LT1236 - Precision Reference

LTC2440 - 24-Bit High Speed Differential Delta Sigma ADC with Selectable Speed/Resolution

Features

  • Click Here for LTC2440 Evaluation Kits
  • Up to 3.5kHz Output Rate
  • 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
  • Autosleep 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

Typical Application

LTC2440
LTC2440
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Description

The LTC2440 is a high speed 24-bit No Latency Delta Sigma ADC with 5ppm INL and 5µV offset. It uses 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.

Following each conversion cycle, the LTC2440 automatically enters a low power sleep state. Power dissipation may be reduced by increasing the duration of this sleep state. For example, running at the 3.5kHz conversion speed but reading data at a 100Hz rate draws 240µA average current (1.1mW) while reading data at a 7Hz output rate draws only 25µA (125µW).The LTC2440 communicates through a flexible 3-wire or 4-wire digital interface that is compatible with the LTC2410 and is available in a narrow 16-lead SSOP package.

 

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Packaging

SSOP-16

LTC2440
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC2440CGN SSOP 16 C $7.25 $5.75 View
LTC2440CGN#PBF SSOP 16 C $7.25 $5.75 View
LTC2440CGN#TR SSOP 16 C   $5.81 View
LTC2440CGN#TRPBF SSOP 16 C   $5.81 View
LTC2440IGN SSOP 16 I $8.00 $6.50 View
LTC2440IGN#PBF SSOP 16 I $8.00 $6.50 View
LTC2440IGN#TR SSOP 16 I   $6.56 View
LTC2440IGN#TRPBF SSOP 16 I   $6.56 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC570A LTC2440CGN | High Speed Delta Sigma ADC, (req DC590) $50.00
DC590B none | USB Serial Controller $125.00
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Applications

  • High Speed Multiplexing
  • Weight Scales
  • Auto Ranging 6-Digit DVMs
  • Direct Temperature Measurement
  • High Speed Data Acquisition
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Simulate

Linear Technology offers free software and demo boards that greatly simplify the task of testing and evaluating our data converters. To use these powerful tools with this product:

  • Download the QuickEval System software. The QuickEval System is a USB-based product demonstration and data acquisition system for use with Linear Technology’s A/D, D/A, LED drivers and Powered Ethernet Controllers. The software also includes web links to the appropriate device data sheets and provides an automatic update feature to keep the software current with the latest set of device drivers.

  • Request the DC590 USB Data Acquisition Controller either online or from your local sales representative. The DC590 interfaces with the USB port of your computer and connects to daughter cards for specific Linear Technology data converters.

  • Request the evaluation kit for the LTC2440 (DC570A), either online or from your local sales representative. This daughter card interfaces with the DC590 and, along with the QuickEval software package, allows easy evaluation of the part from your PC.
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