OPA835 - Ultra Low Power, Rail to Rail Out, Negative Rail In, VFB Amplifier

The OPA835 and OPA2835 devices (OPAx835) are single and dual ultra-low-power, rail-to-rail output, negative-rail input, voltage-feedback (VFB) operational amplifiers designed to operate over a power supply range of 2.5-V to 5.5-V with a single supply, or ±1.25-V to ±2.75-V with a dual supply. Consuming only 250 µA per channel and with a unity gain bandwidth of 56 MHz, these amplifiers set an industry-leading performance-to-power ratio for rail-to-rail amplifiers.

For battery-powered, portable applications where power is of key importance, the low power consumption and high-frequency performance of the OPA835 and OPA2835 devices offers performance versus power that is not attainable in other devices. Coupled with a power-savings mode to reduce current to < 1.5 µA, these devices offer an attractive solution for high-frequency amplifiers in battery-powered applications.

The OPA835 RUN package option includes integrated gain-setting resistors for the smallest possible footprint on a printed-circuit-board (approximately 2.00 mm × 2.00 mm). By adding circuit traces on the PCB, gains of +1, –1, –1.33, +2, +2.33, –3, +4, –4, +5, –5.33, +6.33, –7, +8 and inverting attenuations of –0.1429, –0.1875, –0.25, –0.33, –0.75 can be achieved.

The OPA835 and OPA2835 devices are characterized for operation over the extended industrial temperature range of –40°C to +125°C.

• Ultra-Low Power
  • Supply Voltage: 2.5 V to 5.5 V
  • Quiescent Current: 250 µA/ch (Typical)
  • Power Down Mode: 0.5 µA (Typical)
• Bandwidth: 56 MHz (A_V = 1 V/V)
• Slew Rate: 160 V/µs
• Rise Time: 10 ns (2 V_STEP)
• Settling Time (0.1%): 55 ns (2 V_STEP)
• Overdrive Recovery Time: 200 ns
• SNR: 0.00015% (–116.4 dBc) at 1 kHz (1 V_RMS)
• THD: 0.00003% (–130 dBc) at 1 kHz (1 V_RMS)
• HD₂/HD₃: –70 dBc/–73 dBc at 1 MHz (2 V_PP)
• Input Voltage Noise: 9.3 nV/√Hz (f = 100 kHz)
• Input Offset Voltage: 100 µV (±500-µV Maximum)
• CMRR: 113 dB
• Output Current Drive: 40 mA
• RRO: Rail-to-Rail Output
• Input Voltage Range: –0.2 V to 3.9 V
  (5-V Supply)
• Operating Temperature Range:
  –40°C to +125°C