The ADA4350 is an analog front end for photodetectors or other
sensors whose output produces a current proportional to the
sensed parameter or voltage input applications where the system
requires the user to select between very precise gain levels to
maximize the dynamic range.
The ADA4350 integrates a FET input amplifier, a switching network,
and an ADC driver with all functions controllable via a serial
peripheral interface (SPI) or parallel control logic into a single
IC. The FET input amplifier has very low voltage noise and current
noise making it an excellent choice to work with a wide range of
photodetectors, sensors, or precision data acquisition systems.
Its switching network allows the user individual selection of up
to six different, externally configurable feedback networks; by
using external components for the feedback network, the user
can more easily match the system to their desired photodetector or
sensor capacitance. This feature also allows the use of low thermal
drift resistors, if required.
The design of the switches minimizes error sources so that they
add virtually no error in the signal path. The output driver can
be used in either single-ended or a differential mode and is
ideal for driving the input of an ADC.
The ADA4350 can operate from a single +3.3 V supply or a dual
±5 V supply, offering user flexibility when choosing the polarity of
the detector. It is available in a Pb-free, 28-lead TSSOP package and
is specified to operate over the −40°C to +85°C temperature range.
Multifunction pin names may be referenced by their relevant
function only.
Applications
- Current to voltage (I to V) conversions
- Photodiode preamplifiers
- Chemical analyzers
- Mass spectrometry
- Molecular spectroscopy
- Laser/LED receivers
- Data acquisition systems
