TDA1599 CNV, ELEKTRONIKA, ELEKTRONIKA MIESZANA
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INTEGRATED CIRCUITS
DATA SHEET
TDA1599
IF amplifier/demodulator for FM
radio receivers
May 1994
Product specification
File under Integrated Circuits, IC01
Philips Semiconductors
Product specification
IF amplifier/demodulator for FM radio
receivers
TDA1599
FEATURES
GENERAL DESCRIPTION
·
Balanced limiting amplifier
The TDA1599 provides IF amplification, symmetrical
quadrature demodulation and level detection for quality
home and car FM radio receivers and is suitable for mono
and stereo reception. It may also be applied to common
front ends, stereo decoders and AM receiver circuits.
·
Balanced coincidence demodulator
Two open-collector stop pulse outputs for
microcomputer tuning control
·
·
Simulated behaviour of a ratio detector (internal field
strength and detuning dependent voltage for dynamic
AF signal muting)
·
Mono/stereo blend field strength indication control
voltage
·
AFC output
·
3-state mode switch for FM-MUTE-ON, FM-MUTE-OFF
and FM-OFF
·
Internal compensation of AF signal total harmonic
distortion (THD)
·
Built-in hum and ripple rejection circuits.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
P
positive supply voltage (pin 1)
7.5
8.5
12
V
I
P
supply current (I
2
= I
7
= 0)
-
20
26
mA
V
i
IF input sensitivity for limiting on pin 20 (RMS value)
14
22
35
m
V
V
o
AF output signal on pin 4 (RMS value)
180
200
220
mV
S/N
signal-to-noise ratio (f
m
= 400 Hz;
D
f =
±
75 kHz)
-
82
-
dB
THD
total harmonic distortion (f
m
= 1 kHz;
D
f =
±
75 kHz)
-
0.1
0.3
%
with K2 adjustment and FM-MUTE-OFF
-
0.07
0.25
%
T
amb
operating ambient temperature
-
40
-
+85
°
C
All pin numbers mentioned in this data sheet refer to the SO-version (TDA1599T) unless otherwise specified.
ORDERING INFORMATION
PACKAGE
EXTENDED
TYPE NUMBER
PINS
PIN POSITION
MATERIAL
CODE
SOT102
(1)
TDA1599
18
DIL
plastic
TDA1599T
20
mini-pack
plastic
SOT163A
(2)
Notes
1.
SOT102-1; 1996 August 29.
2.
SOT163-1; 1996 August 29.
May 1994
2
(1)
to connect pin 13 (11) to ground is only allowed to measure the current on pin 16 (14)
(2)
FM-MUTE-OFF
(3)
FM-OFF
(4)
FM-MUTE-ON
Fig.1 Block diagram and application circuit (TDA1599 pinning in parenthesis).
Philips Semiconductors
Product specification
IF amplifier/demodulator for FM radio
receivers
TDA1599
PINNING;
note 1
SYMBOL
PIN
DESCRIPTION
V
P
1 (1)
supply voltage (+8.5 V)
LVA
2 (2)
level adjustment for stop condition
ULV
3 (3)
unweighted level output / K2 adjustment
V
oAF
4 (4)
audio frequency output (MPX signal)
V
REF
5 (5)
reference voltage output
WLV
6 (6)
weighted level output
MODE
7 (7)
mode switch input
DDV
8 (8)
detune detector voltage
n.c.
9 (
-
)
not connected
DEMI1
10 (9)
demodulator input 1
DEMI2
11 (10)
demodulator input 2
n.c.
12 (
-
)
not connected
TSW
13 (11)
tau switch input
ST1
14 (12)
STOP-1, stop pulse output 1
ST0
15 (13)
STOP-0, stop pulse output 0
MUTE
16 (14)
muting voltage
GND
17 (15)
ground (0 V)
LFB1
18 (16)
IF limiter feedback 1
LFB2
19 (17)
IF limiter feedback 2
V
iIF
20 (18)
IF signal input
Note
1.
SO-version TDA1599T; pinning for DIL-version in parenthesis.
Fig.2 Pin configuration for DIL-version.
Fig.3 Pin configuration for SO-version.
May 1994
4
Philips Semiconductors
Product specification
IF amplifier/demodulator for FM radio
receivers
TDA1599
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.
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 on 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.
The level detector generates a voltage output signal
proportional to the amplitude of the input signal. The
unweighted level detector output signal is available in
FM-MUTE-ON condition (mode switch).
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.
May 1994
5
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