TDA1593 データシートの表示（PDF） - Philips Electronics
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TDA1593 Datasheet PDF : 20 Pages
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Philips Semiconductors
IF amplifier/demodulator for
FM car radio receivers
Product specification
TDA1593
VP 1
LVA 2
18 ViIF
17 LFB2
ULV 3
16 LFB1
VoAF 4
Vref 5
15 GND
TDA1593 14 MUTE
WLV 6
13 ST0
n.c. 7
12 ST1
DDV 8
11 TSW
DEMI1 9
10 DEMI2
MBE513
VP 1
LVA 2
20 ViIF
19 LFB2
ULV 3
18 LFB1
VoAF 4
17 GND
Vref 5
16 MUTE
TDA1593T
WLV 6
15 ST0
n.c. 7
14 ST1
DDV 8
13 TSW
n.c. 9
12 n.c.
DEMI1 10
11 DEMI2
MBE514
Fig.2 Pin configuration for DIP-version.
Fig.3 Pin configuration for SO-version.
FUNCTIONAL DESCRIPTION
The limiter amplifier has five stages of IF amplification
using balanced differential limiter amplifiers with emitter
follower coupling.
Decoupling of the stages from the supply voltage line and
an internal high-ohmic DC feedback loop give a very stable
IF performance. The amplifier gain is virtually independent
of changes in temperature.
The FM demodulator is fully balanced and compromises
two cross-coupled differential amplifiers.
The quadrature detection of the FM signal is performed by
direct feeding of one differential amplifier from the limiter
amplifier output, and the other via an external 90 degrees
phase shifting network. The demodulator has a good
stability and a small zero-cross-over shift. The bandwidth
of the demodulator output is restricted by an internal
low-pass filter to approximately 1 MHz. Non-linearities,
which are introduced by demodulation, are compensated
by the THD compensation circuit. For this reason, the
demodulator resonance circuit (between pins 10 and 11)
must have a loaded Q-factor of 19. Consequently, there is
no need for the demodulator tuned circuit to be adjusted
for minimum distortion. Adjustment criterion is a
symmetrical stop pulse. The control voltage for the mute
attenuator (pin 16) is derived from the values of the level
detector and the detuning detector output signals.
The mute attenuator has a fast attack and a slow decay
determined by the capacitor on pin 16. The AF signal is fed
via the mute attenuator to the output (pin 4). A weighted
control voltage (pin 6) is obtained from the mute attenuator
control voltage via a buffer amplifier that introduces an
additional voltage shift and gain.
The level detector generates a voltage output signal
proportional to the amplitude of the input signal.
The unweighted level detector output signal is available.
The open-collector tuning stop output voltages STOP-0
and STOP-1 (pins 15 and 14) are derived from the
detuning and the input signal level. The pins 14 and 15
may be tied together, if only one tuning-stop output is
required.
1996 Oct 10
5
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