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AD7687BCPZ-R2 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7687BCPZ-R2 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 27 page 16-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP Data Sheet AD7687 Rev. E 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 rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithout 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 ©2005–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com 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 SNR: 95.5 dB at 20 kHz THD: −118 dB at 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 Proprietary serial interface: SPI/QSPI™/MICROWIRE/DSP compatible Daisy-chain multiple ADCs and BUSY indicator Power dissipation 1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS, and 1.4 μW at 2.5 V/100 SPS Standby current: 1 nA 10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP Pin-for-pin compatible with AD7685, AD7686, and AD7688 APPLICATIONS Battery-powered equipment Data acquisitions Instrumentation Medical instruments Process controls TYPICAL APPLICATION CIRCUIT AD7687 REF GND VDD IN+ IN– VIO SDI SCK SDO CNV 1.8V TO VDD 3- OR 4-WIRE INTERFACE (SPI, DAISY CHAIN, CS) 0.5V TO 5V 2.5 TO 5V VREF 0 VREF 0 Figure 1. GENERAL DESCRIPTION The AD76871 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 device also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, the AD7687 the samples the voltage difference between IN+ and IN− pins, which can range from −VREF to +VREF. The reference voltage, VREF, is applied externally and can be set up to the supply voltage. The power consumption of the device scales linearly with throughput. The SPI-compatible serial interface also features the ability to daisy-chain several ADCs on a single 3-wire bus and provides an optional BUSY indicator by means of the SDI pin. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate supply VIO. The AD7687 comes in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +85°C. Table 1. MSOP, 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 1 Protected by U.S. Patent 6,703,961. |
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