DEMOTS4997Q STMicroelectronics, DEMOTS4997Q Datasheet - Page 3

• Manufacturer Part Number: DEMOTS4997Q
• Description: Audio Modules & Development Tools DEMO BOARD TS4997Q BRD
• Manufacturer: STMicroelectronics

Specifications of DEMOTS4997Q

• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.7 V to 5.5 V
• Output Power: 1 W
• Product: Audio Modules
• For Use With/related Products: TS4997
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN2514
Table 1.
3D effect enhancement
The TS4997 features 3D audio effects that can be programmed at three discrete levels
(LOW, MEDIUM, HIGH) through input pins 3D1 and 3D0 which provide a digital interface.
The correspondence between the logic levels of this interface and 3D effect levels are
shown in
The 3D audio effect applied to stereo audio signals evokes perception of spatial hearing and
improves this effect in cases where the stereo speakers are too close to each other, such as
in small handheld devices, or mobile equipment.
The perceived amount of 3D effect is also dependent on many factors such as speaker
position, distance between speakers and listener, frequency spectrum of audio signal, or
difference of signal between left and right channel. In some cases, the volume can increase
when switching on the 3D effect. This factor is dependent on the composition of the stereo
audio signal and its frequency spectrum.
Table 2.
Components
3D effect level
R
C
C
C
Table 2.
IN
IN
S
B
MEDIUM
HIGH
External component descriptions
3D effect settings
LOW
OFF
Input resistors that set the closed loop gain in conjunction with a fixed internal
feedback resistor (Gain = R
Input coupling capacitors that block the DC voltage at the amplifier input
terminal. Thanks to common mode feedback, these input capacitors are
optional. However, if they are added, they form with R
filter with -3dB cut-off frequency (f
Supply bypass capacitors that provide power supply filtering.
Bypass pin capacitor that provides half supply filtering.
3D0
0
0
1
1
Functional description
feed
/R
IN
cut-off
, where R
Description of the evaluation board
= 1 / (2 x π x R
feed
= 50kΩ).
IN
IN
a 1st order high pass
x C
3D1
IN
0
1
0
1
)).
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