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TAS5704 20-W Stereo Digital Audio Power Amplifier With Feedback TI
Texas Instruments TI
TAS5704 Datasheet PDF : 34 Pages
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TAS5704
www.ti.com
SLOS563 – MARCH 2008
SE INPUT AND SE OUTPUT (TAS5704 Stereo Configuration)
The SE input and output configuration is used with class-AB amplifiers. A block diagram of a fully SE
measurement circuit is shown in Figure 32. SE inputs normally have one input pin per channel. In some cases,
two pins are present; one is the signal and the other is ground. SE outputs have one pin driving a load through
an output ac-coupling capacitor and the other end of the load is tied to ground. SE inputs and outputs are
considered to be unbalanced, meaning one end is tied to ground and the other to an amplifier input/output.
The generator should have unbalanced outputs, and the signal should be referenced to the generator ground for
best results. Unbalanced or balanced outputs can be used when floating, but they may create a ground loop that
affects the measurement accuracy. The analyzer should have balanced inputs to cancel out any common-mode
noise in the measurement.
Generator
VGEN
RGEN
Evaluation Module
Audio Power
Amplifier
CIN
RIN
Lfilt
Cfilt
CL
RL
Analyzer
RANA
CANA
RANA
CANA
Twisted-Pair Wire
Twisted-Pair Wire
Figure 32. SE Input—SE Output Measurement Circuit
The following general rules should be followed when connecting to APAs with SE inputs and outputs:
Use an unbalanced source to supply the input signal.
Use an analyzer with balanced inputs.
Use twisted-pair wire for all connections.
Use shielding when the system environment is noisy.
Ensure the cables from the power supply to the APA, and from the APA to the load, can handle the large
currents (see Table 6).
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TAS5704
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