June 10, 2015 – Linear Technology Korea (CEO Hong Sa-kwak) announced the launch of the LTC2348-18, an 18-bit 8-channel simultaneous sampling SAR (successive approximation register) ADC that delivers industry-leading performance and flexibility. The device converts 8 channels at 200ksps per channel, with each SoftSpan™ input independently configurable on a conversion-by-conversion basis to accommodate ±10.24V, 0V ~ 10.24V, ±5.12V, or 0V ~ 5.12V signals. The differential analog inputs operate over a wide 34V input common-mode range, enabling the ADC to directly digitize a variety of signals that simplify signal chain design. Input signal flexibility is exceptional with maximum INL of ±3LSB and guaranteed no missing codes at 18-bit resolution, while delivering a 96.7dB SNR characteristic. These advantages make the LTC2348-18 ideal for high-performance industrial process control, test and measurement, power line monitoring, instrumentation, and automated test equipment applications.

The LTC2348-18 features a precision internal reference with a maximum temperature coefficient of 20ppm/°C and an integrated reference buffer for accurate single-measurement capability, saving board space in high-density circuit designs. An external 5V reference option is available to extend the analog input range to ±12.5V. The device consumes 140mW when simultaneously converting 8 channels at 200ksps per channel and offers nap and power-down modes to reduce power consumption at slower throughput rates.

Beyond its distinctive analog features, the LTC2348-18 provides excellent digital flexibility with pin-selectable SPI CMOS and LVDS serial interfaces. With a wide digital output supply range, the device can communicate with CMOS logic between 1.8V and 5V. In CMOS mode, applications can choose between 1 and 8 lanes of serial output data, allowing users to optimize bus width and data throughput. LVDS mode provides low-noise, high-speed communication over longer distances using differential signaling. Combined with these I/O interface options, the LTC2348-18 can communicate equally well with legacy microcontrollers and modern FPGAs.

The LTC2348-18 is the first product in a family of multi-channel 18/16-bit simultaneous sampling SAR ADCs. All specifications are guaranteed over the extended temperature range of –40°C ~ 125°C. The LTC2348-18 is available in a 48-pin 7mm x 7mm LQFP package at $23.35 per unit in quantities of 1,000. Samples and demo boards can be requested at www.linear.com/product/LTC2348-18 or by contacting Linear Technology's regional office.

18-Bit Simultaneous Sampling Octal ADC with SoftSpan Inputs

Product Features: LTC2348-18

-200ksps per channel throughput

-8 simultaneous sampling channels

-Maximum ±3LSB INL

-18-bit guaranteed, no missing codes

-Differential inputs with wide common-mode range

-SoftSpan input range per channel: ±10.24V, 0V ~ 10.24V, ±5.12V, 0V ~ 5.12V

-96.7dB single conversion SNR (Typical)

-Integrated reference and buffer (4.096V)

-2.5V ~ 5V external reference input range

-SPI CMOS (1.8V to 5V) and LVDS Serial I/O

-140mW power consumption (Typical)

-48-pin (7mm x 7mm) LQFP package