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MX7705: 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC Data Sheet (Rev. 5)6/18/2015PDF459K
Overview
Features and Benefits
- 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
Product Details
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.
Applications
- 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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Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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