DATASHEET ISL267440, ISL267450A FN7708 Rev.2.00 10-Bit and 12-Bit, 1MSPS SAR ADCs June 28, 2012 The ISL267440 and ISL267450A are 10-bit and 12-bit, 1MSPS Features sampling SAR-type ADCs featuring excellent linearity over Drop-in Compatible with AD7440, AD7450A supply and temperature variations. These devices are drop-in compatible with the AD7440 and AD7450A. The robust, Differential Input fully-differential input offers high impedance to minimize Simple SPI-compatible Serial Digital Interface errors due to leakage currents, and the specified Guaranteed No Missing Codes measurement accuracy is maintained with input signals up to the supply rails. 1MHz Sampling Rate The reference accepts inputs from 0.1V to 2.2V for 3V 3V or 5V Operation operation and 0.1V to 3.5V for 5V operation. This provides Low Operating Current design flexibility in a wide variety of applications. The - 1.25mA at 1MSPS with 3V Supplies ISL267440, ISL267450A also feature up to 8kV Human Body - 1.70mA at 1MSPS with 5V Supplies Model ESD survivability. Power-down Current between Conversions: 1A The serial digital interface is SPI compatible and is easily interfaced to popular FPGAs and microcontrollers. Power Excellent Differential Non-Linearity dissipation is 8.5mW at a sampling rate of 1MSPS, and just Low THD: -83dB (typ) 5W between conversions utilizing Auto Power-Down mode Pb-Free (RoHS Compliant) (with a 5V supply). The ISL267440, ISL267450A are excellent solutions for remote industrial sensors and battery-powered Available in MSOP Package instruments. Applications The ISL267440, ISL267450A are available in an 8 lead MSOP package, and are specified for operation over the Industrial Remote Data Acquisition temperature range (40C to +85C). Battery Operated Systems Industrial Process Control Energy Measurement Data Acquisition Systems Pressure Sensors Flow Controllers 1.0 0.8 0.6 0.4 VREF VDD 0.2 0.0 -0.2 VIN+ SCLK SAR SERIAL SDATA -0.4 LOGIC INTERFACE VIN CS -0.6 -0.8 VREF -1.0 0 1024 2048 3072 4096 GND CODE FIGURE 1. BLOCK DIAGRAM FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE FN7708 Rev.2.00 Page 1 of 18 June 28, 2012 DAC DAC DNL (LSB)ISL267440, ISL267450A Typical Connection Diagram 0.1F +3V/5V VREF 10F SUPPLY 0.1F + VREF VDD REF VIN+ SCLK P-P REF VIN SDATA P/C P-P GND CS SERIAL INTERFACE Pin Configuration ISL267440, ISL267450A (8 LD MSOP) TOP VIEW 1 8 VDD VREF 2 7 VIN+ SCLK 3 6 VIN SDATA GND 4 5 CS Pin Descriptions ISL267440, ISL267450A PIN NAME PIN NUMBER DESCRIPTION VDD 8 Supply voltage, +2.7V to 5.25V. SCLK 7 Serial clock input. Controls digital I/O timing and clocks the conversion. SDATA 6 Digital conversion output. CS 5 Chip select input. Generally controls the start of a conversion though not always the sampling signal. GND 4 Ground VIN 3 Negative analog input. VIN+ 2 Positive analog input. VREF 1 Reference voltage. FN7708 Rev.2.00 Page 2 of 18 June 28, 2012