∆∑™ analog-to-digital converter with patented Easy Drive
technology and I
2
C digital interface. 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 LTC2483 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 LTC2483 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.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆∑ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Patents pending.
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Easy Drive™ Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with
Full Accuracy
600nV
RMS
Noise, Independent of V
REF
GND to V
CC
Input/Reference Common Mode Range
2-Wire I
2
C Interface
Simultaneous 50Hz/60Hz Rejection
2ppm (0.25 LSB) INL, No Missing Codes
1ppm Offset and 15ppm Full-Scale Error
No Latency: Digital Filter Settles in a Single Cycle
Single Supply 2.7V to 5.5V Operation
Internal Oscillator
Six Addresses Available
Available in a Tiny (3mm
×
3mm) 10-Lead
DFN Package
applicaTions
n
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n
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Strain Gauge Transducers
Instrumentation
Industrial Process Control
DVMs and Meters
Typical applicaTion
V
CC
0.1µF
10k
SENSE
10k
V
IN–
0.1µF
I
DIFF
= 0
REF
+
LTC2483
GND
REF
–
V
CC
1µF
SCL
SDA
CA0/F
0
CA1
2483 TA01
+FS Error vs R
SOURCE
at IN
+
and IN
–
V
CC
= 5V
60 V
REF
= 5V
V
IN+
= 3.75V
–
40 V
IN
= 1.25V
F
O
= GND
20 T
A
= 25°C
0
–20
–40
–60
–80
1
10
1k
R
SOURCE
( )
100
10k
100k
2483 TA02
80
V
IN+
2-WIRE
I
2
C INTERFACE
6 ADDRESSES
+FS ERROR (ppm)
C
IN
= 1µF
2483fc
LTC2483
absoluTe maximum raTings
(Notes 1, 2)
pin conFiguraTion
TOP VIEW
REF
+
REF
–
IN
+
IN
–
V
CC
1
2
3
4
5
11
10 CA0/F
0
9 CA1
8 GND
7 SDA
6 SCL
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
LTC2483C ................................................ 0°C to 70°C
LTC2483I .............................................– 40°C to 85°C
Storage Temperature Range.................. – 65°C to 125°C
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inFormaTion
LEAD FREE FINISH
LTC2483CDD#PBF
LTC2483IDD#PBF
LEAD BASED FINISH
LTC2483CDD
LTC2483IDD
TAPE AND REEL
LTC2483CDD#TRPBF
LTC2483IDD#TRPBF
TAPE AND REEL
LTC2483CDD#TR
LTC2483IDD#TR
PART MARKING*
LBSR
LBSR
PART MARKING*
LBSR
LBSR
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–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.
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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
PARAMETER
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
Total Unadjusted Error
CONDITIONS
0.1 ≤ V
REF
≤ V
CC
, –FS ≤ V
IN
≤ +FS (Note 5)
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)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
+
= IN
–
≤ V
CC
(Note 13)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
+
= IN
–
≤ V
CC
2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.75V
REF
, IN
–
= 0.25V
REF
2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.75V
REF
, IN
–
= 0.25V
REF
2.5V ≤ V
REF
≤ V
CC
, IN
–
= 0.75V
REF
, IN
+
= 0.25V
REF
2.5V ≤ V
REF
≤ V
CC
, IN
–
= 0.75V
REF
, IN
+
= 0.25V
REF
5V ≤ V
CC
≤ 5.5V, V
REF
= 2.5V, V
IN(CM)
= 1.25V (Note 6)
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)
5V ≤ V
CC
≤ 5.5V, V
REF
= 5V, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 12)
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l
l
elecTrical characTerisTics
MIN
16
TYP
2
1
0.5
10
MAX
10
2.5
25
UNITS
Bits
ppm of V
REF
ppm of V
REF
µV
nV/°C
ppm of V
REF
ppm of
V
REF
/°C
0.1
25
0.1
15
15
15
0.6
ppm of V
REF
ppm of
V
REF
/°C
ppm of V
REF
ppm of V
REF
ppm of V
REF
µV
RMS
2483fc
Output Noise
LTC2483
converTer characTerisTics
PARAMETER
Input Common Mode Rejection DC
Input Common Mode Rejection
50Hz ± 2%
Input Common Mode Rejection
60Hz ±2%
Input Normal Mode Rejection
50Hz ±2%
Input Normal Mode Rejection
60Hz ±2%
Input Normal Mode Rejection
50Hz/60Hz ±2%
Reference Common Mode
Rejection DC
Power Supply Rejection DC
Power Supply Rejection, 50Hz ±2%
Power Supply Rejection, 60Hz ±2%
CONDITIONS
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Notes 5, 7)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Notes 5, 8)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Notes 5, 9)
2.5V ≤ V
REF
≤ V
CC
, GND ≤ IN
–
= IN
+
≤ V
CC
(Note 5)
V
REF
= 2.5V, IN
–
= IN
+
= GND
V
REF
= 2.5V, IN
–
= IN
+
= GND (Notes 7, 9)
V
REF
= 2.5V, IN
–
= IN
+
= GND (Notes 8, 9)
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l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
MIN
140
140
140
110
110
87
120
140
120
120
120
120
120
TYP
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
analog inpuT anD reFerence
SYMBOL
