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Linear Integrated Systems

LTC2486 Datasheet Preview

LTC2486 Datasheet

No Latency ADC

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LTC2486
FEATURES
16-Bit 2-/4-Channel ΔΣ ADC
with PGA and Easy Drive
Input Current Cancellation
DESCRIPTION
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
600nV RMS Noise
Programmable 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 (0.8mW)
Internal Oscillator
Tiny 4mm × 3mm DFN Package
APPLICATIONS
Direct Sensor Digitizer
Direct Temperature Measurement
Instrumentation
Industrial Process Control
The LTC®2486 is a 4-channel (2-channel differential),
16-bit, No Latency ΔΣ™ 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 LTC2486 includes programmable gain, a high accuracy
temperature sensor, and an integrated oscillator. This de-
vice 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 sen-
sor. It can be programmed to reject line frequencies of 50Hz,
60Hz, or simultaneous 50Hz/60Hz, provide a programmable
gain from 1 to 256 in 8 steps, and configured to double its
output rate. The integrated temperature sensor offers 1/2°C
resolution and 2°C absolute accuracy.
The LTC2486 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 ∆Σ 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
CH0
CH1
CH2
CH3
COM
4-CHANNEL
MUX
TEMPERATURE
SENSOR
2.7V TO 5.5V
VCC
REF+
IN+
16-BIT ∆Σ ADC
WITH EASY-DRIVE
IN
REF
SDI
SCK
SDO
CS
FO
OSC
2486 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
2486 TA01b
2486f
1




Linear Integrated Systems

LTC2486 Datasheet Preview

LTC2486 Datasheet

No Latency ADC

No Preview Available !

www.DataSheet4U.com
LTC2486
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
LTC2486C ................................................ 0°C to 70°C
LTC2486I ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PACKAGE/ORDER INFORMATION
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 × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DE PART MARKING*
LTC2486CDE
LTC2486IDE
2486
2486
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
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)
16
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 20
1
0.5 5
ppm of VREF
ppm of VREF
µV
10 nV/°C
32 ppm of VREF
0.1 ppm of VREF/°C
32 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 < VCC < 2.7V, 2.5V ≤ VREF ≤ VCC,
GND ≤ IN+ = IN≤ VCC (Note 13)
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
Programmable Gain
1
256
2486f
2


Part Number LTC2486
Description No Latency ADC
Maker Linear Integrated Systems
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LTC2486 Datasheet PDF






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