OPA838IDBVR

The OPA838 decompensated voltage-feedback op amp delivers up to 300MHz gain-bandwidth product at 1.8nV/√Hz input voltage noise, requiring only 0.95mA quiescent supply current. This combination provides an extremely power-efficient solution for photodiode transimpedance designs and high-voltage-gain stages that demand minimum input voltage noise in signal receiver applications. Operating at the minimum recommended non-inverting gain of 6V/V yields a 90MHz, –3dB bandwidth. The ultra-low input noise and offset voltage make the OPA838 particularly well suited for high-gain applications. Even at a DC-coupled gain of 1000V/V, a 300kHz signal bandwidth is achievable with a maximum output offset voltage of ±125mV. The single-channel OPA838 is available in 6-pin SOT-23 and SC70 packages (with power shutdown feature) and a 5-pin SC70 package. 3V single-supply photodiode amplifier under 3mW, with total input-referred current noise below 1.1pA/√Hz and overall SSBW of 1MHz at 100kΩ gain

Applications

• Low-power transimpedance amplifier
• Low-noise, high-gain stage
• 12-bit to 16-bit low-power SAR ADC driver
• High-gain active filter design
• Ultrasonic flow meter

Key features

• Gain bandwidth product: 300MHz
• Ultra-low (trimmed) supply current: 950μA
• Bandwidth: 90MHz (AV = 6V/V)
• High full-power bandwidth: 45MHz, 4VPP
• Negative rail input, rail-to-rail output
• Single-supply operating voltage range: 2.7V to 5.4V
• Input offset voltage at 25°C: ±125μV (maximum)
• Input offset voltage drift: < ±1.6μV/°C (maximum)
• Input voltage noise: 1.8nV/√Hz (>200Hz)
• Input current noise: 1pA/√Hz (>2000Hz)
• Shutdown current less than 1μA for power savings