Datasheet LTC2488 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 16-Bit 2-/4-Channel ΔΣ ADC with Easy Drive Input Current Cancellation |
| 页数 / 页 | 30 / 1 — FEATURES. DESCRIPTION. Up to 2 Differential or 4 Single-Ended Inputs. … |
| 文件格式/大小 | PDF / 399 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Up to 2 Differential or 4 Single-Ended Inputs. Easy Drive Technology Enables Rail-to-Rail Inputs
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LTC2488 16-Bit 2-/4-Channel ΔS ADC with Easy Drive Input Current Cancellation
FEATURES DESCRIPTION
n
Up to 2 Differential or 4 Single-Ended Inputs
The LTC®2488 is a 4-channel (2-channel differential), n
Easy Drive Technology Enables Rail-to-Rail Inputs
16-bit, No Latency ΔS™ ADC with Easy Drive™ technology.
with Zero Differential Input Current
The patented sampling scheme eliminates dynamic input n
Directly Digitizes High Impedance Sensors with
current errors and the shortcomings of on-chip buffering
Full Accuracy
through automatic cancel ation of differential input current. n
600nV RMS Noise (0.02LSB Transition Noise)
This allows large external source impedances and rail-to- n
GND to VCC Input/Reference Common Mode Range
rail input signals to be directly digitized while maintaining n Simultaneous 50Hz/60Hz Rejection exceptional DC accuracy. n 2ppm INL, No Missing Codes The LTC2488 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 4 analog input channels operating in single Even After a New Channel is Selected ended or differential modes. It automatically rejects line n Single Supply 2.7V to 5.5V Operation (0.8mW) frequencies of 50Hz and 60Hz simultaneously. n Internal Oscillator n Tiny 4mm × 3mm DFN Package The LTC2488 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 n selection is valid. Direct Sensor Digitizer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Direct Temperature Measurement No Latency ΔS and Easy Drive are trademarks of Linear Technology Corporation. All other n Instrumentation trademarks are the property of their respective owners. n Industrial Process Control
TYPICAL APPLICATION Data Acquisition System Fullscale Error vs Source Resistance
2.7V TO 5.5V 80 VCC = 5V 60 VREF = 5V V + 10µF 0.1µF IN = 3.75V – CH0 VCC 40 VIN = 1.25V CH1 FO = GND 20 TA = 25°C REF+ CIN = 1µF IN+ SDI 0 4-CHANNEL 16-BIT ΔΣ ADC SCK MUX 4-WIRE –20 WITH EASY DRIVE SDO SPI INTERFACE CH2 +FS ERROR (ppm) IN– CS CH3 –40 REF– COM –60 FO –80 OSC 1 10 100 1k 10k 100k RSOURCE (Ω) 2488 TA01a 2488 TA01b 2488fb For more information www.linear.com/LTC2488 1
FEATURES DESCRIPTION
n
Up to 2 Differential or 4 Single-Ended Inputs
The LTC®2488 is a 4-channel (2-channel differential), n
Easy Drive Technology Enables Rail-to-Rail Inputs
16-bit, No Latency ΔS™ ADC with Easy Drive™ technology.
with Zero Differential Input Current
The patented sampling scheme eliminates dynamic input n
Directly Digitizes High Impedance Sensors with
current errors and the shortcomings of on-chip buffering
Full Accuracy
through automatic cancel ation of differential input current. n
600nV RMS Noise (0.02LSB Transition Noise)
This allows large external source impedances and rail-to- n
GND to VCC Input/Reference Common Mode Range
rail input signals to be directly digitized while maintaining n Simultaneous 50Hz/60Hz Rejection exceptional DC accuracy. n 2ppm INL, No Missing Codes The LTC2488 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 4 analog input channels operating in single Even After a New Channel is Selected ended or differential modes. It automatically rejects line n Single Supply 2.7V to 5.5V Operation (0.8mW) frequencies of 50Hz and 60Hz simultaneously. n Internal Oscillator n Tiny 4mm × 3mm DFN Package The LTC2488 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 n selection is valid. Direct Sensor Digitizer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Direct Temperature Measurement No Latency ΔS and Easy Drive are trademarks of Linear Technology Corporation. All other n Instrumentation trademarks are the property of their respective owners. n Industrial Process Control
TYPICAL APPLICATION Data Acquisition System Fullscale Error vs Source Resistance
2.7V TO 5.5V 80 VCC = 5V 60 VREF = 5V V + 10µF 0.1µF IN = 3.75V – CH0 VCC 40 VIN = 1.25V CH1 FO = GND 20 TA = 25°C REF+ CIN = 1µF IN+ SDI 0 4-CHANNEL 16-BIT ΔΣ ADC SCK MUX 4-WIRE –20 WITH EASY DRIVE SDO SPI INTERFACE CH2 +FS ERROR (ppm) IN– CS CH3 –40 REF– COM –60 FO –80 OSC 1 10 100 1k 10k 100k RSOURCE (Ω) 2488 TA01a 2488 TA01b 2488fb For more information www.linear.com/LTC2488 1