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AD7400AYRWZ Analog Devices Isolated Sigma-Delta Modulator IC Chip 16-bit 10MHz SOIC-16-300mil
AD7400AYRWZ Product Overview
When selecting a device for motor drive current sensing or industrial isolated measurement, designers typically focus on three things: whether the isolation withstand voltage meets safety requirements, whether precision can resolve the weak signal across a shunt resistor, and whether it can directly replace a discrete optocoupler + ADC solution. The Analog Devices AD7400AYRWZ isolated Σ-Δ modulator was built for exactly that requirement.
The device uses ADI's proprietary iCoupler® digital isolation technology, integrating a second-order Σ-Δ modulator and on-chip digital isolator in a single package. The analog input is continuously sampled at 10 MSPS, eliminating the need for external sample-and-hold circuitry. The output is a high-speed 1-bit data stream at a 10 MHz data rate. Input information is encoded as a density of ones in the output stream and can be reconstructed with an appropriate digital filter (a Sinc³ filter is recommended, implementable in an FPGA or DSP).
The AD7400AYRWZ operates from a 5V single supply (VDD1), with the serial I/O side supporting 5V or 3V supply (VDD2). It accepts a differential input of ±250 mV (±320 mV full scale). The part contains an on-chip reference and is rated for -40℃ to +125℃. Compared with conventional optocoupler solutions, iCoupler technology provides superior operating characteristics and higher integration.
AD7400AYRWZ Key Specifications
| Item | Specification |
|---|---|
| Brand | Analog Devices |
| Model | AD7400AYRWZ |
| Device Type | Isolated Σ-Δ Modulator |
| Resolution | 16 bits, no missing codes |
| Clock Rate | 10 MHz |
| Modulator Order | Second-order |
| Analog Input Range | ±250 mV (±320 mV full scale) |
| INL (Typical) | ±2 LSB at 16 bits |
| Offset Drift (Typical) | 1.5 μV/℃ |
| Supply Voltage (VDD1) | 4.5V ~ 5.5V |
| Supply Voltage (VDD2) | 3V ~ 5.5V |
| Power Consumption (Typical) | 15.5 mA at 5.5V |
| Digital Isolation | iCoupler® |
| Isolation Rating | 5000 V rms (1 minute, UL 1577) |
| Package | SOIC-16-300mil (16-Lead SOIC Wide) |
| Operating Temp | -40℃ ~ +125℃ |
| MSL | Level 3 |
AD7400AYRWZ Applications
AC motor control and servo drive current sensing
Shunt current monitoring
Data acquisition systems
A/D + opto-isolator replacements
Industrial isolated voltage/current monitoring
FAQ
Q: What is the AD7400AYRWZ?
A: It is an isolated Σ-Δ modulator from ADI based on iCoupler® digital isolation technology, converting analog input signals into a high-speed 1-bit data stream with up to 5000 V rms electrical isolation in an SOIC-16 wide-body package.
Q: What are the core specifications and modulator architecture?
A: It features a second-order Σ-Δ modulator architecture with 16-bit no missing codes resolution, an internal 10 MHz clock rate, and an analog input range of ±250 mV (±320 mV full scale).
Q: What supply voltages are supported?
A: It uses dual supplies: VDD1 (input side) at 4.5V to 5.25V and VDD2 (output side) at 3V to 5.5V, allowing direct interface with 3.3V or 5V logic.
Q: What are the operating temperature range and accuracy?
A: The operating temperature range is -40°C to +125°C. INL is ±2 LSB typical at 16 bits, and offset drift is 1.5 µV/°C typical, providing excellent temperature stability.
Q: What package and dimensions does it use?
A: It uses an SOIC-16-300mil (wide body) package measuring 10.5 mm x 7.6 mm x 2.35 mm, with a moisture sensitivity level of MSL 3 (168 hours).
Q: What are the isolation performance and safety certifications?
A: It provides 5000 V rms isolation voltage for 1 minute and complies with UL 1577, IEC/CSA 62368-1, IEC/CSA 61010-1, and DIN EN IEC 60747-17 (VDE 0884-17) safety standards.
Q: What functional blocks are integrated inside the chip?
A: It integrates a second-order Σ-Δ modulator, an iCoupler digital isolator, an on-chip reference, and an internal 10 MHz clock, eliminating the need for external sample-and-hold circuitry.
Q: What are the main application scenarios?
A: It is widely used in AC motor control, shunt current monitoring, data acquisition systems, and as a replacement for analog-to-digital converters and opto-isolators.
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- Part number:
- AD7400AYRWZ
- Device Type:
- Isolated Σ-Δ Modulator
- Resolution:
- 16 bits, no missing codes
- Clock Rate:
- 10 MHz
- Analog Input Range:
- ±250 mV
- Offset Drift (Typical):
- 1.5 μV/°C
- Supply Voltage VDD1:
- 4.5V ~ 5.5V
- Supply Voltage VDD2:
- 3V ~ 5.5V
- Package:
- SOIC-16-300mil
- Operating Temp:
- -40°C ~ +125°C
