Analog Devices AD4020 | Demoboard EVAL-AD4020FMCZ

Description

The AD4020 is a low noise, low power, high speed, 20-bit, 1.8 MSPS precision successive approximation register (SAR) analog-to-digital converter (ADC). It incorporates ease of use features that lower the signal chain power, reduce signal chain complexity, and enable higher channel density. The high-Z mode, coupled with a long acquisition phase, eliminates the need for a dedicated high power, high speed ADC driver, thus broadening the range of low power precision amplifiers that can drive this ADC directly, while still achieving optimum performance. The input span compression feature enables the ADC driver amplifier and the ADC to operate off common supply rails without the need for a negative supply while preserving the full ADC code range. The low serial peripheral interface (SPI) clock rate requirement reduces the digital input/output power consumption, broadens processor options, and simplifies the task of sending data across digital isolation.

Features

• Throughput: 1.8 MSPS maximum
• INL: ±3.1 ppm maximum
• Guaranteed 20-bit no missing codes
• Low power 9.0 mW at 1.8 MSPS (VDD only) 83 µW at 10 kSPS, 15 mW at 1.8 MSPS (total)
• SNR: 100.5 dB typical at 1 kHz, 99 dB typical at 100 kHz
• THD: −123 dB typical at 1 kHz, −100 dB typical at 100 kHz
• Ease of use features reduce system power and complexity Input overvoltage clamp circuit Reduced nonlinear input charge kickback High-Z mode Long acquisition phase Input span compression Fast conversion time allows low SPI clock rates SPI-programmable modes,read/write capability, status word
• Differential analog input range: ±VREF 0 V to VREF with VREF from 2.4 V to 5.1 V
• Single 1.8 Vsupply operation with 1.71 V to 5.5 V logic interface
• SAR architecture: no latency/pipeline delay
• Valid first accurate conversion
• Guaranteed operation: −40°C to +125°C
• Serial interface: SPI/QSPI/MICROWIRE/DSP compatible
• Ability to daisy-chain multiple ADCs and busy indicator
• 10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP

Typical applications

• Battery-powered equipment
• Medical equipment
• Automatic test equipment/ Machine automation/ Precision data acquisition systems

More information

• Datasheet
• IC product information