Analog Devices LTC2345 | Demoboard DC2326A-B

Description

Demonstration circuit 2326A shows the proper way to drive the LTC®2345 ADC. The LTC2345 is a low noise, high speed,simultaneous sampling 16-/18-bit successive approximation register (SAR) ADC. The LTC2345 has a flexible SoftSpan™ interface that allows conversion-by-conversion control of the input voltage span on a per-channel basis. An internal 2.048V reference and 2× buffer simplify basic operationwhile an external reference can be used to increase theinput range and the SNR of the ADC.The DC2326A demonstrates the DC and AC performance of the LTC2345 in conjunction with the DC590/DC2026 and DC890 data collection boards. Use the DC590/DC2026 todemonstrate DC performance such as peak-to-peak noise and DC linearity. Use the DC890 if precise sampling ratesare required or to demonstrate AC performance such as SNR, THD, SINAD and SFDR. The DC2326A is intended to demonstrate recommended grounding, component placement and selection, routing and bypassing for this ADC. A suggested driver circuit for the analog inputs is also presented.

Features

• 200ksps per Channel Throughput
• Eight Simultaneous Sampling Channels
• ±1.25LSB INL (Maximum)
• Guaranteed 16-Bit, No Missing Codes
• Differential, Wide Common Mode Range Inputs
• Per-Channel SoftSpan Input Ranges:
• ±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V
• ±5V, 0V to 5V, ±2.5V, 0V to 2.5V
• 91dB Single-Conversion SNR (Typical)
• −113dB THD (Typical) at fIN = 2kHz
• 102dB CMRR (Typical) at fIN = 200Hz
• Rail-to-Rail Input Overdrive Tolerance
• Guaranteed Operation to 125°C
• Integrated Reference and Buffer (4.096V)
• SPI CMOS (1.8V to 5V) and LVDS Serial I/O
• Internal Conversion Clock, No Cycle Latency
• 81mW Power Dissipation (Typical)
• 48-Lead (7mm x 7mm) QFN Package

Typical applications

• Programmable Logic Controllers, Industrial Process Control, High Speed Data Acquisition.
• Medical Imaging

More information

• Datasheet
• IC product information