Analogue, Mixed Signal, LSI


18-bit SAR ADC

16 May 2012 Analogue, Mixed Signal, LSI

New from Linear Technology is the LTC2389-18, a fast 18-bit, no cycle latency SAR ADC (successive approximation register analog-to-digital converter).

The LTC2389-18 achieves 99,8 dB SNR and -116 dB THD at sample rates up to 2,5 MSps. Operating from a single 5 V supply, it supports three pin-configurable analog input ranges, easily interfacing to multiple signal chains with a single device.

For the highest SNR performance, the IC can be configured for fully differential (±4,096 V) inputs. The pseudo-differential unipolar (0 V to 4,096 V) and bipolar (±2,048 V) analog input ranges enable lower-power single-ended drive and benefit from the reduction of unwanted signals common to both inputs. The LTC2389-18 is well suited for demanding designs that require maximum signal swings at low power levels in noisy industrial environments.

The device features ±3 LSB INL (max), ±10 LSB offset error and 18 bits, no missing codes resolution. It also has a 4,096 V precision internal reference with a 20 ppm/°C temperature coefficient, providing space savings for high-density designs. The IC dissipates 162,5 mW at 2,5 MSps and features a shutdown mode that reduces power dissipation to 75 μW when not converting.

The true no-latency operation enables accurate one shot measurements even after lengthy idle periods with no minimum sample rate requirement. The LTC2389-18 provides a flexible digital interface supporting 2,5 MSps throughput with parallel interface and 1,9 MSps throughput with serial SPI interface at I/O voltages from 1,8 V to 5 V.



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