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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)