THS1030 Datasheet, PDF (14/22 Pages) Texas Instruments – 2.7 V . 5.5 V, 10-BIT, 30 MSPS CMOS ANALOG-TO-DIGITAL CONVERTER

THS1030
2.7 V – 5.5 V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS243A – NOVEMBER 1999 – REVISED JANUARY 2000
PRINCIPLES OF OPERATION
V_REF-pin reference (continued)
THS1030
ADC/DAC
REF
+
_
+
VBG _–
VREF = 1 + (Ra/Rb)
Ra
REFSENSE
Rb
AGND
Figure 12. 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.
THS1030
ADC/DAC
REF
+
_
+
VBG _–
VREF = External
REFSENSE
AVDD
AGND
Figure 13. V_REF External Reference Mode
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