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AD7986 датащи(PDF) 1 Page - Analog Devices

номер детали AD7986
подробное описание детали  15 mW ADC in LFCSP
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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18-Bit, 2 MSPS, PulSAR
15 mW ADC in LFCSP
Data Sheet
AD7986
Rev. D
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
18-bit resolution with no missing codes
Throughput: 2 MSPS (TURBO = high), 1.5 MSPS (TURBO = low)
Low power dissipation
15 mW at 2 MSPS, with external reference
26 mW at 2 MSPS with internal reference
INL: ±1 LSB typical, ±2.5 LSB maximum
SNR
95.5 dB, with on-chip reference
97.0 dB, with external reference
4.096 V internal reference: typical drift of 10 ppm/°C
True differential analog input voltage range: ±VREF
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-
compatible
Ability to daisy-chain multiple ADCs with busy indicator
20-lead 4 mm × 4 mm LFCSP
APPLICATIONS
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems
TYPICAL APPLICATION CIRCUIT
1.5nF
10Ω
V–
0V
TO
VREF
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
V+
1.5nF
10Ω
V–
V+
IN–
AD7986
IN+
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
VREF
TO
0V
GND
Figure 1.
GENERAL DESCRIPTION
The AD79861 is an 18-bit, 2 MSPS successive approximation,
analog-to-digital converter (ADC). It contains a low power,
high speed, 18-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
AD7986 samples the voltage difference between the IN+ and
IN− pins. The voltages on these pins usually swing in opposite
phases between 0 V and VREF. It features a very high sampling
rate turbo mode (TURBO = high) and a reduced power normal
mode (TURBO = low) for low power applications where the
power is scaled with the throughput.
In normal mode (TURBO = low), the SPI-compatible serial
interface 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 using the
separate VIO supply.
The AD7986 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® ADCs
Type
100 kSPS
250 kSPS
400 kSPS to 500 kSPS
≥1000 kSPS
ADC Driver
14-Bit
AD7940
AD79421
AD79461
16-Bit
AD7680
AD76851
AD76861
AD79801
ADA4941-1
AD7683
AD76871
AD76881
AD79831
ADA4841-1
AD7684
AD7694
AD76931
18-Bit
AD76911
AD76901
AD79821
ADA4941-1
AD79841
ADA4841-1
AD7986
AD8021
1 Pin for pin compatible.


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