UG-450
EVAL-AD7276SDZ User Guide
Rev. 0 | Page 8 of 20
EVALUATION BOARD HARDWARE
AD7276
DEVICE DESCRIPTION
The
AD7276
can interface to microprocessors or DSPs.
The input signal is sampled on the falling edge of CS, and the
conversion is also initiated at this point. There are no pipeline
delays associated with the part.
The
AD7276
uses advanced design techniques to achieve very
low power dissipation at high throughput rates.
The reference for the part is taken internally from V
DD
. This
allows the widest dynamic input range to the ADC; therefore,
the analog input range for the part is 0 V to V
DD
. The conversion
rate is determined by the SCLK.
For more information about the
AD7276
, refer to the
AD7276
data
sheet, which should be used in conjunction with this user guide.
POWER SUPPLIES
The
EVAL-AD7276SDZ
can be used in two modes: SDP
controlled mode and standalone mode (see the Modes of
Operation section for more information).
When the
EVAL-AD7276SDZ
board is used in conjunction with
the
EVAL-SDP-CB1Z
board (SDP controlled mode), connect the
ac transformer to Connector J1 on the
EVAL-AD7276SDZ
board. The V
DD
, +AMP, and −AMP supplies are generated on
board. When the
EVAL-AD7276SDZ
board is used in standalone
mode, the V
DD
and amplifier supplies must be sourced from
external sources (see Table 1).
Alternatively, a bench power supply can be connected to J2 to
supply 7 V to 9 V.
Table 1. External Power Supplies Required
Power Supply
Connector
Voltage Range
Purpose
V
IN
1
J1 or J2
7 V to 9 V
Supplies all on-board power supplies, generating all required voltages to run the
evaluation board
+AMP
J3-3
+5 V
Supplies the positive rail of the amplifier
−AMP
J3-1
−5 V
Supplies the negative rail of the amplifier
V
DD
J4
2.35 V to 3.6 V
Supplies the V
DD
digital supply
1
When V
IN
is supplied, all other power supplies are available on board. If the V
IN
supply is not used, all other power supplies must be sourced from an external source.
