Consumer Electronics

ADC with Wide Input Common Mode Range Simplifies Analog Front-End Circuitry

01 June 2016

Linear Technology Corporation has introduced the LTC2311-16, a 16-bit, 5 Msps successive approximation register (SAR) analog-to-digital converter (ADC) with a wide rail-to-rail input common mode range. The LTC2311-16 features a flexible differential input that accepts analog signals up to the Nyquist frequency. This provides direct conversion of various signal types while maintaining a good signal-to-noise ratio (SNR) of 81.6 dB with a 2.2 MHz input signal, and achieving a high common-mode rejection ratio of 85 dB for the same high-speed input signal.

LTC2311-16 analog-to-digital converter. Source: Linear Technology LTC2311-16 analog-to-digital converter. Source: Linear Technology Instrumentation and medical applications that require channel-to-channel isolation often use single-channel ADCs to individually isolate front-end circuitry. Each of the ADC channels then requires its own signal conditioning circuitry along with an isolated power source. This circuit is replicated on all channels, so any simplification in the circuit has a profound effect on the complexity of the system. The flexible differential inputs and wide input common mode range of the LTC2311-16 simplify the input signal conditioning design, significantly lowering the required component count, reducing system cost, power consumption and circuit board space.

The LTC2311-16 leads a pin-compatible family of 16-, 14- and 12-bit SAR ADCs with sample rates of 5 Msps and 2 Msps. These devices integrate a precision internal reference with low drift, guaranteeing 20 ppm/°C maximum temperature coefficient to simplify system design. This family can be powered from either a 3.3 V or 5 V supply, and consumes 30 mW with a 3.3 V supply and 50 mW at 5 V. The high-speed SPI-compatible CMOS or LVDS serial interface is suited for highly integrated high-speed systems.

The LTC2311-16 is available today in commercial, industrial and automotive (-40° C to 125° C) temperature grades. Pricing begins at $9.95 each in 1,000-piece quantities.

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