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LM4894MM Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM4894MM
Description  1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
Download  19 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4894MM Datasheet(HTML) 11 Page - National Semiconductor (TI)

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Typical Performance Characteristics
Non-LD Specific Characteristics (Continued)
PSRR vs
DC Common-Mode Voltage
PSRR vs
DC Common-Mode Voltage
20013780
20013781
THD vs
Common-Mode Voltage
THD vs
Common-Mode Voltage
20013782
20013783
Application Information
DIFFERENTIAL AMPLIFIER EXPLANATION
The LM4894 is a fully differential audio amplifier that fea-
tures differential input and output stages. Internally this is
accomplished by two circuits: a differential amplifier and a
common mode feedback amplifier that adjusts the output
voltages so that the average value remains V
DD/2. When
setting the differential gain, the amplifier can be considered
to have "halves". Each half uses an input and feedback
resistor (R
i1and RF1) to set its respective closed-loop gain
(see Figure 1). With R
i1 =Ri2 and RF1 =RF2, the gain is set
at -R
F/Ri for each half. This results in a differential gain of
A
VD =-RF/Ri
(1)
It is extremely important to match the input resistors to each
other, as well as the feedback resistors to each other for best
amplifier performance. See the Proper Selection of Exter-
nal Components section for more information. A differential
amplifier works in a manner where the difference between
the two input signals is amplified. In most applications, this
would require input signals that are 180˚ out of phase with
each other. The LM4894 can be used, however, as a single
ended input amplifier while still retaining its fully differential
benefits. In fact, completely unrelated signals may be placed
on the input pins. The LM4894 simply amplifies the differ-
ence between them. Figures 2 and 3 show single-ended
applications of the LM4894 that still take advantage of the
differential nature of the amplifier and the benefits to PSRR,
common-mode noise reduction, and "click and pop" reduc-
tion.
All of these applications, either single-ended or fully differ-
ential, provide what is known as a "bridged mode" output
(bridge-tied-load, BTL). This results in output signals at V
o1
and V
o2 that are 180˚ out of phase with respect to each
www.national.com
11


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