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Analog Devices - Dual CMOS Modulators

Numéro de référence AD7724
Description Dual CMOS Modulators
Fabricant Analog Devices 
Logo Analog Devices 





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AD7724 fiche technique
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Dual CMOS -Modulators
AD7724
FEATURES
13 MHz Master Clock Frequency
0 V to +2.5 V or ؎1.25 V Input Range
Single Bit Output Stream
90 dB Dynamic Range
Power Supplies
AVDD, DVDD: 5 V␣ ؎ 5%
DVDD1: 3 V ؎ 5%
Logic Outputs 3 V/5 V Compatible
On-Chip 2.5 V Voltage Reference
48-Lead LQFP
GENERAL DESCRIPTION
This device consists of two seventh order sigma-delta modula-
tors. Each modulator converts its analog input signal into a high
speed 1-bit data stream. The part operates from a 5 V power
supply and accepts a differential input range of 0 V to +2.5 V or
±1.25 V centered about a common-mode bias. The analog inputs
are continuously sampled by the analog modulators, eliminating
the need for external sample-and-hold circuitry. The input infor-
mation is contained in the output stream as a density of ones.
The original information can be digitally reconstructed with an
appropriate digital filter.
The part provides an accurate on-chip 2.5 V reference for each
modulator. A reference input/output function is provided to
allow either the internal reference or an external system refer-
ence to be used as the reference source for the modulator.
The device is offered in a 48-lead LQFP package and designed
to operate from –40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
REF1 REF2A REF2B
2.5V
REFERENCE
AD7724
AVIN(+)
AVIN(–)
BVIN(+)
BVIN(–)
MZERO
GC
BIP
STBY
RESET
-
MODULATOR A
-
MODULATOR B
CONTROL
LOGIC
CLOCK
CIRCUITRY
ADATA
SCLK
BDATA
XTAL OFF
XTAL1
XTAL2/MCLK
DVAL
DVDD DVDD1 DGND
AVDD AGND
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: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000

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