Single/Dual/Quad Ultra-Low Input Bias Current, Low-Noise Amplifiers

The MAX40079/MAX40087/MAX40077/MAX40089/MAX40078 are wide band, low-noise, low-input bias current operational amplifiers that offer rail-to-rail outputs and single-supply operation from 2.7V to 5.5V. These low-noise amps draw 2.2mA of quiescent supply current per amplifier. This family of amplifiers offers ultra-low distortion (0.0002% THD+N), as well as low input voltage-noise density (4.2nV/√Hz) and low input current-noise density (0.5fA/√Hz). The low input bias current of 0.3pA (typ) and low noise (4.5nV/√Hz), together with the wide bandwidth, provides excellent performance for trans-impedance (TIA) and imaging applications.

These amplifiers have outputs which swing rail-to-rail and their input common-mode voltage range includes ground. The MAX40079/MAX40077/MAX40078 are single/dual/quad respectively in unity-gain stable with a bandwidth of 10MHz. The MAX40087/MAX40089 are single/dual respectively with gain ≥ 5 stable and bandwidth of 42MHz. They operate over the full -40°C to +125°C temperature range.

Single channel op amps are available in 6-bump wafer-level package (WLP) and SOT23 6-pin packages. The dual channel op amps are available in 8-bump WLP and µMAX-8 packages. The quad channel option is available in 14-TSSOP package.

Applications

* ADC Buffers * DAC Output Amplifiers * Digital Scales * Low-Noise Microphone/Preamplifiers * Medical Instrumentation * pH Probes and Reference Electrodes * Strain Gauges/Sensor Amplifiers * Transimpedance Amplifiers

* Low Input Voltage Noise Density: 4.2nV/ at 30KHz

* Low Input Current Noise Density: 0.5fA/

* Low Input Bias Current: 0.3pA (typ)

* Low Distortion: 0.00035% or -109dB THD+N (1kΩ Load)

* Single-Supply Operation from +2.7V to +5.5V

* Input Common-Mode Voltage Range Includes Ground

* Rail-to-Rail Output Swings with a 1kΩLoad

* Wide Bandwidth: MAX 40079/MAX40077/MAX40078 (10MHz); MAX40087/MAX40089 (42MHz)

* Excellent DC Characteristics: VOS ≤ 30µV

* Single-Channel 6-bump WLP in 1.31mm x 0.73mm with 0.35mm Bump Pitch

* Dual-Channel 8-bump WLP in 0.96mm x 1.66mm with 0.35mm Bump Pitch

* Available in Space-Saving 6-WLP, 6-SOT, 8-WLP, and µMAX Packages