Datasheet LTC2472 (Analog Devices)

LTC2470/LTC2472 Selectable 208sps/833sps, 16-Bit ΔΣ ADCs with 10ppm/°C Max Precision Reference
FeaTures DescripTion
n
16-Bit Resolution
The LTC®2470/LTC2472 are small, 16-bit analog-to-digital n
Internal, High Accuracy Reference—10ppm/°C (Max)
converters with an integrated precision reference and n
Single-Ended (LTC2470) or Differential (LTC2472)
a selectable 208sps or 833sps output rate. They use a n
Selectable 208sps/833sps Output Rate
single 2.7V to 5.5V supply and communicate through a n
1mV Offset Error
SPI Interface. The LTC2470 is single-ended with a 0V to n
0.01% Gain Error
VREF input range and the LTC2472 is differential with a n Single Conversion Settling Time for Multiplexed ±VREF input range. Both ADC’s include a 1.25V integrated Applications reference with 2ppm/°C drift performance and 0.1% initial n Single-Cycle Operation with Auto Shutdown accuracy. The converters are available in a 12-pin DFN n 3.5mA (Typ) Supply Current 3mm × 3mm package or an MSOP-12 package. They n 2µA (Max) Sleep Current include an integrated oscillator and perform conversions n Internal Oscillator—No External Components with no latency for multiplexed applications. The LTC2470/ Required LTC2472 include a proprietary input sampling scheme n SPI Interface that reduces the average input current several orders of n Small 12-Lead, 3mm × 3mm DFN and MSOP magnitude when compared to conventional delta sigma Packages converters.
applicaTions
Following a single conversion, the LTC2470/LTC2472 automatically power down the converter and can also be n System Monitoring configured to power down the reference. When both the n Environmental Monitoring ADC and reference are powered down, the supply current n Direct Temperature Measurements is reduced to 200nA. n Instrumentation The LTC2470/LTC2472 include a user selectable 208sps n Industrial Process Control or 833sps output rate and due to a large oversampling n Data Acquisition ratio (8,192 at 208sps and 2,048 at 833sps) have relaxed n Embedded ADC Upgrades anti-aliasing requirements. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency ∆∑ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6208279, 6411242, 7088280, 7164378.
Typical applicaTion VREF vs Temperature
1.2520 2.7V TO 5.5V 1.2515 0.1µF 0.1µF 0.1µF 10µF 1.2510 TAGE (V) 0.1µF 1.2505 REFOUT COMP VCC IN+ SCK 1.2500 10k 10k SPI LTC2472 SDO INTERFACE 1.2495 IN– CS 0.1µF 1.2490 10k R REF– GND REFERENCE OUTPUT VOL 1.2485 24702 TA01a 1.2480–50 –30 –10 10 30 50 70 90 TEMPERATURE (°C) 24702 TA01b 24702fb For more information www.linear.com/LTC2470 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Analog Inputs Power Requirements Digital Inputs and Digital Outputs Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Revision History Typical Application Related Parts