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AD7674 Datasheet

  • AD7674

  • 18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC

  • 2487.32KB

  • 30頁

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18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
AD7679
FEATURES
18-bit resolution with no missing codes
No pipeline delay (SAR architecture)
Differential input range: 鹵V
REF
(V
REF
up to 5 V)
Throughput: 570 kSPS
INL: 鹵2.5 LSB max (鹵9.5 ppm of full scale)
Dynamic range : 103 dB typ (V
REF
= 5 V)
S/(N+D): 100 dB typ @ 2 kHz (V
REF
= 5 V)
Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface
SPI
廬
/QSPI
鈩?/div>
/MICROWIRE
鈩?/div>
/DSP compatible
On-board reference buffer
Single 5 V supply operation
Power dissipation: 76 mW @ 500 kSPS
150 碌W @ 1 kSPS
48-lead LQFP or 48-lead LFCSP package
Pin-to-pin compatible upgrade of AD7674/AD7676/AD7678
FUNCTIONAL BLOCK DIAGRAM
PDBUF
AGND
AVDD
REFBUFIN
IN+
IN鈥?/div>
SWITCHED
CAP DAC
PARALLEL
INTERFACE
CLOCK
PD
RESET
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
REF REFGND
DVDD DGND
OVDD
SERIAL
PORT
18
OGND
AD7679
D[17:0]
BUSY
RD
CS
MODE0
MODE1
CNVST
03085鈥?鈥?01
Figure 1. Functional Block Diagram
APPLICATIONS
CT scanners
High dynamic data acquisition
Geophone and hydrophone sensors
危-鈭?replacement (low power, multichannel)
Instrumentation
Spectrum analysis
Medical instruments
Table 1. PulSAR Selection
Type/kSPS
Pseudo-
Differential
True Bipolar
True
Differential
18-Bit
Multichannel/
Simultaneous
100鈥?50
AD7651
AD7660/AD7661
AD7663
AD7675
AD7678
500鈥?70
AD7650/AD7652
AD7664/AD7666
AD7665
AD7676
AD7679
AD7654
AD7655
800鈥?/div>
1000
AD7653
AD7667
AD7671
AD7677
AD7674
GENERAL DESCRIPTION
The AD7679 is an 18-bit, 570 kSPS, charge redistribution SAR,
fully differential analog-to-digital converter that operates on a
single 5 V power supply. The part contains a high speed 18-bit
sampling ADC, an internal conversion clock, an internal
reference buffer, error correction circuits, and both serial and
parallel system interface ports.
The part is available in a 48-lead LQFP or 48-lead LFCSP with
operation specified from 鈥?0擄C to +85擄C.
PRODUCT HIGHLIGHTS
1.
High Resolution, Fast Throughput.
The AD7679 is a 570 kSPS, charge redistribution, 18-bit
SAR ADC (no latency).
Excellent Accuracy.
The AD7679 has a maximum integral nonlinearity of
2.5 LSB with no missing 18-bit codes.
Serial or Parallel Interface.
Versatile parallel (18-, 16-, or 8-bit bus) or 3-wire serial
interface arrangement compatible with both 3 V and
5 V logic.
2.
3.
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
漏 2003 Analog Devices, Inc. All rights reserved.

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