LTC2440CGN Description

The LTC2440CGN is a high-speed 24-bit No Latency ∆∑TM ADC with 5ppm INL and 5µV offset. It uses a proprietary delta-sigma architecture enabling variable speed and resolution with no latency. Ten speed/resolution combinations (6.9Hz/200nVRMS to 3.5kHz/25µVRMS) are programmed through a simple serial interface. Alternatively, by tying a single pin HIGH or LOW, a fast (880Hz/2µVRMS) or ultralow noise (6.9Hz, 200nVRMS, 50/60Hz rejection) speed/resolution combination can be easily selected. The accuracy(offset, full-scale, linearity, drift) and power dissipation are independent of the speed selected. Since there is no latency, a speed/resolution change may be made between conversions with no degradation in performance. 

LTC2440CGN Features

Up to 3.5kHz Output Rate (External fO)

Selectable Speed/Resolution

2µVRMS Noise at 880Hz Output Rate

200nVRMS Noise at 6.9Hz Output Rate with Simultaneous 50/60Hz Rejection

0.0005% INL, No Missing Codes

Auto sleep Enables 20µA Operation at 6.9Hz

<5µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)

Differential Input and Differential Reference with GND to VCC Common Mode Range

No Latency, Each Conversion is Accurate Even After an Input Step

Internal Oscillator—No External Components

Pin Compatible with the LTC2410

24-Bit ADC in Narrow 16-Lead SSOP Package

LTC2440CGN Applications

High-Speed Multiplexing

Weight Scales

Auto Ranging 6-Digit DVMs

Direct Temperature Measurement

High-Speed Data Acquisition