Features

• 200ksps per Channel Throughput
• Eight Simultaneous Sampling Channels
• ±3LSB INL (Maximum, ±10.24V Range)
• Guaranteed 18-Bit, No Missing Codes
• Differential, Wide Common Mode Range Inputs
• Per-Channel SoftSpan Input Ranges:
  ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V
  ±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V
• 96.7dB Single-Conversion SNR (Typical)
• −109dB THD (Typical) at f_IN = 2kHz
• 118dB CMRR (Typical) at f_IN = 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
• 140mW Power Dissipation (Typical)
• 48-Lead (7mm x 7mm) LQFP Package

Typical Application

Description

The LTC®2348-18 is an 18-bit, low noise 8-channel simultaneous sampling successive approximation register (SAR) ADC with differential, wide common mode range inputs. Operating from a 5V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, each channel of this SoftSpan^TM ADC can be independently configured on a conversion-by-conversion basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V signals. Individual channels may also be disabled to increase throughput on the remaining channels.

The wide input common mode range and 118dB CMRR of the LTC2348-18 analog inputs allow the ADC to directly digitize a variety of signals, simplifying signal chain design. This input signal flexibility, combined with ±3LSB INL, no missing codes at 18 bits, and 96.7dB SNR, makes the LTC2348-18 an ideal choice for many high voltage applications requiring wide dynamic range.

The LTC2348-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces. Between one and eight lanes of data output may be employed in CMOS mode, allowing the user to optimize bus width and throughput.