EFM32WG Datasheet, PDF (725/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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30 OPAMP - Operational Amplifier
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What?
Quick Facts
The opamps are low power amplifiers with
a high degree of flexibility targeting a wide
variety of standard opamp application areas.
With flexible gain and interconnection built-
in programming they can be configured to
support multiple common opamp functions,
with all pins available externally for filter
configurations. Each opamp has a rail to rail
input and a rail to rail output.
Why?
The opamps are included to save energy on
a pcb compared to standalone opamps, but
also reduce system cost by replacing external
opamps.
How?
Two of the opamps are made available
as part of the DAC, while the third opamp
is standalone. An ADC unity gain buffer
mode configuration makes it possible to
isolate kickback noise, in addition to popular
differential to single ended and differential
to differential driver modes. The opamps
can also be configured as a one, two- or
three-step cascaded PGA, and for all of the
built-in modes no external components are
necessary.
30.1 Introduction
The opamps are highly configurable general purpose opamps, suitable for simple filters and buffer
applications. The three opamps can be configured to support various operational amplifier functions
through a network of muxes, with possibilities of selecting ranges of on-chip non-inverting and inverting
gain configurations, and selecting between outputs to various destinations. The opamps can also be
configured with external feedback in addition to supporting cascade connections between two or three
opamps. The opamps are rail-to-rail in and out. A user selectable mode has been added to optimize
linearity, in which case the input voltage to the opamp is restricted between VSS and VDD-1.2V.
30.2 Features
• 3 individually configurable opamps
• Opamps support rail-to-rail inputs and outputs
• Supports the following functions
• General Opamp Mode
• Voltage Follower Unity Gain
• Inverting Input PGA
• Non-inverting PGA
• Cascaded Inverting PGA
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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