THS1031 Datasheet, PDF (15/26 Pages) Texas Instruments – 2.7 V . 5.5 V, 10-BIT, 30 MSPS CMOS ANALOG-TO-DIGITAL CONVERTER

THS1031
2.7 V – 5.5 V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS242A – NOVEMBER 1999 – REVISED JANUARY 2000
PRINCIPLES OF OPERATION
reference operations (continued)
D External divider: The internal reference can be set to a voltage between 1 V and 2 V by adding external
resistors.
THS1031
ADC/DAC
REF
+
_
+
VBG _–
VREF = 1 + (Ra/Rb)
Ra
REFSENSE
Rb
AGND
Figure 13. V_REF External Divider Reference Mode
D External reference: The internal reference may be overridden by using an external reference. This
condition is met by connecting REFSENSE to AV_DD and an external reference circuit to the V_REF pin.
THS1031
ADC/DAC
REF
+
_
+
VBG _–
VREF = External
REFSENSE
AVDD
AGND
Figure 14. V_REF External Reference Mode
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
15