Power Supplies; Serial Interface; Sdp Limitations; Standalone Mode - Analog Devices AD7366 User Manual

UG-408

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-AD7366SDZ/EVAL-AD7367SDZ in
conjunction with the EVAL-SDP-CB1Z
transformer to connector J702. VCC, VDD, VSS, and VDRIVE
are generated on board. Alternatively, a bench power supply
may be connected to J700 to supply 7 V to 9 V.
Each supply is decoupled on the EVAL-AD7366SDZ/EVAL-
AD7367SDZ using 10 µF and 0.1 µF capacitors.
Table 3. External Power Supply Required
Power Voltage
Supply Range Purpose
VIN 1 7 V to 9 V Supplies all on-board power
J700 or supplies, which generate all required
J702 voltages to run the evaluation board
VDD 12 V to Amplifier +VDD
J100 16.5 V
VSS −12 V to Amplifier −VSS
J100 −16.5 V
DVCC 4.75 V to ADC digital supply
J703 5.25 V
AVCC 4.7 V to ADC analog supply
J704 5.25 V
VDRIVE 2.7 V to Supply voltage for the digital
J1 5.25 V interface circuitry
1
When this is supplied, all other power supplies are available on board. If this
supply is not used, then all other supplies must be sourced from an external
source.

SERIAL INTERFACE

The AD7366/AD7367 uses a high speed serial interface,
which allows sampling rates up to 800000. For details on the
operation of the serial bus, refer to the
data sheet.
The EVAL-AD7366SDZ/EVAL-AD7367SDZ communicates
with the EVAL-SDP-CB1Z board using level shifters. The
EVAL-SDP-CB1Z operates at a 3.3 V logic level. This allows
VDRIVE voltages that exceed 3.3 V to be used without
damaging the SDP interface.
Details of the serial interface can be found in the
AD7367 data sheet.

SDP LIMITATIONS

Due to limitations in the speed of the EVAL-SDP-CB1Z in this
application, the maximum sample rate is limited to 800000
samples per second. This limitation does not apply when using the
EVAL-AD7366SDZ/EVAL-AD7367SDZ in standalone mode.
board, connect the ac
AD7366/AD7367
AD7366/
Rev. A | Page 8 of 20
Evaluation Board User Guide

STANDALONE MODE

The evaluation board may also be used without the
CB1Z. In this case, connection to the digital interface in made
via the SMB connectors or, if preferred, by the test points.

ANALOG INPUTS

The analog inputs on the EVAL-AD7366SDZ/EVAL-
AD7367SDZ are filtered and buffered by the AD8021, low
noise, high speed amplifier for 16-bit systems. The outputs from
these amplifiers are connected to the
low-pass RC filter network.
Alternatively, these buffers may be bypassed by solder link
jumpers.

REFERENCE OPTIONS

The reference source can be from the
REFOUT pin or from an AD780. An external reference voltage
may also be applied to DCAP_A or DCAP_B SMB connectors

SOCKETS/CONNECTORS

The functions of the socket connectors are shown in Table 4.
Table 4. Socket Connector Functions
Socket Function
VA1 Input SMB for VA1
VA2 Input SMB for VA2
VB1 Input SMB for VB1
VB2 Input SMB for VB2
J1 VDRIVE terminal connectors
VIN Bipolar input
DCAPA/B_BUFF Buffered output of D
Connection point for external reference to
EXT REFA/B bias up circuit
BIASED_VIN1 Biased version of signal at VIN socket
DCAP_A External input for D
DCAP_B External input for D
DOUT_A External serial data A output
DOUT_B External serial data B output
CONVST External CONVST input
CS External CS input
BSY External serial data output
SCK External SCK input
J100 VSS and VDD screw terminal connectors
7 V to 9 V bench supply screw terminal
J700 connector
J702 7 V to 9 V dc transformer power connector
J703 AVCC screw terminal connectors
EVAL-SDP-
AD7366/AD7367 via a
AD7366/AD7367 REFIN/
A/D B
CAP CAP
A
CAP
B
CAP