|
|
PDF AD7492 Data sheet ( Hoja de datos )
| Número de pieza | AD7492 | |
| Descripción | Evaluation Board for 12-bit high speed/ low power/ successive-approximation ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AD7492 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
= EvaluationBoardfor12-bithighspeed,
low power, successive-approximation ADC
EVAL-AD7492CB
FEATURES
Full-Featured Evaluation Board for the AD7492
EVAL-CONTROL BRD2 Compatible
Stand Alone Capability
On-Board Analog Buffering and Reference
Optional On-Board Analog Bias-Up Circuit
Various Linking Options
PC Software for Control and Data Analysis when used
with EVAL-CONTROL BRD2
Interfacing to this board is through a 96-way connector. This
96-way connector is compatible with the EVAL-CONTROL
BRD2 which is also available from Analog Devices. External
sockets are provided for the CONVST input and the VIN
inputs.
OPERATING THE AD7492 EVALUATION BOARD
Power Supplies
When using this evaluation board with the EVAL-CON-
TROL BRD2, all supplies are provided from the EVAL-
CONTROL BRD2 through the 96 way connector.
INTRODUCTION
This Technical Note describes the evaluation board for the
AD7492 12-bit, high speed, low power, internal reference
and clock, successive approximation A/D converter that
operates from a single 2.7 V to 5.25 V supply. Full data on
the AD7492 is available in the AD7492 data sheet available
from Analog Devices and should be consulted in conjunction
with this Technical Note when using the Evaluation Board.
On-board components include an AD780 which is a pin
programmable +2.5 V or +3 V ultra high precision bandgap
reference, two AD797 op-amps used to buffer the analog
input, and an OP07 op-amp used to buffer the DC bias
voltage applied to the optional analog input bias-up circuit.
There are various link options which are explained in detail
on page 2.
When using the board as a stand alone unit, external supplies
must be provided. This evaluation board has five power
supply inputs: VDD, AGND, VSS, VDRIVE and DGND. +5 V must
be connected to the VDD input to supply the AVDD and DVDD
pins on the AD7492, the AD780 voltage reference, the
positive supply pin of all three op-amps and the digital
control logic. 0 V is connected to the AGND input. -5 V must
be connected to the VSS input to supply the negative supply
pins on all three op-amps. The VDRIVE input can be used to
provide an external voltage for the output drivers on the
AD7492. If an external VDRIVE is supplied, it is referenced to
the DGND input which should be tied to 0 V. The supplies are
decoupled to the relevant ground plane with 47µF tantalum
and 0.1µF multilayer ceramic capacitors at the point where
they enter the board. The supply pins of the op-amps and
FUNCTIONAL BLOCK DIAGRAM
Unipolar
Ain
Buffe r
AD7492 ADC
Bipolar
Ain
B i a s-u p
buffer
External
Reference
Vin
Ref Out
Data Bus
Control Lines
Power Supply Circuit
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
EVAL-AD7492CB
SOCKETS
There are three input sockets relevant to the operation of the
AD7492 on this evaluation board. The function of these
sockets is outlined in Table III.
Socket
SK1
SK2
SK3
Table III. Socket Functions
Function
Sub-Miniature BNC Socket for unipolar ana-
log input. Analog inputs in the acceptable
AD7492 analog input range (0 V to REFIN)
are applied to this socket. The signal is then
buffered before it is applied to the AD7492
VIN pin.
Sub-Miniature BNC Socket for external
CONVST input.
Sub-Miniature BNC Socket for Bipolar ana-
log input The AD7492 can only accept analog
inputs in the range 0 V to REFIN. Bipolar
analog inputs in the range -1.25 V to +1.25 V
applied to this socket are biased up to the
acceptable AD7492 input range by the on-
board bias-up circuit before being applied to
the AD7492 VIN pin.
CONNECTORS
There are three connectors on the AD7492 evaluation board
as outlined in Table IV.
Table IV. Connector Functions
Connector
J1
J2
J3
Function
96-Way Connector for EVAL-CONTROL
BRD2 interface connections.
External VDD, VSS & AGND power connec-
tor.
External VDRIVE & DGND power connec-
tor.
OPERATING WITH THE EVAL-CONTROL BRD2
The evaluation board can be operated in a stand-alone mode
or operated in conjunction with the EVAL-CONTROL
BRD2. This EVAL-CONTROL BRD2 is available from
Analog Devices under the order entry "EVAL-CONTROL
BRD2". When interfacing directly to this control board, all
supplies and control signals to operate the AD7492 are
provided by the EVAL-CONTROL BRD2 when it is run
under control of the AD7492 software which is provided with
the AD7492 evaluation board package. This EVAL-CON-
TROL BRD2 will also operate with all Analog Devices
evaluation boards which end with the letters CB in their title.
The 96-way connector on the EVAL-AD7492CB plugs
directly into the 96-way connector on the EVAL-CON-
TROL BRD2. No power supplies are required in the system.
The EVAL-CONTROL BRD2 generates all the required
supplies for itself and the EVAL-AD7492CB. The EVAL-
CONTROL BRD2 is powered from a 12 V AC transformer.
Suitable transformers are available as an accessory from
Analog Devices under the following part numbers:
EVAL-110VAC-US:
For use in the U.S. or Japan
EVAL-220VAC-UK:
For use in the U.K.
EVAL-220VAC-EU:
For use in Europe
These transformers are also available for other suppliers
including Digikey (U.S.) and Campbell Collins (U.K.).
Connection between the EVAL-CONTROL BRD2 and the
serial port of a PC is via a standard RS-232 cable which is
provided as part the EVAL-CONTROL BRD2 package.
Please refer to the manual which accompanies the EVAL-
CONTROL BRD2 for more details on the EVAL-CON-
TROL BRD2 package.
REV. A
–5–
5 Page 
EVAL-AD7492CB
REV. A
Figure 6. AD7492 Evaluation Board Circuit Diagram
–11–
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AD7492.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AD7490 | 12-Bit ADC | Analog Devices |
| AD7492 | Evaluation Board for 12-bit high speed/ low power/ successive-approximation ADC | Analog Devices |
| AD7495 | 1 MSPS / 12-Bit ADCs | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |