Analog Devices EVAL-ADA4570SDZ User Manual page 5

User Guide
EVALUATION BOARD HARDWARE
Using an External Digital Interface
The EVAL-ADA4570SDZ facilitates a configuration option where
the user can connect an external microcontroller or field program-
mable gate array (FPGA) to the on-board
Figure 4).
Figure 4. Typical Connection Diagram for Using the Digital Interface
Connector P2, shown in Figure
to power the AD7266 ADC and the
interface to the AD7266 ADC. This configuration allows users to
monitor the digitized output of the ADA4570 with a user preferred
embedded hardware platform. The pinout of Connector P2 is listed
in Table 2. The SDP controller board supports a maximum SPI
speed of 10 MHz, which limits the sampling rate of the AD7266
ADC to 625 kSPS. This configuration can be used to facilitate data
acquisition with a faster sampling rate up to 2 MSPS.
Figure 5. Connector P2 for Access to the SPI of the ADC of the EVAL-
ADA4570SDZ
Table 2. Optional Digital Interface Connection of P2
Pin Name Input Type
VDD Supply
OUT1, OUT2, Digital inputs and
CLK, CS outputs
VIO Supply and digital
input for
REF_SELECT of
the AD7266
A0, A1, A2 Digital inputs
GND Ground
analog.com
AD7266 ADC (see
4, provides the required connectivity
ADA4570 as well as the
Description
The 5 V input that supplies the evaluation
board.
SPI.
When used in this configuration, VIO
selects the AD7266 ADC reference
source. If high, it is the external ADC
reference, and if low it is the internal 2.5 V
reference.
Digital inputs to control the input channel
of the ADC. The Ax pins can control which
output configuration is sampled by the on-
board ADC.
Ground connection of the EVAL-
ADA4570SDZ.
For full details about the SPI and how to interface the different pins,
refer to the EVAL-ADA4570SDZ schematics (see
Figure 28) and the AD7266 data sheet.
Direct Analog Interface with the ADA4570
The EVAL-ADA4570SDZ facilitates a configuration option where
the user can connect an external ADC to the
signals (see Figure 6).
Figure 6. Typical Connection Diagram for Using Direct Access to the
ADA4570 Sensor
Connector P1, shown in Figure
to supply the ADA4570 and access to the ADA4570 output signals
for the external ADC. This configuration allows users to sample
the sine and cosine outputs of the ADA4570 with a user preferred
differential ADC. The pinout of Connector P1 is listed in
Figure 7. Connector P1 for Direct Access to the Sensor Output
Table 3. Optional Analog Interface Connection of P1
Pin Name Input Type
VDD Supply
VSIN− Analog output
VSIN+ Analog output
VCOS− Analog output
VCOS+ Analog output
VTEMP Analog output
NC Ground
GND Ground
For full details about the ADA4570 sensor interface and how to
connect the device, refer to the EVAL-ADA4570SDZ schematics
(see Figure 27 and Figure 28) and the ADA4570 data sheet.
EVAL-ADA4570
Figure 27 and
ADA4570 output
7, provides the required connectivity
Table
Description
5 V supply of the EVAL-ADA4570SDZ
Negative analog sine output from the
ADA4570
Positive analog sine output from the
ADA4570
Negative analog cosine output from the
ADA4570
Positive analog cosine output from the
ADA4570
Analog output from the ADA4570
No connect pin
Ground connection of the EVAL-
ADA4570SDZ
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3.