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Searching multiplying dac

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creepy

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multiplying dac

Hi together

I'm searching a multiplying dac with a wide multiplying bandwidth. I need it to design a programmable bandpass filter with resonant frequencies up to 2MHz. Therefore a multiplying bandwith of at least 20MHz would be nice. Number of bits doesen't really matter, but it should have at least 8.
I found it to be very hard to find an applicable part. Maxim once had a DAC with 40MHz multiplying bandwidth, but it's discontinued. I'll be thankful for any help.

regards

Stefan
 

multiplying bandwidth dac

Can you be more specific? The M-DAC function is:

Vout(t) = Vref(t)*Din(kT)

where T is the inverse of the input digital sampling frequency. I assume you request a wide-bandwidth MDAC for the Vref?

Willy
 

multiplying bandwidth

willyboy19 said:
Can you be more specific? The M-DAC function is:

Vout(t) = Vref(t)*Din(kT)

where T is the inverse of the input digital sampling frequency. I assume you request a wide-bandwidth MDAC for the Vref?

Willy
Click to expand...

You're right. I need the DAC as a programmable resistor in an OPAMP based fliter circuit. It's a biquad, I think. The sampling frequency doesen't really matter. The resonant frequency of the filter has not to be changeable more than 100 times per second. Common digital potentiometers, for example, are not usable at 2MHz. Maybe I'll try the AD5445. It has a multiplying bandwidth of 10MHz.

Stefan
 

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