LTC2486_15 Datasheet, PDF (1/36 Pages) Linear Technology – 16-Bit 2-/4-Channel ADC with PGA and Easy Drive Input Current Cancellation

LTC2486
FEATURES
16-Bit 2-/4-Channel ΔS ADC
with PGA and Easy Drive
Input Current Cancellation
DESCRIPTION
n _{Up to 2 Differential or 4 Single-Ended Inputs}
n _{Easy Drive Technology Enables Rail-to-Rail Inputs}
with Zero Differential Input Current
n _{Directly Digitizes High Impedance Sensors with}
Full Accuracy
n _{600nV RMS Noise}
n _{Programmable Gain from 1 to 256}
n _{Integrated High Accuracy Temperature Sensor}
n _{GND to VCC Input/Reference Common Mode Range}
n _{Programmable 50Hz, 60Hz, or Simultaneous}
50Hz/60Hz Rejection Mode
n _{2ppm INL, No Missing Codes}
n _{1ppm Offset and 15ppm Full-Scale Error}
n _{2x Speed Mode/Reduced Power Mode (15Hz Using}
Internal Oscillator and 80µA at 7.5Hz Output)
n _{No Latency: Digital Filter Settles in a Single Cycle,}
Even After a New Channel is Selected
n _{Single Supply 2.7V to 5.5V Operation (0.8mW)}
n _{Internal Oscillator}
n _{Tiny 4mm × 3mm DFN Package}
APPLICATIONS
n _{Direct Sensor Digitizer}
n _{Direct Temperature Measurement}
n _{Instrumentation}
n _{Industrial Process Control}
The LTC^®2486 is a 4-channel (2-channel differential),
16‑bit, No Latency DS™ ADC with Easy Drive™ technology.
The patented sampling scheme eliminates dynamic input
current errors and the shortcomings of on-chip buffering
through automatic cancellation of differential input current.
This allows large external source impedances and rail-to-
rail input signals to be directly digitized while maintaining
exceptional DC accuracy.
The LTC2486 includes programmable gain, a high accuracy
temperature sensor, and an integrated oscillator. This de-
vice can be configured to measure an external signal (from
combinations of 4 analog input channels operating in single
ended or differential modes) or its internal temperature
sensor. It can be programmed to reject line frequencies of
50Hz, 60Hz, or simultaneous 50Hz/60Hz, provide a pro-
grammable gain from 1 to 256 in 8 steps, and configured to
double its output rate. The integrated temperature sensor
offers 1/2°C resolution and 2°C absolute accuracy.
The LTC2486 allows a wide common mode input range
(0V to V_CC), independent of the reference voltage. Any
combination of single-ended or differential inputs can
be selected and the first conversion after a new channel
selection is valid.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. No Latency DS and Easy Drive are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Data Acquisition System with Temperature Compensation
2.7V TO 5.5V
CH0
CH1
4-CHANNEL
MUX
CH2
CH3
COM
TEMPERATURE
SENSOR
V_CC
REF⁺
IN⁺
SDI
16-BIT ∆Σ ADC SCK
WITH EASY-DRIVE SDO
IN^–
CS
REF^–
f_O
OSC
2486 TA01a
0.1µF
10µF
4-WIRE
SPI INTERFACE
Absolute Temperature Error
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –30
–5 20 45 70
TEMPERATURE (°C)
95 120
2486 TA01b
For more information www.linear.com/LTC2486
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