Datasheet AD7690 (Analog Devices)

18-Bit, 1.5 LSB INL, 400 kSPS PulSAR® Differential ADC in MSOP/LFCSP Data Sheet AD7690 FEATURES APPLICATION EXAMPLE +2.5V TO +5V +5V 18-bit resolution with no missing codes Throughput: 400 kSPS INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR) Dynamic range: 102 dB at 400 kSPS REF VDD VIO +1.8V TO VDD IN+ SDI Oversampled dynamic range: 125 dB at 1 kSPS SCK 3- OR 4-WIRE Noise-free code resolution: 20 bits at 1 kSPS ±10V, ±5V, ... INTERFACE IN– SDO (SPI, DAISY CHAIN, CS) GND Effective resolution: 22.7 bits at 1 kSPS CNV ADA4941-1 SINAD: 101.5 dB at 1 kHz
-001
AD7690
792
THD: −125 dB at 1 kHz
05 Figure 2.
True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs Table 1. MSOP, LFCSP/SOT-23 14-/16-/18-Bit PulSAR ADC No pipeline delay 400 kSPS Single-supply 5 V operation with 100 250 to 1000 ADC 1.8 V/2.5 V/3 V/5 V logic interface Type kSPS kSPS 500 kSPS kSPS Driver
18-Bit True AD7691 AD7690 AD7982 ADA4941
Proprietary serial interface
Differential AD7982 ADA4841
SPI/QSPI/MICROWIRE™/DSP compatible
16-Bit True AD7684 AD7687 AD7688 ADA4941
Daisy-chain multiple ADCs and busy indicator
Differential AD7693 ADA4841
Power dissipation
16-Bit Pseudo AD7680 AD7685 AD7686 AD7980 ADA4841
4.25 μW at 100 SPS
Differential AD7683 AD7694
4.25 mW at 100 kSPS
14-Bit Pseudo AD7940 AD7942 AD7946 ADA4841 Differential
Standby current: 1 nA 10-lead package: MSOP (MSOP-8 size) and 3 mm × 3 mm LFCSP (SOT-23 size) GENERAL DESCRIPTION Pin-for-pin compatible with LFCSP/MSOP PulSAR ADCs
The AD76901 is an 18-bit, successive approximation, analog-to-
APPLICATIONS
digital converter (ADC) that operates from a single power supply,
Battery-powered equipment
VDD. It contains a low power, high speed, 18-bit sampling ADC
Data acquisition
with no missing codes, an internal conversion clock, and a
Seismic data acquisition systems
versatile serial interface port. On the CNV rising edge, it
DVMs
samples the voltage difference between the IN+ and IN− pins.
Instrumentation
The voltages on these pins swing in opposite phase between 0 V
Medical instruments
and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.
1.5 POSITIVE INL = +0.42LSB NEGATIVE INL = –0.6LSB
The power of the AD7690 scales linearly with the throughput.
1.0
The SPI-compatible serial interface also features the ability,
0.5
using the SDI input, to daisy-chain several ADCs on a single,
)
3-wire bus and provides an optional busy indicator. It is compatible
B S L 0
with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.
L ( IN
The AD7690 is housed in a 10-lead MSOP or a 10-lead LFCSP
–0.5
with operation specified from −40°C to +85°C.
–1.0
1 Protected by U.S. Patent 6,703,961.
–1.5 0 65536 131072 196608 262144
025
CODE
05792- Figure 1. Integral Nonlinearity vs. Code
Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2006–2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS APPLICATION EXAMPLE GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE SINGLE-TO-DIFFERENTIAL DRIVER VOLTAGE REFERENCE INPUT POWER SUPPLY SUPPLYING THE ADC FROM THE REFERENCE DIGITAL INTERFACE CS MODE, 3-WIRE WITHOUT BUSY INDICATOR CS MODE, 3-WIRE WITH BUSY INDICATOR CS MODE, 4-WIRE WITHOUT BUSY INDICATOR CS MODE, 4-WIRE WITH BUSY INDICATOR CHAIN MODE WITHOUT BUSY INDICATOR CHAIN MODE WITH BUSY INDICATOR APPLICATION HINTS LAYOUT EVALUATING THE AD7690 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE