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
Product Categories
Product Lifecycle
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.
Documentation & Resources
Product Recommendations
MX7705 Companion Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MX7705EPE+ | Material Declaration | Reliability Data | Plastic Dual-In-Line, Narrow (0.3in) | |
| MX7705EUE+ | Material Declaration | Reliability Data | 16-TSSOP_4.4-4.4_MM | |
| MX7705EUE+T | Material Declaration | Reliability Data | 16-TSSOP_4.4-4.4_MM | |
| MX7705EWE+ | Material Declaration | Reliability Data | Small-Outline IC, Wide (0.3in) | |
| MX7705EWE+T | Material Declaration | Reliability Data | Small-Outline IC, Wide (0.3in) | |
| Wafer Fabrication Data |
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