OPA838 - 1-mA, 300-MHz Gain Bandwidth, Voltage-Feedback Op Amp

The OPA838 decompensated voltage feedback operational amplifier provides a high 300-MHzgain bandwidth product with 1.8-nV/√Hz input noise voltage, requiring only atrimmed 0.95-mA supply current. These features combine to provide an extremely power-efficientsolution for photodiode transimpedance designs and high-voltage gain stages, which require thelowest input voltage noise in signal receiver applications.

Operating at the minimum recommended noninverting gain of 6 V/V results in a 90-MHz,–3-dB bandwidth. Extremely low input noise and offset voltage make the OPA838 particularly suitablefor high gains. Even at a DC-coupled gain of 1000 V/V, a 300-kHz signal bandwidth is available witha maximum output offset voltage of ±125 mV.

The single-channel OPA838 is available in 6-pin SOT-23 and SC70 packages with a powershutdown feature and a 5-pin SC70 package.

• Gain Bandwidth Product: 300 MHz
• Very-Low (Trimmed) Supply Current: 950 µA
• Bandwidth: 90 MHz (A_V = 6 V/V)
• High Full-Power Bandwidth: 45 MHz, 4 V_PP
• Negative Rail Input, Rail-to-Rail Output
• Single-Supply Operating Range: 2.7 V to 5.4 V
• 25°C Input Offset: ±125 µV (Maximum)
• Input Offset Voltage Drift: < ±1.6 µV/°C (Maximum)
• Input Voltage Noise: 1.8 nV/√Hz (> 200 Hz)
• Input Current Noise: 1 pA/√Hz (> 2000 Hz)
• < 1-µA Shutdown Current for Power Savings

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