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Linear Technology Electronic Components Datasheet

LTC2499 Datasheet

24-Bit 8-/16-Channel ADC

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LTC2499
FEATURES
24-Bit 8-/16-Channel
ΔΣ ADC with Easy Drive Input Current
Cancellation and I2C Interface
DESCRIPTION
n Up to Eight 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 2-Wire I2C Interface with 27 Addresses Plus One
www.DaGtlaoSbhaeletA4dU.dcroemss for Synchronization
n 600nV RMS Noise
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 5mm × 7mm QFN Package
APPLICATIONS
n Direct Sensor Digitizer
n Direct Temperature Measurement
n Instrumentation
n Industrial Process Control
The LTC®2499 is a 16-channel (eight differential), 24-bit,
No Latency ΔΣ™ 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 LTC2499 includes a high accuracy, temperature
sensor and an integrated oscillator. This device can be
configured to measure an external signal (from combi-
nations of 16 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 LTC2499 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency Δ∑ 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
COM
16-CHANNEL
MUX
TEMPERATURE
SENSOR
MUXOUT/
ADCIN
VCC
REF+
IN+
24-BIT $3 ADC
WITH EASY DRIVE
IN
REF
SDA
SCL
MUXOUT/
ADCIN
OSC
fO
2499 TA01
10μF 0.1μF
1.7k
2-WIRE
I2C INTERFACE
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
2499 TA02
2499fc
1


Linear Technology Electronic Components Datasheet

LTC2499 Datasheet

24-Bit 8-/16-Channel ADC

No Preview Available !

LTC2499
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC) ................................... –0.3V to 6V
Analog Input Voltage
(CH0-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
www.DaLTtaCS2h4ee9t94CU.c..o..m............................................ 0°C to 70°C
LTC2499I..............................................–40°C to 85°C
Storage Temperature Range...................–65°C to 150°C
PIN CONFIGURATION
TOP VIEW
GND 1
SCL 2
SDA 3
GND 4
NC 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 s 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
LTC2499CUHF#PBF
LTC2499CUHF#TRPBF 2499
38-Lead (5mm × 7mm) Plastic QFN
0°C to 70°C
LTC2499IUHF#PBF
LTC2499IUHF#TRPBF 2499
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
Negative Full-Scale Error Drift
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 13)
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
2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
l
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
0.1 ppm of VREF/°C
2499fc
2


Part Number LTC2499
Description 24-Bit 8-/16-Channel ADC
Maker Linear Technology
Total Page 30 Pages
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