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Linear Technology Electronic Components Datasheet

LTC2494 Datasheet

16-Bit 8-/16-Channel ADC

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FEATURES
Up to 8 Differential or 16 Single-Ended Inputs
Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
600nV RMS Noise
www.DaPtraoSghreaemt4Um.caobmle Gain from 1 to 256
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 Mode/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
Internal Oscillator
Tiny 5mm × 7mm QFN Package
APPLICATIONS
Direct Sensor Digitizer
Direct Temperature Measurement
Instrumentation
Industrial Process Control
LTC2494
16-Bit 8-/16-Channel ΔΣ ADC
with PGA and Easy Drive
Input Current Cancellation
DESCRIPTION
The LTC®2494 is a 16-channel (8-differential), 16-bit, No
Latency ΔΣ™ 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.
The LTC2494 includes programmable gain, a high accu-
racy temperature sensor and an integrated oscillator. This
device can be configured to measure an external signal
(from combinations of 16 analog input channels operat-
ing 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
LTC2494 can be configured to provide a progammable
gain from 1 to 256 in 8 steps.
The LTC2494 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No Latency ΔΣ 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
CH7
CH8
CH15
16-CHANNEL
MUX
COM
TEMPERATURE
SENSOR
MUXOUT/
ADCIN
VCC
REF+
IN+
16-BIT ΔΣ ADC
WITH EASY-DRIVE
IN
REF
SDI
SCK
SDO
CS
MUXOUT/
ADCIN
FO
OSC
2494 TA01a
0.1μF
10μF
4-WIRE
SPI INTERFACE
Absolute Temperature Error
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –30
–5 20 45 70
TEMPERATURE (°C)
95 120
2494 TA01b
2494fb
1


Linear Technology Electronic Components Datasheet

LTC2494 Datasheet

16-Bit 8-/16-Channel ADC

No Preview Available !

LTC2494
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC) ................................... –0.3V to 6V
Analog Input Voltage
(CH0 to CH15, COM) ................–0.3V to (VCC + 0.3V)
REF+, REF................................ –0.3V to (VCC + 0.3V)
ADCINN, ADCINP, MUXOUTP,
MUXOUTN ................................–0.3V to (VCC + 0.3V)
Digital Input Voltage......................–0.3V to (VCC + 0.3V)
Digital Output Voltage ...................–0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2494C ................................................ 0°C to 70°C
www.DaLTtaCS2he4e9t44IU..c..o..m........................................ –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
GND 1
NC 2
GND 3
GND 4
GND 5
GND 6
COM 7
CH0 8
CH1 9
CH2 10
CH3 11
CH4 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 GND
30 REF
29 REF+
28 VCC
27 MUXOUTN
26 ADCINN
25 ADCINP
24 MUXOUTP
23 CH15
22 CH14
21 CH13
20 CH12
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2494CUHF#PBF
LTC2494CUHF#TRPBF 2494
38-Lead (5mm × 7mm) Plastic QFN 0°C to 70°C
LTC2494IUHF#PBF
LTC2494IUHF#TRPBF 2494
38-Lead (5mm × 7mm) Plastic QFN –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/
2494fb
2


Part Number LTC2494
Description 16-Bit 8-/16-Channel ADC
Maker Linear Technology
Total Page 30 Pages
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