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參數(shù)資料
| 型號： | EVAL-AD7707EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Evaluation Board for the AD7707 3V/5V, +/-10V Input Range, 1mW, 3Channel, 16-Bit, Sigma Delta ADC |
| 中文描述： | 評估板AD7707 3V/5V，/ - 10V的輸入范圍，1mW的，3Channel，16位Σ-Δ模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 525K |
| 代理商： | EVAL-AD7707EB |
EVAL-AD7707EB
a
FEATURES
Full-Featured Evaluation Board for the AD7707
On-Board Reference and Digital Buffers
Various Linking Options
PC Software for Control of AD7707
On-Board Patchwork Area
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
Other components on the AD7707 Evaluation Board include
an AD780 (a precision 2.5V reference), an AD589 (a 1.23V
precision bandgap reference), a 4.9152 MHz crystal and
digital buffers to buffer signals to and from the PC.
OPE RAT ING T HE AD 7707 E VAL BOARD
Power Supplies
T his evaluation board has two analog power supply inputs:
AV
DD
and AGND. An external +5V or +3V must be applied
between these inputs which is used to provide the AV
DD
for the
AD7707 and the reference. DGND and DV
DD
connections
are also available. T he DV
DD
is used to provide the DV
DD
for
the AD7707 DV
DD
pin and the digital circuitry. When AV
DD
is set to +5V, DV
DD
can be +3V or +5V. When AV
DD
is set
to +3V, DV
DD
can only be +3V. DV
DD
should never exceed
AV
DD
. DGND and AGND are connected together under the
AD 7707. T herefore, it is recommended not to connect
AGND and DGND elsewhere in the system.
All power supplies are decoupled to their respective grounds.
DV
DD
is decoupled using a 10μF tantalum capacitor and
0.1μF ceramic capacitor as close as possible to the AD7707
DV
DD
pin. It is again decoupled using 0.1μF capacitors as
close as possible to each logic device. AV
DD
is decoupled
using a 10μF tantalum capacitor and 0.1μF ceramic capaci-
tor as close as possible to the AD7707 and also at the
reference.
Evaluation Board for the AD7707 3V/5V, +/-10V Input
Range, 1mW, 3Channel, 16-Bit, Sigma Delta ADC
INTRODUCTION
T his T echnical Note describes the evaluation board for the
AD7707, 3V/5V, +/-10V Input Range, 1mW, 3 Channel, 16-
Bit, Sigma Delta ADC. T he AD7707 is a complete analog
front end for low frequency measurement applications. T his
three-channel device can accept either low level input signals
directly from a transducer or high level (± 4 x VBIAS) signals
and produce a serial digital output. T he AD7707 operates
from a single 2.7V to 3.3V or 4.75V to 5.25V supply. T he
AD7707 features two low level pseudo-differential analog
input channels, one high level input channel and a differential
reference input. Full data on the AD7707 is available in the
AD7707 datasheet available from Analog Devices and should
be consulted in conjunction with this T echnical Note when
using the evaluation board.
T he evaluation board interfaces to the parallel port of an IBM
compatible PC. Software is available with the evaluation
board which allows the user to easily program the AD7707.
Figure 1: Evaluation Board Setup
36-WAY
CENTRONICS
CONNECTOR
9-WAY D-TYPE CONNECTOR
AD780
REFERENCE
AD7707
ADC
AVDD
AGND
DVDD
DGND
BUFFERS
MCLK IN
VREF-
VREF+
AIN1
AIN2
AIN3
HBIAS
CRYSTAL
AGND
AD1580
REFERENCE
HCOM
LCOM
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