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Linear Technology Electronic Components Datasheet

LTC2496 Datasheet

16-Bit 8-/16-Channel ADC

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LTC2496
16-Bit 8-/16-Channel
ΔΣ ADC with Easy Drive
Input Current Cancellation
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
www.Da6t0a0SnheVeRt4MU.cSoNmoise (0.02 LSB Transition Noise)
GND to VCC Input/Reference Common Mode Range
Simultaneous 50Hz/60Hz Rejection
2ppm INL, No Missing Codes
1ppm Offset and 15ppm Full-Scale Error
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
QFN 5mm × 7mm Package
APPLICATIONS
Direct Sensor Digitizer
Direct Temperature Measurement
Instrumentation
Industrial Process Control
DESCRIPTION
The LTC®2496 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 LTC2496 includes 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 differential modes). It automatically rejects
line frequencies of 50Hz and 60Hz, simultaneously.
The LTC2496 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Data Acquisition System
2.7V TO 5.5V
CH0
CH1
CH7
CH8
CH15
16-CHANNEL
MUX
COM
MUXOUT/
ADCIN
VCC
REF+
IN+
16-BIT ΔΣ ADC
WITH EASY-DRIVE
IN
REF
SDI
SCK
SDO
CS
MUXOUT/
ADCIN
F0
OSC
2496 TA01a
0.1μF
10μF
4-WIRE
SPI INTERFACE
+FS Error vs RSOURCE
80
VCC = 5V
60
40
VVVRIINNE+–F
=
=
=
5V
3.75V
1.25V
FO = GND
20 TA = 25°C
0
CIN = 1μF
–20
–40
–60
–80
1
10 100 1k 10k 100k
RSOURCE (Ω)
2498 TA01b
2496fa
1


Linear Technology Electronic Components Datasheet

LTC2496 Datasheet

16-Bit 8-/16-Channel ADC

No Preview Available !

LTC2496
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
.................................................–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)
wwwO.DpaetraaSthinegetT4eUm.copmerature Range
LTC2496C ................................................ 0°C to 70°C
LTC2496I ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PACKAGE/ORDER INFORMATION
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 PART NUMBER QFN PART MARKING*
LTC2496CUHF
LTC2496IUHF
2496
2496
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 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
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 20 ppm of VREF
1 ppm of VREF
0.5 5
μV
Offset Error Drift
Positive Full-Scale Error
Positive Full-Scale Error Drift
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
10 nV/ºC
32 ppm of VREF
0.1 ppm of VREF/°C
Negative Full-Scale Error
2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
Negative Full-Scale Error Drift 2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
32 ppm of VREF
0.1 ppm of VREF/°C
Total Unadjusted Error
Output Noise
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
5.5V ≤ VCC ≤ 2.7V, 2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC (Note 13)
15 ppm of VREF
15 ppm of VREF
15 ppm of VREF
0.6 μVRMS
2496fa
2


Part Number LTC2496
Description 16-Bit 8-/16-Channel ADC
Maker Linear Technology
Total Page 30 Pages
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