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AD7798BRUZ-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7798BRUZ-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 28 page 3-Channel, Low Noise, Low Power, 16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp Data Sheet AD7798/AD7799 Rev. B 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 ©2005–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES RMS noise: 27 nV at 4.17 Hz (AD7799) 65 nV at 16.7 Hz (AD7799) 40 nV at 4.17 Hz (AD7798) 85 nV at 16.7 Hz (AD7798) Current: 380 µA typical Power-down: 1 µA maximum Low noise, programmable gain, instrumentation amp Update rate: 4.17 Hz to 470 Hz 3 differential inputs Internal clock oscillator Simultaneous 50 Hz/60 Hz rejection Reference detect Low-side power switch Programmable digital outputs Burnout currents Power supply: 2.7 V to 5.25 V –40°C to +105°C temperature range Independent interface power supply 16-lead TSSOP package INTERFACE 3-wire serial SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK APPLICATIONS Weigh scales Pressure measurement Strain gauge transducers Gas analysis Industrial process control Instrumentation Portable instrumentation Blood analysis Smart transmitters Liquid/gas chromotography 6-digit DVM FUNCTIONAL BLOCK DIAGRAM DOUT/RDY DIN SCLK CS DVDD SERIAL INTERFACE AND CONTROL LOGIC Σ-Δ ADC AD7798/AD7799 AD7798: 16-BIT AD7799: 24-BIT AIN2(+) AIN2(–) AIN3(+)/P1 AIN1(+) AIN1(–) AIN3(–)/P2 AVDD GND MUX INTERNAL CLOCK GND GND AVDD REFIN(–) PSW IN-AMP REFERENCE DETECT REFIN(+) Figure 1. GENERAL DESCRIPTION The AD7798/AD7799 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7798/AD7799 contains a low noise, 16-/24-bit ∑-∆ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz. On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz. The part operates with a power supply from 2.7 V to 5.25 V. The AD7798 consumes a current of 300 µA typical, whereas the AD7799 consumes 380 µA typical. Both devices are housed in a 16-lead TSSOP package. |
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