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UG-xxx-AD7276
POWER SUPPLIES
Care should be taken before applying power and signals to the
evaluation board to ensure that all link positions are as required
by the operating mode.
When using the EVAL-AD7276SDZ in conjunction with the
EVAL-SDP-CB1Z board, connect the AC transformer to
connector J1. VDD,+AMP and -AMP are generated on-board.
Alternatively a bench power supply may be connected to J2 to
supply 7V to 9V
Table 3. External Power Supply Requirements
POWER
VOLTAGE
PURPOSE
SUPPLY
RANGE
1
VIN
7V to 9V
Supplies all onboard power supplies
which generate all required voltages
J1
to run the evaluation board
J2
AMP+
+5V
Amplifier positive supply
J3-3
AMP-
-5V
Amplifier negative supply
J3-1
VDD
2.35V to
VDD digital supply.
3.6V
J4
1.
When this is supplied all other power supplies are available onboard.
If this supply is not used then all other supplies must be sourced from
an external source.
SERIAL INTERFACE
The AD7276 uses a high speed serial interface which allows
sampling rates up to 3MSPS. For details on the operation of the
serial bus, refer to the AD7276 datasheet.
The EVAL-AD7276SDZ communicates with the EVAL-SDP-
CB1Z board using level shifters. The EVAL-SDP-CB1Z
operates at a 3.3V logic level. This allows VDRIVE voltages to
exceed 3.3V to be used without damaging the SDP interface.
Details of the serial interface can be found in the AD7276
Datasheets.
STAND-ALONE MODE
The EVAL-AD7276SDZ may also be used without the EVAL-
SDP-CB1Z. In this case, connection to the digital interface in
made via the SMB footprints as follows:
Table 4. Standalone Jumper Settings
PIN
SMB
J6
CS
SCLK
J8
SDATA
J9
ANALOG INPUTS
Two options are available:
VIN (J7)
Use this input when a unipolar signal source is available. The
input is buffered by U7 and fed to the AD7276 via an R-C filter.
Table 5. Unipolar Input Jumper Settings
LINK
JUMPER SETTINGS
LK8
Removed
All other link as Table 2 Link Options -Setup condition
VIN UNBIASED (J5)
Use this when the signal source is bipolar. The input is biased
up by U6 and buffered by U7 and fed to the AD7276 via an R-C
filter.
Table 6. Bipolar Input Jumper Settings
LINK
JUMPER SETTINGS
LK11
Removed
All other link as Table 2 Link Options -Setup condition
Rev. PrA | Page 8 of 28
Evaluation Board User
Guide
JUMPER SETTINGS
Shorting link in position B
Shorting link in position B
Shorting link in position B
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