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Linear Technology Electronic Components Datasheet

LTC2498 Datasheet

24-Bit 8-/16-Channel ADC

No Preview Available !

FEATURES
n Up to 8 Differential or 16 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 600nV RMS Noise
wwwn.DaIntateShgeraett4eUd.cHoimgh 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 Mode (15Hz Using Internal Oscillator)
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 QFN 5mm × 7mm Package
APPLICATIONS
n Direct Sensor Digitizer
n Direct Temperature Measurement
n Instrumentation
n Industrial Process Control
LTC2498
24-Bit 8-/16-Channel ΔΣ
ADC with Easy Drive Input
Current Cancellation
DESCRIPTION
The LTC®2498 is a 16-channel (8-differential) 24-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 LTC2498 includes a high accuracy temperature sensor
and an integrated oscillator. This device can be configured
to measure an external signal (from combinations of 16
analog input channels operating in single ended or dif-
ferential modes) or its internal temperature sensor. The
integrated temperature sensor offers 1/30th °C resolution
and 2°C absolute accuracy.
The LTC2498 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 and LTM are registered trademarks of Linear Technology Corporation. Δ∑ is a
trademark 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
COM
16-CHANNEL
MUX
TEMPERATURE
SENSOR
MUXOUT/
ADCIN
VCC
REF+
IN+
24-BIT ΔΣ ADC
WITH EASY-DRIVE
IN
REF
SDI
SCK
SDO
CS
MUXOUT/
ADCIN
FO
OSC
2498 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
2498 TA01b
2498fc
1


Linear Technology Electronic Components Datasheet

LTC2498 Datasheet

24-Bit 8-/16-Channel ADC

No Preview Available !

LTC2498
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)
Reference Input Voltage
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
www.DaLTtaCS2h4ee9t84CU.c..o..m............................................ 0°C to 70°C
LTC2498I.............................................. –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
LTC2498CUHF#PBF
LTC2498CUHF#TRPBF 2498
38-Lead (5mm × 7mm) Plastic QFN
0°C to 70°C
LTC2498IUHF#PBF
LTC2498IUHF#TRPBF 2498
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/
ELECTRICAL CHARACTERISTICS (NORMAL SPEED) The l denotes the specifications which
apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Resolution (No Missing Codes)
Integral Nonlinearity
Offset Error
Offset Error Drift
Positive Full-Scale Error
Positive Full-Scale Error Drift
Negative Full-Scale Error
0.1V ≤ VREF ≤ VCC, –FS ≤ VIN ≤ +FS (Note 5)
24
Bits
5V ≤ VCC ≤ 5.5V, VREF = 5V, VIN(CM) = 2.5V (Note 6)
2.7V ≤ VCC ≤ 5.5V, VREF = 2.5V, VIN(CM) = 1.25V (Note 6)
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC (Note 14)
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF, IN= 0.25VREF
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF, IN= 0.25VREF
2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
l
l
l
l
2 10
1
0.5 2.5
ppm of VREF
ppm of VREF
μV
10 nV/°C
25 ppm of VREF
0.1 ppm of VREF/°C
25 ppm of VREF
2498fc
2


Part Number LTC2498
Description 24-Bit 8-/16-Channel ADC
Maker Linear Technology
Total Page 30 Pages
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