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MX7705：16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC

The MX7705 low-power, 2-channel, serial-output analog-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 features 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 performance (±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 differential 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 output 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 signals to be directly acquired with little or no signal-conditioning requirements. The MX7705 is available in a 16-pin TSSOP package.

Key Features Pin Compatible and Software Compatible with the AD7705 16-Bit Sigma-Delta ADC Two Fully Differential Input Channels 0.003% Integral Nonlinearity with No Missing Codes Interface with Schmitt Triggers on Inputs Internal Analog Input Buffers PGA from 1 to 128 Single (2.7V to 3.6V) or (4.75V to 5.25V) Supply Low Power 1mW (max), 3V Supply 2µA (typ) Power-Down Current SPI-/QSPI-/MICROWIRE-Compatible 3-Wire Serial Interface

MX7705: Functional Diagram Applications/Uses Flow and Gas Meters Industrial Instruments Loop-Powered Systems Medical Instrumentation Pressure Transducers RTD Measurements Strain-Gauge Measurements Thermocouple Measurements Weigh Scales

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