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LTC2448

Features: ` Up to 8 Differential or 16 Single-Ended Input Channels` Up to 8kHz Output Rate` Up to 4kHz Multiplexing Rate`Selectable Speed/Resolution` 2VRMS Noise at 1.76kHz Output Rate` 200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50/60Hz Rejection` Guaranteed Modulator Stability and Loc...

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SeekIC No. : 004402085 Detail

LTC2448: Features: ` Up to 8 Differential or 16 Single-Ended Input Channels` Up to 8kHz Output Rate` Up to 4kHz Multiplexing Rate`Selectable Speed/Resolution` 2VRMS Noise at 1.76kHz Output Rate` 200nVRMS Noi...

LTC2448 Data Sheet

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Part Number:
LTC2448
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` Up to 8 Differential or 16 Single-Ended Input Channels
` Up to 8kHz Output Rate
` Up to 4kHz Multiplexing Rate
` Selectable Speed/Resolution
` 2VRMS Noise at 1.76kHz Output Rate
` 200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50/60Hz Rejection
` Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions
` 0.0005% INL, No Missing Codes
` Autosleep Enables 20mA Operation at 6.9Hz
` <5V 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 Mode, Each Conversion is Accurate Even After a New Channel is Selected
` Internal Oscillator-No External Components
` LTC2445/LTC2449 Include MUXOUT/ADCIN for External Buffering or Gain
` Tiny QFN 5mm x 7mm Package


Application

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


Pinout

Connection Diagram




Specifications

Supply Voltage (VCC) to GND .......................0.3V to 6V
Analog Input Pins Voltage
     to GND .................................... 0.3V to (VCC + 0.3V)
Reference Input Pins Voltage
     to GND .................................... 0.3V to (VCC + 0.3V)
Digital Input Voltage to GND ........ 0.3V to (VCC + 0.3V)
Digital Output Voltage to GND ..... 0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2444C/LTC2445C/
LTC2448C/LTC2449C ............................... 0°C to 70°C
LTC2444I/LTC2445I/
LTC2448I/LTC2449I ............................ 40°C to 85°C
Storage Temperature Range ..............65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C


Description

The LTC®2444/LTC2445/LTC2448/LTC2449 are 8-/16- channel (4-/8-differential) high speed 24-bit No Latency TM ADCs. They use a proprietary delta-sigma architecture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution combinations 6.9Hz/280nVRMS to 3.5kHz/25VRMS (4kHz with external oscillator) can be selected with no latency between conversion results or shift in DC accuracy (offset, full-scale, linearity, drift). Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz if an external oscillator is used) with one cycle latency.

Any combination of single-ended or differential inputs can be selected with a common mode input range from ground to VCC, independent of VREF. While operating in the 1X speed mode the first conversion following a new speed, resolution, or channel selection is valid. Since there is no settling time between conversions, all 8 differential channels can be scanned at a rate of 500Hz. At the conclusion of each conversion, the converter of LTC2444/LTC2445/LTC2448/LTC2449  is internally reset eliminating any memory effects between successive conversions and assuring stability of the high order delta-sigma modulator.




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