company blog about ADI LTC2452IDDB Ultra-Tiny Differential 16-Bit ΔΣ ADC with SPI Interface

ADI LTC2452IDDB Ultra-Tiny Differential 16-Bit ΔΣ ADC with SPI Interface

LTC2452IDDB is an ultra-tiny, fully differential, 16-bit, analog-to-digital converter. LTC2452IDDB uses a single 2.7V to 5.5V supply and communicates through an SPI interface. The ADC is available in an 8-pin, 3mm × 2mm DFN package or TSOT-23 package. It includes an integrated oscillator that does not require any external components. It uses a delta-sigma modulator as a converter core and has no latency for multiplexed applications. The LTC2452IDDB includes a proprietary input sampling scheme that reduces the average input sampling current several orders of magnitude when compared to conventional delta-sigma converters. Additionally, due to its architecture, there is negligible current leakage between the input pins.

The LTC2452IDDB can sample at 60 conversions per second, and due to the very large oversampling ratio, has extremely relaxed anti-aliasing requirements. The LTC2452IDDB includes continuous internal offset and full-scale calibration algorithms which are transparent to the user, ensuring accuracy over time and over the operating temperature range. The converter has an external REF pin and the differential input voltage range can extend up to ±VREF .

Following a single conversion, the LTC2452IDDB can automatically enter a sleep mode and reduce its supply current to less than 0.2μA. If the user reads the ADC once a second, the LTC2452IDDB consumes an average of less than 50μW from a 2.7V supply.

Feature of LTC2452IDDB
±VCC Differential Input Range
16-Bit Resolution (Including Sign), No Missing Codes
2LSB Offset Error
4LSB Full-Scale Error
60 Conversions Per Second
Single Conversion Settling Time for Multiplexed Applications
Single-Cycle Operation with Auto Shutdown
800μA Supply Current
0.2μA Sleep Current
Internal Oscillator—No External Components Required
SPI Interface
Ultra-Tiny 3mm × 2mm DFN and TSOT-23 Packages

Applications of LTC2452IDDB
System Monitoring
Environmental Monitoring
Direct Temperature Measurements
Instrumentation
Industrial Process Control
Data Acquisition
Embedded ADC Upgrades

Functional Block Diagram of LTC2452IDDB