AD7882_15 Datasheet, PDF (1/12 Pages) Analog Devices – LC MOS 16 BIT 300 KSPS SAMPLING ADC

ANALOGDEVICES FAX-ON-DEMANDHOTLINE
2
ANALOG
W DEVICES
LC2MOS
16- Bit,300 ksps,SamplingADC
I ^{PreliminarTyechnicaDl ata}
AD7882I
FEATURES
300 ksps Throughput Rate
16-Bit Sampling ADC
FUNCTIONAL BLOCK DIAGRAM
Self-Calibration
High-Speed Parallel Interface
C>EF1 CREF>
DVDD
A'N
90 dB Signal-to-Noise Ratio
VREFI
Low Power: 200 mW typ
500 ~IW typ in power-down mode
OBSOLETE Unipolar and Bipolar Input Signal Ranges
On-Chip 2.5 V Reference
Operates from :t5V supplies
APPLICA TIONS
Data Acquisition Systems
Digital signal processing
Spectrum Analysis
DSP Servo Control
CLKlN
GENERAL DESCRIPTION
The AD7882 is a fast, 16-bit self-calibrating AID converter.
It consists of a sample-and-hold amplifier, a self calibrating
16-bit ADC, a 2.5 V reference and versatile interface logic.
An on-chip controller manages the self-calibrating algorithm
M/S St!!I" ~ elP/up CONVST BUSY
De..
Dea AVSS
AVDD
VREFOUT
AGND
DGND
PiD
W1I
which reduces linearity, offset and gain errors to :!:.0015 %.
System offset and gain errors, caused by external conditioning
circuitry, can also be included in the calibration procedure.
Throughput is maximized at 300 ksps by the use of a dual
sample-and-hold amplifier. The ADC also has a self-
contained internal dock which is laser trimmed to guarantee
PRODUCT HIGHLIGHTS
1. Fast 300 ksps Throughput Rate.
A fast 300 ksps throughput rate makes the AD7882 suitable
for a wide range of data acquisition applications.
accurate control of conversion time; alternatively, an external
2. Self-calibration Achieves High Accuracy
dock may be used.
A Self-calibrating algorithm minimizes linearity, offset and
Another featUre of the AD7882 is a power-down mode which
reduces power dissipation from its normal operating value of
200 mW to 0.5 mW.
gain errors. The calibration procedure can also include
external offset and gain errors.
3. Dynamic Specifications for DSP users.
The AD7882 operates from :!:5 V supplies. Analog input
ranges can be unipolar, 0 to 2.5 V or bipolar, :!:2.5 V. The
analog input bandwidth is 200 kHz.
In addition to traditional dc accuracy specifications such as
linearity, the AD7882 is also fully specified for dynamic per-
formance parameters induding harmonic distortion and
signal-to-noise ratio (SNR).
In addition to traditional dc specifications, the AD7882 is
specified for ac parameters including signal-to-noise ratio
and harmonic distortion. These parameters along with im-
portant timing parameters are tested on every device.
4. Fast, Versatile Microprocessor Interface.
Fast bus access times and standard control signals make
the AD7882 easy to interface to microprocessors.
The AD7882 is fabricated in Analog Devices' Linear Compat-
ible CMOS (LC2MOS), an advanced, mixed technology proc-
ess that combines precision bipolar circuits with low-power
5. Low Power.
Low power monolithic solution allows ease of application.
The AD7882 also has a power down facility
high-speed CMOS logic. The part is available in a 44-pin
plastic quad flat pack (PQFP) and 40-pin cerdip.
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.
Tel: [phone]
MA 02062-9106, U.S.A.
Fax: [phone]
Prelim.F3/95