Datasheet LTC2439-1 (Analog Devices)

LTC2439-1 8-/16-Channel 16-Bit No Latency ∆Σ™ ADC
FEATURES DESCRIPTION
n
16-Channel Single-Ended or 8-Channel Differential
The LTC®2439-1 is a 16-channel (8-differential) micropower
Inputs
16-bit ∆Σ analog-to-digital converter. It operates from 2.7V n
Low Supply Current (200µA, 4µA in Autosleep)
to 5.5V and includes an integrated oscillator, 0.12LSB n
Rail-to-Rail Differential Input/Reference
INL and 1µV RMS noise. It uses delta-sigma technology n
16-Bit No Missing Codes
and provides single cycle settling time for multiplexed n
1µV RMS Noise, 16-ENOBS Independent of VREF
applications. Through a single pin, the LTC2439-1 can be n
Very Low Transition Noise: Less Than 0.02LSB
configured for better than 87dB differential mode rejection n
Operates with a Reference as Low as 100mV with
at 50Hz and 60Hz ±2%, or it can be driven by an external
1.5µV LSB Step Size
oscillator for a user-defined rejection frequency. The n
Guaranteed Modulator Stability and Lock-Up
internal oscillator requires no external frequency setting
Immunity for Any Input and Reference Conditions
components. n Single Supply 2.7V to 5.5V Operation The LTC2439-1 accepts any external differential reference n Internal Oscillator—No External Components voltage from 0.1V to VCC for flexible ratiometric and remote Required sensing measurement applications. It can be configured n 87dB Min, 50Hz and 60Hz Simultaneous Notch Filter to take 8 differential channels or 16 single-ended chan- n Pin Compatible with the 24-Bit LTC2418 nels. The full-scale bipolar input range is from –0.5VREF n 28-Lead SSOP Packag to 0.5VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be in-
APPLICATIONS
dependently set between GND and VCC. The DC common n Direct Sensor Digitizer mode input rejection is better than 140dB. n Weight Scales The LTC2439-1 communicates through a flexible n Direct Temperature Measurement 4-wire digital interface that is compatible with SPI and n Gas Analyzers MICROWIRE protocols. n Strain Gauge Transducers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No n Instrumentation Latency ∆Σ is a trademark of Linear Technology Corporation. All other trademarks are the n Data Acquisition property of their respective owners. n Industrial Process Control
TYPICAL APPLICATION Minimum Resolvable Signal vs V
2.7V TO 5.5V
REF
90 11 9 1µF 80 REF+ V 21 CH0 CC 19 70 22 CH1 FO = EXTERNAL OSCILLATOR • = 50Hz and 60Hz REJECTION 60 • • 20 50 28 CH7 SDI 16-CHANNEL 18 1 CH8 MUX + DIFFERENTIAL SCK 40 THERMOCOUPLE 17 4-WIRE • 16-BIT ∆Σ ADC • – SDO SPI INTERFACE 16 • 30 CS 8 CH15 20 10 COM MINIMUM RESOLVABLE SIGNAL (µV) 10 12 REF– 0 15 0 1 2 3 4 5 GND LTC2439-1 VREF (V) 24361 TA02 *FOR V 241418 TA01a REF = 0.4V RESOLUTION IS LIMITED BY STEP SIZE 24391fb For more information www.linear.com/LTC2439-1 1 Document Outline Features Applications Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Converter Characteristics Analog Input and Reference Digital Inputs and Digital Outputs POWER REQUIREMENTS Timing Characteristics Pin Functions FUNCTIONAL Block Diagram Test CircuitS Applications Information Package Description Revision History Typical Application Related Parts