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參數(shù)資料
| 型號： | 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)： | 11/20頁 |
| 文件大?。?/td> | 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
19 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
7.5.4 Distortion (clip-) detection
If the amplifier output clips to the supply voltage or ground, the output signal becomes
distorted. If the distortion per channel exceeds a selectable threshold (2 %, 5 % or 10 %),
pin DIAG is activated.
The clip detection level can be programmed via the I2C-bus. The clip information is
blocked below a supply voltage of 10 V to avoid false clip detection during engine start, or
can be programmed to operate at the low voltage detection level of 7.2 V or 5.5 V.
Since it is possible to have different amplifier gain settings between the front and rear
channels and there is only one clip reference current, the clip detect levels are only
accurate for the channels with the highest gain. In line driver mode the DC-output voltage
is 0.24VP and clip detection will still indicate a clip, but the levels will not be accurate.
7.6 Line driver mode and low gain mode
The TDF8554J amplifier can be used as a line driver or as a low gain amplifier. In both
situations, the gain needs to be set to 16 dB via I2C-bus (IB3[D5:D6]) and can be
independently set for front channels (1 and 3) and rear channels (2 and 4). The main
difference between the line driver mode and low gain mode is the DC-output voltage.
In line driver mode the TDF8554J can be used to drive a separate amplifier or booster. In
this mode the DC output voltage is set to 0.23
battery voltage and is filtered with the
capacitor connected to pin SVR (VSVR). The reason to not set the DC output voltage to
half the battery voltage is to allow engine starts at a battery voltage as low as 6 V. The DC
output voltage remains approximately 3 V during engine start. If the DC output voltage is
set to half the battery voltage, with an engine start the common mode voltage will change
quickly from 7 V to 3 V. This drives the input stage of the booster below the ground level.
If the TDF8554J amplifier is used as a low gain amplifier in a booster, the DC output
voltage is set to half of the supply voltage to ensure maximum undistorted output power.
The line driver and low gain modes can be selected with I2C-bus IB4[D4].
Fig 13. AC-load impedance as a function of peak output voltage (low current AC-load
detection)
001aam702
VoM (V)
06
4
2
20
30
10
40
50
ZL
(W)
0
load detected,
l2C-bus bits set
no load detected,
l2C-bus bits not set
trip level
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