AD7401A: Isolated Sigma-Delta Modulator
The AD7401A1 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 ...続きを見る
AD7401A: Isolated Sigma-Delta Modulator
製品概要
The AD7401A1 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 monolithic air core transformer 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.
1Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
Applications
- AC motor controls
- Shunt current monitoring
- Data acquisition systems
- Analog-to-digital and opto-isolator replacements
Features
- 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
Diagrams
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- その他
- シンボル＆フットプリント
Functional Block Diagram
Isolated Sigma-Delta Modulator
Functional Block Diagram for AD7401A