LTC2440

LTC2440 24-Bit High Speed Differential ∆∑ ADC with Selectable Speed/Resolution FEATURES n Up to 3.5kHz Output Rate (External fO) n Selectable Speed/Resolution n 2µVRMS Noise at 880Hz Output Rate n 200nVRMS Noise at 6.9Hz Output Rate with Simultaneous 50/60Hz Rejection n 0.0005% INL, No Missing Codes n Autosleep Enables 20µA Operation at 6.9Hz n <5µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C) n Differential Input and Differential Reference with GND to VCC Common Mode Range n No Latency, Each Conversion is Accurate Even After an Input Step n Internal Oscillator—No External Components n Pin Compatible with the LTC2410 n 24-Bit ADC in Narrow 16-Lead SSOP Package APPLICATIONS n High Speed Multiplexing n Weight Scales n Auto Ranging 6-Digit DVMs n Direct Temperature Measurement n High Speed Data Acquisition DESCRIPTION The LTC®2440 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...