DATASHEET ISL2671286 FN7863 Rev 0.00 12-Bit, 20kSPS SAR ADC November 1, 2011 The ISL2671286 is a sampling SAR-type ADC which features Features excellent linearity over supply and temperature variations, and Drop-In Compatible with ADS1286 (All Performance Grades) provides a drop-in compatible alternative to all ADS1286 performance grades. The robust high impedance input Simple SPI-compatible Serial Digital Interface minimizes errors due to leakage currents, and specified Guaranteed No Missing Codes measurement accuracy is maintained with input signals up to 20kHz Sampling Rate the supply rails. +4.50V to +5.25V Supply The reference accepts inputs between 1.25V to 5.0V, providing design flexibility in a wide variety of applications. The Low 280A Operating Current (20kSPS) ISL2671286 also features up to 8kV Human Body Model ESD Power-down Current between Conversions: 3A survivability. Excellent Differential Non-Linearity (0.75LSB Max) The serial digital interface is SPI compatible and is easily Low THD: -83dB (Typ) interfaced to all popular FPGAs and microcontrollers. Operating from a 5V supply, power dissipation is 1.4mW at a Pb-Free (RoHS Compliant) sampling rate of 20kSPS and just 15W between conversions Available in SOIC Package utilizing the Auto Power-Down mode. These features make the ISL2671286 an excellent solution for remote industrial Applications sensors and battery-powered instruments. Remote Data Acquisition The ISL2671286 is available in an 8 Ld SOIC package and is Battery Operated Systems specified for operation over the industrial temperature range Industrial Process Control of 40C to +85C. Energy Measurement Data Acquisition Systems Pressure Sensors Flow Controllers 3 2 VREF +VCC 1 0 +IN DCLOCK SAR SERIAL -1 DOUT LOGIC INTERFACE IN CS/SHDN -2 VREF -3 GND 0 512 1024 1536 2048 2560 3072 3584 4096 CODE FIGURE 1. BLOCK DIAGRAM FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE FN7863 Rev 0.00 Page 1 of 15 November 1, 2011 DAC DAC DIFFERENTIAL NONLINEARITY (LSB)ISL2671286 Typical Connection Diagram VREF +5V SUPPLY + + 0.1 F 10 F VREF +VCC REF +IN DCLOCK P-P P/ C IN DOUT GND CS/SHDN SERIAL INTERFACE Pin Configuration Pin Descriptions ISL2671286 PIN (8 LD SOIC) PIN NAME NUMBER DESCRIPTION TOP VIEW VREF 1 Reference input +IN 2 Non-inverting input VREF 1 8 +VCC IN 3 Inverting input. Connect to ground or remote sense point. +IN 2 7 DCLOCK GND 4 Ground CS/SHDN 5 Chip select when low shut-down mode when IN 3 6 DOUT high. DOUT 6 Serial output data word comprises 12 bits of GND 4 5 CS/SHDN data. In operation, data is valid on falling edge of DCLOCK. Second clock pulse after falling edge of CS/SHDN enables serial output. After one null bit, data is valid for next 12 edges. DCLOCK 7 Data clock synchronizes serial data transfer. +VCC 8 Power supply Ordering Information PART NUMBER +VCC RANGE TEMP RANGE PKG. (Notes 1, 2) PART MARKING (V) (C) PACKAGE DWG. ISL2671286IBZ (Note 3) 2671286 IBZ 4.50 to 5.25 -40C to +85C 8 Ld SOIC M8.15 Coming Soon 2671286 IPZ 4.50 to 5.25 -40C to +85C 8 Ld PDIP E8.3 ISL2671286IPZ NOTES: 1. Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL2671286. For more information on MSL please see Tech Brief TB363. FN7863 Rev 0.00 Page 2 of 15 November 1, 2011 +