Datasheet LTC2414, LTC2418 (Analog Devices)

LTC2414/LTC2418 8-/16-Channel 24-Bit No Latency ∆Σ™ ADCs
FeaTures DescripTion
n
8-/16-Channel Single-Ended or 4-/8-Channel
The LTC®2414/LTC2418 are 8-/16-channel (4-/8-differen-
Differential Inputs (LTC2414/LTC2418)
tial) micropower 24-bit ∆∑ analog-to-digital converters. n
Low Supply Current (200µA, 4µA in Autosleep)
They operate from 2.7V to 5.5V and include an integrated n
Differential Input and Differential Reference with
oscillator, 2ppm INL and 0.2ppm RMS noise. They use
GND to VCC Common Mode Range
delta-sigma technology and provide single cycle settling n
2ppm INL, No Missing Codes
time for multiplexed applications. Through a single pin, n
2.5ppm Full-Scale Error and 0.5ppm Offset
the LTC2414/LTC2418 can be configured for better than n
0.2ppm Noise
110dB differential mode rejection at 50Hz or 60Hz ±2%, n
No Latency: Digital Filter Settles in a Single Cycle
or they can be driven by an external oscillator for a user-
Each Conversion Is Accurate, Even After a New
defined rejection frequency. The internal oscil ator requires
Channel Is Selected
no external frequency setting components. n Single Supply 2.7V to 5.5V Operation The LTC2414/LTC2418 accept any external differential n Internal Oscillator—No External Components reference voltage from 0.1V to VCC for flexible ratiomet- Required ric and remote sensing measurement applications. They n 110dB Min, 50Hz/60Hz Notch Filter can be configured to take 4/8 differential channels or 8/16 single-ended channels. The full-scale bipolar input
applicaTions
range is from –0.5VREF to 0.5VREF. The reference common n Direct Sensor Digitizer mode voltage, VREFCM, and the input common mode volt- n Weight Scales age, VINCM, may be independently set within GND to VCC. n Direct Temperature Measurement The DC common mode input rejection is better than 140dB. n Gas Analyzers The LTC2414/LTC2418 communicate through a flexible n Strain Gauge Transducers 4-wire digital interface that is compatible with SPI and n Instrumentation MICROWIRE protocols. n Data Acquisition n Industrial Process Control L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency �∑ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion Total Unadjusted Error vs Input Voltage
2.7V TO 5.5V 3 VCC = 5V 11 9 1µF VREF = 5V 2 VINCM = VREFCM = 2.5V REF+ V V 21 CC CC CH0 F 19 = 50Hz REJECTION O = GND 22 CH1 F ) O = EXTERNAL OSCILLATOR 1 • = 60Hz REJECTION REF TA = 25°C • • 20 28 CH7 SDI 16-CHANNEL 0 18 1 CH8 MUX + DIFFERENTIAL SCK THERMOCOUPLE 17 4-WIRE T • A = –45°C 24-BIT ∑ ADC • – SDO SPI INTERFACE 16 –1 T • TUE (ppm OF V A = 85°C CS 8 CH15 10 COM –2 12 REF– –3–2.5 –2 –1.5 –1 –0.5 0 0.5 1.0 1.5 2.0 2.5 15 GND LTC2418 INPUT VOLTAGE (V) 2414/18 TA01b 241418 TA01a 241418fb For more information www.linear.com/LTC2414 1