1 Features
• 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 (AV = 1 V/V)
• Slew Rate: 160 V/μs
• Rise Time: 10 ns (2 VSTEP)
• Settling Time (0.1%): 55 ns (2 VSTEP)
• Overdrive Recovery Time: 200 ns
• SNR: 0.00015% (–116.4 dBc) at 1 kHz (1 VRMS)
• THD: 0.00003% (–130 dBc) at 1 kHz (1 VRMS)
• HD2/HD3: –70 dBc/–73 dBc at 1 MHz (2 VPP)
• 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

2 Applications
• Low-Power Signal Conditioning
• Audio ADC Input Buffer
• Low-Power SAR and ΔΣ ADC Driver
• Portable Systems
• Low-Power Systems
• High-Density Systems
• Ultrasonic Flow Meter

3 Description
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-torail
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. See Table 9-1 and Table 9-2 for details.
The OPA835 and OPA2835 devices are characterized
for operation over the extended industrial temperature
range of –40°C to +125°C.