Analog DevicesAD7401AYRWZADC

The AD7401A is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on the Analog Devices, Inc., iCoupler® technology.

The AD7401A operates from a 5 V power supply and accepts a pseudo-differential input signal of ±250 mV (±320 mV full scale). The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate of up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3.3 V supply (VDD2).

The serial interface is digitally isolated. High speed CMOS, combined with Analog Devices, Inc., iCoupler® technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The device contains an on-chip reference. The AD7401A is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +125°C.

Key Features and Benefits

• •  20 MHz maximum external clock rate
• •  Second-order modulator
• •  16 bits, no missing codes
• •  ±2 LSB INL typical at 16 bits
• •  1 µV/°C typical offset drift
• •  On-board digital isolator
• •  On-board reference
• •  ±250 mV analog input range

Applications

• •  AC motor controls
• •  Shunt current monitoring
• •  Data acquisition systems
• •  Analog-to-digital and opto-isolator replacements

Evaluation Board

The AD7401A can be evaluated with the EVAL-AD7401A

Block Diagrams and Tables

Featured Products

AD7401AYRWZ
AD7401AYRWZ-RL
ADW70015Z-0RL
AD7401ABRWZ-RL
EVAL-AD7401AEDZ

Converting digital signals from analog is easy with Analog Devices' AD7401AYRWZ ADC. This device's digital interface is serial. It has a single-ended input signal. This device is based on Delta-Sigma architecture. Its maximum power dissipation is 105 mW. This ADC has a resolution of 16bit. This ADC has an input voltage of ±0.25 V. This ADC has a temperature range of -40 °C to 125 °C.