Datasheet LTC2415, LTC2415-1 (Analog Devices)

LTC2415/LTC2415-1 24-Bit No Latency ∆Σ™ ADCs with Differential Input and Differential Reference
FEATURES DESCRIPTION
n
2
×
Speed Up Version of the LTC2410/LTC2413:
The LTC®2415/2415-1 are micropower 24-bit differential
15Hz Output Rate, 50Hz or 60Hz Notch—LTC2415;
∆Σ analog to digital converters with integrated oscillator,
13.75Hz Output Rate, Simultaneous 50Hz/60Hz
2ppm INL, 0.23ppm RMS noise and a 2.7V to 5.5V supply
Notch—LTC2415-1
range. They use delta-sigma technology and provide single n
Differential Input and Differential Reference with
cycle settling time for multiplexed applications. Through a
GND to VCC Common Mode Range
single pin, the LTC2415 can be configured for better than n
2ppm INL, No Missing Codes
110dB input differential mode rejection at 50Hz or 60Hz n
2.5ppm Gain Error
±2%, or it can be driven by an external oscillator for a n
0.23ppm Noise
user defined rejection frequency. The LTC2415-1 can be n
Single Conversion Settling Time for Multiplexed
configured for better than 87dB input differential mode
Applications
rejection over the range of 49Hz to 61.2Hz (50Hz and 60Hz n Internal Oscillator—No External Components ±2% simultaneously). The internal oscillator requires no Required external frequency setting components. n 24-Bit ADC in Narrow SSOP-16 Package The converters accept any external differential reference (SO-8 Footprint) voltage from 0.1V to VCC for flexible ratiometric and re- n Single Supply 2.7V to 5.5V Operation mote sensing measurement configurations. The full-scale n Low Supply Current (200µA) and Auto Shutdown differential input range is from –0.5VREF to 0.5VREF. The reference common mode voltage, VREFCM, and the input
APPLICATIONS
common mode voltage, VINCM, may be independently set n anywhere within the GND to V Direct Sensor Digitizer CC range of the LTC2415/ n LTC2415-1. The DC common mode input rejection is Weight Scales n better than 140dB. Direct Temperature Measurement n Gas Analyzers The LTC2415/LTC2415-1 communicate through a flexible n Strain Gage Transducers 3-wire digital interface which is compatible with SPI and n Instrumentation MICROWIRE protocols. n Data Acquisition L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load and No Latency ∆Σ are trademarks of Linear Technology Corporation. All other trademarks are n Industrial Process Control the property of their respective owners. n 6-Digit DVMs
TYPICAL APPLICATION
VCC 2.7V TO 5.5V 1µF 1µF VCC= INTERNAL OSC/50Hz REJECTION (LTC2415) 2 14 V = EXTERNAL CLOCK SOURCE CC FO = INTERNAL OSC/60Hz REJECTION (LTC2415) 3 2 LTC2415/ = INTERNAL 50Hz/60Hz REJECTION (LTC2415-1) REF+ V LTC2415-1 CC 12 SDO BRIDGE 3 5 REFERENCE REF+ 13 IMPEDANCE IN+ LTC2415/ 13 SCK 3-WIRE SCK VOLTAGE 100Ω TO 10k 6 4 IN– LTC2415-1 SPI INTERFACE 0.1V TO V REF– CC 11 CS 3-WIRE 4 REF– 5 12 GND F ANALOG INPUT RANGE O IN+ SDO SPI INTERFACE –0.5VREF TO 0.5VREF 6 1, 7, 8 14 IN– 11 CS 9, 10, 1, 7, 8, 9, 10, 15, 16 15, 16 GND 2415 TA02 2415 TA01 2415fa For more information www.linear.com/LTC2415 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Converter Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Analog Input and Reference The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Electrical Characteristics Digital Inputs and Digital Outputs The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3) Power Requirements The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) Analog Input and Reference The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Timing Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Applications Information Typical Applications PCB Layout and Film Package Description Revision History Typical Application Related Parts