THS1030_13 Datasheet, PDF (15/39 Pages) Texas Instruments – 3-V TO 5.5-V, 10-BIT, 30MSPS CMOS ANALOG-TO-DIGITAL CONVERTER

THS1030
3ĆV TO 5.5ĆV, 10ĆBIT, 30 MSPS
CMOS ANALOGĆTOĆDIGITAL CONVERTER
SLAS243E − NOVEMBER 1999 − REVISED DECEMBER 2003
PRINCIPLES OF OPERATION
full external reference mode (mode = AGND)
REFTF
AIN+
REFTS
REFBS
1
Sample
−1/2 and
−1/2 ^Hold
Internal
Reference
Buffer
ADC
Core
REFBF
Figure 12. ADC Reference Generation, Full External Reference Mode (MODE = AGND)
It is also possible to use REFTS and REFBS as sense lines to drive the REFTF and REFBF lines (Kelvin mode)
to overcome any voltage drops within the system. See Figure 14.
+FS
AVDD
2 _−FS
AVDD
AIN REFSENSE
DC SOURCE = + FS
REFTS
DC SOURCE = −FS
0.1 µF
0.1 µF
10 µF 0.1 µF
REFBS
REFTF
REFBF
MODE
Figure 13. Full External Reference Mode
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