Datasheet AD7685 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 16-Bit, 250 kSPS PulSAR® ADC in MSOP/QFN |
| Pages / Page | 29 / 1 — 16-Bit, 250 kSPS PulSAR. ADC in MSOP. Data Sheet. AD7685. FEATURES. … |
| Revision | D |
| File Format / Size | PDF / 549 Kb |
| Document Language | English |
16-Bit, 250 kSPS PulSAR. ADC in MSOP. Data Sheet. AD7685. FEATURES. TYPICAL APPLICATION CIRCUIT
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16-Bit, 250 kSPS PulSAR ADC in MSOP Data Sheet AD7685 FEATURES TYPICAL APPLICATION CIRCUIT 16-bit resolution with no missing codes 0.5V TO VDD 2.5V TO 5V Throughput: 250 kSPS INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR) SINAD: 93.5 dB at 20 kHz REF VDD VIO 1.8V TO VDD THD: −110 dB at 20 kHz 0 TO VREF SDI IN+ Pseudo differential analog input range AD7685 SCK 3- OR 4-WIRE INTERFACE IN– SDO (SPI, DAISY CHAIN, CS) 0 V to VREF with VREF up to VDD GND CNV No pipeline delay Single-supply operation 2.3 V to 5.5 V with
001
1.8 V to 5 V logic interface
02968- Figure 2.
Proprietary serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP- compatible Table 1. MSOP, LFCSP/SOT-23 14-/16-/18-Bit PulSAR ADC Daisy-chain multiple ADCs, BUSY indicator 400 kSPS Power dissipation 100 250 to 1000 ADC 1.4 µW at 2.5 V/100 SPS Type kSPS kSPS 500 kSPS kSPS Driver 1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS
18-Bit True AD7691 AD7690 AD7982 ADA4941 Differential AD7982 ADA4841
Standby current: 1 nA
16-Bit True AD7684 AD7687 AD7688 ADA4941
10-lead package: MSOP (MSOP-8 size) and
Differential AD7693 ADA4841
3 mm × 3 mm LFCSP (SOT-23 size)
16-Bit Pseudo AD7680 AD7685 AD7686 AD7980 ADA4841
Pin-for-pin-compatible with 10-lead MSOP/PulSAR® ADCs
Differential AD7683 AD7694
APPLICATIONS
14-Bit Pseudo AD7940 AD7942 AD7946 ADA4841 Differential
Battery-powered equipment Medical instruments GENERAL DESCRIPTION Mobile communications Personal digital assistants (PDAs)
The AD76851 is a 16-bit, charge redistribution successive
Data acquisition
approximation, analog-to-digital converter (ADC) that operates
Instrumentation
from a single power supply, VDD, between 2.3 V to 5.5 V. It
Process controls
contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial
2.0 POSITIVE INL = +0.33LSB
interface port. The part also contains a low noise, wide bandwidth,
NEGATIVE INL = –0.50LSB 1.5
short aperture delay, track-and-hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with
1.0
respect to a ground sense IN−. The reference voltage, REF, is
0.5
applied external y and can be set up to the supply voltage.
0
Power dissipation scales linearly with throughput.
INL (LSB) –0.5
The SPI-compatible serial interface also features the ability, using the SDI input, to daisy chain several ADCs on a single
–1.0
3-wire bus or provides an optional BUSY indicator. It is
–1.5
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate supply VIO.
–2.0 0 16384 32768 49152 65536
The AD7685 is housed in a 10-lead MSOP or a 10-lead LFCSP
CODE
02968-005 with operation specified from −40°C to +85°C. Figure 1. Integral Nonlinearity vs. Code 1 Protected by U.S. Patent 6,703,961.
Rev. D 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 ©2004–2014 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 Typical Application Circuit General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Theory of Operation Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Inputs Driver Amplifier Choice 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-Wire, 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 Performance of the AD7685 True 16-Bit Isolated Application Example Outline Dimensions Ordering Guide
16-Bit, 250 kSPS PulSAR ADC in MSOP Data Sheet AD7685 FEATURES TYPICAL APPLICATION CIRCUIT 16-bit resolution with no missing codes 0.5V TO VDD 2.5V TO 5V Throughput: 250 kSPS INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR) SINAD: 93.5 dB at 20 kHz REF VDD VIO 1.8V TO VDD THD: −110 dB at 20 kHz 0 TO VREF SDI IN+ Pseudo differential analog input range AD7685 SCK 3- OR 4-WIRE INTERFACE IN– SDO (SPI, DAISY CHAIN, CS) 0 V to VREF with VREF up to VDD GND CNV No pipeline delay Single-supply operation 2.3 V to 5.5 V with
001
1.8 V to 5 V logic interface
02968- Figure 2.
Proprietary serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP- compatible Table 1. MSOP, LFCSP/SOT-23 14-/16-/18-Bit PulSAR ADC Daisy-chain multiple ADCs, BUSY indicator 400 kSPS Power dissipation 100 250 to 1000 ADC 1.4 µW at 2.5 V/100 SPS Type kSPS kSPS 500 kSPS kSPS Driver 1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS
18-Bit True AD7691 AD7690 AD7982 ADA4941 Differential AD7982 ADA4841
Standby current: 1 nA
16-Bit True AD7684 AD7687 AD7688 ADA4941
10-lead package: MSOP (MSOP-8 size) and
Differential AD7693 ADA4841
3 mm × 3 mm LFCSP (SOT-23 size)
16-Bit Pseudo AD7680 AD7685 AD7686 AD7980 ADA4841
Pin-for-pin-compatible with 10-lead MSOP/PulSAR® ADCs
Differential AD7683 AD7694
APPLICATIONS
14-Bit Pseudo AD7940 AD7942 AD7946 ADA4841 Differential
Battery-powered equipment Medical instruments GENERAL DESCRIPTION Mobile communications Personal digital assistants (PDAs)
The AD76851 is a 16-bit, charge redistribution successive
Data acquisition
approximation, analog-to-digital converter (ADC) that operates
Instrumentation
from a single power supply, VDD, between 2.3 V to 5.5 V. It
Process controls
contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial
2.0 POSITIVE INL = +0.33LSB
interface port. The part also contains a low noise, wide bandwidth,
NEGATIVE INL = –0.50LSB 1.5
short aperture delay, track-and-hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with
1.0
respect to a ground sense IN−. The reference voltage, REF, is
0.5
applied external y and can be set up to the supply voltage.
0
Power dissipation scales linearly with throughput.
INL (LSB) –0.5
The SPI-compatible serial interface also features the ability, using the SDI input, to daisy chain several ADCs on a single
–1.0
3-wire bus or provides an optional BUSY indicator. It is
–1.5
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate supply VIO.
–2.0 0 16384 32768 49152 65536
The AD7685 is housed in a 10-lead MSOP or a 10-lead LFCSP
CODE
02968-005 with operation specified from −40°C to +85°C. Figure 1. Integral Nonlinearity vs. Code 1 Protected by U.S. Patent 6,703,961.
Rev. D 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 ©2004–2014 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 Typical Application Circuit General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Theory of Operation Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Inputs Driver Amplifier Choice 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-Wire, 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 Performance of the AD7685 True 16-Bit Isolated Application Example Outline Dimensions Ordering Guide
