1 Features
• THD+N, 50 mW, 32 Ω, 1 kHz, –109 dB
• Wide supply range:
– 4.5 V to 36 V, ±2.25 V to ±18 V
• Low offset voltage: ±0.25 mV
• Low offset drift: ±0.5 μV/°C
• Gain bandwidth: 10 MHz
• Low input bias current: ±10 pA
• Low quiescent current: 1.6 mA per amplifier
• Low noise: 8 nV/√Hz
• EMI- and RFI-filtered inputs
• Input range includes negative supply
• Input range operates to positive supply
• Rail-to-rail output
• High common-mode rejection: 120 dB
• Packages:
– Industry-standard SOIC-8
– micro WSON-8

2 Applications
• Professional microphones and wireless systems
• Professional audio mixer and control surface
• Guitar amp and other music instrument amps
• A/V receiver
• Bookshelf stereo system
• Professional audio amplifier (rack mount)
• DJ equipment
• Turntable
• Special function module

3 Description
The OPA1688 36-V, single-supply, low-noise
SoundPlus™ audio operational amplifier is capable of
operating on supplies ranging from 4.5 V (±2.25 V) to
36 V (±18 V). This latest addition of a high-voltage
audio operational amplifier in conjunction with the
OPA16xx devices provide a family of bandwidth,
noise, and power options to meet the needs of a wide
variety of applications. The OPA1688 is available in
a WSON micropackage, and offers low offset, drift,
and quiescent current. This device also offers wide
bandwidth, fast slew rate, and high output current
drive capability.
Unlike most op amps that are specified at only one
supply voltage, the OPA1688 is specified from 4.5 V
to 36 V. Input signals beyond the supply rails do not
cause phase reversal. The input can operate 100 mV
below the negative rail and within 2 V of the top rail
during normal operation. Note that this device can
operate with full rail-to-rail input 100 mV beyond the
top rail, but with reduced performance within 2 V of
the top rail.
The OPA1688 is specified from –40°C to +85°C.