TDA1596T ,IF amplifier/demodulator for FM radio receiversFeatures• Simulates behaviour of a ratio detector (internal field strength and detuning-dependent v ..
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TDA1596T
IF amplifier/demodulator for FM radio receivers
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
GENERAL DESCRIPTIONThe TDA1596T provides IF amplification, symmetrical quadrature demodulation and level detection for quality home and
car FM radio receivers and is suitable for both mono and stereo reception. It may also be applied to common front-ends,
stereo decoders and AM receiver circuits.
Features Simulates behaviour of a ratio detector (internal field strength and detuning-dependent voltage for dynamic AF signal
muting) Mono/stereo blend and field strength indication control voltage Three-state mode switch for FM, mute-on / FM, mute-off / FM-off Internal compensation of AF signal total harmonic distortion (THD) Two open collector stop pulse outputs for microcomputer tuning control (can be one stop pulse output by
wired-ANDing) Internal reference voltage source Built-in hum and ripple rejection circuits.
QUICK REFERENCE DATA
SEE ALSO DATA SHEET FOR TDA1596
PACKAGE OUTLINE20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 12.
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
PINNING1VP supply voltage LVA level voltage adjustment ULV unweighted level output/K2 adjustment AF0 AF output
5Vref reference voltage output WLV weighted level voltage output MSW mode switch DDV detune detector voltage n.c. not connected DMI1 demodulator input 1 DMI2 demodulator input 2 n.c. not connected TSW tau switch ST1 stop pulse output 1 ST0 stop pulse output 0 MTV mute voltage GND ground LFD1 IF limiter feedback 1 LFD2 IF limiter feedback 2 IFI IF input
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
FUNCTIONAL DESCRIPTION
Limiter-amplifierThis has five stages of IF amplification using balanced differential limiter-amplifiers with emitter--follower coupling.
Decoupling of the stages from the voltage supply lines and an internal high-ohmic DC feed-back loop give a very stable
IF performance. The amplifier gain is virtually independent from temperature changes.
FM demodulatorThe demodulator is fully balanced and comprises two cross-coupled differential amplifiers. Quadrature detection of the
FM signal is performed by feeding one differential amplifier directly from the limiter--amplifier output, and the other via an
external 90° phase-shifting network. The demodulator has good stability and its zero cross-over shift is small. The
bandwidth of the demodulator output is restricted to approximately 1 MHz by an internal low-pass filter.
THD compensationThis circuit compensates non-linearities introduced by demodulation. For this to operate correctly the demodulator 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 THD, instead the adjustment criterium is for a symmetrical stop pulse.
Mute attenuator and AF outputThe control voltage for the mute attenuator at pin 16 is generated from the values of the level detector and the detuning
detector outputs. The mute attenuator has a fast attack and a slow decay which is determined by the capacitor at pin 16.
The AF signal is passed via the mute attenuator to the output at pin 4.
A weighted control voltage, available from pin 6, is obtained from the mute attenuator control voltage via a buffer-amplifier
which introduces an additional voltage shift and gain.
Level detectorThe level detector generates a voltage output which is proportional to the field strength of the input signal. The
unweighted level detector output is available when the mode switch is operating in the FM, mute-on condition.
Tuning-stop outputsThe open collector outputs STOP-0 and STOP-1 (from pins 15 and 14 respectively) are voltages derived from the
detuning level and the field strength of the input signal. If only one tuning-stop output is required, pins 14 and 15 may be
tied together.
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
RATINGSLimiting values in accordance with the Absolute Maximum System (IEC 134)
Note Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
THERMAL RESISTANCEFrom junction to ambient (in free air) Rth j-a (max.) = 95 K/W
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
CHARACTERISTICSf = 10.7 MHz; VP = V1-17 = 8.5 V; VI = V20 (rms) = 1 mV; Tamb = 25 °C; measured in the circuit of Fig.3; tuned circuit at pins
10, 11 aligned for symmetrical stop pulses; all voltages are referred to ground (pin 17), unless otherwise specified
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
* Connecting pin 13 to ground is only allowed for measuring the current at pin 16. It is not for use in application.
* Without input voltage.
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
OPERATING CHARACTERISTICSf = 10.7 MHz; VI = V20(rms) = 1 mV; deviation (Δf) = 22.5 kHz; modulation frequency (fm) = 400 Hz; de-emphasiss (pin 4)
= 50 μs; test circuit as per Fig.3; tuned circuit (QL = 19) aligned for symmetrical stop pulses; Tamb=+25 °C; unless
otherwise specified
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
