LTC2485 Series

24-Bit ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface

Catalog

24-Bit ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface

Part	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Mounting Type	Input Type	Number of Bits	Reference Type	Sampling Rate (Per Second)	Number of A/D Converters	Architecture	Features	Number of Inputs	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Supplier Device Package	Configuration	Data Interface
Analog Devices LTC2485CDD#TRPBF	5.5 V	2.7 V	Surface Mount	Differential	24	External	7.5 Per Second	1	Sigma-Delta	Selectable Address Temperature Sensor	1	2.7 V	5.5 V	70 °C	0 °C	10-WFDFN Exposed Pad	10-DFN (3x3)	MUX-ADC	I2C

Catalog

24-Bit ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface

Key Features

• Easy Drive™Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current

• Directly Digitizes High Impedance Sensors with Full Accuracy

• GND to VCCInput/Reference Common Mode Range

• 2-Wire I2C Interface

• Programmable 50Hz, 60Hz or Simultaneous 50Hz/60Hz Rejection Mode

• 2ppm (0.25LSB) INL, No Missing Codes

• 1ppm Offset and 15ppm Full-Scale Error

• Selectable 2x Speed Mode

• No Latency: Digital Filter Settles in a Single Cycle

• Single Supply 2.7V to 5.5V Operation

• Internal Oscillator

• Six Addresses Available and One Global Address for Synchronization

• Available in a Tiny (3mm × 3mm) 10-Lead DFN Package

Description

The LTC2485 combines a 24-bit plus sign No Latency ΔΣ™analog-to-digital converter with patented Easy Drive technology and I2C digital interface. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and input signals, with rail-to-rail input range to be directly digitized while maintaining exceptional DC accuracy.The LTC2485 includes an on-chip oscillator. The LTC2485 can be configured through an I2C interface to reject line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well as a 2x speed-up mode.The LTC2485 allows a wide common mode input range (0V to VCC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly to VCC. The LTC2485 includes an on-chip trimmed oscillator eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset and full-scale calibration.ApplicationsDirect Sensor DigitizerWeight ScalesDirect Temperature MeasurementStrain Gauge TransducersInstrumentationIndustrial Process ControlDVMs and Meters