Datasheet AD7688 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 500 kSPS 16- BIT Differential PulSAR A/D Converter in µSOIC/QFN |
| Seiten / Seite | 29 / 1 — 16-Bit, 1.5 LSB INL, 500 kSPS PulSAR™. Differential ADC in MSOP/LFCSP. … |
| Revision | B |
| Dateiformat / Größe | PDF / 570 Kb |
| Dokumentensprache | Englisch |
16-Bit, 1.5 LSB INL, 500 kSPS PulSAR™. Differential ADC in MSOP/LFCSP. Data Sheet. AD7688. FEATURES. APPLICATION DIAGRAM
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16-Bit, 1.5 LSB INL, 500 kSPS PulSAR™ Differential ADC in MSOP/LFCSP Data Sheet AD7688 FEATURES APPLICATION DIAGRAM 16-bit resolution with no missing codes 0.5V TO 5V 5V Throughput: 500 kSPS INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR) Dynamic range: 96.5 dB VREF REF VDD VIO 1.8V TO VDD 0 SNR: 95.5 dB at 20 kHz SDI IN+ AD7688 SCK 3- OR 4-WIRE INTERFACE THD: −118 dB at 20 kHz IN– SDO (SPI, DAISY CHAIN, CS) True differential analog input range VREF GND CNV 0 ±VREF 0 V to VREF with VREF up to VDD on both inputs
02973-002
No pipeline delay
Figure 2.
Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Table 1. MSOP, LFCSP/SOT-23 16-Bit PulSAR ADC Proprietary serial interface Type 100 kSPS 250 kSPS 500 kSPS SPI®/QSPI™/MICROWIRE™/DSP-compatible1
True Differential AD7684 AD7687 AD7688
Daisy-chain multiple ADCs and BUSY indicator
Pseudo AD7683 AD7685 AD7686
Power dissipation
Differential/Unipolar AD7694
3.75 mW at 5 V/100 kSPS
Unipolar AD7680
3.75 µW at 5 V/100 SPS Standby current: 1 nA GENERAL DESCRIPTION 10-lead MSOP (MSOP-8 size) and 3 mm × 3 mm LFCSP (SOT-23 size)
The AD7688 is a 16-bit, charge redistribution, successive
Pin-for-pin compatible with AD7685, AD7686, and AD7687
approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power,
APPLICATIONS
high speed, 16-bit sampling ADC with no missing codes, an
Battery-powered equipment
internal conversion clock, and a versatile serial interface port.
Data acquisitions
The part also contains a low noise, wide bandwidth, short
Instrumentation
aperture delay track-and-hold circuit. On the CNV rising edge,
Medical instruments
it samples the voltage difference between IN+ and IN− pins.
Process controls
The voltages on these pins usually swing in opposite phase
1.5
between 0 V and REF. The reference voltage, REF, is applied
POSITIVE INL = +0.31LSB NEGATIVE INL = –0.39LSB
externally and can be set up to the supply voltage.
1.0
Its power scales linearly with throughput. 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
0
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate
INL (LSB)
supply VIO.
–0.5
The AD7688 is housed in a 10-lead MSOP or a 10-lead LFCSP
–1.0
with operation specified from −40°C to +85°C.
–1.5
02973-001
0 16384 32768 49152 65535 CODE
1 Protected by U.S. Patent 6,703,961. Figure 1. Integral Nonlinearity vs. Code
Rev. B 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 ©2005–2014 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 Diagram General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Input Driver Amplifier Choice Single-to-Differential Driver Voltage Reference Input Power Supply Supplying the ADC from the Reference Digital Interface /CS Mode 3-Wire, No BUSY Indicator /CS Mode 3-Wire with BUSY Indicator /CS Mode 4-Write, No BUSY Indicator /CS Mode 4-Wire with BUSY Indicator Chain Mode, No BUSY Indicator Chain Mode with BUSY Indicator Application Hints Layout Evaluating the AD7688 Performance Outline Dimensions Ordering Guide
16-Bit, 1.5 LSB INL, 500 kSPS PulSAR™ Differential ADC in MSOP/LFCSP Data Sheet AD7688 FEATURES APPLICATION DIAGRAM 16-bit resolution with no missing codes 0.5V TO 5V 5V Throughput: 500 kSPS INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR) Dynamic range: 96.5 dB VREF REF VDD VIO 1.8V TO VDD 0 SNR: 95.5 dB at 20 kHz SDI IN+ AD7688 SCK 3- OR 4-WIRE INTERFACE THD: −118 dB at 20 kHz IN– SDO (SPI, DAISY CHAIN, CS) True differential analog input range VREF GND CNV 0 ±VREF 0 V to VREF with VREF up to VDD on both inputs
02973-002
No pipeline delay
Figure 2.
Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Table 1. MSOP, LFCSP/SOT-23 16-Bit PulSAR ADC Proprietary serial interface Type 100 kSPS 250 kSPS 500 kSPS SPI®/QSPI™/MICROWIRE™/DSP-compatible1
True Differential AD7684 AD7687 AD7688
Daisy-chain multiple ADCs and BUSY indicator
Pseudo AD7683 AD7685 AD7686
Power dissipation
Differential/Unipolar AD7694
3.75 mW at 5 V/100 kSPS
Unipolar AD7680
3.75 µW at 5 V/100 SPS Standby current: 1 nA GENERAL DESCRIPTION 10-lead MSOP (MSOP-8 size) and 3 mm × 3 mm LFCSP (SOT-23 size)
The AD7688 is a 16-bit, charge redistribution, successive
Pin-for-pin compatible with AD7685, AD7686, and AD7687
approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power,
APPLICATIONS
high speed, 16-bit sampling ADC with no missing codes, an
Battery-powered equipment
internal conversion clock, and a versatile serial interface port.
Data acquisitions
The part also contains a low noise, wide bandwidth, short
Instrumentation
aperture delay track-and-hold circuit. On the CNV rising edge,
Medical instruments
it samples the voltage difference between IN+ and IN− pins.
Process controls
The voltages on these pins usually swing in opposite phase
1.5
between 0 V and REF. The reference voltage, REF, is applied
POSITIVE INL = +0.31LSB NEGATIVE INL = –0.39LSB
externally and can be set up to the supply voltage.
1.0
Its power scales linearly with throughput. 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
0
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate
INL (LSB)
supply VIO.
–0.5
The AD7688 is housed in a 10-lead MSOP or a 10-lead LFCSP
–1.0
with operation specified from −40°C to +85°C.
–1.5
02973-001
0 16384 32768 49152 65535 CODE
1 Protected by U.S. Patent 6,703,961. Figure 1. Integral Nonlinearity vs. Code
Rev. B 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 ©2005–2014 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 Diagram General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Input Driver Amplifier Choice Single-to-Differential Driver Voltage Reference Input Power Supply Supplying the ADC from the Reference Digital Interface /CS Mode 3-Wire, No BUSY Indicator /CS Mode 3-Wire with BUSY Indicator /CS Mode 4-Write, No BUSY Indicator /CS Mode 4-Wire with BUSY Indicator Chain Mode, No BUSY Indicator Chain Mode with BUSY Indicator Application Hints Layout Evaluating the AD7688 Performance Outline Dimensions Ordering Guide