AD4630-20

The AD4630-20/AD4632-20 are 2-channel, simultaneous sampling, Easy Drive™, 2MSPS or 500kSPS successive approximation register (SAR) analog-to-digital converters (ADCs). With a guaranteed typical ±0.8ppm INL and no missing codes at 20 bits, the AD4630-20/AD4632-20 achieve unparalleled precision from −40°C to +125°C. Figure 1 shows the functional architecture of the AD4630-20/AD4632-20.A low drift, internal precision reference buffer eases voltage reference sharing with other system circuitry. The AD4630-20/ AD4632-20 offer a typical dynamic range of 106dB when using a 5V reference. The low noise floor enables signal chains, which require less gain and lower power. A block averaging filter with programmable decimation ratio can increase dynamic range up to 153dB. The wide differential input and common-mode ranges allow inputs to use the full voltage reference (±VREF) range without saturating, simplifying signal conditioning requirements and system calibration. The improved settling of the Easy Drive analog inputs broadens the selection of analog front end (AFE) components compatible with the AD4630-20/AD4632-20. Both single-ended and differential signals are supported.The versatile Flexi-SPI serial-peripheral interface (SPI) eases host processor and ADC integration. A wide data clocking window, multiple SDO lanes, and optional dual data rate (DDR) data clocking can reduce the serial clock to 10MHz while operating at a sample rate of 2MSPS or 500kSPS. Echo clock and ADC host clock modes relax the timing requirements and simplify the use of digital isolators.The 64-ball chip-scale package ball grid array (CSP_BGA) of the AD4630-20/AD4632-20 integrates all critical power supply and reference bypass capacitors, which reduce the footprint and system component count, and lessening sensitivity to board layout.