| LT1236 |
| LTC6652 |
| REF02… |
用AD8275驱动AD7685已经是绝配了，中间不需要缓冲了，到是AD8275的输入端需要增加滤波电路，根据你0-10V的带宽设置滤波器参数。还有用4.096V的基准电压不好吗？去掉AD8031部分电路吧，设计PCB时ADR391的3、4引脚在AD6875的1脚相连。再建议：要保证AD_5V电源的低噪声。
Hi Ocela,
As mentioned on the AD7788 datasheet it can have a unipolar and bipolar ranges. The Ain+ input can be referred to the Ain-. As an example, when using 2.5V on Ain-. The input voltage range is from 2.5V to 5V but when it is in bipolar mode the…
Hello,
I'm looking for low-cost,low-noise voltage reference IC for precision ADC.
ADR391/381/361 are matched for my purpose.
So,I'd like to know the value of noise density at 100KHz.
I can see this value only on datasheet of ADR391,however…
Hi Kevin,
The input range is defined by Vref. So, with a 2.5V reference, the input range is +/-2.5V/gain which equals +/-19.5 mV. If you are using an absolute reference, a low-noise reference such as the ADR381/ADR391 should be used.
Regards,
John…
Hello
I have a sensor that provides its value between 0.5V to 2.5V.
I am using an AD7789 with 2.5V reference voltage (ADR391) to REF +, ref- grounded. (AGND = DGND = global GND)
AIN- to ground
AIN + directly to sensor signal
When reading the result of…
Hi,
I am a student in final year of engineering. As a part of our curriculum, we have to make a project. My project is to develop a data acquisition card. The features required for my project is along the lines of CN0194, but instead of SDP board, I…
