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參數(shù)資料
型號: AD7720BRU
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: CMOS Sigma-Delta Modulator
中文描述: 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: TSSOP-28
文件頁數(shù): 1/16頁
文件大小: 232K
代理商: AD7720BRU
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
AD7720
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1997
CMOS Sigma-Delta Modulator
FUNCT IONAL BLOCK DIAGRAM
FEATURES
12.5 MHz Master Clock Frequency
0 V to +2.5 V or
6
1.25 V Input Range
Single Bit Output Stream
90 dB Dynamic Range
Power Supplies: AVDD, DVDD: +5 V
6
5%
On-Chip 2.5 V Voltage Reference
28-Lead TSSOP
GE NE RAL DE SCRIPT ION
T his device is a 7th order sigma-delta modulator that converts
the analog input signal into a high speed 1-bit data stream. T he
part operates from a +5 V supply and accepts a differential input
range of 0 V to +2.5 V or
±
1.25 V centered about a common-
mode bias. T he analog input is continuously sampled by the
analog modulator, eliminating the need for external sample and
hold circuitry. T he input information is contained in the output
stream as a density of ones. T he original information can be
reconstructed with an appropriate digital filter.
T he part provides an accurate on-chip 2.5 V reference. A refer-
ence input/output function is provided to allow either the inter-
nal reference or an external system reference to be used as the
reference source for the part.
T he device is offered in a 28-lead T SSOP package and designed
to operate from –40
°
C to +85
°
C.
2.5V
REFERENCE
SIGMA-DELTA
MODULATOR
CLOCK
CIRCUITRY
CONTROL
LOGIC
AVDD
AGND
DVDD
DGND
REF1
REF2
DATA
SCLK
XTAL1/MCLK
XTAL2
DVAL
RESETO
RESET
VIN(+)
VIN(–)
MZERO
GC
BIP
STBY
AD7720
相關(guān)PDF資料
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