ADUM7704-8BRIZ

ADCs/DACs - Special Purpose Overview

The ADuM7704-8BRIZ is a 16-bit isolated Sigma-Delta modulator from Analog Devices, packaged in an 8-lead wide-body SOIC_IC. It utilizes iCoupler technology to provide galvanic isolation between the analog input and digital output. The device operates with an analog supply (VDD1) of 4.5 V to 20 V and a digital supply (VDD2) of 3 V to 5.5 V. It accepts a pseudo-differential analog input range of ±50 mV for specified performance, extending to ±64 mV full scale. Key electrical parameters include a typical Signal-to-Noise Ratio (SNR) of 82 dB, an Effective Number of Bits (ENOB) of 13 bits, and a maximum main clock frequency of 21 MHz. The component supports a data rate of 78.1 kSPS at 20 MHz clock with 256 decimation.

ADCs/DACs - Special Purpose Feature Summary

• Integrated on-chip digital isolator based on iCoupler technology with 150 kV/µs minimum common-mode transient immunity.
• 16-bit resolution with guaranteed no missing codes and ±2 LSB integral nonlinearity.
• Wide analog supply range (4.5 V to 20 V) suitable for high-voltage shunt monitoring applications.
• Safety approvals including UL 1577 (5700 Vrms), IEC/EN/CSA 62368-1, and DIN EN IEC 60747-17 (VIORM = 1401 VPEAK).

ADCs/DACs - Special Purpose Applications

• Shunt current monitoring in high-voltage systems
• AC motor controls requiring galvanic isolation
• Power and solar inverters
• Wind turbine inverters

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific package variant when ordering, as the ADuM7704 family includes both 16-lead SOIC_W and 8-lead SOIC_IC options. The -8BRIZ suffix denotes the 8-lead wide-body SOIC_IC package with an operating temperature range of −40°C to +105°C. Confirm insulation clearance and creepage distances required by the target application's safety standards against the package characteristics listed in the datasheet.

ADCs/DACs - Special Purpose Selection Notes

Select the ADuM7704-8BRIZ when an 8-lead footprint is preferred over the 16-lead version. Note that the 8-lead package has a higher offset drift vs. temperature (±0.6 µV/°C max) compared to the 16-lead variant (±0.25 µV/°C max). Ensure the design accommodates the specific creepage and clearance requirements of the SOIC_IC package if strict isolation distances are mandated by regulatory bodies.

ADCs/DACs - Special Purpose Part Context

The ADuM7704 belongs to the ADuM770x family of isolated Sigma-Delta modulators. It serves as a direct replacement for traditional optocoupler-based solutions, offering superior performance characteristics through monolithic transformer technology. The device converts analog signals into a high-speed single-bit data stream, which requires external digital filtering (e.g., sinc3 filter) to reconstruct the N-bit word.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: ADUM7704-1RWZ (16-lead SOIC_W variant).