Linear Technology offers an 18-bit, true-bipolar, pseudo-differential input ADC
The LTC2328-18 is a low noise, high-speed 18-bit successive approximation register (SAR) ADC with pseudo-differential inputs. Operating from a single 5 V supply, the LTC2328-18 has a ±10.24 V true-bipolar input range, making it ideal for high-voltage applications which require a wide dynamic range. The LTC2328-18 achieves ±5 LSB INL maximum, no missing codes at 18 bits with 95 dB SNR.
The LTC2328-18 has an onboard single-shot-capable reference buffer and low drift (20 ppm/°C max) 2.048 V temperature-compensated reference. The LTC2328-18 also has a high-speed SPI-compatible serial interface that supports 1.8 V, 2.5 V, 3.3 V and 5 V logic while also featuring a daisy-chain mode. The fast 1Msps throughput with no cycle latency makes the LTC2328-18 ideally suited for a wide variety of high-speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2328-18 dissipates only 50 mW and automatically naps between conversions, leading to reduced power dissipation that scales with the sampling rate. A sleep mode is also provided to reduce the power consumption of the LTC2328-18 to 300 μW for further power savings during inactive periods.