OPA1611_15 Datasheet, PDF (12/31 Pages) Texas Instruments – SoundPlus High-Performance, Bipolar-Input Audio Operational Amplifiers

OPA1611, OPA1612
SBOS450C – JULY 2009 – REVISED AUGUST 2014
7 Detailed Description
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7.1 Overview
The OPA161x family of bipolar-input operational amplifiers achieve very low 1.1-nV/√Hz noise density with
an ultralow distortion of 0.000015% at 1 kHz. The rail-to-rail output swing, within 600 mV with a 2-kΩ load,
increases headroom and maximizes dynamic range. These devices also have a high output drive capability
of ±40 mA. The wide supply range of ±2.25 V to ±18 V, on only 3.6 mA of supply current per channel, makes
them applicable to both 5V systems and 36V audio applications. The OPA1611 and OPA1612 op amps are
unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions.
7.2 Functional Block Diagram
V+
Pre-Output Driver
IN-
IN+
OUT
V-
Figure 29. OPA1611 Simplified Schematic
7.3 Feature Description
7.3.1 Power Dissipation
The OPA1611 and OPA1612 series op amps are capable of driving 2-kΩ loads with a power-supply voltage up
to ±18 V. Internal power dissipation increases when operating at high supply voltages. Copper leadframe
construction used in the OPA1611 and OPA1612 series op amps improves heat dissipation compared to
conventional materials. Circuit board layout can also help minimize junction temperature rise. Wide copper traces
help dissipate the heat by acting as an additional heat sink. Temperature rise can be further minimized by
soldering the devices to the circuit board rather than using a socket.
7.3.2 Electrical Overstress
Designers often ask questions about the capability of an operational amplifier to withstand electrical overstress.
These questions tend to focus on the device inputs, but may involve the supply voltage pins or even the output
pin. Each of these different pin functions have electrical stress limits determined by the voltage breakdown
characteristics of the particular semiconductor fabrication process and specific circuits connected to the pin.
Additionally, internal electrostatic discharge (ESD) protection is built into these circuits to protect them from
accidental ESD events both before and during product assembly.
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