Philips TDA1599T, TDA1599 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA1599

IF amplifier/demodulator for FM radio receivers

Product speciﬁcation File under Integrated Circuits, IC01

May 1994

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers

FEATURES

• Balanced limiting amplifier

• 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

TDA1599

GENERAL DESCRIPTION

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.

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

S/N signal-to-noise ratio (f THD total harmonic distortion (f

positive supply voltage (pin 1) 7.5 8.5 12 V supply current (I2= I7= 0) − 20 26 mA IF input sensitivity for limiting on pin 20 (RMS value) 14 22 35 µV AF output signal on pin 4 (RMS value) 180 200 220 mV

= 400 Hz; ∆f = ±75 kHz) − 82 − dB

= 1 kHz; ∆f = ±75 kHz) − 0.1 0.3 %

with K2 adjustment and FM-MUTE-OFF − 0.07 0.25 %

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

EXTENDED

TYPE NUMBER

PINS PIN POSITION MATERIAL CODE

PACKAGE

TDA1599 18 DIL plastic SOT102 TDA1599T 20 mini-pack plastic SOT163A

Notes

1. SOT102-1; 1996 August 29.

2. SOT163-1; 1996 August 29.

(1)

(2)

May 1994 2

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers

TDA1599

May 1994 3

Fig.1 Block diagram and application circuit (TDA1599 pinning in parenthesis).

(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

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers

PINNING; note 1

SYMBOL PIN DESCRIPTION

LVA 2 (2) level adjustment for stop condition ULV 3 (3) unweighted level output / K2 adjustment V

oAF

REF

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

1 (1) supply voltage (+8.5 V)

4 (4) audio frequency output (MPX signal) 5 (5) reference voltage output

20 (18) IF signal input

TDA1599

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

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.

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.

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

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

TDA1599

receivers

LIMITING VALUES (TDA1599T PINNING)

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER MIN. MAX. UNIT

14, 15

tot

stg

amb

ESD

supply voltage (pin 1) −0.3 +13 V voltage at pins 2, 4, 5, 6, 10, 11 and 16 −0.3 +10 V voltage at pins 7, 3, 8, 14, 15, 18, 19 and 20 −0.3 V

voltage on pin 13 − 6V current at pins 14 and 15 − 2mA total power dissipation − 360 mW storage temperature −55 +150 °C operating ambient temperature −40 +85 °C electrostatic handling; note 1

all pins except 5 and 7 −±2000 V pin 5 − +800 V

−2000 V

pin 7 − +1000 V

−2000 V

Note to the limiting values

1. Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.

THERMAL RESISTANCE

SYMBOL PARAMETER THERMAL RESISTANCE

th j-a

from junction to ambient in free air

SOT102 80 K/W SOT163A 90 K/W

May 1994 6

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

TDA1599

receivers

CHARACTERISTICS (TDA1599T PINNING)

= 8.5 V; T

at pin 20; de-emphasis of 50 µs; tuned circuit at pins 10 and 11 aligned for symmetrical stop pulses; measurements taken in Fig.4 unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Mode switch input

IF ampliﬁer and demodulator

= +25 °C; FM-MUTE-ON (I7= 0); fIF= 10.7 MHz; deviation ±22.5 kHz with fm= 400 Hz; Vi= 10 mV RMS

amb

positive supply voltage (pin 1) 7.5 8.5 12 V supply current I2= I7= 0 − 20 26 mA

input current for FM-MUTE-ON − 0 − mA input voltage for FM-MUTE-ON 2.4 2.8 3.2 V input voltage for FM-MUTE-OFF 0.9V

−− V

REF

input voltage for FM-OFF AF attenuation > 60 dB −−1.4 V

demodulator input impedance

25 40 55 kΩ

between pins 10 and 11 demodulator input capacitance

− 6 − pF

between pins 10 and 11

AF output (pin 4)

1000

output resistance − 400 −Ω DC output level V power supply ripple rejection on pin 4 f = 1000 Hz;

≤ 5 µV RMS on pin 20 2.75 3.1 3.45 V

iIF

33 36 − dB

=50mVRMS

ripple

Tuning stop detector

∆f detuning frequency for STOP-0 on pin 15; Fig.11

≥ 3.5 V −−+14.0 kHz

for V

≤ 0.3 V +22.0 −− kHz

for V

∆f detuning frequency for STOP-1 on pin 14; Fig.10

≥ 3.5 V −−−14.0 kHz

for V

≤ 0.3 V −22.0 −− kHz

for V

14, 15

dependence on input voltage for STOP-0 and STOP-1 (RMS value)

output voltage I

Fig.9;

≥ 3.5 V 250 −− µV

14, 15

≤ 0.3 V −−50 µV

14, 15

= 1 mA −−0.3 V

14, 15

Reference voltage source (pin 5)

V R

REF

reference output voltage I5= −1 mA 3.3 3.7 4.1 V output resistance I5= −1 mA − 40 80 Ω

TC temperature coefﬁcient − 3.3 − mV/VK

May 1994 7

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