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Linear Technology Electronic Components Datasheet

LTC2493 Datasheet

24-Bit 2-/4-Channel ADC

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LTC2493
Features
24-Bit 2-/4-Channel
DS
ADC with Easy Drive
Cancellation and
Input Current
I2C Interface
Description
Up to 2 Differential or 4 Single-Ended Inputs
Easy DriveTM Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
2-Wire I2C Interface with 9 Addresses Plus One
www.DaGtlaoSbhaeletA4dU.dcroemss for Synchronization
600nV RMS Noise
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/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
Applications
Direct Sensor Digitizer
Direct Temperature Measurement
Instrumentation
Industrial Process Control
The LTC®2493 is a 4-channel (2-channel differential), 24-bit,
No Latency DSTM ADC with Easy Drive technology and a
2-wire, I2C interface. The patented sampling scheme elimi-
nates 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 LTC2493 includes a high accuracy temperature
sensor and an integrated oscillator. This device can be
configured to measure an external signal (from combi-
nations of 4 analog input channels operating in single-
ended or differential modes) or its internal temperature
sensor. The integrated temperature sensor offers 1/30th
°C resolution and 2°C absolute accuracy.
The LTC2493 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 en-
ables optional external amplifiers to be shared between all
analog inputs and auto calibration continuously removes
their associated offset and drift.
, LT, LTC and LTM 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
CH2
CH3
COM
4-CHANNEL
MUX
TEMPERATURE
SENSOR
VCC
0.1µF
10µF
IN+ REF+
24-BIT ∆Σ ADC
WITH EASY-DRIVE
INREF
OSC
SDA
SCL
CA1
CA0
FO
2493 vTA01a
1.7k
2-WIRE
I2C INTERFACE
9-PIN SELECTABLE
ADDRESSES
Integrated High Performance Temperature Sensor
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –30
–5 20 45 70
TEMPERATURE (°C)
95 120
2493 TA02
2493fa



Linear Technology Electronic Components Datasheet

LTC2493 Datasheet

24-Bit 2-/4-Channel ADC

No Preview Available !

LTC2493
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage (VCC).................................... –0.3V to 6V
Analog Input Voltage
(CH0 to CH3, COM)...................
REF+, REF....................................
–0.3V
–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
LTC2493C................................................. 0°C to 70°C
LTC2493I.............................................. –40°C to 85°C
wwwS.DtoartaagSheeTeet4mUp.ceormature Range................... –65°C to 150°C
pIN CONFIGURATION
FO
CA0
CA1
SCL
SDA
GND
COM
1
2
3
4
5
6
7
14 REF
13 REF+
12 VCC
15 11 CH3
10 CH2
9 CH1
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
LTC2493CDE#PBF
LTC2493IDE#PBF
LTC2493CDE#TRPBF
LTC2493IDE#TRPBF
2493
2493
14-Lead (4mm × 3mm) Plastic DFN
14-Lead (4mm × 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
2493fa



Part Number LTC2493
Description 24-Bit 2-/4-Channel ADC
Maker Linear Technology
Total Page 30 Pages
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