900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Analog Devices Semiconductor Electronic Components Datasheet

AD7687 Datasheet

Differential ADC

No Preview Available !

Data Sheet
16-Bit, 1.5 LSB INL, 250 kSPS PulSAR™
Differential ADC in MSOP/QFN
AD7687
FEATURES
16-bit resolution with no missing codes
Throughput: 250 kSPS
INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)
Dynamic range: 96.5 dB
S/(N + D): 95.5 dB @ 20 kHz
THD: −118 dB @ 20 kHz
True differential analog input range
±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 2.3 V to 5.5 V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
Daisy-chain multiple ADCs and BUSY indicator
Power dissipation
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS, and
1.4 μW @ 2.5 V/100 SPS
Standby current: 1 nA
10-lead MSOP (MSOP-8 size) and
3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
Pin-for-pin compatible with AD7685, AD7686, and AD7688
APPLICATIONS
Battery-powered equipment
Data acquisitions
Instrumentation
Medical instruments
Process controls
1.5
1.0
POSITIVE INL = +0.32LSB
NEGATIVE INL = –0.41LSB
0.5
0
–0.5
–1.0
–1.5
0
16384
32768
CODE
49152
Figure 1. Integral Nonlinearity vs. Code
65535
APPLICATION DIAGRAM
0.5V TO 5V 2.5 TO 5V
VREF
0
VREF
0
REF VDD VIO
SDI
IN+
AD7687 SCK
IN– SDO
GND
CNV
1.8V TO VDD
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
Figure 2.
Table 1. MSOP, QFN (LFCSP)/SOT-23 16-Bit PulSAR ADC
Type
100 kSPS 250 kSPS 500 kSPS
True Differential
AD7684
AD7687
AD7688
Pseudo
AD7683
AD7685
AD7686
Differential/Unipolar
AD7694
Unipolar
AD7680
GENERAL DESCRIPTION
The AD7687 is a 16-bit, charge redistribution, successive
approximation, analog-to-digital converter (ADC) that operates
from a single power supply, VDD, between 2.3 V to 5.5 V. It
contains a low power, high speed, 16-bit sampling ADC with no
missing codes, an internal conversion clock, and a versatile
serial interface port. The part also contains a low noise, wide
bandwidth, short aperture delay track-and-hold circuit. On the
CNV rising edge, it samples the voltage difference between IN+
and IN− pins. The voltages on these pins usually swing in
opposite phase between 0 V to REF. The reference voltage, REF,
is applied externally and can be set up to the supply voltage.
Its power scales linearly with throughput.
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 provides an optional BUSY indicator. It is
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate
supply VIO.
The AD7687 is housed in a 10-lead MSOP or a 10-lead QFN
(LFCSP) with operation specified from −40°C to +85°C.
Rev. B
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.
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 ©2005–2011 Analog Devices, Inc. All rights reserved.
Free Datasheet http://www.datasheet4u.com/


Analog Devices Semiconductor Electronic Components Datasheet

AD7687 Datasheet

Differential ADC

No Preview Available !

AD7687
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Application Diagram........................................................................ 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Timing Specifications....................................................................... 5 
Absolute Maximum Ratings............................................................ 7 
Thermal Resistance ...................................................................... 7 
ESD Caution.................................................................................. 7 
Pin Configurations and Function Descriptions ........................... 8 
Terminology ...................................................................................... 9 
Typical Performance Characteristics ........................................... 10 
Circuit Information.................................................................... 13 
Converter Operation.................................................................. 13 
Typical Connection Diagram ................................................... 14 
Analog Input ............................................................................... 15 
REVISION HISTORY
8/11—Rev. A to Rev. B
Changes to Table 7............................................................................ 7
Changes to Ordering Guide .......................................................... 26
2/11—Rev. 0 to Rev. A
Deleted QFN in Development Note............................ Throughout
Changes to Table 6............................................................................ 7
Added Thermal Resistance Section and Table 7 .......................... 7
Changes to Figure 6 and Table 8..................................................... 8
Updated Outline Dimensions ....................................................... 25
Changes to Ordering Guide .......................................................... 26
4/05—Revision 0: Initial Version
Data Sheet
Driver Amplifier Choice ........................................................... 16 
Single-to-Differential Driver .................................................... 16 
Voltage Reference Input ............................................................ 16 
Power Supply............................................................................... 16 
Supplying the ADC from the Reference.................................. 17 
Digital Interface.......................................................................... 17 
CS MODE 3-Wire, No BUSY Indicator .................................. 18 
CS Mode 3-Wire with BUSY Indicator ................................... 19 
CS Mode 4-Wire, No BUSY Indicator..................................... 20 
CS Mode 4-Wire with BUSY Indicator ................................... 21 
Chain Mode, No BUSY Indicator ............................................ 22 
Chain Mode with BUSY Indicator........................................... 23 
Application Hints ........................................................................... 24 
Layout .......................................................................................... 24 
Evaluating the AD7687’s Performance.................................... 24 
Outline Dimensions ....................................................................... 25 
Ordering Guide .......................................................................... 26 
Rev. B | Page 2 of 28
Free Datasheet http://www.datasheet4u.com/


Part Number AD7687
Description Differential ADC
Maker Analog Devices
Total Page 28 Pages
PDF Download

AD7687 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 AD768 16-Bit/ 30 MSPS D/A Converter
Analog Devices
2 AD7680 3mW + 100kSPS - 16-Bit ADC
Analog Devices
3 AD7682 16-Bit - 4-Channel/8-Channel - 250 kSPS PulSAR ADC
Analog Devices
4 AD7683 16-Bit / 100 kSPS PulSAR ADC
Analog Devices
5 AD7684 16-Bit - 100 kSPS PulSAR Differential ADC
Analog Devices
6 AD7685 250 kSPS PulSAR ADC
Analog Devices
7 AD7686 500 kSPS PulSAR ADC
Analog Devices
8 AD7687 Differential ADC
Analog Devices
9 AD7688 Differential ADC
Analog Devices





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy