Hi all,
we are trying to replace current 14-bit DAC (LTC1668) with some new 16-bit DAC from TI.
End application: electron microscop
Usage: DAC is used to scatters electron beams in X and Y axis and hence you can scan the surface of the sample.
Parameters of current solution w/ 14-bit DAC LTC1668 that w need to improve:
Monotonicity 14 Bits (need to improve):
INL typ±2 max±8 LSB
DNL typ±1 max±4 LSB (same or better needed - key for us, unfortunately DAC 3482 and DAC 38J82 has a "saw" linearity)
SFDR fCLK = 25Msps, fOUT = 1MHz
Range to Nyquist:
0dB FS Output min78 typ87 dB
–6dB FS Output 87 dB
–12dB FS Output 83 dB
DNL graf of LTC1668:
In comparison: DAC3482 has worse DNL and INL (and datasheet shows just typical values):
Could you pleae advice the chip that has better parameters than LTC1668 and can be used for this application.
Many thanks.
Daniel
