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LTC2482CDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LTC2482
1
2482fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
16-Bit ΔΣ ADC with
Easy Drive Input Current
Cancellation
+FS Error vs R
SOURCE
at IN
+
and IN
–
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, Independent of V
REF
n
Operates with a Reference as Low as 100mV with
16-Bit Resolution
n
GND to V
CC
Input/Reference Common Mode Range
n
Simultaneous 50Hz/60Hz Rejection Mode
n
2ppm INL, No Missing Codes
n
1ppm Offset and 15ppm Total Unadjusted Error
n
No Latency: Digital Filter Settles in a Single Cycle
n
Single Supply 2.7V to 5.5V Operation
n
Internal Oscillator
n
Available in a Tiny (3mm × 3mm) 10-Lead
DFN Package
n
Direct Sensor Digitizer
n
Weight Scales
n
Direct Temperature Measurement
n
Strain Gauge Transducers
n
Instrumentation
n
Industrial Process Control
n
DVMs and Meters
The LTC
®
2482 combines a 16-bit plus sign No Latency ΔΣ
™
analog-to-digital converter with patented 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 input signals with rail-to-rail input range to be directly
digitized while maintaining exceptional DC accuracy.
The LTC2482 allows a wide common mode input range
(0V to V
CC
) independent of the reference voltage. The
reference can be as low as 100mV or can be tied directly
to V
CC
. The noise level is 600nV RMS independent of
V
REF
. This allows direct digitization of low level signals
with 16-bit accuracy. The LTC2482 includes an on-chip
trimmed oscillator, eliminating the need for external crystals
or oscillators and provides 87dB rejection of 50Hz and
60Hz line frequency noise. Absolute accuracy and low
drift are automatically maintained through continuous,
transparent, offset and full-scale calibration.
R
SOURCE
(Ω)
1
+FS ERROR (ppm)
–20
0
20
1k
100k
2482 TA02
–40
–60
–80
10 100 10k
40
60
80
V
CC
= 5V
V
REF
= 5V
V
IN
+
= 3.75V
V
IN
–
= 1.25V
f
O
= GND
T
A
= 25°C
C
IN
= 1μF
LTC2482
V
REF
V
CC
V
CC
GND f
O
1μF
SDO
3-WIRE
SPI INTERFACE
0.1μF
10k
I
DIFF
= 0
10k
SCK
2482 TA01
CS
SENSE
V
IN
+
V
IN
–
0.1μF
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. No Latency ΔΣ and Easy Drive are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
LTC2482
2
2482fc
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
f
O
SCK
GND
SDO
CS
*GND
V
CC
V
REF
IN
+
IN
–
T
JMAX
= 125°C, θ
JA
= 160°C/W
EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB
*PIN 1 MAY BE DRIVEN WITH A DIGITAL SIGNAL IN ORDER TO
REMAIN PIN COMPATIBLE WITH THE LTC2480/LTC2482
ELECTRICAL CHARACTERISTICS (NORMAL SPEED)
The l denotes the specifi cations which
apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C. (Notes 3, 4)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2482CDD#PBF LTC2482CDD#TRPBF LBSQ
10-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC2482IDD#PBF LTC2482IDD#TRPBF LBSQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
Supply Voltage (V
CC
) to GND ...................... –0.3V to 6V
Analog Input Voltage to GND ....... –0.3V to (V
CC
+ 0.3V)
Reference Input Voltage to GND .. –0.3V to (V
CC
+ 0.3V)
Digital Input Voltage to GND ........ –0.3V to (V
CC
+ 0.3V)
Digital Output Voltage to GND ...... –0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC2482C ............................................... 0°C to 70°C
LTC2482I ............................................ –40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 0.1 ≤ V
REF
