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AD7985 датащи(PDF) 1 Page - Analog Devices

номер детали AD7985
подробное описание детали  16-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7985 датащи(HTML) 1 Page - Analog Devices

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16-Bit, 2.5 MSPS, PulSAR
15.5 mW ADC in LFCSP
Data Sheet
AD7985
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
©2009–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
16-bit resolution with no missing codes
Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
Low power dissipation
15.5 mW at 2.5 MSPS, with external reference
28 mW at 2.5 MSPS, with internal reference
INL: ±0.7 LSB typical, ±1.5 LSB maximum
SNR
88.5 dB, with on-chip reference
90 dB, with external reference
4.096 V internal reference: typical drift of ±10 ppm/°C
Pseudo differential analog input voltage range
0 V to VREF with VREF up to 5.0 V
Allows use of any input range
No pipeline delay
Logic interface: 1.8 V/2.5 V/2.7 V
Proprietary serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-
compatible1
Ability to daisy-chain multiple ADCs with busy indicator
20-lead, 4 mm × 4 mm LFCSP
APPLICATIONS
Battery-powered equipment
Communications
ATE
Data acquisition systems
Medical instruments
APPLICATION DIAGRAM
0V
TO
VREF
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
AD7985
GND
REF
AVDD,
DVDD
VIO
BVDD
5V
2.5V
1.8V
TO
2.7V
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE
INTERFACE:
SPI, CS,
DAISY CHAIN
(TURBO = LOW)
TURBO
10µF
IN+
IN–
Figure 1.
GENERAL DESCRIPTION
The AD79851 is a 16-bit, 2.5 MSPS successive approximation
analog-to-digital converter (SAR ADC). It contains a low power,
high speed, 16-bit sampling ADC, an internal conversion clock,
an internal reference (and buffer), error correction circuits, and
a versatile serial interface port. On the rising edge of CNV, the
AD7985 samples an analog input, IN+, between 0 V and REF
with respect to a ground sense, IN−. The AD7985 features a
very high sampling rate turbo mode (TURBO is high) and a
reduced power normal mode (TURBO is low) for low power
applications where the power is scaled with the throughput.
In normal mode (TURBO is low), the SPI-compatible serial inter-
face also features the ability, using the SDI input, to daisy-chain
several ADCs on a single 3-wire bus and provide an optional busy
indicator. It is compatible with 1.8 V, 2.5 V, and 2.7 V supplies
using the separate VIO supply.
The AD7985 is available in a 20-lead LFCSP with operation
specified from −40°C to +85°C.
1 Protected by U. S. Patent 6,703,961.
Table 1. MSOP, LFCSP, 14-/16-/18-Bit PulSAR® ADCs1
Type
100 kSPS
250 kSPS
400 kSPS to 500 kSPS
≥1000 kSPS
ADC Driver
14-Bit
AD7940
AD79422
AD79462
16-Bit
AD7680
AD76852
AD76862
AD79802
ADA4941-1
AD7683
AD76872
AD76882
AD79832
ADA4841-1
AD7684
AD7694
AD76932
AD79853
AD8021
18-Bit
AD76912
AD76902
AD79822
ADA4941-1
AD79842
ADA4841-1
AD79863
AD8021
1 See www.analog.com for the latest selection of PulSAR ADCs and ADC drivers.
2 Pin for pin compatible with all other devices marked with this endnote.
3 The AD7985 and AD7986 are pin for pin compatible.


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