LTC2372-18 - 18-Bit, 500ksps, 8-Channel SAR ADC with 100dB SNR

The LTC®2372-18 is a low noise, high speed, 8-channel 18-bit successive approximation register (SAR) ADC. Operating from a single 5V supply, the LTC2372-18 has a highly configurable, low crosstalk 8-channel input multiplexer, supporting fully differential, pseudo-differential unipolar and pseudo-differential bipolar analog input ranges. The LTC2372-18 achieves ±2.75LSB INL (maximum) in all input ranges, no missing codes at 18-bits and 100dB (fully differential)/ 95dB (pseudo-differential) SNR (typical).

The LTC2372-18 has an onboard low drift (20ppm/°C max) 2.048V temperature-compensated reference and a singleshot capable reference buffer. The LTC2372-18 also has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic through which a sequencer with a depth of 16 may be programmed. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2372-18 dissipates only 27mW and automatically naps between conversions, leading to reduced power dissipation that scales with the sampling rate. A sleep mode is also provided to reduce the power consumption of the LTC2372-18 to 300μW for further power savings during inactive periods.

Features

500ksps Throughput Rate
18-Bit Resolution with No Missing Codes
8-Channel Multiplexer with Selectable Input Range
Fully Differential (±4.096V)
Pseudo-Differential Unipolar (0V to 4.096V)
Pseudo-Differential Bipolar (±2.048V)
INL: ±2.75LSB (Maximum)
SNR: 100dB (Fully Differential)/95dB (Pseudo-
Differential) (Typical) at fIN = 1kHz
THD: –110dB (Typical) at fIN = 1kHz
Programmable Sequencer
Selectable Digital Gain Compression
Single 5V Supply with 1.8V to 5V I/O Voltages
SPI-Compatible Serial I/O
Onboard 2.048V Reference and Reference Buffer
No Pipeline Delay, No Cycle Latency
Power Dissipation 27mW (Typical)
Guaranteed Operation to 125°C
32-Lead 5mm × 5mm QFN Package

Typical Application

Applications

Programmable Logic Controllers
Industrial Process Control
High Speed Data Acquisition
Portable or Compact Instrumentation
ATE

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC2372CUH-18#PBF	5x5 QFN-32	C	$18.50	$12.95
LTC2372CUH-18#TRPBF	5x5 QFN-32	C	$18.56	$13.01
LTC2372HUH-18#PBF	5x5 QFN-32	H	$24.47	$17.13
LTC2372HUH-18#TRPBF	5x5 QFN-32	H	$24.53	$17.19
LTC2372IUH-18#PBF	5x5 QFN-32	I	$21.28	$14.89
LTC2372IUH-18#TRPBF	5x5 QFN-32	I	$21.34	$14.95

Demo Boards


Part Number	Description	Price
DC2071A-B	LTC2372-18 Demo Board \| 18-Bit, 500ksps, 8-Channel SAR ADC with 100dB SNR (req DC590, DC2026 or DC890	$150.00

**Companion Boards**
Part Number	Description	Price
DC2026C	Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform	$75.00
DC590B	Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards	$50.00
DC890B	USB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS)	$300.00