IN
+
IN
–
FS
LSB
V
IN
V
REF
C
S
(IN
+
)
C
S
(IN
–
)
C
S
(V
REF
)
I
DC_LEAK
(IN
+
)
I
DC_LEAK
(IN
–
)
I
DC_LEAK
(V
REF
)
PARAMETER
Absolute/Common Mode IN
+
Voltage
Absolute/Common Mode IN
–
Voltage
Full-Scale of the Differential Input (IN
+
– IN
–
)
Least Significant Bit of the Output Code
Input Differential Voltage Range (IN
+
– IN
–
)
Reference Voltage Range (REF
+
– REF
–
)
IN
+
Sampling Capacitance
IN
–
Sampling Capacitance
V
REF
Sampling Capacitance
IN
+
DC Leakage Current
IN
–
DC Leakage Current
REF
+
, REF
–
DC Leakage Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
MIN
GND – 0.3V
GND – 0.3V
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TYP
MAX
V
CC
+ 0.3V
V
CC
+ 0.3V
UNITS
V
V
V
0.5V
REF
FS/2
16
–FS
0.1
11
11
11
+FS
V
CC
V
V
pF
pF
pF
Sleep Mode, IN
+
= GND
Sleep Mode, IN
–
= GND
Sleep Mode, V
REF
= V
CC
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–10
–10
–100
1
1
1
10
10
100
nA
nA
nA
2483fc
LTC2483
i
2
c DigiTal inpuTs anD DigiTal ouTpuTs
SYMBOL
V
IH
V
IL
V
IL(CA1)
V
IH(CA0/F0,CA1)
R
INH
R
INL
R
INF
I
I
V
HYS
V
OL
t
OF
t
SP
I
IN
C
I
C
B
C
CAX
V
IH(EXT,OSC)
V
IL(EXT,OSC)
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Low Level Input Voltage for Address Pin
High Level Input Voltage for Address Pins
Resistance from CA0/F
0
,CA1 to V
CC
to Set
Chip Address Bit to 1
Resistance from CA1 to GND to Set
Chip Address Bit to 0
Resistance from CA0/F
0
, CA1 to V
CC
or
GND to Set Chip Address Bit to Float
Digital Input Current
Hysteresis of Schmitt Trigger Inputs
Low Level Output Voltage SDA
Output Fall Time from V
IHMIN
to V
ILMAX
Input Spike Suppression
Input Leakage
Capacitance for Each I/O Pin
Capacitance Load for Each Bus Line
External Capacitive Load on Chip
Address Pins (CA0/F
0
,CA1) for Valid Float
High Level CA0/F
0
External Oscillator
Low Level CA0/F
0
External Oscillator
2.7V ≤ V
CC
< 5.5V
2.7V ≤ V
CC
< 5.5V
0.1V
CC
≤ V
IN
≤ V
CC
(Note 5)
I = 3mA
Bus Load C
B
10pF to 400pF (Note 14)
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l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over
the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
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l
l
l
l
l
l
l
MIN
0.7V
CC
TYP
MAX
0.3V
CC
0.05V
CC
UNITS
V
V
V
V
kΩ
kΩ
MΩ
0.95V
CC
10
10
2
–10
0.05V
CC
0.4
20 + 0.1C
B
250
50
1
10
400
10
V
CC
– 0.5V
0.5
10
µA
V
V
ns
ns
µA
pF
pF
pF
V
V
poWer reQuiremenTs
SYMBOL
V
CC
I
CC
PARAMETER
Supply Voltage
Supply Current
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
l
MIN
2.7
l
l
TYP
160
1
MAX
5.5
250
2
UNITS
V
µA
µA
Conversion Mode (Note 11)
Sleep Mode (Note 11)
2483fc
LTC2483
Timing characTerisTics
SYMBOL
f
EOSC
t
HEO
t
LEO
t
CONV_1
PARAMETER
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time
Simultaneous 50Hz/60Hz
External Oscillator (Note 10)
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
l
l
l
l
l
MIN
10
0.125
0.125
144.1
TYP
MAX
4000
100
100
UNITS
kHz
µs
µs
ms
ms
146.9
41036/f
EOSC
149.9
i
2
c Timing characTerisTics
SYMBOL
f
SCL
t
HD(SDA)
t
LOW
t
HIGH
t
SU(STA)
t
HD(DAT)
t
SU(DAT)
t
r
t
f
t
SU(STO)
PARAMETER
SCL Clock Frequency
Hold Time (Repeated) START Condition
LOW Period of the SCL Clock Pin
HIGH Period of the SCL Clock Pin
Set-Up Time for a Repeated START Condition
Data Hold Time
Data Set-Up Time
Rise Time for Both SDA and SCL Signals
Fall Time for Both SDA and SCL Signals
Set-Up Time for STOP Condition
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 15)
CONDITIONS
l
l
l
l
l
l
l
MIN
0
0.6
1.3
0.6
0.6
0
100
20 + 0.1C
B
20 + 0.1C
B
0.6
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
0.9
300
300
µs
ns
ns
ns
µs
(Note 14)
(Note 14)
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Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltage values are with respect to GND.
Note 3:
V
CC
= 2.7V to 5.5V unless otherwise specified.
V
REF
= REF
+
– REF
–
, V
REFCM
= (REF
+
+ REF
–
)/2, FS = 0.5V
REF
;
V
IN
= IN
+
– IN
–
, V
INCM
= (IN
+
+ IN
–
)/2.
Note 4:
Use internal conversion clock or external conversion clock source
with f
EOSC
= 307.2kHz unless otherwise specified.
Note 5:
Guaranteed by design, not subject to test.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 7:
50Hz f
EOSC
= 256kHz ±2% (external oscillator).
Note 8:
60Hz f
EOSC
= 307.2kHz ±2% (external oscillator).
Note 9:
Simultaneous 50Hz/60Hz (internal oscillator) or f
EOSC
= 280kHz
±2% (external oscillator).
Note 10:
The external oscillator is connected to the CA0/F
0
pin. The
external oscillator frequency, f
EOSC
, is expressed in kHz.
Note 11:
The converter uses the internal oscillator.
Note 12:
The output noise includes the contribution of the internal
