Datasheet

EVAL-AD7265/AD7266
Rev. 0 | Page 7 of 24
Link No. Description
LK48 This link option selects the common-mode voltage applied to U8-A, the AD8022 dual op amp configuration used to perform
single-ended-to-differential conversion on the analog input.
In Position A, an external common-mode voltage can be applied to U8-A via J23.
In Position B, the +IN input is tied to AGND, in which case the AD8022 dual op amp is not used.
In Position C, a portion of V
REF
is applied to U8-A to set up the common-mode voltage.
LK50 This link option sets the dc bias voltage level that is applied to the optional bias-up circuit used in single-ended mode.
In Position A, the bias voltage is set to V
REF
/2. This configuration is used in 0 V to 2 V
REF
mode to set up the bias voltage for a
bipolar single-ended signal.
In Position B, the bias voltage is set to V
REF
/4. This configuration is used in 0 V to V
REF
mode to set up the bias voltage for a bipolar
single-ended signal.
LK51 This link option adds a 50 Ω termination to AGND at the VIN A socket (J26) of the bias-up circuit for the single-ended input.
When this link is inserted, a 50 Ω termination is added to the input signal applied to the VIN A socket (J26). This link should be
inserted if this circuit is not being used to ground the −IN input terminal of U10-A.
LK52 This link option sets the dc bias voltage that is applied to the optional bias-up circuit used in single-ended mode.
In Position A, the bias voltage is set to V
REF
/2. This configuration is used in 0 V to 2 V
REF
mode to set up the bias voltage for a
bipolar single-ended signal.
In Position B, the bias voltage is set to V
REF
/4. This configuration is used in 0 V to V
REF
mode to set up the bias voltage for a bipolar
single-ended signal.
LK53 This link option adds a 50 Ω termination to AGND at the VIN B socket (J27) of the bias-up circuit for the single-ended input.
When this link is inserted, a 50 Ω termination is added to the input signal applied to the VIN B socket (J27). This link should be
inserted if this circuit is not being used to ground the −IN input terminal of U11-B.
LK54 Not populated.
LK55 Not populated.
LK56 This link option is used to select the source of the V− (−12 V) supply, which is used to power the op amps.
In Position A, V− is supplied by the EVAL-CED1Z through the 96-way connector.
In Position B, V− is supplied from an external source via the power connector, J30.
LK57 This link option is used to select the source of the V+ (+12 V) supply, which is used to power the op amps.
In Position A, V+ is supplied by the EVAL-CED1Z through the 96-way connector.
In Position B, V+ is supplied from an external source via the power connector, J30.