≤ V
CC
, –FS ≤ V
IN
≤ +FS (Note 5)
l
16 Bits
Integral Nonlinearity 5V ≤ V
CC
≤ 5.5V, V
REF
= 5V, V
IN(CM)
= 2.5V (Note 6)
2.7V ≤ V
CC
≤ 5.5V, V
REF
= 2.5V, V
IN(CM)
= 1.25V (Note 6)
l
2
1
20 ppm of V
REF
ppm of V
REF
Offset Error 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
+
= IN
–
≤ V
CC
(Note 14)
l
0.5 5 μV
Offset Error Drift 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
+
= IN
–
≤ V
CC
10 nV/°C
Positive Full-Scale Error 2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.75V
REF
, IN
–
= 0.25V
REF
l
32 ppm of V
REF
Positive Full-Scale Error Drift 2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.75V
REF
, IN
–
= 0.25V
REF
0.1 ppm of
V
REF
/°C
Negative Full-Scale Error 2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.75V
REF
, IN
–
= 0.25V
REF
l
32 ppm of V
REF
Negative Full-Scale Error Drift 2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.75V
REF
, IN
–
= 0.25V
REF
0.1 ppm of
V
REF
/°C
Total Unadjusted Error 5V ≤ V
CC
≤ 5.5V, V
REF
= 2.5V, V
IN(CM)
= 1.25V
5V ≤ V
CC
≤ 5.5V, V
REF
= 5V, V
IN(CM)
= 2.5V
2.7V ≤ V
CC
≤ 5.5V, V
REF
= 2.5V, V
IN(CM)
= 1.25V
15 ppm of V
REF
ppm of V
REF
ppm of V
REF
Output Noise 5V ≤ V
CC
≤ 5.5V, V
REF
= 5V, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 13) 0.6 μV
RMS
LTC2482
3
2482fc
CONVERTER CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (Notes 3, 4)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Common Mode Rejection DC 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
l
140 dB
Input Common Mode Rejection, 50Hz ±2% 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
l
140 dB
Input Common Mode Rejection, 60Hz ±2% 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
l
140 dB
Input Normal Mode Rejection, 50Hz ±2% 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Notes 5, 7)
l
110 120 dB
Input Normal Mode Rejection, 60Hz ±2% 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Notes 5, 8)
l
110 120 dB
Input Normal Mode Rejection, 50Hz/60Hz ±2% 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Notes 5, 9)
l
87 dB
Reference Common Mode Rejection DC 2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
l
120 140 dB
Power Supply Rejection DC V
REF
= 2.5V, IN
–
= IN
+
= GND 120 dB
Power Supply Rejection, 50Hz ±2% V
REF
= 2.5V, IN
–
= IN
+
= GND (Note 7) 120 dB
Power Supply Rejection, 60Hz ±2% V
REF
= 2.5V, IN
–
= IN
+
= GND (Note 8) 120 dB
ANALOG INPUT AND REFERENCE
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
+
Absolute/Common Mode IN
+
Voltage GND – 0.3V V
CC
+ 0.3V V
IN
–
Absolute/Common Mode IN
–
Voltage GND – 0.3V V
CC
+ 0.3V V
FS Full Scale of the Differential Input (IN
+
– IN
–
)
l
0.5V
REF
V
LSB Least Signifi cant Bit of the Output Code
l
FS/2
16
V
IN
Input Differential Voltage Range (IN
+
– IN
–
)
l
–FS +FS V
V
REF
Reference Voltage Range
l
0.1 V
CC
V
C
S
(IN
+
)IN
+
Sampling Capacitance 11 pF
C
S
(IN
–
)IN
–
Sampling Capacitance 11 pF
C
S
(V
REF
)V
REF
Sampling Capacitance 11 pF
I
DC_LEAK
(IN
+
)IN
+
DC Leakage Current Sleep Mode, IN
+
= GND
l
–10 1 10 nA
I
DC_LEAK
(IN
–
)IN
–
DC Leakage Current Sleep Mode, IN
–
= GND
l
–10 1 10 nA
I
DC_LEAK
(V
REF
)V
REF
Leakage Current Sleep Mode, V
REF
= V
CC
l
–100 1 100 nA
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LTC2482CDD#TRPBF

Mfr. #:
Buy LTC2482CDD#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 16-Bit Delta Sigma ADC
Lifecycle:
New from this manufacturer.
Delivery:
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