2003 Mar 20
15
Philips Semiconductors
Objective specification
2
×
25 W class-D power amplifier
TDA8922
8. B = 22 Hz to 22 kHz; independent of R
s
.
9. P
o
= 1 W; R
s
= 0
Ω
; f
i
= 1 kHz.
10. V
i
= V
i(max)
= 1 V (RMS); maximum limit is guaranteed, but may not be 100% tested.
15 DYNAMIC AC CHARACTERISTICS (MONO BTL APPLICATION)
V
P
=
±
15 V; R
L
= 8
Ω
; f
i
= 1 kHz; f
osc
= 310 kHz; R
sL
< 0.1
Ω
(note 1); T
amb
= 25
°
C; measured in Fig.10; unless
otherwise specified.
Notes
1. R
sL
is the series resistance of inductor of low-pass LC filter in the application.
2. Output power is measured indirectly; based on R
DSon
measurement.
3. Total harmonic distortion is measured in a bandwidth of 22 Hz to 22 kHz. When distortion is measured using a low
order low-pass filter a significant higher value will be found, due to the switching frequency outside the audio band.
Maximum limit is guaranteed but may not be 100% tested.
4. Output power measured across the loudspeaker load.
5. V
ripple
= V
ripple(max)
= 2 V (p-p); R
s
= 0
Ω
.
6. B = 22 Hz to 22 kHz; R
s
= 0
Ω
; maximum limit is guaranteed, but may not be 100% tested.
7. B = 22 Hz to 22 kHz; R
s
= 10 k
Ω
.
8. B = 22 Hz to 22 kHz; independent of R
s
.
9. V
i
= V
i(max)
= 1 V (RMS); f
i
= 1 kHz; maximum limit is guaranteed, but may not be 100% tested.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
P
o
output power
R
L
= 8
Ω
; V
P
=
±
15 V; note 2
THD = 0.5%
37
40
−
W
THD = 10%
46
50
−
W
THD
total harmonic distortion
P
o
= 1 W; note 3
f
i
= 1 kHz
−
0.015
0.05
%
f
i
= 10 kHz
−
0.02
−
%
G
v(cl)
closed loop voltage gain
35
36
37
dB
η
efficiency
P
o
= 50 W; f
i
= 1 kHz; note 4
85
90
−
%
SVRR
supply voltage ripple rejection
operating; note 5
f
i
= 100 Hz
−
49
−
dB
f
i
= 1 kHz
36
44
−
dB
mute; f
i
= 100 Hz; note 5
−
49
−
dB
standby; f
i
= 100 Hz; note 5
−
80
−
dB
Z
i
input impedance
22
34
−
k
Ω
V
n(o)
noise output voltage
operating
R
s
= 0
Ω
; note 6
−
280
560
µ
V
R
s
= 10 k
Ω
; note 7
−
300
−
µ
V
mute; note 8
−
280
−
µ
V
V
o(mute)
output signal in mute
note 9
−
−
500
µ
V
CMRR
common mode rejection ratio
V
i(CM)
= 1 V (RMS)
−
75
−
dB
