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Linear Technology Electronic Components Datasheet

LTC2492 Datasheet

24-Bit 2-/4-Channel ADC

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FEATURES
Up to 2 Differential or 4 Single-Ended Inputs
Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
www.Da6t0a0SnheVeRt4MU.cSoNmoise
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 (0.8mW)
Internal Oscillator
Tiny DFN 4mm × 3mm Package
APPLICATIONS
Direct Sensor Digitizer
Direct Temperature Measurement
Instrumentation
Industrial Process Control
LTC2492
24-Bit 2-/4-Channel ΔΣ
ADC with Easy Drive Input
Current Cancellation
DESCRIPTION
The LTC®2492 is a 4-channel (2-channel differential),
24-bit, No Latency Δ∑™ ADC with Easy Drive™ technology.
The patented 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 LTC2492 includes a high accuracy temperature sensor
and an integrated oscillator. This device can be configured
to measure an external signal (from combinations of
4 analog input channels operating in single-ended or
differential modes) or its internal temperature sensor. It
can be programmed to reject line frequencies of 50Hz,
60Hz, or simultaneous 50Hz/60Hz and configured to double
its output rate. The integrated temperature sensor offers
1/30th °C resolution and 2°C absolute accuracy.
The LTC2492 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
selection is valid.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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
CH2
CH3
COM
4-CHANNEL
MUX
TEMPERATURE
SENSOR
VCC
REF+
IN+
24-BIT Δ∑ ADC
WITH EASY-DRIVE
IN
REF
SDI
SCK
SDO
CS
FO
OSC
2492 TA01a
10μF 0.1μF
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
2492 TA01b
2492fb
1


Linear Technology Electronic Components Datasheet

LTC2492 Datasheet

24-Bit 2-/4-Channel ADC

No Preview Available !

LTC2492
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC) ...................................– 0.3V to 6V
Analog Input Voltage
(CH0 to CH3, COM) ................. – 0.3V to (VCC + 0.3V)
REF+, REF.................................. – 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
LTC2492C ................................................ 0°C to 70°C
LTC2492I..............................................– 40°C to 85°C
wwwS.DtoartaagSheeTeet4mUp.ceormature Range...................– 65°C to 150°C
PIN CONFIGURATION
FO
SDI
SCK
CS
SDO
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 s 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
TEMPERATURE RANGE
LTC2492CDE#PBF
LTC2492CDE#TRPBF
2492
14-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LTC2492IDE#PBF
LTC2492IDE#TRPBF
2492
14-Lead (4mm × 3mm) Plastic DFN
–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 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)
0.1V ≤ VREF ≤ VCC, –FS ≤ VIN ≤ +FS (Note 5)
24
Bits
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
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
2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
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
Total Unadjusted Error
5V ≤ VCC ≤ 5.5V, VREF = 2.5V, VIN(CM) = 1.25V
5V ≤ VCC ≤ 5.5V, VREF = 5V, VIN(CM) = 2.5V
2.7V ≤ VCC ≤ 5.5V, VREF = 2.5V, VIN(CM) = 1.25V
15 ppm of VREF
15 ppm of VREF
15 ppm of VREF
Output Noise
5.5V
GND
<
VINC+C
<
=
2.7V,
IN
2.5V ≤ VREF
VCC (Note 13)
VCC,
0.6 μVRMS
Internal PTAT Signal
TA = 27°C (Note 14)
27.8 28.0 28.2
mV
Internal PTAT Temperature Coefficient
93.5 μV/°C
2492fb
2


Part Number LTC2492
Description 24-Bit 2-/4-Channel ADC
Maker Linear Technology
Total Page 30 Pages
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