Features and Benefits
- Low noise, low input bias current FET input amplifier
- Very low input bias current: ±0.25 pA typical at 25°C
- Low input voltage noise
92 nV/√Hz typical at 10 Hz at 5 V
5 nV/√Hz typical at 100 kHz at ±5 V
- Gain bandwidth product: 175 MHz
- Input capacitance
3 pF typical, differential mode
2 pF typical, common mode
- Integrated gain switching
- Sampling and feedback switch off leakage: ±0.5 pA typical
- Worst case tON/tOFF times: 105 ns typical/65 ns typical
- Integrated analog-to-digital converter (ADC) driver
- Differential mode and single-ended mode
- Adjustable output common-mode voltage
−5 V to +3.8 V typical for ±5 V supply
- Wide output voltage swing: ±4.8V minimum for ±5 V supply
- Linear output current: 18 mA rms typical for ±5V supply
- See data sheet for additional features
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.
- Current to voltage (I to V) conversions
- Photodiode preamplifiers
- Chemical analyzers
- Mass spectrometry
- Molecular spectroscopy
- Laser/LED receivers
- Data acquisition systems
Markets and Technologies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The EVAL-ADA4350RUZ-P evaluation board is designed to evaluate the ADA4350 offered in a 28-lead, 9.8 mm × 6.4 mm thin shrink small outline package (TSSOP). The evaluation board is a populated board that enables users to quickly prototype the best configuration of the analog front end for their systems.
The evaluation board is a 6-layer printed circuit board (PCB) designed to minimize leakage currents with its guard ring features. It accepts SMA edge mounted connectors on the inputs and outputs for efficient connection to test equipment or other circuitry.
The evaluation board components are primarily SMT 0603 case size with the exception of the electrolytic bypass capacitors (C9, C10, and C13), which are 1206 case size.
Tools & Simulations
Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.