ISL2671286
12-Bit, 20kSPS SAR ADC
The ISL2671286 is a sampling SAR-type ADC which features
excellent linearity over supply and temperature variations, and
provides a drop-in compatible alternative to all ADS1286
performance grades. The robust high impedance input
minimizes errors due to leakage currents, and specified
measurement accuracy is maintained with input signals up to
the supply rails.
The reference accepts inputs between 1.25V to 5.0V, providing
design flexibility in a wide variety of applications. The
ISL2671286 also features up to 8kV Human Body Model ESD
survivability.
The serial digital interface is SPI compatible and is easily
interfaced to all popular FPGAs and microcontrollers.
Operating from a 5V supply, power dissipation is 1.4mW at a
sampling rate of 20kSPS and just 15µW between conversions
utilizing the Auto Power-Down mode. These features make the
ISL2671286 an excellent solution for remote industrial
sensors and battery-powered instruments.
The ISL2671286 is available in an 8 Ld SOIC package and is
specified for operation over the industrial temperature range
of –40°C to +85°C.
DATASHEET
FN7863
Rev 0.00
November 1, 2011
Features
• Drop-In Compatible with ADS1286 (All Performance Grades)
• Simple SPI-compatible Serial Digital Interface
• Guaranteed No Missing Codes
• 20kHz Sampling Rate
• +4.50V to +5.25V Supply
• Low 280µA Operating Current (20kSPS)
• Power-down Current between Conversions: 3µA
• Excellent Differential Non-Linearity (0.75LSB Max)
• Low THD: -83dB (Typ)
• Pb-Free (RoHS Compliant)
• Available in SOIC Package
Applications
• Remote Data Acquisition
• Battery Operated Systems
• Industrial Process Control
• Energy Measurement
• Data Acquisition Systems
• Pressure Sensors
• Flow Controllers
VREF
+VCC
+IN DCLOCK
SAR
LOGIC
SERIAL
INTERFACE
DOUT
–IN CS/SHDN
VREF
GND
FIGURE 1. BLOCK DIAGRAM
3
2
1
0
-1
-2
-3
0
512 1024 1536 2048 2560 3072 3584
CODE
FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE
4096
FN7863 Rev 0.00
November 1, 2011
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