TDA7297D Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
TDA7297D Datasheet PDF : 11 Pages
| |||
TDA7297D
Table 4. Electrical Characteristcs (VCC = 13V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise
specified)
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
VCC Supply Range
6.5
18
V
Iq
Total Quiescent Current
RL = ∞
50
65
mA
VOS Output Offset Voltage
120 mV
PO Output Power
THD 10%
8.3
10
W
THD Total Harmonic Distortion
PO = 1W
0.1
0.3
%
PO = 0.1W to 5W
f = 100Hz to 15KHz
1
%
SVR Supply Voltage Rejection
f = 100Hz, VR =0.5V
40
56
dB
CT Crosstalk
46
60
dB
AMUTE Mute Attenuation
60
80
dB
Tw Thermal Threshold
150
°C
GV Closed Loop Voltage Gain
31
32
33
dB
∆GV Voltage Gain Matching
0.5
dB
Ri Input Resistance
25
30
KΩ
VTMUTE Mute Threshold
Vo = -30dB
2.3
2.9
4.1
V
VTST-BY St-by Threshold
0.8
1.3
1.8
V
IST-BY St-by Current
100
µA
eN Total Output Noise Voltage
A Curve
f = 20Hz to 20KHz
150
µV
220 500
µV
3 APPLICATIVE SUGGESTIONS
STAND-BY AND MUTE FUNCTIONS
3.1 Microprocessor Application
In order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guarantee the right St-
by and mute signals sequence.It is quite simple to obtain this function using a microprocessor (Fig. 4 and 5).
At first St-by signal (from µP) goes high and the voltage across the St-by terminal (Pin 9) starts to increase ex-
ponentially. The external RC network is intended to turn-on slowly the biasing circuits of the amplifier, this to
avoid "POP" and "CLICK" on the outputs.
When this voltage reaches the St-by threshold level, the amplifier is switched-on and the external capacitors in
series to the input terminals (C1, C3) start to charge.
It's necessary to mantain the mute signal low until the capacitors are fully charged, this to avoid that the device
goes in play mode causing a loud "Pop Noise" on the speakers.
A delay of 100-200ms between St-by and mute signals is suitable for a proper operation.
3/11
Share Link: 