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LTC2488CDE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC2488
1
2488fb
For more information www.linear.com/LTC2488
R
SOURCE
(Ω)
1
+FS ERROR (ppm)
–20
0
20
1k 100k
2488 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
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
16-Bit 2-/4-Channel ΔS
ADC with Easy Drive Input
Current Cancellation
The LT C
®
2488 is a 4-channel (2-channel differential),
16-bit, No Latency ΔS™ 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 LTC2488 includes an integrated oscillator. This device
can be configured to measure an external signal from
combinations of 4 analog input channels operating in single
ended or differential modes. It automatically rejects line
frequencies of 50Hz and 60Hz simultaneously.
The LTC2488 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
selection is valid.
Data Acquisition System
n
Up to 2 Differential or 4 Single-Ended Inputs
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 (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
Fullscale Error vs Source Resistance
SDI
SCK
SDO
CS
F
O
REF
+
V
CC
2.7V TO 5.5V
10µF
COM
REF
–
16-BIT ΔΣ ADC
WITH EASY DRIVE
4-CHANNEL
MUX
IN
+
IN
–
2488 TA01a
4-WIRE
SPI INTERFACE
CH0
CH1
CH3
CH2
0.1µF
OSC
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
No Latency ΔS and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC2488
2
2488fb
For more information www.linear.com/LTC2488
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
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
LTC24
88C
................................................ 0°C to 70°C
LTC2488I
.............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
(Notes 1, 2)
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 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
+
= 0.25V
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 13)
0.6 µV
RMS
PIN CONFIGURATION
1
2
3
4
5
6
7
14
13
12
11
10
9
8
REF
–
REF
+
V
CC
CH3
CH2
CH1
CH0
F
O
SDI
SCK
CS
SDO
GND
COM
DE PACKAGE
14-LEAD (4mm x 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
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2488CDE#PBF LTC2488CDE#TRPBF 2488 14-Lead (4mm × 3mm) Plastic DFN 0°C to 70°C
LTC2488IDE#PBF LTC2488IDE#TRPBF 2488 14-Lead (4mm × 3mm) Plastic DFN –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LT C 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/
LTC2488
3
2488fb
For more information www.linear.com/LTC2488
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 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 (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
C
S(IN+)
IN
+
Sampling Capacitance 11 pF
C
S(IN–)
IN
–
Sampling Capacitance 11 pF
C
S(VREF)
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(REF
+
)
REF
+
DC Leakage Current Sleep Mode, REF
+
= V
CC
l
–100 1 100 nA
I
DC_LEAK(REF
–
)
REF
–
DC Leakage Current Sleep Mode, REF
–
= GND
l
–100 1 100 nA
t
OPEN
MUX Break-Before-Make 50 ns
QIRR MUX Off Isolation V
IN
= 2V
P-P
DC to 1.8MHz 120 dB
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC2488CDE#TRPBF

Mfr. #:
Buy LTC2488CDE#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 16-bit, 4-ch Delta Sigma ADC
Lifecycle:
New from this manufacturer.
Delivery:
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Payment:
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