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參數(shù)資料
| 型號(hào)： | TA8876FA |
| 元件分類： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDSO30 |
| 封裝： | 0.375 INCH, 1 MM PITCH, PLASTIC, SSOP-30 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 443K |
| 代理商： | TA8876FA |
TDF8554J
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2011
18 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
An AC-coupled speaker reduces the impedance at the output of the amplifier in a certain
frequency band. The presence of an AC-coupled speaker can be determined using a high
current mode (IB4[D5] = 0, see Figure 12) or using a low current detection mode
(IB4[D5] = 1; see Figure 13).
If for instance a 19 kHz input signal is generated with a peak output voltage of 2 V the
I2C-bus bits are guaranteed to be set with a (total AC + DC) load less than 4
and are
guaranteed not set with a load of more than 9
.
When IB1[D1] = 1 the AC-load detection measurement cycle is enabled, the peak counter
is reset and the measuring cycle starts. The AC-load detection can only be performed
after the amplifier has completed its start-up cycle. Since the AC-load information in the
I2C-bus bits is combined with the start-up diagnostics, the AC-load information can be
read when IB4[D0] = 0. If IB4[D0] = 1, the stored AC-load bits cannot be read, but their
values are preserved.
The interpretation of the line driver and amplifier mode DC load bit for AC load detection is
shown in Table 6.
Table 6.
AC load detection
IB4[D0] = 0
DB1 to 4 [D4] (AC load bit)
No AC load detected
0
AC load detected
1
Fig 12. AC-load impedance as a function of peak output voltage (high current AC-load
detection)
001aam701
VoM (V)
06
4
2
10
15
5
20
25
ZL
(
Ω)
0
trip level
load detected,
l2C-bus bits set
no load detected,
l2C-bus bits not set
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