Catalog
16-Bit, Isolated, Sigma-Delta Modulator
Key Features
• 5 MHz to 21 MHz master clock input frequency
• Offset drift vs. temperature: ±0.25 μV/°C
• SNR: 82 dB typical
• 16 bits, no missing codes
• Full-scale analog input voltage range: ±64 mV
• ENOB: 13 bits typical
• IDD1: 10 mA maximum
• On-board digital isolator
• Operating temperature range: −40°C to +125°C
• High isolation common-mode transient immunity: 150 kV/μs minimum, VDD2= 3.3 V
• Wide-body SOICs16-lead SOIC_W8-lead SOIC_IC with increased creepage
• 16-lead SOIC_W
• 8-lead SOIC_IC with increased creepage
• Safety and regulatory approvalsUL recognition5700 V rms for 1 minute per UL 1577
• UL recognition5700 V rms for 1 minute per UL 1577
• 5700 V rms for 1 minute per UL 1577
• CSA Component Acceptance Notice 5A
• VDE Certificate of ConformityDIN V VDE V 0884-10: VIORM = 1270 VPEAKDIN V VDE V 0884-11: VIORM = 1060 VPEAK(pending)
• DIN V VDE V 0884-10: VIORM = 1270 VPEAK
• DIN V VDE V 0884-11: VIORM = 1060 VPEAK(pending)
Description
AI
The ADuM7702 is a high performance, second-order, Σ-Δ modulator that converts an analog input signal to a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc.,iCoupler®technology. The device operates from a 4.5 V to 5.5 V power supply range (VDD1) and accepts a pseudo differential input signal of ±50 mV (±64 mV full-scale). The pseudo differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required.The analog input is continuously sampled by a high performance analog modulator and converted to a ones density digital output stream with a data rate of up to 21 MHz. The original information can be reconstructed with an appropriate sinc3 digital filter to achieve an 82 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a 256 decimation rate and a 20 MHz master clock. The serial input and output operates from a 5 V or a 3 V supply (VDD2).The serial interface is digitally isolated. High speed complementary metal-oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, results in on-chip isolation providing outstanding performance characteristics, superior to alternatives such as optocoupler devices. The ADuM7702 is available in both a 16-lead SOIC_W and an 8-lead SOIC_IC and has an operating temperature range of −40°C to +125°C.ApplicationsShunt current monitoringAC motor controlsPower and solar invertersWind turbine invertersAnalog-to-digital and optoisolator replacement
