Analog Devices Inc. ADuM7701 16-Bit, Isolated Sigma-Delta Modulators

Analog Devices ADuM7701 16-Bit, Isolated Sigma-Delta (ΣΔ) Modulators convert an analog input signal into a high-speed, single-bit data stream with on-chip digital isolation based on iCoupler technology. The ADuM7701 modulators operate from a 5V (V_DD1) power supply and accept a pseudo-differential input signal of ±250mV (±320mV full scale). The pseudo-differential input is ideally suited to shunt voltage monitoring in high-voltage applications requiring galvanic isolation.

The ADuM7701 continuously samples the analog input, converting to a ones density digital output stream with a data rate of up to 21MHz. The serial input/output operates from a 5V or a 3.3V supply (V_DD2). The device receives the original information reconstructed with an appropriate digital filter to achieve an 86dB signal to noise ratio (SNR) at 78.lkSPS with a 20MHz MCLK.

The device features a serial interface that is digitally isolated. Combining CMOS and monolithic transformer technology results in outstanding performance characteristics, superior to alternatives using on-chip isolation. The ADuM7701 is available in both 16-lead and 8-lead wide-body SOIC packages and operate in a temperature range of -40°C to +125°C.

Features

5MHz to 21MHz external clock input rate
1μV/°C Max offset drift vs. temperature
86dB Typical Signal-to-noise ratio (SNR)
16 bits, no missing codes
±320mV Full-scale analog input range
14-bits Typical Effective number of bits (ENOB): 14 bits typical
Current consumption 10mA max
On-board digital isolator
-40°C to +125°C Operating range
>150kV/μs Typical High common-mode transient immunity

Wide-body SOIC with increased creepage package
- 16-pin and 8-pin package options
Safety and regulatory approvals (pending)
- UL recognition
  - 5700V_rms for 1 minute per UL 1577
CSA Component Acceptance Notice SA
VOE Certificate of Conformity
- DIN V VDE V 0884-10
- V_lORM = 1270 VPEAK
- DIN V VDE V 0884-11
- V_lORM = 1060 V_PEAK