OPA211_08 Datasheet, PDF (13/17 Pages) Texas Instruments – 1.1nV/√Hz Noise, Low Power, Precision Operational Amplifier in Small DFN-8 Package

OPA211
OPA2211
www.ti.com
SBOS377D – OCTOBER 2006 – REVISED FEBRUARY 2008
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 38 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 38. OPA211 Simplified Schematic
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Product Folder Link(s): OPA211 OPA2211