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AD7707 Datasheet(PDF) 1 Page - Analog Devices |
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AD7707 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 53 page  3 V/5 V, ±10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC AD7707 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2000–2010 Analog Devices, Inc. All rights reserved. FEATURES Charge balancing ADC 16 bits, no missing codes ±0.003% nonlinearity High level (±10 V) and low level (±10 mV) input channels True bipolar ±100 mV capability on low level input Channels without requiring charge pumps Programmable gain front end Gains from 1 to 128 3-wire serial interface SPI, QSPI™, MICROWIRE™ and DSP compatible Schmitt trigger input on SCLK Ability to buffer the analog input 2.7 V to 3.3 V or 4.75 V to 5.25 V operation Power dissipation 1 mW at 3 V Standby current 8 μA maximum 20-lead SOIC and TSSOP packages GENERAL DESCRIPTION The AD7707 is a complete analog front end for low frequency measurement applications. This 3-channel device can accept either low level input signals directly from a transducer or high level (±10 V) signals and produce a serial digital output. It employs a Σ-Δ conversion technique to realize up to 16 bits of no missing codes performance. The selected input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be pro- grammed via an on-chip control register allowing adjustment of the filter cutoff and output update rate. The AD7707 operates from a single 2.7 V to 3.3 V or 4.75 V to 5.25 V supply. The AD7707 features two low level pseudo differen- tial analog input channels, one high level input channel and a differential reference input. Input signal ranges of 0 mV to 20 mV through 0 V to 2.5 V can be accommodated on both low level input channels when operating with a VDD of 5 V and a reference of 2.5 V. They can also handle bipolar input signal ranges of ±20 mV through ±2.5 V, which are referenced to the LCOM input. The AD7707, with a 3 V supply and a 1.225 V reference, can handle unipolar input signal ranges of 0 mV to 10 mV through 0 V to 1.225 V. Its bipolar input signal ranges are ±10 mV through ±1.225 V. The high level input channel can accept input signal ranges of ±10 V, ±5 V, 0 V to 10 V and 0 V to 5 V. The AD7707 thus performs all signal conditioning and conversion for a 3-channel system. The AD7707 is ideal for use in smart, microcontroller or DSP- based systems. It features a serial interface that can be configured FUNCTIONAL BLOCK DIAGRAM DVDD AVDD REF IN(–) REF IN(+) AD7707 MUX PGA CHARGE BALANCING A/D CONVERTER Σ-Δ MODULATOR DIGITAL FILTER A = 1 ≈ 128 SERIAL INTERFACE REGISTER BANK CLOCK GENERATION MCLK IN MCLK OUT AGND DGND DRDY RESET DIN DOUT CS SCLK AIN1 AIN2 LOCOM AIN3 VBIAS HICOM 5kΩ 5kΩ 15kΩ 30kΩ 30kΩ BUF Figure 1. for 3-wire operation. Gain settings, signal polarity and update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibra- tion options to eliminate gain and offset errors on the part itself or in the system. CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 20 μW typical. This part is available in a 20-lead wide body (0.3 inch) small outline (SOIC) package and a low profile 20-lead TSSOP. PRODUCT HIGHLIGHTS 1. The AD7707 consumes less than 1 mW at 3 V supplies and 1 MHz master clock, making it ideal for use in low power systems. Standby current is less than 8 μA. 2. On-chip thin-film resistors allow ±10 V, ±5 V, 0 V to 10 V, and 0 V to 5 V high level input signals to be directly accom- modated on the analog inputs without requiring split supplies or charge-pumps. 3. The low level input channels allow the AD7707 to accept input signals directly from a strain gage or transducer removing a considerable amount of signal conditioning. 4. The part features excellent static performance specifications with 16 bits, no missing codes, ±0.003% accuracy, and low rms noise. Endpoint errors and the effects of temperature drift are eliminated by on-chip calibration options, which remove zero-scale and full-scale errors. |
Similar Part No. - AD7707_17 |
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Similar Description - AD7707_17 |
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