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.