STEVAL-CCA019V1 STMicroelectronics, STEVAL-CCA019V1 Datasheet - Page 21

• Manufacturer Part Number: STEVAL-CCA019V1
• Description: BOARD EVAL AUDIO AMP FOR TS4982
• Manufacturer: STMicroelectronics

Specifications of STEVAL-CCA019V1

• Amplifier Type: Class AB
• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 2W x 2 @ 4 Ohm; 125mW x 2 @ 16 Ohm
• Voltage - Supply: 5.0V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4982
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 5 V
• Output Power: 2 W
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4982
• Other names: 497-10339

TS4982
4.7
PC beep
The PC beep input allows to send a system beep (for instance power-on self-test error
code) through the amplifiers to the loudspeaker or (and) headphone output. In the typical
application (see
the signal appear on the detector input with the minimum amplitude Vin
minimum frequency F
loudspeaker (SPKREN = 0) or headphone (HDEN = 1) path. The signal from the
loudspeaker or headphone inputs are not muted. The beep signal pass-through is switched
off when there is no signal with sufficient amplitude Vin
time period.
The overall gain in the typical application (Rin = Rfeed = 47 kΩ) is equal to the loudspeaker
or headphone gain setting.
Figure 42. PC beep input stage
The input capacitor Cinbeep with input resistor Rin forms a high-pass filter with a -3 dB low
frequency cut-off F
For a typical application (Rin = 47 kΩ , F
If it is necessary to change the minimum amplitude Vin
BEEP input amplifier has to be changed. For a typical application (Rin = Rfeed = 47 kΩ) the
gain is -1 V/V.
If Vin
MIN2
PC BEEP INPUT
is a new requested minimum amplitude then a new input resistor Rin is:
Figure
GND
Vin
CL
Cinbeep
MIN
which must be lower than F
47nF
Rin Ω
1) the input is passed through when eight sequential rising edges in
[ ]
= 400 Hz. The PC beep signal is mixed with gain = -1 V/V into a
External
Rin
47k
=
Doc ID 14527 Rev 2
Av
Rfeed
--------------------------------------------- -
Cinbeep
PC BEEP
=
Internal (TS4982)
Vin
–
Rfeed
---------------- -
⋅
MIN
Rin
MIN
Vin
≥
------------------------------------------- -
2π
= 400 Hz) a good choice is Cinbeep = 47 nF.
MIN2
Avbeep
=
Rfeed
⋅
47k
–
Rin
47000
--------------- -
47000
=
MIN
1
5875
⋅
.
F
=
MIN
MIN
MIN
⋅
–
VOLT. & FREQ.
1
Vin
DETECTOR
present during a 1/F
= 0.8 V
MIN2
[
V
P-P
Application information
PP
GND
]
the gain of the PC
MIN
LOUDSPEAKER
= 0.8 V
AUDIO INPUT
AUDIO INPUT
HEADPHONE
MIN
(1/400 s)
P-P
and
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