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AD7641 데이터시트(PDF) 1 Page - Analog Devices

부품명 AD7641
상세설명  18-Bit, 2 MSPS SAR ADC
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18-Bit, 2 MSPS SAR ADC
AD7641
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Throughput
2 MSPS (wideband warp and warp mode)
1.5 MSPS (normal mode)
INL: ±2 LSB typical, ±3 LSB max; ±8 ppm of full scale
18-bit resolution with no missing codes
Dynamic range: 95.5 dB
SNR: 93.5 dB typical @ 20 kHz (VREF = 2.5 V)
THD: −112 dB typical @ 20 kHz (VREF = 2.5 V)
2.048 V internal reference: typ drift 10 ppm/°C; TEMP output
Differential input range: ±VREF (VREF up to 2.5 V)
No pipeline delay (SAR architecture)
Parallel (18-, 16-, or 8-bit bus) and
serial 5 V/3.3 V/2.5 V interface
SPI®/QSPI™/MICROWIRE™/DSP compatible
Single 2.5 V supply operation
Power dissipation
75 mW typical @ 2 MSPS with internal REF
2 μW in power-down mode
Pb-free, 48-lead LQFP and 48-lead LFCSP_VQ
Speed upgrade of the AD7674, AD7678, AD7679
APPLICATIONS
Medical instruments
High speed data acquisition/high dynamic data acquisition
Digital signal processing
Spectrum analysis
Instrumentation
Communications
ATE
GENERAL DESCRIPTION
The AD7641 is an 18-bit, 2 MSPS, charge redistribution SAR,
fully differential, analog-to-digital converter (ADC) that
operates from a single 2.5 V power supply. The part contains a
high speed, 18-bit sampling ADC, an internal conversion clock,
an internal reference (and buffer), error correction circuits, and
both serial and parallel system interface ports. It features two
very high sampling rate modes (wideband warp and warp) and
a fast mode (normal) for asynchronous rate applications. The
AD7641 is hardware factory calibrated and tested to ensure ac
parameters, such as signal-to-noise ratio (SNR), in addition to
the more traditional dc parameters of gain, offset, and linearity.
The AD7641 is available in Pb-free only packages with
operation specified from −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
18
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7641
DGND
DVDD
AVDD
AGND
REF REFGND
IN+
IN–
PD
RESET
CNVST
PDBUF
REFBUFIN
PDREF
REF
TEMP
D[17:0]
BUSY
RD
CS
D0/OB/2C
OGND
OVDD
MODE1
MODE0
REF AMP
NORMAL
SERIAL
PORT
PARALLEL
INTERFACE
SWITCHED
CAP DAC
WARP
Figure 1.
Table 1. PulSAR® Selection
Type/kSPS
100 to
250
500 to
570
650 to
1000
>1000
Pseudo
Differential
AD7651,
AD7660,
AD7661
AD7650,
AD7652,
AD7664,
AD7666
AD7653,
AD7667
True Bipolar
AD7610,
AD7663
AD7665
AD7612,
AD7671
True
Differential
AD7675
AD7676
AD7677
AD7621,
AD7622,
AD7623
18-Bit
Multichannel/
AD7631,
AD7678
AD7679
AD7634,
AD7674
AD7641,
AD7643
Simultaneous
AD7654
AD7655
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7641 is a 2 MSPS, charge redistribution,
18-bit SAR ADC.
2. Superior Linearity.
The AD7641 has no missing 18-bit code.
3. Internal Reference.
The AD7641 has a 2.048 V internal reference with a typical
-chip TEMP sensor.
drift of ±10 ppm/°C and an on
Single-Supply Operation.
4.
2.5 V single supply.
5.
ace
arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.
The AD7641 operates from a
Serial or Parallel Interface.
Versatile parallel (16- or 8-bit bus) or 2-wire serial interf


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