DATASHEET ISL267450 FN8341 Rev 0.00 12-Bit, 1MSPS SAR ADCs August 10, 2012 The ISL267450 is a 12-bit, 1MSPS sampling SAR-type ADC Features with a differential input span of 2*V volts. The ISL267450 REF Drop-in Compatible with AD7450 features excellent linearity over supply and temperature variations and is drop-in compatible with the AD7450. The Differential Input device can operate from a supply voltage of either 5V or 3V Simple SPI-compatible Serial Digital Interface and maintain measurement accuracy with input signals up to Guaranteed No Missing Codes the supply rails. 1MHz Sampling Rate The serial digital interface is SPI compatible and is easily interfaced to popular FPGAs and microcontrollers. Power 3V or 5V Operation dissipation is 9.0mW at a sampling rate of 1MSPS, and just Low Operating Current 5W between conversions utilizing Auto Power-Down mode - 1.25mA at 833kSPS with 3V Supplies (with a 3V supply). - 1.7mA at 1MSPS with 5V Supplies The ISL267450 is available in 8 Ld SOIC or MSOP packages, and are specified for operation over the Industrial temperature Power-down Current between Conversions: 1A range (40C to +85C). Excellent Differential Non-Linearity Low THD: -83dB (typ) Pb-Free (RoHS Compliant) Available in SOIC and MSOP Packages Applications Remote Data Acquisition Battery Operated Systems Industrial Process Control Energy Measurement Data Acquisition Systems Pressure Sensors Flow Controllers Block Diagram +V V DD REF SCLK V IN+ SERIAL ADC SDATA INTERFACE V IN- CS GND FN8341 Rev 0.00 Page 1 of 19 August 10, 2012ISL267450 Typical Connection Diagram 0.1F +3V/5V V REF SUPPLY + 0.1F 10F V V REF DD V V SCLK REF(P-P) IN+ V V SDATA P/C REF(P-P) IN GND CS SERIAL INTERFACE Pin Configuration ISL267450 (8 LD SOIC, MSOP) TOP VIEW V V REF 1 8 DD V SCLK IN+ 2 7 V SDATA IN- 3 6 GND CS 4 5 Pin Description ISL267450 PIN NAME PIN NUMBER DESCRIPTION V 8 Supply voltage, +2.7V to 5.25V. DD SCLK 7 Serial clock input. Controls digital I/O timing and clocks the conversion. SDATA 6 Digital conversion output. CS 5 Chip select input. Controls the start of a conversion when going low. GND 4 Ground V 3 Negative analog input. IN V 2 Positive analog input. IN+ V 1 Reference voltage. REF FN8341 Rev 0.00 Page 2 of 19 August 10, 2012