UG-478 Datasheet, PDF (5/40 Pages) Analog Devices – Evaluation Board for the AD7176-2—24-Bit, 250 kSPS Sigma-Delta ADC with 20 μs Settling

Evaluation Board User Guide
UG-478
Link No.
SL9
SL10
SL11
AVSS to
AGND
Default Option
B
B
B
Description
With this link in Position A, the AIN2 analog input on the AD7176-2 device is connected to Connector J8.
With this link in Position B, the analog input applied via Connector J8 is buffered using the AD8656 before
being applied to the AIN2 pin.
With this link in Position C, the analog input path includes the AD8475 amplifier; therefore, in conjunction
with AIN3, an attenuating single-ended to differential driver is implemented.
With this link in Position A, the AIN3 analog input on the AD7176-2 device is connected to Connector J8.
With this link in Position B, the analog input applied via Connector J8 is buffered using the AD8656 before
being applied to the AIN3 pin.
With this link in Position C, the analog input path includes the AD8475 amplifier; therefore, in conjunction
with AIN2, an attenuating single-ended to differential driver is implemented.
With this link in Position A, the AIN0 analog input on the AD7176-2 device is connected to Connector J8.
With this link in Position B, the analog input applied via Connector J8 is buffered using the AD8656 before
being applied to the AIN0 pin.
With this link in Position C, the analog input path includes the ADA4940-1 differential amplifier; therefore,
in conjunction with AIN1, a single-ended to differential driver is implemented.
With this link in Position D, AIN0 is connected to Header J10.
When these links are inserted, AVSS is tied to AGND. When AVSS is set to −2.5 V, these links must be
removed.
On-Board Connectors
Table 2 provides information about the external connectors on the EVAL-AD7176-2SDZ.
Table 2. On-Board Connectors
Connector
J1
J4
J5
J8
J9
J10
J13
Function
A 120-pin connector that mates with the EVAL-SDP-CB1Z (black colored controller board).
Bench top power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to power the
evaluation board.
Wall wart (dc plug) power supply voltage input. Apply 7 V to 9 V and GND (0 V) to this connector to
power the evaluation board.
Main analog input connector. Connections to AIN0 to AIN4 are available, along with GND connections.
Optional external connector, allowing external bench top or alternative supply for AVDD1, AVDD2, and
VIO supplies. When split supplies are used, AVSS is supplied externally via J9.
A 7-pin connector that can be used to connect an external amplifier to Pin AIN0 and Pin AIN1 of the AD7176-2.
A 7-pin connector that allows connection to Pin AIN0 and Pin AIN1 of the AD7176-2.
Rev. 0 | Page 5 of 40