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BW of DAC used in gain reduction mode!

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funkis

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Hello!

What kind of performance could i expect if routing a
20Mhz signal trough the reference pin (voltage mode) of a
TLC7524 ( four quadrant) 8 bit DAC? (gain reduction function).

Data sheets does not tell the fT of the internal mosfet
ladder transistors used in the DAC? Is this simply unrealistic
to route such high frequencies trough the poor DAC?
Any idea on what the Bw can be of such a multiplying DAC?

AD sugests in some of their papers that
digital pots can be used up to 10Mhz!!

Im looking for a simple way for gain reduction.

/Funkis
 

funkis

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artem said:
pin diodes ?

Unfortunately, signal (AC) is variable, DC to about 20Mhz!

Is there Pin's today that cope with low frecuencies?
Well, lower then 10Khz anyway!

/Funkis
 

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