THS1040 Datasheet, PDF (20/32 Pages) Texas Instruments – 3-V, 10-BIT , 40-MSPS CMOS ANALOG TO DIGITAL CONVERTER

THS1040
SLAS290C − OCTOBER 2001 − REVISED OCTOBER 2004
PRINCIPLES OF OPERATION
onboard reference generator configuration (continued)
+
VBG _
ADC
References
Buffer A2
MODE =
AVDD _{or AVDD}
2
+
VREF = 1 V
_
10 kΩ
10 kΩ
REFSENSE
0.1 µF 1 µF
AGND
Figure 26. 1-V VREF Using the Internal Bandgap Reference A1
+
VBG _
ADC
References
Buffer A2
MODE =
AVDD
2
or AVDD
+
_
VREF = (1 + Ra/Rb)/2
Ra
REFSENSE
Rb
0.1 µF 1 µF
AGND
Figure 27. External Divider Mode
20
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