LTC2439-1 - 8-/16-Channel 16-Bit No Latency Delta Sigma ADC

The LTC2439-1 is a 16-channel (8-differential) micropower 16-bit Delta Sigma analog-to-digital converter. It operates from 2.7V to 5.5V and includes an integrated oscillator, 0.12LSB INL and 1µV RMS noise. It uses deltasigma technology and provides single cycle settling time for multiplexed applications. Through a single pin, the LTC2439-1 can be configured for better than 87dB differential mode rejection at 50Hz and 60Hz ±2%, or it can be driven by an external oscillator for a user-defined rejection frequency. The internal oscillator requires no external frequency setting components.

The LTC2439-1 accepts any external differential reference voltage from 0.1V to VCC for flexible ratiometric and remote sensing measurement applications. It can be configured to take 8 differential channels or 16 single-ended channels. The full-scale bipolar input range is from – 0.5VREF to 0.5VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be independently set between GND and VCC. The DC common mode input rejection is better than 140dB.

The LTC2439-1 communicates through a flexible 4-wire digital interface that is compatible with SPI and MICROWIRE™ protocols.

Features

16-Channel Single-Ended or 8-Channel Differential Inputs
Low Supply Current (200µA, 4µA in Autosleep)
Rail-to-Rail Differential Input/Reference
16-Bit No Missing Codes
1µV RMS Noise, 16-ENOBS Independent of VREF
Very Low Transition Noise: Less Than 0.02LSB
Operates with a Reference as Low as 100mV with 1.5µV LSB Step Size
Guaranteed Modulator Stability and Lock-Up Immunity for Any Input and Reference Conditions
Single Supply 2.7V to 5.5V Operation
Internal Oscillator—No External Components Required
87dB Min, 50Hz and 60Hz Simultaneous Notch Filter
Pin Compatible with the 24-Bit LTC2418
28-Lead SSOP Package

Typical Application

Applications

Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gauge Transducers
Instrumentation
Data Acquisition
Industrial Process Control

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC2439-1CGN#PBF	SSOP-28	C	$5.00	$3.75
LTC2439-1CGN#TRPBF	SSOP-28	C		$3.85
LTC2439-1IGN#PBF	SSOP-28	I	$5.45	$4.10
LTC2439-1IGN#TRPBF	SSOP-28	I		$4.20

Demo Boards

Part Number	Description	Price
DC790A	LTC2439CGN-1 \| 8-Channel Differential 16-Bit ADC (req DC590)	$50.00
DC907A-B	LTC6102, LT6100, LT1787, LTC2054, and LTC2439-1 (Requires DC590B) \| Demo Board	$150.00

Companion Boards

Part Number	Description	Price
DC590B	Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards	$50.00