Analog Devices Inc. AD4693/AD4694 Easy Drive Multiplexed SAR ADCs
Analog Devices AD4693/AD4694 Easy Drive Multiplexed SAR Analog-to-Digital Converters (ADCs) are compact, high-accuracy, 8-channel, 16-bit successive approximation register (SAR) devices optimized for high-density, multichannel precision data-acquisition solutions. The AD4693/AD4694 combine precision performance with Easy Drive features and flexible digital processing to ensure compatibility with space-constrained analog front-end (AFE) designs and low-power digital hosts.
The AD4693/AD4694 Easy Drive features broaden the selection of compatible amplifiers and voltage references. The precharge buffers enable smaller and lower-power AFE designs by significantly reducing input voltage and current transients that typically force AFEs to include high-bandwidth ADC driver amplifiers per channel. The WLCSP model also includes an integrated reference buffer, which provides a true, buffered reference input.
The AD4693/AD4694 digital features and serial interface are optimized for use with low-power or power-cycled microcontrollers. The AD4693/AD4694 include averaging filters per channel and a customizable channel sequencer, which, combined, enable on-chip noise filtering with channel-independent averaging ratios. An integrated burst sampling timer enables autonomous and burst sampling schemes to perform conversions with minimal digital resources. Device configuration and ADC data readback are supported via a robust, 4-wire serial peripheral interface (SPI) with optional cyclic redundancy check (CRC).
The Analog Devices AD4693/AD4694 are available in a 4mm × 4mm, 24-lead lead frame chip scale package (LFCSP) and a 2.96mm × 2.96mm, 36-ball wafer-level chip scale package (WLCSP), with operation specified from -40°C to +125°C.
Features
- Easy Drive features enable compact system designs
- Precharge buffers reduce analog input and reference circuit drive requirements
- On-chip reference buffer (WLCSP only)
- Small footprint, big performance
- 500kSPS (AD4693) and 1MSPS (AD4694) sample rates
- ±0.85LSB (max.) INL
- Guaranteed 16-bit, no missing codes
- First conversion accurate
- 93dB (typ.), fIN = 1kHz SINAD
- 14.6mW at fS = 1MSPS and 7.3mW at fS = 500kSPS
- 24-lead 4mm × 4mm LFCSP or 36-ball 2.96mm × 2.96mm WLCSP
- Enhanced digital functionality
- Averaging filters per channel
- Customizable channel sequencer
- Interleaved channel sampling
- Autonomous and burst sampling modes
- 4-wire SPI compatible with 1.2V and 1.8V logic
- -40°C to +125°C wide operating temperature range
Applications
- Optical power monitoring
- Medical instrumentation
- Electronic test and measurement
- Automated test equipment
- Battery-powered equipment
Functional Block Diagram
