TDF8544
NXP Semiconductors
I2C-bus controlled 4 50 W power amplifier
Table 20. Characteristics …continued
Refer to test circuit (see Figure 30) at Tamb = 25 C; VP = 14.4 V; unless otherwise specified. Tested at Tamb = 25 C;
guaranteed for Tj = 40 C to +150 C; functionality is guaranteed for VP < 10 V unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Start-up/shut-down/mute timing
twake
wake-up time
time after wake-up via pin STB
before first I2C-bus transmission
is recognized; see Figure 4
-
300
500
s
ILO(SVR)
output leakage current on
pin SVR
-
-
5
A
[2]
td(mute_off)
mute off delay time
time from amplifier start to 10 %
of output signal; ILO = 0 A
I2C-bus mode;
-
-
430
430
650
650
ms
ms
with ILO = 5 A +15 ms;
no DC-load (IB1[D1] = 0); see
Figure 4
legacy mode;
with ILO = 5 A +20 ms;
VSTB = 7 V; RADSEL = 0 ;
see Figure 5
[2]
tamp_on
amplifier on time
time from amplifier start to
amplifier on; 90 % of output
signal; ILO = 0 A
I2C-bus mode;
-
-
550
550
800
800
ms
ms
with ILO = 5 A +30 ms;
no DC-load (IB1[D1] = 0); see
Figure 4
legacy mode;
with ILO = 5 A +20 ms;
VSTB = 7 V; RADSEL = 0 ;
see Figure 5
[2]
toff
amplifier switch-off time
time to DC output voltage < 0.1 V;
ILO = 0 A
I2C-bus mode;
with ILO = 5 A +0 ms;
see Figure 4
250
250
5
500
500
15
750
750
40
ms
ms
ms
via pin STB; (IB4[D6] = 0);
with ILO = 5 A +0 ms;
see Figure 5
td(mute-on)
td(soft_mute)
td(fast_mute)
delay time from mute to on from 10 % to 90 % of output
signal; Vi = 50 mV; I2C-bus mode
(IB2[D1] = 1 to 0, or legacy mode
(VSTB = 2 V to 7 V); see Figure 5
soft mute delay time
fast mute delay time
from 90 % to 10 % of output
5
-
15
40
1
ms
ms
signal; Vi = 50 mV; I2C-bus mode
(IB2[D1] = 0 to 1) or legacy mode
(VSTB = 7 V to 2 V); see Figure 5
from 90 % to 10 % of output
signal; Vi = 50 mV; I2C-bus mode
(IB2[D0] = 0 to 1, or VSTB from
> 5.9 V to < 0.8 V in 1 s; see
Figure 5
0.4
TDF8544
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 29 August 2011
34 of 54
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