AD7401A Isolated Sigma-Delta Modulator
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 Analog Devices, Inc., iCoupler® technology. The AD7401A operates from a 5 V power supply and accepts a 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 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 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 part 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.
Applications
- AC motor controls
- Shunt current monitoring
- Data acquisition systems
- Analog-to-digital and opto-isolator replacements
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
- Please see data sheet for additional features
| Automotive- Powertrain Body and Chassis
IBIS ModelsReference Designs |
Data Sheets
Application Notes
Frequently Asked Questions
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| AD7401AYRWZ Production | 16 ld SOIC - Wide | OTH 47 | -40 to 125C | 3.72 | 3.15 | Y |
| AD7401AYRWZ-RL Production | 16 ld SOIC - Wide | REEL 1000 | -40 to 125C | 0 | 3.15 | Y |
| ADW70015Z-0RL Production | 16 ld SOIC - Wide | REEL 1000 | | 0 | 3.8 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVAL-AD7401AEDZ | Evaluation Board | 59 | Y |
| EVAL-CED1Z | Evaluation Board | 249 | Y |
Reference Materials
