MAX78700 Multichannel, Isolated, Precision ADC General Description Benefits and Features The MAX78700 is an isolated analog-to-digital converter Better Than 0.5% Watt-Hour Accuracy Over Wide (ADC) for use with a compatible MAX78xxx energy mea- Dynamic Range Using a Single Calibration Point surement processor. The device provides current and High-Resolut ion Delta-Sigm a ADC voltage measurements to the host while the host pro- Factory-Trimmed Voltage Reference and Die vides control, command, and power to the MAX78700. A Temperature Sensor pulse transformer provides the isolated data and power Simplified System Architecture path between the device and host, eliminating the need No Power Supply Required for additional isolation components in the measurement Fully Powered by the Host with the Isolation subsystem. Transformer Eliminate s Data Isolation Components Applications Reduced Form Factor and Bill of Materials Smart Grid-Friendly Equipm ent Small 10-Pin MAX Package Ligh ting Control Systems Commercial and Industrial Automation Ordering Information appears at end of data sheet. Rene wable Energy System s Electric Vehicle Charging S ystems For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX78700.related. Block Diagram POWER, TIMING, SYSTEM POWER CONTROL INAP ISOP ENERGY INAN RESISTIVE MEASUREMENT MUX SENSORS ADC PROCESSOR INBP HOST HOST INTERFACE ISON INBN MAX78700 ADC DATA MAX is a registered trademark of Maxim Integrated Products, Inc. 19-6565 Rev 0 12/12MAX78700 Multichannel, Isolated, Precision ADC Absolute Maximum Ratings (All voltages with respect to GND.) Operating Junction Temperature (Peak, 100ms) ............ +140C Voltage Range INAN, INAP, INBP, INBN ............. -0.5V to +4.6V Operating Junction Temperature (Continuous) ............... +125C Voltage Range ISOP, ISON .................................. -0.5V to +4.6V Storage Tempera ture ........................................ -45C to +165C Operating Temperature Range ........................... -40C to +85C Lead Temperatur e (soldering, 10s) ................................. +300C Operating Junction Temperature (Peak) ......................... +140C Soldering Temperature (reflow) ....................................... +260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended External Components NAME FROM TO FUNCTION VALUE UNIT C1 V GND Bypass capacitor for supply 0.5 F CC Performance Specifications (Limits are 100% production tested at T = +22C. Limits over the operating temperature range and relevant supply voltage range are A guaranteed by design and characterization.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V - V + mV CC CC Usable Input Range V INAP, INAN, INBP, INBN IN 250 250 peak First 10 harmonics, f = 65Hz, IN Total Harmonic Distortion THD V = 20mV, 64kpts FFT, -85 dB IN Blackman-Harris window Input Impedance f = 65Hz 20 90 k IN Temperature Coefficient of Input f = 65Hz (Note 1) 1.7 /C IN Impedance 6 10 Nout 357nV / V PK IN ADC Gain Error vs. 100 V CC / 3. 3 50 ppm/% % Power-Supply Variation V = 200mV , 65Hz, IN P-P V = 3.0V, 3.6V CC Input Offset -10 +10 mV Note 1: Guaranteed by design, not subject to test. Maxim Integrated 2 www.maximintegrated.com