The ADAQ4224 is a μModule® precision data acquisition (DAQ)
signal chain solution that reduces the development cycle of a
precision measurement system by transferring the signal chain
design challenge of component selection, optimization, and layout
from the designer to the device. With a guaranteed maximum ±1.0 ppm
INL and no missing codes at 24 bits, the ADAQ4224 achieves
unparalleled precision performance from −40°C to +105°C.
Using system-in-package (SIP) technology, the ADAQ4224 combines
the common signal processing blocks required in a data
acquisition solution in a small footprint, 14 mm × 9mm, 0.8 mm
pitch, 178-ball CSP_BGA package.
The ADAQ4224 integrates the following:
- A low noise, high-bandwidth programmable gain instrumentation amplifier (PGIA).
- A second-order anti-aliasing filter.
- A low-noise, low-distortion, high-bandwidth ADC driver.
- A high precision 24-bit, 2 MSPS successive approximation register (SAR) ADC.
- An electrically isolated, I2C compatible temperature sensor with excellent accuracy of ±1°C maximum.
- A 1.8 V low dropout (LDO) regulator.
- Performance critical passives.
The ADAQ4224 incorporates the critical passive components with
superior matching and drift characteristics using Analog Devices,
Inc., iPassive® technology to minimize temperature dependent error
sources and to offer optimized performance. Integrating the critical
power supply and reference bypass capacitors reduce sensitivity
to the system level board layout. Reducing the solution footprint
enables addition of more functions within the system and hence the
smaller form factor instruments without sacrificing performance.
The system integration solves many design challenges while the
μModule still provides the flexibility of a configurable PGIA to allow
gain or attenuation adjustments, as well as supports the acquisition
of both single-ended and differential signals. The fast settling of
the PGIA and ADC driver stage and no latency of the SAR ADC
provide a unique solution for high channel count, multiplexed signal
chain architectures and control loop applications.
The digital features include Flexi-SPI serial peripheral interface
(SPI), which allow data access via multiple SPI modes as well
as offset correction, gain adjustment, and averaging and reduce
burden on the host processor. A wide data clocking window,
multiple SDO lanes, and optional DDR data clocking reduce the
serial clock frequency while operating at full speed of 2 MSPS and
make it easier to isolate the DAQ solution, which reduces power
dissipation and EMI. Echo clock mode and host clock mode of the
ADAQ4224 relax the timing requirements and simplify the use of
digital isolators.
The Flexi-SPI, PGIA gain control and I2C-compatible temperature
sensor serial user interface is compatible with 1.2 V to 1.8 V, 2.5
V, 3 V, or 5 V logic, using a separate VIO supply. The ADAQ4224
operation is specified from −40°C to +105°C.
APPLICATIONS
- Automatic test equipment
- Machine automation
- Process controls
- Medical and industrial instrumentation
- Digital control loops
