Datasheet

EVAL-AD7265/AD7266
Rev. 0 | Page 9 of 24
Link No. Position Function
LK33 B The input to U5-A is tied to AGND because it is not used in single-ended mode.
LK36 Closed The input to U6-B is tied to AGND because it is not used in single-ended mode.
LK37, LK39 Closed The inputs to U6-A are tied to AGND because they are not used in single-ended mode.
LK38 B The input to U6-A is tied to AGND because it is not used in single-ended mode.
LK41 Closed The input to U7-B is tied to AGND because it is not used in single-ended mode.
LK42, LK44 Closed The inputs to U7-A are tied to AGND because they are not used in single-ended mode.
LK43 B The input to U7-A is tied to AGND because it is not used in single-ended mode.
LK46 Closed The input to U8-B is tied to AGND because it is not used in single-ended mode.
LK47, LK49 Closed The inputs to U8-A are tied to AGND because they are not used in single-ended mode.
LK48 B The input to U8-A is tied to AGND because it is not used in single-ended mode.
LK50 B The bias input for U12-A is set to V
REF
/4.
LK51 Open Bias-up circuit is in use.
LK52 B The bias input for U12-B is set to V
REF
/4.
LK53 Open Bias-up circuit is in use.
LK56 A V− is supplied by the EVAL-CED1Z.
LK57 A V+ is supplied by the EVAL-CED1Z.
Table 3. Link Positions for Single-Ended Mode of Operation with a 0 V to 2 V
REF
Input Range When a Bipolar Single-Ended Signal Is Used
Link No. Position Function
LK20 A RANGE is tied to V
DRIVE
(Logic 1). The analog input range is 0 V to 2 V
REF
.
LK21 A SGL/
DIFF
is tied to V
DRIVE
, enabling single-ended mode.
LK50 A The bias input for U12-A is set to V
REF
/2.
LK51 Open Bias-up circuit is in use.
LK52 A The bias input for U12-B is set to V
REF
/2.
LK53 Open Bias-up circuit is in use.
Table 4. Link Positions for Differential Mode of Operation with a 0 V to 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 B The RANGE pin is tied to DGND (Logic 0). Therefore, the analog input range is 0 V to 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 when the bipolar analog input signal biased around 0 V is applied to J17.
LK33 C A portion of V
REF
is applied to U5-A to set up the common-mode voltage.