LTC2497
16-Bit 8-/16-Channel
DS ADC with Easy Drive Input Current
2
Cancellation and I C Interface
FeaTures
DescripTion
The LTC®2497 is a 16-channel (eight differential), 16-bit,
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Up to Eight Differential or 16 Single-Ended Inputs
Easy DriveTM Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
TM
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No Latency DS ADC with Easy Drive technology and
2
a 2-wire, I C interface. The patented sampling scheme
eliminatesdynamicinputcurrenterrorsandtheshortcom-
ingsofon-chipbufferingthroughautomaticcancellationof
differentialinputcurrent. Thisallowslargeexternalsource
impedances and rail-to-rail input signals to be directly
digitized while maintaining exceptional DC accuracy.
2
2-Wire I C Interface with 27 Addresses Plus One
Global Address for Synchronization
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600nV RMS Noise (0.02LSB Transition Noise)
GND to V Input/Reference Common Mode Range
CC
The LTC2497 includes an integrated oscillator. This device
canbeconfiguredtomeasureanexternalsignalfromcom-
binations of 16 analog input channels operating in single-
ended or differential modes. It automatically rejects line
frequencies of 50Hz and 60Hz simultaneously.
Simultaneous 50Hz/60Hz Rejection
2ppm INL, No Missing Codes
1ppm Offset and 15ppm Full-Scale Error
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
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The LTC2497 allows a wide, common mode input range
(0V to V ), independent of the reference voltage. Any
CC
combination of single-ended or differential inputs can be
selected and the first conversion, after a new channel is
selected, isvalid. Accesstothemultiplexeroutputenables
optional external amplifiers to be shared between all
analog inputs and auto calibration continuously removes
their associated offset and drift.
Tiny 5mm × 7mm QFN Package
applicaTions
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Direct Sensor Digitizer
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Direct Temperature Measurement
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Instrumentation
Industrial Process Control
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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Typical applicaTion
Easy Drive Data Acquisition System
+FS Error vs RSOURCE at IN+ and IN–
80
2.7V TO 5.5V
V
V
V
V
= 5V
CC
= 5V
REF
60
40
20
+
= 3.75V
= 1.25V
IN
–
CH0
CH1
MUXOUT/
ADCIN
V
10µF
0.1µF
CC
IN
f
= GND
O
•
•
•
T
= 25°C
A
+
REF
1.7k
+
C
= 1mF
CH7
CH8
IN
IN
16-CHANNEL
MUX
0
SDA
SCL
16-BIT ∆∑ ADC
2-WIRE
2
•
•
•
WITH EASY DRIVE
I C INTERFACE
–20
–
IN
CH15
COM
–
REF
–40
–60
–80
f
O
MUXOUT/
ADCIN
OSC
2497 TA01
1
10
100
1k
10k
100k
R
(Ω)
SOURCE
2497 TA01b
2497fb
For more information www.linear.com/LTC2497
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