Analog Devices AD4021
The AD4020/AD4021/AD4022 are high accuracy, high speed, low power, 20-bit, Easy Drive, precision successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a single power supply, VDD. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage. The AD4020/AD4021/AD4022 power scales linearly with throughput.
| Part No. |
AD4021 |
| Datasheet |
AD4021
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| Manufacturer |
 Analog Devices |
| Description |
Differential SAR ADC |
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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...
