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Linear Technology Electronic Components Datasheet

LTC2489 Datasheet

16-Bit 2-/4-Channel ADC

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LTC2489
16-Bit 2-/4-Channel ADC
with Easy Drive Input Current
Cancellation and I2C Interface
Features
Description
n Up to 2 Differential or 4 Single-Ended Inputs
n Easy DriveTM Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n 2-Wire I2C Interface with 9 Addresses Plus One
Global Address for Synchronization
n 600nV RMS Noise (0.02LSB Transition Noise)
n GND to VCC Input/Reference Common Mode Range
n Simultaneous 50Hz/60Hz Rejection
n 2ppm INL, No Missing Codes
n 1ppm Offset and 15ppm Full-Scale Error
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®2489 is a 4-channel (2-channel differential),
16-bit, No Latency DS™ ADC with Easy Drive technology
and a 2-wire, I2C interface. The patented sampling scheme
eliminates dynamic input current errors and the shortcom-
ings 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 LTC2489 includes an integrated oscillator. This device
can be configured to measure an external signal from com-
binations of 4 analog input channels operating in single-
ended or differential modes. It automatically rejects line
frequencies of 50Hz and 60Hz simultaneously.
The LTC2489 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
optional external amplifiers to be shared between all
analog inputs and auto calibration continuously removes
their associated offset and drift.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Easy Drive and No Latency ∆Σ 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
CH2
CH3
COM
4-CHANNEL
MUX
VCC
0.1µF
10µF
IN+ REF+
16-BIT ∆Σ ADC
WITH EASY-DRIVE
INREF
OSC
SDA
SCL
CA1
CA0
fO
2489 TA01a
1.7k
2-WIRE
I2C INTERFACE
9-PIN SELECTABLE
ADDRESSES
+FS Error vs RSOURCE at IN+ and IN
80 VCC = 5V
60
40
VVVRIINNE+–F
=
=
=
5V
3.75V
1.25V
fO = GND
20 TA = 25°C
0
CIN = 1µF
–20
–40
–60
–80
1
10 100 1k 10k 100k
RSOURCE (Ω)
2489 TA01b
For more information www.linear.com/LTC2489
2489fb
1


Linear Technology Electronic Components Datasheet

LTC2489 Datasheet

16-Bit 2-/4-Channel ADC

No Preview Available !

LTC2489
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage (VCC).................................... –0.3V to 6V
Analog Input Voltage
(CH0 to CH3, COM)....................–0.3V
REF+, REF.....................................–0.3V
to
to
(VCC
(VCC
+
+
0.3V)
0.3V)
Digital Input Voltage......................–0.3V to (VCC + 0.3V)
Digital Output Voltage....................–0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2489C................................................. 0°C to 70°C
LTC2489I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
fO 1
CA0 2
14 REF
13 REF+
CA1 3
12 VCC
SCL 4
15 11 CH3
SDA 5
10 CH2
GND 6
9 CH1
COM 7
8 CH0
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2489CDE#PBF
LTC2489CDE#TRPBF
2489
14-Lead (4mm × 3mm) Plastic DFN 0°C to 70°C
LTC2489IDE#PBF
LTC2489IDE#TRPBF
2489
14-Lead (4mm × 3mm) Plastic DFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2489fb
2 For more information www.linear.com/LTC2489


Part Number LTC2489
Description 16-Bit 2-/4-Channel ADC
Maker Linear Technology
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LTC2489 Datasheet PDF






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