AD9238 ADC Voltage Input

xuxiangyi666@gmail.com on Jan 8, 2015

I am planning to use the AD9238 as my ADC chip. But my input voltage range is +-1V, it means it could be negative voltage input. My question is whether the AD9238 could accept the negative voltage input while it use single power supply(0-3.3V). Thanks!

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0 xuxiangyi666@gmail.com on Jan 8, 2015 4:09 AM

Oh. Thanks. So do you mean if I use Figure 64. The Vth could be +-1V, and the differential output Vo is always above 0V, so it could match the range of AD9238. Right? But I have another question, when I use AD9706 DAC, the output of that is above GND. Which chip do you recommend to convert that into +- voltage. For example, if the AD9706 output range is 0 to 1V, how could it convert it to -0.5 to 0.5V. Thanks!
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0 xuxiangyi666@gmail.com on Jan 8, 2015 4:09 AM

Oh. Thanks. So do you mean if I use Figure 64. The Vth could be +-1V, and the differential output Vo is always above 0V, so it could match the range of AD9238. Right? But I have another question, when I use AD9706 DAC, the output of that is above GND. Which chip do you recommend to convert that into +- voltage. For example, if the AD9706 output range is 0 to 1V, how could it convert it to -0.5 to 0.5V. Thanks!
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