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LTC2498
1
2498ff
Features
applications
Description
24-Bit 8-/16-Channel ΔS
ADC with Easy Drive Input
Current Cancellation
The LTC2498 is a 16-channel (8-differential) 24-bit No
Latency ΔS ADC with Easy Drive technology. The pat-
ented 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.
TheLTC2498includesahighaccuracytemperaturesensor
and an integrated oscillator. This device can be configured
to measure an external signal (from combinations of 16
analog input channels operating in single ended or dif-
ferential modes) or its internal temperature sensor. The
integrated temperature sensor offers 1/30th °C resolution
and 2°C absolute accuracy.
The LTC2498 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 is
selected is valid. Access to the multiplexer output enables
optionalexternalamplifierstobesharedbetweenallanalog
inputs and auto calibration continuously removes their
associated offset and drift.
Data Acquisition System with Temperature Compensation
n
Up to 8 Differential or 16 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
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 (15Hz Using Internal Oscillator)
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 QFN 5mm × 7mm Package
n
Direct Sensor Digitizer
n
Direct Temperature Measurement
n
Instrumentation
n
Industrial Process Control
Internal Sensor
Absolute Temperature Error
fO
REF+
VCC
MUXOUT/
ADCIN
MUXOUT/
ADCIN
2.7V TO 5.5V
10F
COM
REF–
24-BIT
Σ ADC
WITH EASY DRIVE
16-CHANNEL
MUX
TEMPERATURE
SENSOR
IN+
IN–
2498 TA01a
CH0
CH1
CH7
CH8
CH15
0.1F
OSC
SDI
SCK
SDO
CS
4-WIRE
SPI INTERFACE
TEMPERATURE (°C)
–55 –30
–5
ABSOLUTE
ERROR
(°C)
5
4
3
2
1
–4
–3
–2
–1
0
120
95
70
45
20
2498 TA01b
–5
typical application
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∑ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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