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MX7705 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MX7705 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 34 page  General Description The MX7705 low-power, 2-channel, serial-output ana- log-to-digital converter (ADC) includes a sigma-delta modulator with a digital filter to achieve 16-bit resolution with no missing codes. This ADC is pin compatible and software compatible with the AD7705. The MX7705 fea- tures an on-chip input buffer and programmable-gain amplifier (PGA). The device offers an SPI -/QSPI-/ MICROWIRE -compatible serial interface. The MX7705 operates from a single 2.7V to 5.25V supply. The operating supply current is 320µA (typ) with a 3V supply. Power-down mode reduces the supply current to 2µA (typ). Self-calibration and system calibration allow the MX7705 to correct for gain and offset errors. Excellent DC perfor- mance (±0.003% FSR INL) and low noise (650nV) make the MX7705 ideal for measuring low-frequency signals with a wide dynamic range. The device accepts fully dif- ferential bipolar/unipolar inputs. An internal input buffer allows for input signals with high source impedances. An on-chip digital filter, with a programmable cutoff and out- put data rate, processes the output of the sigma-delta modulator. The first notch frequency of the digital filter is chosen to provide 150dB rejection of common-mode 50Hz or 60Hz noise and 98dB rejection of normal-mode 50Hz or 60Hz noise. A PGA and digital filtering allow sig- nals to be directly acquired with little or no signal-condi- tioning requirements. The MX7705 is available in 16-pin PDIP, SO, and TSSOP packages. Applications Industrial Instruments Weigh Scales Strain-Gauge Measurements Loop-Powered Systems Flow and Gas Meters Medical Instrumentation Pressure Transducers Thermocouple Measurements RTD Measurements Features o Pin Compatible and Software Compatible with the AD7705 o 16-Bit Sigma-Delta ADC o Two Fully Differential Input Channels o 0.003% Integral Nonlinearity with No Missing Codes o Interface with Schmitt Triggers on Inputs o Internal Analog Input Buffers o PGA from 1 to 128 o Single (2.7V to 3.6V) or (4.75V to 5.25V) Supply o Low Power 1mW (max), 3V Supply 2µA (typ) Power-Down Current o SPI-/QSPI-/MICROWIRE-Compatible 3-Wire Serial Interface o 16-Pin PDIP, SO, and TSSOP Packages 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 SCLK GND VDD DIN DOUT DRDY AIN2- REF- REF+ TOP VIEW MX7705 PDIP/SO/TSSOP CLKIN CLKOUT AIN2+ CS RESET AIN1+ AIN1- Pin Configuration Ordering Information 19-3051; Rev 0; 10/03 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MX7705EPE* -40 °C to +85°C 16 PDIP MX7705EWE* -40 °C to +85°C 16 WIDE SO MX7705EUE -40 °C to +85°C 16 TSSOP SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. *Future product—contact factory for availability. |
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