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參數(shù)資料
| 型號： | TA2069AF |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO24 |
| 封裝： | 0.300 INCH, 1 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 298K |
| 代理商： | TA2069AF |
TDA9885_TDA9886_3
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 16 December 2008
8 of 56
NXP Semiconductors
TDA9885; TDA9886
I2C-bus controlled multistandard alignment-free IF-PLL demodulators
8.
Functional description
Figure 1 shows the simplied block diagram of the device which comprises the following
functional blocks:
VIF amplier
Tuner AGC and VIF AGC
VIF-AGC detector
Frequency Phase-Locked Loop (FPLL) detector
VCO and divider
AFC and digital acquisition help
Video demodulator and amplier
Sound carrier trap
SIF amplier
SIF-AGC detector
Single reference QSS mixer
AM demodulator
FM demodulator and acquisition help
Audio amplier and mute time constant
Internal voltage stabilizer
I2C-bus transceiver and MAD
8.1 VIF amplier
The VIF amplier consists of three AC-coupled differential stages. Gain control is
performed by emitter degeneration and collector resistor variation. The total gain control
range is typically 66 dB. The differential input impedance is typically 2 k
in parallel with
3pF.
8.2 Tuner AGC and VIF AGC
This block adapts the voltage, generated at the VIF-AGC detector, to the internal signal
processing at the VIF amplier and performs the tuner AGC control current generation.
The onset of the tuner AGC control current generation can be set either via the I2C-bus
information cannot be stored, related to the device). The presence of a potentiometer is
automatically detected and the I2C-bus setting is disabled.
Furthermore, derived from the AGC detector voltage, a comparator is used to detect if the
corresponding VIF input voltage is higher than 200
V. This information can be read out
via the I2C-bus (bit VIFLEV = 1).
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