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TDA1593 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. TDA1593
Description  IF amplifier/demodulator for FM car radio receivers
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA1593 Datasheet(HTML) 5 Page - NXP Semiconductors

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1996 Oct 10
5
Philips Semiconductors
Product specification
IF amplifier/demodulator for
FM car radio receivers
TDA1593
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.
TDA1593
MBE513
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
VP
LVA
ULV
Vref
VoAF
WLV
DDV
DEMI1
DEMI2
TSW
ST0
ST1
MUTE
LFB1
GND
ViIF
LFB2
n.c.
Fig.2 Pin configuration for DIP-version.
TDA1593T
MBE514
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VP
LVA
ULV
Vref
VoAF
WLV
DDV
n.c.
n.c.
DEMI1
DEMI2
TSW
ST0
ST1
MUTE
LFB1
GND
ViIF
LFB2
n.c.
Fig.3 Pin configuration for SO-version.


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