DATASHEET ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329 FN8273 12-Bit, 250kSPS Low-Power ADCs with Single-Ended and Differential Inputs and Multiple Input Rev 1.00 Channels September 5, 2013 The ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, Features ISL26325 and ISL26329 family of sampling SAR-type ADCs Pin-compatible family allows easy design upgrades feature excellent linearity over supply and temperature variations, and offer versions with 1-, 2-, 4- and 8-channel Excellent differential non-linearity (0.7LSB max) single-ended inputs, and 1-, 2- and 4-channel differential Low THD: -86dB (typ) inputs. A proprietary input multiplexer and combination buffer Simple SPI-compatible serial digital interface amplifier reduces the input drive requirements, resulting in lower cost and reduced board space. Specified measurement Low 3mA operating current accuracy is maintained with input signals up to V . DD Power-down current between conversions 8A (typ) Members of the The ISL26320, ISL26321, ISL26322, +5.25V to +2.7V supply ISL26323, ISL26324, ISL26325 and ISL26329 family of Excellent ESD survivability: 5kV HBM, 350V MM, 2kV CDM Low-Power ADCs offer pinout intercompatibility, differing only in the analog inputs, to support quick replication of proven Applications layouts across multiple design platforms. Industrial process control The serial digital interface is SPI compatible and is easily interfaced to popular FPGAs and microcontrollers. Power Energy measurement consumption is limited to 15mW at a sampling rate of Multichannel data acquisition systems 250kSPS, and an operating current of just 8A typical Pressure sensors between conversions, when configured for Auto Power-down mode. Flow controllers The ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325 and ISL26329 feature up to 5kV Human Body Model ESD survivability and are available in the popular SOIC and TSSOP packages. Performance is specified for operation over the full industrial temperature range (-40C to +125C). VDD VREF BUFFER CNV ANALOG INPUTS SCLK DIFFERENTIAL/ MUX ADC SPI SINGLE-ENDED SDO SDI OSC POR GND FIGURE 1. FUNCTIONAL BLOCK DIAGRAM FN8273 Rev 1.00 Page 1 of 23 September 5, 2013ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329 Application Block Diagram 2 I C Bus RTC RS-232 ANALOG SIGNAL INPUT MODULEs MUX and ADC Pressure/Strain Gage Sensor VREF RS-485 RS-485 Master Precision Amps C C M ADC RTC Gain Active U Amplifiers Filters DCP X +V +V VREF Precision Precision Amps Amps POWER -V -V Voltage Supervisor & V Temperature Sensor Sequencers LDOs VREF DCP System Core & Power I/O Power Thermistor +V Switching +V Active Regulator Switching Precision LDO Filters Precision V Switching Amps Regulators Amps Controller -V -V Thermocouple +V Buffer, Filters, Span Drivers Actuators +V Active Precision +V +V Filters Motors +V High Voltage Input Rail ~24V Amps M Precision Control loops Precision Precision -V Amps U DAC Amps Amps X -V ISO-Thermal -V -V Block VREF Single Ended -V Controller ANALOG SIGNAL OUTPUT MODULE Flow Sensor Loop Supply Gain Active Amplifiers Filters Isolator +V +V Differential Pressure Iout Vin Transducer Precision Precision 4 -20mA w/ Amps Amps Isolated Power Extractor -V -V Pin-Compatible Family RESOLUTION SPEED ANALOG INPUT MODEL (Bits) (kHz) INPUT CHANNELS ISL26310 12 125 Differential 1 ISL26311 12 125 Single-Ended 1 ISL26312 12 125 Differential 2 ISL26313 12 125 Single-Ended 2 ISL26314 12 125 Differential 4 ISL26315 12 125 Single-Ended 4 ISL26319 12 125 Single-Ended 8 ISL26320 12 250 Differential 1 ISL26321 12 250 Single-Ended 1 ISL26322 12 250 Differential 2 ISL26323 12 250 Single-Ended 2 ISL26324 12 250 Differential 4 ISL26325 12 250 Single-Ended 4 ISL26329 12 250 Single-Ended 8 FN8273 Rev 1.00 Page 2 of 23 September 5, 2013