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LTC2439-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2439-1 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC2439-1 1 24391f 8-/16-Channel 16-Bit No Latency ∆ΣTM ADC FEATURES APPLICATIO S TYPICAL APPLICATIO The LTC ®2439-1 is a 16-channel (8-differential) micropower 16-bit ∆Σ analog-to-digital converter. It op- erates from 2.7V to 5.5V and includes an integrated oscillator, 0.12LSB INL and 1 µVRMSnoise.Itusesdelta- sigma technology and provides single cycle settling time for multiplexed applications. Through a single pin, the LTC2439-1 can be configured for better than 87dB differ- ential mode rejection at 50Hz and 60Hz ±2%, or it can be driven by an external oscillator for a user-defined rejec- tion frequency. The internal oscillator requires no external frequency setting components. The LTC2439-1 accepts any external differential reference voltage from 0.1V to VCC for flexible ratiometric and remote sensing measurement applications. It can be configured to take 8 differential channels or 16 single-ended channels. The full-scale bipolar input range is from – 0.5VREF to 0.5VREF.Thereferencecommonmodevoltage,VREFCM,and the input common mode voltage, VINCM, may be indepen- dently set between GND and VCC. The DC common mode input rejection is better than 140dB. The LTC2439-1 communicates through a flexible 4-wire digital interface that is compatible with SPI and MICROWIRE TM protocols. s Direct Sensor Digitizer s Weight Scales s Direct Temperature Measurement s Gas Analyzers s Strain Gauge Transducers s Instrumentation s Data Acquisition s Industrial Process Control , LTC and LT are registered trademarks of Linear Technology Corporation. s 16-Channel Single-Ended or 8-Channel Differential Inputs s Low Supply Current (200 µA, 4µA in Autosleep) s Rail-to-Rail Differential Input/Reference s 16-Bit No Missing Codes s 1 µV RMS Noise, 16-ENOBS Independent of VREF s Very Low Transition Noise: Less Than 0.02LSB s Operates with a Reference as Low as 100mV with 1.5 µV LSB Step Size s Guaranteed Modulator Stability and Lock-Up Immunity for Any Input and Reference Conditions s Single Supply 2.7V to 5.5V Operation s Internal Oscillator—No External Components Required s 87dB Min, 50Hz and 60Hz Simultaneous Notch Filter s Pin Compatible with the 24-Bit LTC2418 s 28-Lead SSOP Package No Latency ∆Σ is a trademark of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. Minimum Resolvable Signal vs VREF SDI SCK SDO CS FO REF+ VCC 9 11 2.7V TO 5.5V 20 18 17 16 19 1 µF COM REF – GND 10 THERMOCOUPLE 12 15 DIFFERENTIAL 16-BIT ∆Σ ADC + – 241418 TA01a 4-WIRE SPI INTERFACE LTC2439-1 = EXTERNAL OSCILLATOR = 50Hz and 60Hz REJECTION CH0 CH1 • • • • • • 21 22 CH7 CH8 28 1 CH15 8 16-CHANNEL MUX VREF (V) 0 *FOR VREF = 0.4V RESOLUTION IS LIMITED BY STEP SIZE 0 10 30 40 50 2 4 5 90 24361 TA02 20 13 60 70 80 DESCRIPTIO |
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