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LTC2489CDE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC2489
1
2489fb
For more information www.linear.com/LTC2489
16-Bit 2-/4-Channel
DΣ
ADC
with Easy Drive Input Current
Cancellation and I
2
C Interface
Typical applicaTion
FeaTures
applicaTions
DescripTion
The LT C
®
2489 is a 4-channel (2-channel differential),
16-bit, No Latency DΣ™ ADC with Easy Drive technology
and a 2-wire, I
2
C interface. The patented sampling scheme
eliminates dynamic input current errors and the shortcom-
ings of on-chip buffering through automatic cancellation of
differential input current. This allows large external sour
ce
impedances and rail-to-rail input signals to be directly
digitized while maintaining exceptional DC accuracy.
The LTC2489 includes an integrated oscillator. This device
can be configured to measure an external signal from com
-
binations of 4 analog input channels operating in single-
ended or differential modes. It automatically rejects line
frequencies of 50Hz and 60Hz simultaneously.
The L
TC2489 allows a wide, common mode input range
(0V to V
CC
), 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Easy Drive and No Latency
DΣ are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Data Acquisition System with Temperature Compensation
n
Up to 2 Differential or 4 Single-Ended Inputs
n
Easy Drive
TM
Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
n
Directly Digitizes High Impedance Sensors with
Full Accuracy
n
2-Wire I
2
C Interface with 9 Addresses Plus One
Global Address for Synchronization
n
600nV RMS Noise (0.02LSB Transition Noise)
n
GND to V
CC
Input/Reference Common Mode Range
n
Simultaneous 50Hz/60Hz Rejection
n
2ppm INL, No Missing Codes
n
1ppm Offset and 15ppm Full-Scale Error
n
No Latency: Digital Filter Settles in a Single Cycle,
Even After a New Channel is Selected
n
Single Supply, 2.7V to 5.5V Operation (0.8mW)
n
Internal Oscillator
n
Tiny 4mm × 3mm DFN Package
n
Direct Sensor Digitizer
n
Direct Temperature Measurement
n
Instrumentation
n
Industrial Process Control
+FS Error vs R
SOURCE
at IN
+
and IN
–
SDA
SCL
f
O
REF
+
V
CC
2.7V TO 5.5V
0.1µF
COM
REF
–
16-BIT ∆Σ ADC
WITH EASY-DRIVE
4-CHANNEL
MUX
IN
+
IN
–
2489 TA01a
2-WIRE
I
2
C INTERFACE
1.7k
CA1
CA0
9-PIN SELECTABLE
ADDRESSES
CH0
CH1
CH3
CH2
10µF
OSC
R
SOURCE
(Ω)
1
+FS ERROR (ppm)
–20
0
20
1k 100k
2489 TA01b
–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
LTC2489
2
2489fb
For more information www.linear.com/LTC2489
absoluTe MaxiMuM raTings
(Notes 1, 2)
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2489CDE#PBF LTC2489CDE#TRPBF 2489 14-Lead (4mm × 3mm) Plastic DFN 0°C to 70°C
LTC2489IDE#PBF LTC2489IDE#TRPBF 2489 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/
1
2
3
4
5
6
7
14
13
12
11
10
9
8
REF
–
REF
+
V
CC
CH3
CH2
CH1
CH0
f
O
CA0
CA1
SCL
SDA
GND
COM
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
15
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
Supply Voltage (V
CC
) ................................... –0.3V to 6V
Analog Input Voltage
(CH0 to CH3, COM)
................... –0.3V to (V
CC
+ 0.3V)
REF
+
, REF
–
....................................–0.3V to (V
CC
+ 0.3V)
Digital Input Voltage......................–0.3V to (V
CC
+ 0.3V)
Digital Output Voltage ...................–0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC2489C
................................................ 0°C to 70°C
LTC2489I
.............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguraTion
LTC2489
3
2489fb
For more information www.linear.com/LTC2489
elecTrical characTerisTics
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 CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 0.1V ≤ V
REF
≤ V
CC
, –FS ≤ V
IN
≤ +FS (Note 5) 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 13)
l
0.5 2.5 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
+
= 0.25V
REF
, IN
–
= 0.75V
REF
l
32 ppm of V
REF
Negative Full-Scale Error Drift 2.5V ≤ V
REF
≤ V
CC
, IN
+
= 0.25V
REF
, IN
–
= 0.75V
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
15
15
ppm of V
REF
ppm of V
REF
ppm of V
REF
Output Noise 2.7V < V
CC
< 5.5V, 2.5V ≤ V
REF
≤ V
CC
,
GND ≤ IN
+
= IN
–
≤ V
CC
(Note 12)
0.6 µV
RMS
converTer characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
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 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 (Notes 7, 9) 120 dB
Power Supply Rejection, 60Hz ±2% V
REF
= 2.5V, IN
+
= IN
–
= GND (Notes 8, 9) 120 dB
analog inpuT anD reFerence
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
+
Absolute/Common Mode IN
+
Voltage
(IN
+
Corresponds to the Selected Positive Input Channel)
GND – 0.3V V
CC
+ 0.3V V
IN
–
Absolute/Common Mode IN
–
Voltage
(IN
–
Corresponds to the Selected Negative Input Channel or
COM)
GND – 0.3V V
CC
+ 0.3V V
V
IN
Input Voltage Range (IN
+
– IN
–
) Differential/Single-Ended
l
–FS +FS V
FS Full Scale of the Input (IN
+
– IN
–
) Differential/Single-Ended
l
0.5V
REF
V
LSB Least Significant Bit of the Output Code
l
FS/2
16
REF
+
Absolute/Common Mode REF
+
Voltage
l
0.1 V
CC
V
REF
–
Absolute/Common Mode REF
–
Voltage
l
GND REF
+
– 0.1V V
V
REF
Reference Voltage Range (REF
+
– REF
–
)
l
0.1 V
CC
V
CS(IN
+
) IN
+
Sampling Capacitance 11 pF
CS(IN
–
) IN
–
Sampling Capacitance 11 pF
CS(V
REF
) V
REF
Sampling Capacitance 11 pF
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LTC2489CDE#PBF

Mfr. #:
Buy LTC2489CDE#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 16-bit, 4-ch I2C Delta Sigma ADC
Lifecycle:
New from this manufacturer.
Delivery:
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