LTC2495 ADC Datasheet

LTC2495 Datasheet PDF, Equivalent


Part Number

LTC2495

Description

16-Bit 8-/16-Channel ADC

Manufacture

Linear

Total Page 30 Pages
Datasheet
Download LTC2495 Datasheet


LTC2495
LTC2495
Features
16-Bit 8-/16-Channel
DS
ADC
with PGA, Easy Drive
and I2C Interface
Description
n Up to Eight Differential or 16 Single-Ended Inputs
n Easy DriveTM Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current
n Directly Digitizes High Impedance Sensors with
Full Accuracy
n 2-Wire I2C Interface with 27 Addresses Plus One
Global Address for Synchronization
n 600nV RMS Noise
n Programmable Gain from 1 to 256
n Integrated High Accuracy Temperature Sensor
n GND to VCC Input/Reference Common Mode Range
n Programmable 50Hz, 60Hz, or Simultaneous
50Hz/60Hz Rejection Mode
n 2ppm INL, No Missing Codes
n 1ppm Offset and 15ppm Full-Scale Error
n 2x Speed/Reduced Power Mode (15Hz Using Internal
Oscillator and 80µA at 7.5Hz Output)
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 5mm × 7mm QFN Package
Applications
n Direct Sensor Digitizer
n Direct Temperature Measurement
n Instrumentation
n Industrial Process Control
The LTC®2495 is a 16-channel (eight differential), 16-bit,
No Latency DSTM ADC with Easy Drive technology and a
2-wire, I2C interface. The patented sampling scheme elim-
inates 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 LTC2495 includes programmable gain, a high accuracy
temperature sensor, and an integrated oscillator. This device
can be configured to measure an external signal (from com-
binations of 16 analog input channels operating in single-
ended or differential modes) or its internal temperature
sensor. The integrated temperature sensor offers 1/2°C
resolution and 2°C absolute accuracy. The LTC2495 can
be configured to provide a programmable gain from 1 to
256 in 8 steps.
The LTC2495 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
is selected, is valid. Access to the multiplexer output en-
ables 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
No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
Data Acquisition System with Temperature Compensation
2.7V TO 5.5V
CH0
CH1
CH••• 7
CH8
CH••• 15
COM
16-CHANNEL
MUX
TEMPERATURE
SENSOR
MUXOUT/
ADCIN
VCC
IN+ REF+
16-BIT ∆Σ ADC
WITH EASY DRIVE
INREF
SDA
SCL
MUXOUT/
ADCIN
fO
OSC
2495 TA01
0.1µF
10µF
1.7k
2-WIRE
I2C INTERFACE
Built-In High Performance Temperature Sensor
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –30
–5 20 45 70
TEMPERATURE (°C)
95 120
2495 TA02
For more information www.linear.com/LTC2495
2495fe
1

LTC2495
LTC2495
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage (VCC).................................... –0.3V to 6V
Analog Input Voltage
(CH0-CH15, COM)......................–
REF+, REF................................–
0.3V
0.3V
to
to
(VCC
(VCC
+
+
0.3V)
0.3V)
ADCINN, ADCINP, MUXOUTP,
MUXOUTN.................................–0.3V to (VCC + 0.3V)
Digital Input Voltage......................–0.3V to (VCC + 0.3V)
Digital Output Voltage....................–0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2495C................................................. 0°C to 70°C
LTC2495I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
GND 1
SCL 2
SDA 3
GND 4
NC 5
GND 6
COM 7
CH0 8
CH1 9
CH2 10
CH3 11
CH4 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 GND
30 REF
29 REF+
28 VCC
27 MUXOUTN
26 ADCINN
25 ADCINP
24 MUXOUTP
23 CH15
22 CH14
21 CH13
20 CH12
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN #39) IS GND, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2495CUHF#PBF
LTC2495CUHF#TRPBF 2495
38-Lead (5mm × 7mm) Plastic QFN 0°C to 70°C
LTC2495IUHF#PBF
LTC2495IUHF#TRPBF
2495
38-Lead (5mm × 7mm) Plastic QFN –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/
E lectrical Characteristics (Normal Speed) 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
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
l
2 20 ppm of VREF
1 ppm of VREF
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC (Note 13)
l
0.5 5
µV
2.5V ≤ VREF ≤ VCC, GND ≤ IN+ = IN≤ VCC
10 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
2495fe
2 For more information www.linear.com/LTC2495


Features LTC2495 Features 16-Bit 8-/16-Channel DS ADC with PGA, Easy Drive and I2C Interface Description n Up to Eight Differential or 16 Single-Ended Inputs n Easy DriveTM Technology Enables Rail -to-Rail Inputs with Zero Differential Input Current n Directly Digitizes Hig h Impedance Sensors with Full Accuracy n 2-Wire I2C Interface with 27 Address es Plus One Global Address for Synchron ization n 600nV RMS Noise n Programma ble Gain from 1 to 256 n Integrated Hi gh Accuracy Temperature Sensor n GND t o VCC Input/Reference Common Mode Range n Programmable 50Hz, 60Hz, or Simulta neous 50Hz/60Hz Rejection Mode n 2ppm INL, No Missing Codes n 1ppm Offset an d 15ppm Full-Scale Error n 2x Speed/Re duced Power Mode (15Hz Using Internal O scillator and 80µA at 7.5Hz Output) n No Latency: Digital Filter Settles in a Single Cycle, Even After a New Channe l is Selected n Single Supply 2.7V to 5.5V Operation (0.8mW) n Internal Osci llator n Tiny 5mm × 7mm QFN Package Applications n Direct Sens.
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