16-Bit 2-/4-Channel ΔΣ ADC
with PGA and Easy Drive
Input Current Cancellation
■ Up to 2 Differential or 4 Single-Ended Inputs
■ Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
■ Directly Digitizes High Impedance Sensors with
■ 600nV RMS Noise
■ Programmable Gain from 1 to 256
■ Integrated High Accuracy Temperature Sensor
■ GND to VCC Input/Reference Common Mode Range
■ Programmable 50Hz, 60Hz, or Simultaneous
50Hz/60Hz Rejection Mode
■ 2ppm INL, No Missing Codes
■ 1ppm Offset and 15ppm Full-Scale Error
■ 2x Speed Mode/Reduced Power Mode (15Hz Using
Internal Oscillator and 80µA at 7.5Hz Output)
■ No Latency: Digital Filter Settles in a Single Cycle,
Even After a New Channel is Selected
■ Single Supply 2.7V to 5.5V Operation (0.8mW)
■ Internal Oscillator
■ Tiny 4mm × 3mm DFN Package
■ Direct Sensor Digitizer
■ Direct Temperature Measurement
■ Industrial Process Control
The LTC®2486 is a 4-channel (2-channel differential),
16-bit, No Latency ΔΣ™ 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 sen-
sor. It can be programmed to reject line frequencies of 50Hz,
60Hz, or simultaneous 50Hz/60Hz, provide a programmable
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 VCC), 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Data Acquisition System with Temperature Compensation
2.7V TO 5.5V
16-BIT ∆Σ ADC
Absolute Temperature Error
–5 20 45 70