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Analog Devices - 1.25 MSPS PulSAR ADC

Numéro de référence AD7643
Description 1.25 MSPS PulSAR ADC
Fabricant Analog Devices 
Logo Analog Devices 





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AD7643 fiche technique
18-Bit, 1.25 MSPS PulSAR ADC®www.DataSheet4U.com
AD7643
FEATURES
Throughput: 1.25 MSPS
INL: ±1.5 LSB typical, ±3 LSB maximum (±11 ppm of full scale)
18-bit resolution with no missing codes
Dynamic range: 95 dB typical
SINAD: 93.5 dB typical @ 20 kHz (VREF = 2.5 V)
THD: −113 dB typical @ 20 kHz (VREF = 2.5 V)
2.048 V internal reference: typical drift 8 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
65 mW typical @ 1.25 MSPS with internal REF
2 μW in power-down mode
Pb-free, 48-lead LQFP and 48-lead LFCSP_VQ
Pin compatible with the AD7641 and other PulSAR ADC’s
APPLICATIONS
Medical instruments
High speed data acquisition/high dynamic data acquisition
Digital signal processing
Spectrum analysis
Instrumentation
Communications
ATE
GENERAL DESCRIPTION
The AD7643 is an 18-bit, 1.25 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. The part has no
latency and can be used in asynchronous rate applications. The
AD7643 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 AD7643 is only available in Pb-free packages with
operation specified from −40°C to +85°C.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND
DVDD DGND
AGND
AVDD
IN+
IN–
PDREF
PDBUF
PD
RESET
REF
REF AMP
SWITCHED
CAP DAC
AD7643
SERIAL
PORT 18
PARALLEL
INTERFACE
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
OVDD
OGND
D[17:0]
MODE0
MODE1
BUSY
RD
CS
D0/OB/2C
CNVST
Figure 1.
Table 1. PulSAR 48-Lead Selection
Type/kSPS
100 to
250
500 to
570
Pseudo
Differential
AD7651,
AD7660,
AD7661
AD7650,
AD7652,
AD7664,
AD7666
True Bipolar
AD7610, AD7665
AD7663
True
Differential
AD7675 AD7676
18-Bit
Multichannel/
Simultaneous
AD7631,
AD7678
AD7679
AD7654
650 to
1000
AD7653,
AD7667
AD7612,
AD7671
AD7677
AD7634,
AD7674
AD7655
>1000
AD7621,
AD7622,
AD7623
AD7641,
AD7643
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7643 is a 1.25 MSPS, charge redistribution,
18-bit SAR ADC.
2. Superior Linearity.
The AD7643 has no missing 18-bit code.
3. Internal Reference.
The AD7643 has a 2.048 V internal reference with a typical
drift of ±8 ppm/°C and an on-chip TEMP sensor.
4. Single-Supply Operation.
The AD7643 operates from a 2.5 V single supply.
5. Serial or Parallel Interface.
Versatile parallel (18-, 16-, or 8-bit bus) or 2-wire serial
interface arrangement compatible with 2.5 V, 3.3 V, or
5 V logic.
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.

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