2103-芯片资料介绍.PDF
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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
AD7723
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., 1998
16-Bit, 1.2 MSPS
CMOS, Sigma-Delta ADC
FUNCTIONAL BLOCK DIAGRAM
AGND
AV
DD
DGND
VIN(+)
VIN(–)
REF2
XTAL
CLKIN
MODE 1
STBY
SYNC
CFMT/RD
DGND/DRDY
DGND/
DB1
DOE/
DB4
SFMT/
DB5
FSI/
DB6
SCO/
DB7
MODULATOR
FIR
FILTER
XTAL
CLOCK
AD7723
DGND/
DB2
DGND/
DB3
SDO/
DB8
DGND/DB0
CONTROL
LOGIC
DV
DD
/CS
MODE 2
HALF_PWR
UNI
DGND/DB14
DGND/DB15
SCR/DB13
SLDR/DB12
SLP/DB11
TSI/DB10
FSO/DB9
XTAL_OFF
2.5V
REFERENCE
REF1
DV
DD
FEATURES
16-Bit Sigma-Delta ADC
1.2 MSPS Output Word Rate
32/16 3 Oversampling Ratio
Low-Pass and Band-Pass Digital Filter
Linear Phase
On-Chip 2.5 V Voltage Reference
Standby Mode
Flexible Parallel or Serial Interface
Crystal Oscillator
Single +5 V Supply
GENERAL DESCRIPTION
The AD7723 is a complete 16-bit, sigma-delta ADC. The part
operates from a +5␣ V supply. The analog input is continuously
sampled, eliminating the need for an external sample-and-hold.
The modulator output is processed by a finite impulse response
(FIR) digital filter. The on-chip filtering combined with a high
oversampling ratio reduces the external antialias requirements
to first order in most cases. The digital filter frequency response
can be programmed to be either low pass or band pass.
The AD7723 provides 16-bit performance for input bandwidths
up to 460␣ kHz at an output word rate up to 1.2 MHz. The
sample rate, filter corner frequencies and output word rate are
set by the crystal oscillator or external clock frequency.
Data can be read from the device in either serial or parallel
format. A stereo mode allows data from two devices to share a
single serial data line. All interface modes offer easy, high speed
connections to modern digital signal processors.
The part provides an on-chip 2.5␣ V reference. Alternatively, an
external reference can be used.
A power-down mode reduces the idle power consumption to
200 µW.
The AD7723 is available in a 44-lead PQFP package and is
specified over the industrial temperature range from –40°C to
+85°C.
Two input modes are provided, allowing both unipolar and
bipolar input ranges.
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