Power Electronics
The differential analog inputs operate over a wide 34V input common mode range allowing it to directly digitize a variety of signals to simplify the signalchain design Image courtesy of Linear Technology

The differential analog inputs operate over a wide 34V input common mode range, allowing it to directly digitize a variety of signals to simplify the signal-chain design. (Image courtesy of Linear Technology).

Octal, Simultaneous Sampling ADC Achieves True 18-Bit Performance

Linear Technology Corp. recently introduced the LTC2348-18, an 18-bit, 8-channel simultaneous sampling successive approximation register (SAR) analog-to digital converter (ADC). While converting eight channels at 200ksps per channel throughput, each input 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.

The LTC2348-18's differential analog inputs operate over a wide 34V input common mode range, allowing it to directly digitize a variety of signals to simplify the signal-chain design. The input signal flexibility, combined with ±3LSB maximum INL, no missing codes at 18 bits, and 96.7dB SNR, makes the LTC2348-18 suitable for industrial process control, test and measurement, power line monitoring, instrumentation and automatic test equipment applications.

The LTC2348-18 features a precision internal reference with 20ppm/°C maximum temperature coefficient and an integrated reference buffer capable of accurate one-shot measurements, providing space savings in densely packed circuit boards. Optionally, an external 5V reference can be used to expand the analog input range to ±12.5V. The device dissipates 140mW when converting eight channels simultaneously at 200ksps per channel, and features nap and power-down modes to reduce power dissipation at slower throughputs.

In addition to its analog characteristics, the LTC2348-18 offers digital flexibility, featuring pin-selectable SPI CMOS and LVDS serial interfaces. The wide digital output supply range allows the device to communicate with any CMOS logic between 1.8V and 5V. In CMOS mode, applications can employ between one and eight lanes of serial output data, enabling the user to optimize bus width and data throughput. LVDS mode offers low noise, high speed communications over greater distances using differential signaling. Together, these I/O interface options allow the LTC2348-18 to communicate equally well with legacy microcontrollers and modern FPGAs.

The LTC2348-18 is the first in a family of multichannel 18-/16-bit simultaneous sampling SAR ADCs. All specifications are guaranteed over the extended -40°C to 125°C temperature range. The LTC2348-18 is available now in a 48-lead, 7mm x 7mm LQFP package, priced starting at $23.35 each in 1,000-piece quantities. 

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