參數(shù)資料
型號: EVAL-AD7898CB
廠商: Analog Devices, Inc.
英文描述: Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package
中文描述: 評估板為5V,12位,串行220kSPS ADC的8引腳封裝
文件頁數(shù): 1/13頁
文件大?。?/td> 424K
代理商: EVAL-AD7898CB
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
REV. 0
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.
a
Evaluation Board for 5V, 12-Bit, Serial
220kSPS ADC in 8-Pin Package
EVAL-AD7898CB
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Full-Featured Evaluation Board for the AD7898
EVALUATION-BOARD CONTROLLER Compatible
Stand Alone Capability
On-Board Analog Buffering and Reference
Various Linking Options
PC Software for Control and Data Analysis when used
with EVALUATION-BOARD CONTROLLER
Patchwork Area for User Expansion
INT RODUCT ION
T his T echnical Note describes the evaluation board for
the
AD7898 which is a fast 12-bit ADC that operates from a
single +5 V supply and is housed in an 8-pin SOIC.
Full data
on the AD7898 is available in the AD7898 data sheet
available from Analog Devices and should be consulted in
conjunction with this T echnical Note when using the
Evaluation Board.
On-board components include an AD780 which is a pin
programmable +2.5V or +3V ultra high precision
bandgap reference and an AD711 op-amp used to buffer
the analog input. T here are various link options which are
explained in detail on page 2.
Interfacing to this board is through a 96-way connector.
T his 96-way connector is compatible with the EVALUA-
T ION-BOARD C ONT ROL L ER which is also available
from Analog Devices. External sockets are provided for
the
CS/CONVST
input, VDRIVE input, SDAT A input,
SCLK input, REFIN input and the VIN input.
ad7898
EXTERNAL
REFERENCE
ANALOG
INPUT
CS
SDATA
SCLK
Vdd
Vdrive
Vdd
OPE R AT ING T HE AD 7898 E VAL UAT ION BOAR D
Power Supplies
When using this evaluation board with the EVALUA-
T ION-BOARD C ONT ROL L ER all supplies are pro-
vided from the EVAL UAT ION-BOARD
CONT ROL L ER through the 96 way connector.
When using the board as a stand alone unit external sup-
plies must be provided. T his evaluation board has seven
power supply inputs: V
DD
, A
GND
, +12V, -12V, A
GND
, and
V
DRIVE
. If the evaluation board is used in stand-alone
mode +5V must be connected to the V
DD
input to supply
the AD7898 V
DD
pin and the AD780 voltage reference.
+12V and -12V are used to supply the op-amps. T he
V
DRIVE
pin can be driven by a voltage between +3V and
+5V allowing the evaluation board to be connected to
both +3V and +5V systems. T he supplies are decoupled to
the relevant ground plane with 10μF tantalum and 0.1μF
multilayer ceramic capacitors at the point where they enter
the board. T he supply pins of all the op-amps and refer-
ence are also decoupled to A
GND
with 10μF tantalum and a
0.1μF ceramic capacitor. T he AD7898 AV
DD
supply pin is
decoupled to A
GND
with 10 μF tantalum and 0.1μF multi-
layer ceramic capacitors.
Extensive ground planes are used on this board to mini-
mize the effect of high frequency noise interference. T here
are two ground planes, A
GND
and D
GND
. T hese are con-
nected at one location close to the AD7898.
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