GENERAL DESCRIPTION
The ADA4351-2 is a compact, monolithic, dual-channel, precision,
programmable gain transimpedance amplifier (PGTIA). The
ADA4351-2 is a breakthrough solution for precisely measuring
small currents over a wide dynamic range. The precision of the
ADA4351-2 over a wide temperature range of −40°C to +125°C
enables users to perform one calibration of the end equipment
at room temperature, thereby saving test time and cost. The
ADA4351-2 integrates two low off leakage current switches per
channel, and the gain is programmable using two user-selectable
external resistors to provide a flexible, fully functional compact
PGTIA solution. Separate analog and digital supplies allow the
amplifier of the ADA4351-2 to operate on bipolar supplies, while
the integrated logic level shifting allows the digital interface to
remain ground referenced. Additionally, with its robust output stage
and low noise, the ADA4351-2 can directly drive 16-bit precision
analog-to-digital converters (ADCs, such as AD4696), providing a
complete analog front-end (AFE) to address the most challenging
precision current measurement applications.

FEATURES
► Small, dual-channel, complete PGTIA and AFE solution
► Small size package:16-lead LFCSP, 3 mm × 3 mm
► Integrated switches, 2 external gains per channel
► Wide input current dynamic range from picoamps to milliamps
► Excellent DC precision
► Low offset voltage: ±100 μV maximum, 25°C
► Low offset voltage drift: ±0.85 μV/°C maximum, −40°C to
+125°C
► Low input bias current: ±9 pA maximum, 25°C
► Low switch off leakage current : ±90 pA maximum (−40°C to
+125°C)
► New integrated architecture eliminates gain error due to switch
resistance
► Single-supply operation: +2.7 V to +5.5 V (dual-supply operation:
±1.85 V to ±2.75 V)
► Wide gain bandwidth product: 8.5 MHz
► Wide operating temperature range: −40°C to +125°C

APPLICATIONS
► Precision current to voltage (I to V) conversion
► Programmable gain TIAs
► Photodetector interface and amplification
► Optical networking equipment
► Optical power measurement
► Instrumentation—spectroscopy and chromatography
► Precision data acquisition systems (DAQ)