EVAL-ADAQ7980SDZ User Guide
UG-1060
Rev. 0 | Page 11 of 30
LINK CONFIGURATION OPTIONS
Take care before applying power and signals to the evaluation
board to ensure all link positions are set as required by the
operating mode.
Table 6 shows the default positions in which the links are set
when the evaluation board is packaged. When the
EVAL-
ADAQ7980SDZ
is shipped, it is assumed the evaluation board
operates with the SDP board (SDP controlled mode).
Table 6. Links—Factory Default Settings
Link
Setting
Function
Comment
J1
A
VIN+ to noninverting input
Change to B for inverting configuration
J2
A
VIN+ to inverting path
Change to B for VCM level shift voltage
J3
A
Ground inverting path
Change to A for inverting configuration
J4
A
Reference buffer power-down signal (from SDP)
Change to B for reference buffer always on (ties it to V+)
J5
A
ADC driver power-down signal (from SDP)
Change to B for ADC driver always on (ties it to V+)
J6
A
LDO power-down signal (from SDP)
Change to B for LDO always on (ties it to VDD)
J7
A
Reference source input voltage (7.5 V or 5.0 V)
Set A to 7.5 V and B at 5.0 V
J8
A
ADR3433
enable signal
Do not alter.
J9
1
On-board reference voltage selection (5.0 V or 3.3 V)
Set 1 to 5.0 V and 3 to 3.3 V
J10
1
Reference source (on-board or externally supplied)
Change to 3 if using bench reference
J11
1
VDD supply voltage (5.0 V or 7.5 V)
Set 1 to 5.0 V and 3 to 7.5 V
J12
1
VDD source (on-board or externally supplied)
Change to 3 if using bench supplies
J13
1
V_SDP source (on-board or externally supplied)
Change to 3 if using bench supplies
J14
1
VDRIVE supply (on-board or from SDP)
Change to 3 if using SDP to provide logic level (both
settings supply 3.3 V)
J15
A
ADP2370
frequency select
Set A to 1.2 MHz and B to 600 kHz
J16
1
V+ supply voltage (7.5 V or 5.0 V)
Set 1 to 7.5 V and 3 to 5.0 V
J17
1
V+ source (on-board or externally supplied)
Change to 3 if using bench supplies
J18
1
V− source (on-board or externally supplied)
Change to 3 if using bench supplies
J19
1
V− supply voltage (nonzero or ground)
Change to 3 to ground V− supply
J20
A
VCM buffer disable pin setting
Change to B to disable VCM buffer
