AD4022

Data Sheet 20-Bit, 1.8 MSPS/1 MSPS/500 kSPS, Easy Drive, Differential SAR ADCs AD4020/AD4021/AD4022 FEATURES Easy Drive Greatly reduced input kickback Input current reduced to 0.5 μA/MSPS Enhanced acquisition phase, ≥77% of cycle time at 1 MSPS First conversion accurate, no latency or pipeline delay Input span compression for single-supply operation Fast conversion allows low SPI clock rates Input overvoltage clamp protection sinks up to 50 mA SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface High performance Differential analog input range: ±VREF, VREF from 2.4 V to 5.1 V Throughput: 1.8 MSPS/1 MSPS/500 kSPS options INL: ±3.1 ppm maximum Guaranteed 20-bit, no missing codes SNR: 100.5 dB at fIN = 1 kHz, VREF = 5 V THD: −123 dB at fIN = 1 kHz, −100 dB at fIN = 100 kHz SINAD: 89 dB at fIN = 900 kHz (see Figure 17) Oversampled dynamic range 104 dB for OSR = 2 131 dB for OSR = 1024 Low power Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface 2.7 mW at 500 kSPS (VDD only) 83 µW at 10 kSPS, 15 mW at 1.8 MSPS (total power) 10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP Pin compatible with AD4003/AD4007/AD4011 family Guaranteed operation: −40°C to +125°C APPLICATIONS Automated test equipment Machine automation Medical equipment Battery-powered equipment Precision data acquisition systems Instrumentation and control systems FUNCTIONAL BLOCK DIAGRAM 2.5V TO 5V 1.8V VREF VREF/2 0 VREF VREF/2 0 10µF REF VDD AD4020/AD4021/AD4022 HIGH-Z MODE IN+ 20-BI...