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TDA9881TS Datenblatt(PDF) 11 Page - NXP Semiconductors

Teilenummer TDA9881TS
Bauteilbeschribung  Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards
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© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2004
11 of 42
Philips Semiconductors
TDA9881
Alignment-free vision and FM sound IF PLL demodulator
8.13 Audio amplifier and mute time constant
The audio amplifier consists of two parts:
AF preamplifier
AF output amplifier.
The AF preamplifier used for FM sound is an operational amplifier with internal feedback,
high gain and high common mode rejection. The AF voltage from the PLL demodulator is
5 mV (RMS) for a frequency deviation of 27 kHz and is amplified by 30 dB. By using a
DC operating point control circuit (with external capacitor CAF), the AF preamplifier is
decoupled from the PLL DC voltage. The low-pass characteristic of the amplifier reduces
the harmonics of the sound intercarrier signal at the AF output terminal.
For FM sound a switchable de-emphasis network (with external capacitor) is implemented
between the preamplifier and the output amplifier. The de-emphasis time constant with
50
µs or 75 µs depends on the FM carrier selection via pins FM0 and FM1; see Table 5.
The AF output amplifier provides the required AF output level by a rail-to-rail output stage.
A preceding stage makes use of an input selector for switching between the FM sound
and mute state.
Switching to the mute state is controlled automatically, depending on the digital acquisition
help circuit should the VCO of the FM PLL not be in the required frequency window. This
is done by a time constant: fast for switching to the mute state and slow (typically 40 ms)
for switching to the non-mute state.
Auto mute can be disabled via pin AMUTE0; see Table 6.
8.14 Internal voltage stabilizer
The band gap circuit internally generates a voltage of approximately 2.4 V, independent of
the supply voltage and the temperature. A voltage regulator circuit, connected to this
voltage, produces a constant voltage of 3.55 V which is used as an internal reference
voltage.
8.15 Logic
The logic circuit detects the logic level at the logic ports VIF0, QSSO, FM0, FM1 and
AMUTE0 and controls the internal functions; see Table 4 to Table 6. In the event that all
logic ports are open-circuit (high-ohmic or CMOS HIGH level) TV standard NTSC with a
vision carrier frequency of 45.75 MHz, an FM sound carrier frequency of 4.5 MHz,
de-emphasis with 75
µs time constant and auto mute on is selected.
Table 4:
VIF frequency selection
QSSO
VIF0
VIF frequency (MHz)
No resistor at pin
pin open-circuit
45.75
No resistor at pin
pin connected to ground
38.9
2.2 k
Ω resistor to ground at pin pin open-circuit
58.75
2.2 k
Ω resistor to ground at pin pin connected to ground
38.0


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