Datasheet LTC2335-18 (Analog Devices)

LTC2335-18 18-Bit, 1Msps 8-Channel Differential ±10.24V Input SoftSpan ADC with Wide Input Common Mode Range
FeaTures DescripTion
n
1Msps Throughput
The LTC®2335-18 is an 18-bit, low noise 8-channel multi- n
±3LSB INL (Maximum, ±10.24V Range)
plexed successive approximation register (SAR) ADC with n
Guaranteed 18-Bit, No Missing Codes
differential, wide common mode range inputs. Operating n
Differential, Wide Common Mode Range Inputs
from a 5V low voltage supply, flexible high voltage supplies, n
8-Channel Multiplexer with SoftSpan Input Ranges:
and using the internal reference and buffer, this SoftSpanTM
±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V
ADC can be configured on a conversion-by-conversion
±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V
basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to n
96.7dB Single-Conversion SNR (Typical)
5.12V signals on any channel. Alternately, the ADC may n be programmed to cycle through a sequence of channels
−109dB THD (Typical) at fIN = 2kHz
n and ranges without further user intervention.
118dB CMRR, 125dB Active Crosstalk (Typical)
n
Rail-to-Rail Input Overdrive Tolerance
The wide input common mode range and 118dB CMRR of n Programmable Sequencer with No-Latency Control the LTC2335-18 analog inputs allow the ADC to directly n Guaranteed Operation to 125°C digitize a variety of signals, simplifying signal chain de- n Integrated Reference and Buffer (4.096V) sign. This input signal flexibility, combined with ±3LSB n SPI CMOS (1.8V to 5V) and LVDS Serial I/O INL, no missing codes at 18 bits, and 96.7dB SNR, makes n No Pipeline Delay, No Cycle Latency the LTC2335-18 an ideal choice for many high voltage n 180mW Power Dissipation (Typical) applications requiring wide dynamic range. n 48-Lead (7mm × 7mm) LQFP Package The LTC2335-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces.
applicaTions
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property n Programmable Logic Controllers of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673. Other Patents pending. n Industrial Process Control n Power Line Monitoring n Test and Measurement
Typical applicaTion
15V 5V 1.8V TO 5V
Integral Nonlinearity vs
0.1µF 0.1µF 2.2µF 0.1µF
Output Code and Channel
CMOS OR LVDS 2.0 I/O INTERFACE ±10.24V RANGE FULLY V TRUE BIPOLAR DRIVE (IN– = 0V) CC VDD VDDLBYP OVDD 1.5 ARBITRARY LVDS/CMOS DIFFERENTIAL IN0+ ALL CHANNELS +10V PD +5V IN0– 1.0 LTC2335-18 0V 0V SDO 0.5 –10V –5V SCKO • • • 18-BIT SCKI 0 MUX SAMPLING SDI TRUE BIPOLAR UNIPOLAR ADC CS –0.5 +10V +10V INL ERROR (LSB) BUSY SAMPLE CNV –1.0 CLOCK 0V 0V –1.5 –10V –10V IN7+ IN7– –2.0 DIFFERENTIAL INPUTS IN+/IN– WITH VEE REFBUF REFIN GND –131072 –65536 0 65536 131072 WIDE INPUT COMMON MODE RANGE 233518 TA01a OUTPUT CODE 47µF 0.1µF 0.1µF 233518 TA01b –15V 233518f For more information www.linear.com/LTC2335-18 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Converter Characteristics Dynamic Accuracy Internal Reference Characteristics Reference Buffer Characteristics Digital Inputs and Digital Outputs Power Requirements ADC Timing Characteristics Typical Performance Characteristics Pin Functions Configuration Tables Functional Block Diagram Timing Diagram Applications Information Board Layout Package Description Typical Application Related Parts