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AD7794BRU データシート(PDF) 1 Page - Analog Devices |
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AD7794BRU データシート(HTML) 1 Page - Analog Devices |
1 / 36 page 6-Channel, Low Noise, Low Power, 24-/16-Bit ∑-Δ ADC with On-Chip In-Amp and Reference AD7794/AD7795 Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 www.analog.com Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved. FEATURES Up to 23 effective bits RMS noise: 40 nV @ 4.17 Hz, 85 nV @ 16.7 Hz Current: 400 μA typical Power-down: 1 μA maximum Low noise, programmable gain, instrumentation amp Band gap reference with 4 ppm/°C drift typical Update rate: 4.17 Hz to 470 Hz Six differential analog inputs Internal clock oscillator Simultaneous 50 Hz/60 Hz rejection Reference detect Programmable current sources On-chip bias voltage generator Burnout currents Low-side power switch Power supply: 2.7 V to 5.25 V Temperature range: B grade: –40°C to +105°C C grade: –40°C to +125°C Independent interface power supply 24-lead TSSOP 3-wire serial interface SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK APPLICATIONS Temperature measurement Pressure measurement Weigh scales Strain gage transducers Gas analysis Industrial process control Instrumentation Blood analysis Smart transmitters Liquid/gas chromatography 6-digit DVM GENERAL DESCRIPTION The AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications. They contain a low noise, 24-/16-bit ∑-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator that is used to set the common- mode voltage of a channel to AVDD/2. The low-side power switch can be used to power down bridge sensors between conversions, minimizing the system’s power consumption. The AD7794/AD7795 can operate with either an internal clock or an external clock. The output data rate from each part can vary from 4.17 Hz to 470 Hz. Both parts operate with a power supply from 2.7 V to 5.25 V. The B-grade parts (AD7794 and AD7795) are specified for a temperature range of −40°C to +105°C while the C-grade part (AD7794) is specified for a temperature range of −40°C to +125°C. They consume a current of 400 μA typical and are housed in a 24-lead TSSOP. FUNCTIONAL BLOCK DIAGRAM DOUT/RDY DIN SCLK CS DVDD SERIAL INTERFACE AND LOGIC CONTROL Σ-Δ ADC AD7794: 24-BIT ADC AD7795: 16-BIT ADC AD7794/AD7795 AIN1(+) AIN1(–) AIN2(+) AIN2(–) AIN3(+) AIN3(–) AIN5(+)/IOUT2 AIN5(–)/IOUT1 AIN6(+)/P1 AIN6(–)/P2 VDD GND MUX VBIAS PSW GND BAND GAP REFERENCE TEMP SENSOR CLK INTERNAL CLOCK GND REFERENCE DETECT GND AVDD AIN4(+)/REFIN2(+) REFIN1(+) AIN4(–)/REFIN2(–) REFIN1(–) VDD IN-AMP BUF Figure 1. |
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