Analog Devices Inc. ADuM7702 16-bit Sigma-Delta Modulators

Analog Devices Inc. ADuM7702 16-bit Sigma-Delta Modulators utilize iCoupler^® technology to convert analog input signals to high-speed single-bit data streams with on-chip digital isolation. These modulators accept a pseudo-differential input signal of ±50mV (±64mV full-scale) and operate from a 4.5V to 5.5V power supply range (V_DD1). This pseudo-differential input is ideally suited to shunt voltage monitoring in high-voltage applications where galvanic isolation is required. The analog input of the ADuM7702 modulators is continuously sampled by a high-performance analog modulator. This input signal is then converted into a digital density output stream with a data rate of up to 21MHz.

The Analog Devices Inc. ADuM7702 Modulators can reconstruct the original information with an appropriate sinc3 digital filter to achieve an 82dB Signal-to-Noise Ratio (SNR). These modulators are available in both 16-lead SOIC_W and 8-lead SOIC_IC packages and operate within -40°C to 125°C temperature range. Typical applications include shunt current monitoring, AC motor controls, power, and solar inverters, and wind turbine inverters.

Features

5MHz to 21MHz master clock input frequency
±0.25µV/°C offset drift vs. temperature
82dB typical SNR
16-bits, no missing codes
±64mV full-scale analog input voltage range
13-bits typical ENOB
10mA maximum I_DD1
On-board digital isolator
-40°C to 125°C operating temperature range

High isolation common-mode transient immunity:
- 150kV/µs minimum, V_DD2 = 3.3V
Wide-body SOICs:
- 16-lead SOIC_W
- 8-lead SOIC_IC with increased creepage
Safety and regulatory approvals:
- UL recognition
- 5700V_rms for 1 minute per UL 1577
- CSA component acceptance notice 5A
- VDE certificate of conformity