LTC2488 ADC Datasheet

LTC2488 Datasheet PDF, Equivalent


Part Number

LTC2488

Description

16-Bit 2-/4-Channel ADC

Manufacture

Linear

Total Page 30 Pages
Datasheet
Download LTC2488 Datasheet


LTC2488
FEATURES
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 VCC 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
APPLICATIONS
n Direct Sensor Digitizer
n Direct Temperature Measurement
n Instrumentation
n Industrial Process Control
LTC2488
16-Bit 2-/4-Channel ΔS
ADC with Easy Drive Input
Current Cancellation
DESCRIPTION
The LTC®2488 is a 4-channel (2-channel differential),
16‑bit, No Latency DS™ 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 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
selection is valid.
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.
TYPICAL APPLICATION
Data Acquisition System
2.7V TO 5.5V
CH0
CH1
CH2
CH3
COM
4-CHANNEL
MUX
VCC
IN+ REF+
16-BIT ΔΣ ADC
WITH EASY DRIVE
INREF
SDI
SCK
SDO
CS
FO
OSC
2488 TA01a
10µF
0.1µF
4-WIRE
SPI INTERFACE
Fullscale Error vs Source Resistance
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)
2488 TA01b
For more information www.linear.com/LTC2488
2488fb
1

LTC2488
LTC2488
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC).................................... –0.3V to 6V
Analog Input Voltage
(CH0 to CH3, COM)....................–0.3V
REF+, REF.................................–0.3V
to
to
(VCC
(VCC
+
+
0.3V)
0.3V)
Digital Input Voltage......................–0.3V to (VCC + 0.3V)
Digital Output Voltage....................–0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2488C................................................. 0°C to 70°C
LTC2488I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
FO
SDI
SCK
CS
SDO
GND
COM
1
2
3
4
5
6
7
14 REF
13 REF+
12 VCC
15 11 CH3
10 CH2
9 CH1
8 CH0
DE PACKAGE
14-LEAD (4mm x 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 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 LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are 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/
E LECTRICAL CHARACTERISTICS The l 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)
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
Output Noise
0.1V ≤ VREF ≤ VCC, –FS ≤ VIN ≤ +FS (Note 5)
16
Bits
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)
l
2 20 ppm of VREF
1 ppm of VREF
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC (Note 14)
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC
l
0.5 5
10
µV
nV/°C
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF, IN= 0.25VREF
l
32 ppm of VREF
2.5V ≤ VREF ≤ VCC, IN+ = 0.75VREF, IN= 0.25VREF
0.1 ppm of VREF/°C
2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
l
32 ppm of VREF
2.5V ≤ VREF ≤ VCC, IN+ = 0.25VREF, IN= 0.75VREF
0.1 ppm of VREF/°C
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
15 ppm of VREF
15 ppm of VREF
15 ppm of VREF
2.7V
GND
<
VINC+C
<
=
5.5V,
IN
V2C.5CV(N≤oVteRE1F3≤)
VCC,
0.6 µVRMS
2488fb
2 For more information www.linear.com/LTC2488


Features FEATURES n Up to 2 Differential or 4 Si ngle-Ended Inputs n Easy Drive Technol ogy Enables Rail-to-Rail Inputs with Ze ro Differential Input Current n Direct ly Digitizes High Impedance Sensors wit h Full Accuracy n 600nV RMS Noise (0.0 2LSB Transition Noise) n GND to VCC In put/Reference Common Mode Range n Simu ltaneous 50Hz/60Hz Rejection n 2ppm INL , No Missing Codes n 1ppm Offset and 15 ppm Full-Scale Error n No Latency: Dig ital 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 4 mm × 3mm DFN Package APPLICATIONS n D irect Sensor Digitizer n Direct Temper ature Measurement n Instrumentation n Industrial Process Control LTC2488 16 -Bit 2-/4-Channel ΔS ADC with Easy Dri ve Input Current Cancellation DESCRIPTI ON The LTC®2488 is a 4-channel (2-chan nel differential), 16‑bit, No Latency DS™ ADC with Easy Drive™ technolog y. The patented sampling scheme eliminates dynamic input current errors .
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