Datasheet LTC2496 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 16-Bit 8-/16-Channel ΔΣ ADC with Easy Drive Input Current Cancellation |
| Seiten / Seite | 32 / 1 — FeaTures. DescripTion. Up to 8 Differential or 16 Single-Ended Inputs. … |
| Dateiformat / Größe | PDF / 668 Kb |
| Dokumentensprache | Englisch |
FeaTures. DescripTion. Up to 8 Differential or 16 Single-Ended Inputs. Easy Drive Technology Enables Rail-to-Rail Inputs
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LTC2496 16-Bit 8-/16-Channel ΔΣ ADC with Easy Drive Input Current Cancellation
FeaTures DescripTion
n
Up to 8 Differential or 16 Single-Ended Inputs
The LTC®2496 is a 16-channel (8-differential) 16-bit No n
Easy Drive Technology Enables Rail-to-Rail Inputs
Latency ΔΣ™ ADC with Easy Drive™ technology. The pat-
with Zero Differential Input Current
ented sampling scheme eliminates dynamic input current n
Directly Digitizes High Impedance Sensors with
errors and the shortcomings of on-chip buffering through
Full Accuracy
automatic cancellation of differential input current. This n
600nV RMS Noise (0.02 LSB Transition Noise)
allows large external source impedances, and rail-to-rail n
GND to VCC Input/Reference Common Mode Range
input signals to be directly digitized while maintaining n Simultaneous 50Hz/60Hz Rejection exceptional DC accuracy. n 2ppm INL, No Missing Codes The LTC2496 includes an integrated oscillator. This device n 1ppm Offset and 15ppm Full-Scale Error can be configured to measure an external signal (from n No Latency: Digital Filter Settles in a Single Cycle, combinations of 16 analog input channels operating in Even After a New Channel is Selected single ended or differential modes). It automatically rejects n Single Supply 2.7V to 5.5V Operation (0.8mW) line frequencies of 50Hz and 60Hz, simultaneously. n Internal Oscillator n QFN 5mm × 7mm Package The LTC2496 allows a wide common mode input range (0V to VCC), independent of the reference voltage. Any
applicaTions
combination of single-ended or differential inputs can be selected and the first conversion after a new channel is n Direct Sensor Digitizer selected is valid. Access to the multiplexer output enables n Direct Temperature Measurement optional external amplifiers to be shared between all analog n Instrumentation inputs and auto calibration continuously removes their n Industrial Process Control associated offset and drift. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion Data Acquisition System +FS Error vs RSOURCE
2.7V TO 5.5V 80 VCC = 5V 60 VREF = 5V + 0.1µF 10µF VIN = 3.75V – CH0 MUXOUT/ VCC 40 VIN = 1.25V ADCIN CH1 fO = GND • 20 TA = 25°C • • REF+ CIN = 1µF CH7 IN+ SDI 0 16-CHANNEL CH8 16-BIT ∆∑ ADC SCK MUX 4-WIRE • WITH EASY-DRIVE –20 • SDO SPI INTERFACE • +FS ERROR (ppm) IN– CH15 CS REF– –40 COM –60 f0 MUXOUT/ –80 OSC ADCIN 1 10 100 1k 10k 100k R 2496 TA01a SOURCE (Ω) 2498 TA01b 2496fc For more information www.linear.com/LTC2496 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Converter Characteristics Analog Input and Reference Digital Inputs and Digital Outputs Power Requirements Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Timing Diagrams Applications Information Package Description Revision History Typical Application Related Parts
FeaTures DescripTion
n
Up to 8 Differential or 16 Single-Ended Inputs
The LTC®2496 is a 16-channel (8-differential) 16-bit No n
Easy Drive Technology Enables Rail-to-Rail Inputs
Latency ΔΣ™ ADC with Easy Drive™ technology. The pat-
with Zero Differential Input Current
ented sampling scheme eliminates dynamic input current n
Directly Digitizes High Impedance Sensors with
errors and the shortcomings of on-chip buffering through
Full Accuracy
automatic cancellation of differential input current. This n
600nV RMS Noise (0.02 LSB Transition Noise)
allows large external source impedances, and rail-to-rail n
GND to VCC Input/Reference Common Mode Range
input signals to be directly digitized while maintaining n Simultaneous 50Hz/60Hz Rejection exceptional DC accuracy. n 2ppm INL, No Missing Codes The LTC2496 includes an integrated oscillator. This device n 1ppm Offset and 15ppm Full-Scale Error can be configured to measure an external signal (from n No Latency: Digital Filter Settles in a Single Cycle, combinations of 16 analog input channels operating in Even After a New Channel is Selected single ended or differential modes). It automatically rejects n Single Supply 2.7V to 5.5V Operation (0.8mW) line frequencies of 50Hz and 60Hz, simultaneously. n Internal Oscillator n QFN 5mm × 7mm Package The LTC2496 allows a wide common mode input range (0V to VCC), independent of the reference voltage. Any
applicaTions
combination of single-ended or differential inputs can be selected and the first conversion after a new channel is n Direct Sensor Digitizer selected is valid. Access to the multiplexer output enables n Direct Temperature Measurement optional external amplifiers to be shared between all analog n Instrumentation inputs and auto calibration continuously removes their n Industrial Process Control associated offset and drift. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion Data Acquisition System +FS Error vs RSOURCE
2.7V TO 5.5V 80 VCC = 5V 60 VREF = 5V + 0.1µF 10µF VIN = 3.75V – CH0 MUXOUT/ VCC 40 VIN = 1.25V ADCIN CH1 fO = GND • 20 TA = 25°C • • REF+ CIN = 1µF CH7 IN+ SDI 0 16-CHANNEL CH8 16-BIT ∆∑ ADC SCK MUX 4-WIRE • WITH EASY-DRIVE –20 • SDO SPI INTERFACE • +FS ERROR (ppm) IN– CH15 CS REF– –40 COM –60 f0 MUXOUT/ –80 OSC ADCIN 1 10 100 1k 10k 100k R 2496 TA01a SOURCE (Ω) 2498 TA01b 2496fc For more information www.linear.com/LTC2496 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Converter Characteristics Analog Input and Reference Digital Inputs and Digital Outputs Power Requirements Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Timing Diagrams Applications Information Package Description Revision History Typical Application Related Parts