AD7626 PulSAR Differential ADC

ADI's AD7626 is a 16-bit, 10 MSPS, charge redistribution successive approximation register (SAR) based architecture analog-to-digital converter (ADC). SAR architecture allows unmatched performance both in noise (91.5 dB SNR) and in linearity (±0.45 LSB INL). The AD7626 contains a high speed, 16-bit sampling ADC, an internal conversion clock, and an internal buffered reference. On the CNV edge, it samples the voltage difference between the IN+ and IN- pins. The voltages on these pins swing in opposite phase between 0 V and REF. The 4.096 V reference voltage, REF, can be generated internally or applied externally. The AD7626 is housed in a 32-lead, 5 mm x 5 mm LFCSP with operation specified from -40°C to +85°C.

ADI's AD7626 PulSAR ADC achieves a new level of 16-bit data capture performance with 15-bit ENOB (effective number of bits) and 10 MSPS (million samples per second) throughput, which is 2.5 times faster than other SAR ADCs. Unlike other ADCs, which operate at much lower speeds or reach higher sample rates by increasing power consumption and trading off ac and dc performance, the AD7626 PulSAR ADC has a 92 dB SNR (signal-to-noise ratio) that is 8 dB (1.3 bits) better than many ADCs, regardless of architecture.

For applications that don't require full 10 MSPS data rates, the AD7626 can be easily multiplexed. Some medical imaging devices, for example, could use the AD7626 in a two-channel configuration where each channel operates at 5 MSPS. This would allow the system designer to lower materials costs by reducing data converter component count by 50%, while still maintaining speeds that are 25% faster than many existing solutions.