Overview
The MX7705EWE+T is a low-power, 2-channel, serial-output analog-to-digital converter (ADC) produced by Analog Devices Inc./Maxim Integrated. This device features a sigma-delta modulator with a digital filter, achieving 16-bit resolution with no missing codes. It is pin compatible and software compatible with the AD7705. The MX7705EWE+T includes an on-chip input buffer and a programmable-gain amplifier (PGA), and it operates from a single supply voltage ranging from 2.7V to 5.25V. The device is known for its low power consumption, with a typical operating supply current of 320µA at 3V and a power-down current of 2µA.
Key Specifications
| Parameter | Value |
|---|---|
| Package/Case | SOIC-Wide-16 |
| Number of Channels | 2 Channel |
| Resolution | 16 bit |
| Interface Type | 3-Wire, SPI |
| Sampling Rate | 500 S/s |
| Input Type | Differential |
| Architecture | Sigma-Delta |
| Minimum Operating Temperature | -40°C |
| Maximum Operating Temperature | +85°C |
| Gain Error | 0.003% FSR |
| INL - Integral Nonlinearity | 0.003% FSR |
| Operating Supply Voltage | 3V, 5V |
| Power Dissipation | 1mW (max), 3V Supply |
| Power-Down Current | 2µA (typ) |
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
Applications
- Flow and Gas Meters
- Industrial Instruments
- Loop-Powered Systems
- Medical Instrumentation
- Pressure Transducers
- RTD Measurements
- Strain-Gauge Measurements
- Thermocouple Measurements
- Weigh Scales
Q & A
- What is the resolution of the MX7705EWE+T ADC?
The MX7705EWE+T has a 16-bit resolution with no missing codes. - How many input channels does the MX7705EWE+T have?
The device has two fully differential input channels. - What is the operating supply voltage range for the MX7705EWE+T?
The device operates from a single supply voltage ranging from 2.7V to 5.25V. - What is the typical operating supply current of the MX7705EWE+T at 3V?
The typical operating supply current is 320µA at 3V. - What is the power-down current of the MX7705EWE+T?
The power-down current is 2µA (typ). - Is the MX7705EWE+T compatible with other ADC models?
Yes, it is pin compatible and software compatible with the AD7705. - What type of serial interface does the MX7705EWE+T support?
The device supports an SPI-/QSPI-/MICROWIRE-compatible 3-wire serial interface. - What are the key applications of the MX7705EWE+T?
The device is used in applications such as flow and gas meters, industrial instruments, medical instrumentation, pressure transducers, and more. - Does the MX7705EWE+T have internal analog input buffers?
Yes, the device features internal analog input buffers. - What is the gain range of the programmable-gain amplifier (PGA) in the MX7705EWE+T?
The PGA has a gain range from 1 to 128.
