OPA328DBVR

The single-channel OPA328 and dual-channel OPA2328 (OPAx328) are a new generation family of precision, low-voltage CMOS operational amplifiers optimized for very low noise and wide bandwidth. The OPAx328 have a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of 120 dB (typical) over the full input range. The input common-mode voltage range extends 100 mV beyond the negative and positive supply rails. The output voltage typically swings within 10 mV of the rails. The OPAx328 also use Texas Instrument's proprietary e-trim™ operational amplifier technology, enabling a unique combination of ultra-low offset and low input offset drift without the need for any input switching or auto-zero techniques. Low-noise (6.1 nV/√Hz) and high-speed operation (40 MHz, 30 V/μs) make these devices a great choice for driving sampling analog-to-digital converters (ADCs). The OPAx328 are also a great choice for high-impedance-input, single-supply applications. Low input bias current and low input capacitance allows for high-frequency transimpedance gains at low photocurrent operation (<1 nA).

Applications

• Optical module
• Position sensor
• Multiparameter patient monitor
• CT and PET scanner
• Chemistry and gas analyzer
• Bidirectional 400-V and 800-V to LV
• Merchant network and server PSU
• String inverter
• Solar power optimizer

Key features

• Precision with zero-crossover distortion
• Low offset voltage: 50 μV (maximum)
• High CMRR: 120 dB
• Rail-to-rail I/O
• Wide bandwidth: 40 MHz
• Low input bias current: 1 pA (maximum)
• Low noise: 6.1 nV/√Hz at 10 kHz
• Slew rate: 30 V/μs
• Fast 0.01% settling time: 180 ns
• Single-supply voltage range: 2.2 V to 5.5 V
• Unity-gain stable