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Linear Technology Electronic Components Datasheet

LTC2487 Datasheet

16-Bit 2-/4-Channel ADC

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LTC2487
FEATURES
16-Bit 2-/4-Channel DS ADC
with PGA, Easy Drive and
I2C Interface
DESCRIPTION
n Up to 2 Differential or 4 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 2-Wire I2C Interface with 9 Addresses Plus One
Global Address for Synchronization
n 600nV RMS Noise
n Programmable Gain from 1 to 256
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/Reduced Power Mode (15Hz Using Internal
Oscillator and 80µA at 7.5Hz Output)
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®2487 is a 4-channel (2 differential), 16-bit,
No Latency ∆S™ 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 LTC2487 includes programmable gain, a high accuracy
temperature sensor and 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) or its internal temperature
sensor. The integrated temperature sensor offers 1/2°C
resolution and 2°C absolute accuracy. The LTC2487 can
be configured to provide a programmable gain from 1 to
256 in 8 steps.
The LTC2487 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.
All registered trademarks and 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
IN+ REF+
16-BIT ∆Σ ADC
WITH EASY-DRIVE
INREF
OSC
SDA
SCL
CA1
CA0
fO
2487 TA01a
0.1µF
10µF
1.7k
2I2-CWIINRTEERFACE
9-PIN SELECTABLE
ADDRESSES
Built-In 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
2487 TA02
For more information www.linear.com/LTC2487
2487fg
1


Linear Technology Electronic Components Datasheet

LTC2487 Datasheet

16-Bit 2-/4-Channel ADC

No Preview Available !

LTC2487
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
LTC2487C................................................. 0°C to 70°C
LTC2487I..............................................–40°C to 85°C
Storage Temperature 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, qJA = 37°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC2487#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2487CDE#PBF
LTC2487CDE#TRPBF
2487
14-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LTC2487IDE#PBF
LTC2487IDE#TRPBF
2487
14-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2487fg
2 For more information www.linear.com/LTC2487


Part Number LTC2487
Description 16-Bit 2-/4-Channel ADC
Maker Linear Technology
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LTC2487 Datasheet PDF






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