OPA211AIDRGR Datasheet, PDF (14/37 Pages) Texas Instruments – 1.1nV/√Hz Noise, Low Power, Precision Operational Amplifier in Small DFN-8 Package

OPA211
OPA2211
SBOS377G – OCTOBER 2006 – REVISED MAY 2009...................................................................................................................................................... www.ti.com
APPLICATION INFORMATION
The OPA211 and OPA2211 are unity-gain stable,
precision op amps with very low noise. Applications
with noisy or high-impedance power supplies require
decoupling capacitors close to the device pins. In
most cases, 0.1µF capacitors are adequate.
Figure 44 shows a simplified schematic of the
OPA211. This die uses a SiGe bipolar process and
contains 180 transistors.
OPERATING VOLTAGE
OPA211 series op amps operate from ±2.25V to
±18V supplies while maintaining excellent
performance. The OPA211 series can operate with as
little as +4.5V between the supplies and with up to
+36V between the supplies. However, some
applications do not require equal positive and
negative output voltage swing. With the OPA211
series, power-supply voltages do not need to be
equal. For example, the positive supply could be set
to +25V with the negative supply at –5V or
vice-versa.
The common-mode voltage must be maintained
within the specified range. In addition, key
parameters are assured over the specified
temperature range, T_A = –40°C to +125°C.
Parameters that vary significantly with operating
voltage or temperature are shown in the Typical
Characteristics.
V+
Pre-Output Driver
IN-
IN+
OUT
V-
Figure 44. OPA211 Simplified Schematic
14
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