Dual-Channel, Precision, Programmable Gain Transimpedance Amplifier (PGTIA) with Integrated Gain Resistors

The ADA4352-2 is a compact, monolithic, dual-channel, precision, programmable gain transimpedance amplifier (PGTIA). The ADA4352-2 is a breakthrough solution for precisely measuring small currents over a wide dynamic range. The precision of the ADA4352-2 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 ADA4352-2 integrates four current-to-voltage gain selections per channel, and the gain is programmable using two logic pins per channel to provide a flexible, fully functional compact PGTIA solution. Additionally, with its robust output stage and low noise, the ADA4352-2 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.

The ADA4352-2 is offered in a 3 mm × 3 mm LFCSP, reducing the printed circuit board (PCB) area by up to 10 times relative to a discrete design using standalone operational amplifiers (op amps) and switches.

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)

* Small, dual-channel, complete PGTIA and AFE

solution

* Small size package: 16-lead LFCSP, 3 mm × 3 mm

* Integrated four internal gains per channel

* Range 0, internal RF = 315 Ω

* Range 1, internal RF = 3.5 kΩ

* Range 2, internal RF = 40.2 kΩ

* Range 3, internal RF = 450 kΩ

* Wide input current dynamic ranges from 100

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 switch integrated switch impedance 19Ω

maximum, −40°C to +125°C