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LTC2414 Datasheet, PDF (1/48 Pages) Linear Technology – 8-/16-Channel 24-Bit No Latency TM ADCs | |||
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LTC2414/LTC2418
8-/16-Channel
24-Bit No Latency âΣTM ADCs
FEATURES
â 8-/16-Channel Single-Ended or 4-/8-Channel
Differential Inputs (LTC2414/LTC2418)
â Low Supply Current (200µA, 4µA in Autosleep)
â Differential Input and Differential Reference
with GND to VCC Common Mode Range
â 2ppm INL, No Missing Codes
â 2.5ppm Full-Scale Error and 0.5ppm Offset
â 0.2ppm Noise
â No Latency: Digital Filter Settles in a Single Cycle
Each Conversion Is Accurate, Even After a New
Channel is Selected
â Single Supply 2.7V to 5.5V Operation
â Internal OscillatorâNo External Components
Required
â 110dB Min, 50Hz/60Hz Notch Filter
U
APPLICATIO S
â Direct Sensor Digitizer
â Weight Scales
â Direct Temperature Measurement
â Gas Analyzers
â Strain Gauge Transducers
â Instrumentation
â Data Acquisition
â Industrial Process Control
DESCRIPTIO
The LTC®2414/LTC2418 are 8-/16-channel (4-/8-differ-
ential) micropower 24-bit âΣ analog-to-digital convert-
ers. They operate from 2.7V to 5.5V and include an
integrated oscillator, 2ppm INL and 0.2ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2414/LTC2418 can be configured for
better than 110dB differential mode rejection at 50Hz or
60Hz ±2%, or they can be driven by an external oscillator
for a user-defined rejection frequency. The internal oscil-
lator requires no external frequency setting components.
The LTC2414/LTC2418 accept any external differential
reference voltage from 0.1V to VCC for flexible ratiometric
and remote sensing measurement applications. They can
be configured to take 4/8 differential channels or
8/16 single-ended channels. The full-scale bipolar input
range is from â 0.5VREF to 0.5VREF. The reference common
mode voltage, VREFCM, and the input common mode volt-
age, VINCM, may be independently set within GND to VCC.
The DC common mode input rejection is better than 140dB.
The LTC2414/LTC2418 communicate through a flexible
4-wire digital interface that is compatible with SPI and
MICROWIRETM protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency âΣ is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATIO
2.7V TO 5.5V
THERMOCOUPLE
21 CH0
22 CH1
â¢
â¢
â¢
28 CH7
1 CH8
â¢
â¢
â¢
8 CH15
10 COM
16-CHANNEL
MUX
11 9
REF+ VCC
+ DIFFERENTIAL
â 24-BIT âΣ ADC
1µF
19
FO
VCC
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
SDI 20
18
SCK
SDO 17
16
CS
4-WIRE
SPI INTERFACE
12 REF â
15 GND
LTC2418
241418 TA01a
Total Unadjusted Error
vs Input Voltage
3
VCC = 5V
VREF = 5V
2 VINCM = VREFCM = 2.5V
FO = GND
1
TA = 25°C
0
TA = â45°C
â1
TA = 85°C
â2
â3
â2.5 â2 â1.5 â1 â0.5 0 0.5 1.0 1.5 2.0 2.5
INPUT VOLTAGE (V)
2414/18 TA01b
241418fa
1
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