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AD7680 데이터시트(PDF) 1 Page - Analog Devices |
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AD7680 데이터시트(HTML) 1 Page - Analog Devices |
1 / 29 page Dual Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP Data Sheet AD7903 Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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 ©2013–2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 16-bit resolution with no missing codes Throughput: 1 MSPS Low power dissipation 7.0 mW at 1 MSPS (VDD1 and VDD2 only) 12.0 mW at 1 MSPS (total) 140 µW at 10 kSPS INL: ±0.5 LSB typical, ±2.0 LSB maximum SINAD: 93.5 dB at 1 kHz THD: −112 dB at 1 kHz True differential analog input range: ±VREF 0 V to VREF with VREF between 2.4 V to 5.1 V Allows use of any input range Easy to drive with the ADA4941-1 No pipeline delay Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Serial port interface (SPI)/QSPI/MICROWIRE/DSP compatible 20-lead QSOP package Wide operating temperature range: −40°C to +125°C APPLICATIONS Battery-powered equipment Communications Automated test equipment (ATE) Data acquisition Medical instrumentation Redundant measurement Simultaneous sampling GENERAL DESCRIPTION The AD7903 is a dual 16-bit, successive approximation, analog- to-digital converter (ADC) that operates from a single power supply, VDDx, per ADC. It contains two low power, high speed, 16-bit sampling ADCs and a versatile serial port interface (SPI). On the CNVx rising edge, the AD7903 samples the voltage difference between the INx+ and INx− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput. Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIOx supplies. The AD7903 is available in a 20-lead QSOP package with operation specified from −40°C to +125°C. Table 1. MSOP 14-/16-/18-Bit PulSAR® ADCs Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS 1000 kSPS ADC Driver 18 AD76911 AD76901 AD79821 ADA4941-1 ADA4841-x 16 AD7680 AD76851 AD76861 AD79801 ADA4941-1 AD7683 AD76871 AD76881 AD7903 ADA4841-x AD7684 AD7694 AD76931 AD7902 14 AD7940 AD79421 AD79461 1 Pin-for-pin compatible. FUNCTIONAL BLOCK DIAGRAM Figure 1. GND VDD1 VDD2 2.5V REF1 REF2 REF = 2.5V TO 5V ADC1 IN1+ IN1– VIO1 SDI1 SCK1 CNV1 SDO1 VIO1/VIO2 SDI1/SDI2 SCK1/SCK2 CNV1/CNV2 SDO1 REF ±10V, ±5V, ... ADC2 IN2+ IN2– VIO2 SDI2 SCK2 CNV2 SDO2 SDO2 REF ±10V, ±5V, ... 3-WIRE OR 4-WIRE INTERFACE (SPI, CS, AND CHAIN MODES) AD7903 ADA4941-1 ADA4941-1 |
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