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LTC2445 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2445 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC2444/LTC2445/ LTC2448/LTC2449 1 sn2444589 2444589fs FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO ■ High Speed Multiplexing ■ Weight Scales ■ Auto Ranging 6-Digit DVMs ■ Direct Temperature Measurement ■ High Speed Data Acquisition ■ Up to 8 Differential or 16 Single-Ended Input Channels ■ Up to 8kHz Output Rate ■ Up to 4kHz Multiplexing Rate ■ Selectable Speed/Resolution ■ 2µVRMS 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 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 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 24-Bit High Speed 8-/16-Channel ∆Σ ADCs with Selectable Speed/Resolution The LTC ®2444/LTC2445/LTC2448/LTC2449 are 8-/16- channel (4-/8-differential) high speed 24-bit No Latency ∆Σ TM ADCs. They use a proprietary delta-sigma architec- ture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution combinations 6.9Hz/280nVRMS to 3.5kHz/25µVRMS (4kHz with external oscillator) can be selected with no latency between con- version 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 chan- nels can be scanned at a rate of 500Hz. At the conclusion of each conversion, the converter is internally reset elimi- nating any memory effects between successive conver- sions and assuring stability of the high order delta-sigma modulator. , LTC and LT are registered trademarks of Linear Technology Corporation. LTC2444/LTC2448 Speed vs RMS Noise Simple 24-Bit Variable Speed Data Acquisition System SDI SCK SDO CS FO REF+ VCC 4.5V TO 5.5V 1µF COM REF – GND THERMOCOUPLE VARIABLE SPEED/ RESOLUTION DIFFERENTIAL 24-BIT ∆Σ ADC 16-CHANNEL MUX + – 2444 TA01 4-WIRE SPI INTERFACE LTC2448 = EXTERNAL OSCILLATOR = INTERNAL OSCILLATOR (SIMULTANEOUS 50Hz/60Hz REJECTION AT 6.9Hz OUTPUT RATE) CH0 CH1 • • • • • • CH7 CH8 CH15 CONVERSION RATE (Hz) 1 0.1 1 10 100 10 100 2440 TA02 1000 10000 2.8µV AT 880Hz 280nV AT 6.9Hz (50/60Hz REJECTION) VCC = 5V VREF = 5V VIN + = V IN – = 0V 2X SPEED MODE NO LATENCY MODE No Latency ∆Σ is a trademark of Linear Technology Corporation. |
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