Analog Devices Inc. ADuM7801 Isolated Analog-to-Digital Converters
Analog Devices ADuM7801 Isolated Analog-to-Digital Converters are high-performance isolated ADCs with a second-order Σ-Δ modulator that converts analog input signals into a high-speed, single-bit data stream. These devices operate from a 4.0V to 5.5V high-side supply, accept a pseudodifferential input of ±250mV for specified performance, and are well suited for shunt-resistor current monitoring in high voltage systems that require galvanic isolation.
The analog input is continuously sampled by a high-performance analog-to-digital modulator and converted to a pulse-density-modulated output stream at a data rate of up to 26MHz. With an appropriate sinc3 digital filter, the Analog Devices ADuM7801 ADCs achieve 88dB SNR at 97.6kSPS with a 256 decimation rate and a 25MHz input clock. At the same time, the digitally isolated serial interface operates from a 3V to 5.5V controller-side supply. High-speed CMOS and monolithic transformer technology provide on-chip isolation with performance advantages over alternatives such as optocoupler devices.
The ADI ADuM7801 ADCs are ideal for shunt current monitoring, AC motor controls, power and solar inverters, wind turbine inverters, and analog-to-digital and opto-isolator replacement applications. The ADuM7801 devices are offered in an 8-lead SOIC package and support an operating temperature range from -40°C to +125°C.
Features
- 5MHz to 25MHz main clock input frequency
- 16-bit resolution with no missing codes
- ±320mV full-scale analog input range
- 88dB typical SNR
- 200kV/μs minimum common-mode transient immunity
- ±0.30μV/°C maximum offset drift vs. temperature
- ±28ppm/°C maximum gain error drift vs. temperature
- Integrated digital isolator in 8-lead SOIC package
- Operating temperature range from -40°C to +125°C
Applications
- Shunt current monitoring
- AC motor controls
- Power and solar inverters
- Wind turbine inverters
- Analog-to-digital and opto-isolator replacement
Specifications
- High-side supply voltage from 4.0V to 5.5V
- Controller-side supply voltage from 3.0V to 5.5V
- Pseudodifferential input signal of ±250mV for specified performance
- Full-scale analog input voltage range from -320mV to +320mV
- Data rate up to 26MHz
- 97.6kSPS output with 256 decimation rate and 25MHz input clock using sinc3 filter
- 8-lead SOIC package option
- 5700Vrms isolation voltage for 1 minute, pending UL 1577
- 2121V peak VIORM, pending IEC 60747-17 approval
Dev Tools
Analog Devices Inc. EV-ADuM7801-8FMCZ Evaluation Board
A fully featured platform for evaluating the ADuM7801 ADC with a Σ-Δ modulated bitstream output.
Digilent ZedBoard Zynq-7000 Development Board
A low-cost development board for the Xilinx Zynq-7000 all-programmable SoC (AP SoC).
Analog Devices Inc. EVAL-ADuM7811 Evaluation Board
A fully featured platform for evaluating the ADuM7811 ADC with sigma-delta-modulated bitstream.
Software
Block Diagram
