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EVAL-AD7265/AD7266
Rev. 0 | Page 10 of 24
Table 5. Link Positions for Differential Mode of Operation with a 0 V to 2 V
REF
Input Range When a Bipolar Single-Ended Signal Is
Used with the Single-Ended-to-Differential Converter
Link No. Position Function
LK1 B V
A1
is supplied from the positive output (V1+) of the single-ended-to-differential converter, U5-B, in which
case a single-ended signal must be applied to V1 DIFF via Socket J17.
LK2 B V
A2
is supplied from the negative output (V1−) of the single-ended-to-differential converter, U5-A, in which
case a single-ended signal must be applied to V1 DIFF via Socket J17.
LK20 A The RANGE pin is tied to V
DRIVE
(Logic 1). Therefore, the device is configured for an analog input range of 0 V to
2 V
REF
.
LK21 B The ADC is tied to DGND and, therefore, the ADC is configured to operate in differential mode.
LK31 Open The single-ended-to-differential converter, U5-B, is in use.
LK32, LK34 Closed These links should be closed as the bipolar analog input signal biased around 0 V is applied to J17.
LK33 C A portion of V
REF
is applied to U5 to set up the common-mode voltage.
Table 6. Link Positions for Differential Mode of Operation When a Unipolar Input Signal Is Used with the Single-Ended-to-
Differential Converter
Link No. Position Function
LK1 B V
A1
is supplied from the positive output (V1+) of the single-ended-to-differential converter, U5, in which case a
single-ended signal must be applied to V1 DIFF via Socket J17.
LK2 B V
A2
is supplied from the negative output (V1−) of the single-ended-to-differential converter, U5, in which case
a single-ended signal must be applied to V1 DIFF via Socket J17.
LK21 B The ADC is tied to DGND and, therefore, the ADC is configured to operate in differential mode.
LK31 Open The single-ended to differential converter, U5, is in use.
LK32, LK34 Open These links should be open as the bipolar analog input signal biased around 2.5 V is applied to J17.
LK33 C A portion of V
REF
is applied to U5-A to set up the common-mode voltage.
LK50 A The bias input for U12-A is set to V
REF
/2.