OPA211-EP Datasheet, PDF (14/23 Pages) Texas Instruments – 1.1nV/√Hz NOISE, LOW POWER, PRECISION OPERATIONAL AMPLIFIER

OPA211-EP
SBOS638 – JUNE 2012
www.ti.com
APPLICATION INFORMATION
The OPA211 is a unity-gain stable, precision op amp
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 45 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 = –55°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 45. OPA211 Simplified Schematic
14
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