Philips TDA1596T Manuale utente

DATA SHEET

Product speciﬁcation

File under Integrated Circuits, IC01 April 1991

INTEGRATED CIRCUITS

TDA1596T

IF amplifier/demodulator for FM

radio receivers

April 1991 2

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

GENERAL DESCRIPTION

The 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 OUTLINE

20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 12.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

VPSupply voltage (pin 1) 7.5 8.5 12.0 V

IPSupply current (pin 1) VP= 8.5 V; I2= I7= 0 mA −20 26 mA

V4(rms) AF output voltage (RMS value) V20(rms) = 10 mV 180 200 220 mV

S/N Signal-to-noise ratio V20(rms) = 10 mV; fm= 400 Hz;

∆f = 75 kHz −82 −dB

THD Total harmonic distortion V20(rms) = 10 mV; fm= 1 kHz;

I7= 0 mA; ∆f = 75 kHz; FM mute

on; without de-emphasis;

without detuning

−0.1 0.3 %

Tamb Operating ambient temperature

range −40 −+85 °C

April 1991 3

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

Fig.1 Block diagram and application circuit.

(1) Connecting pin 13 to ground is only allowed for measuring the current at pin 16. It is not for use in application.

(2) In the FM, mute-on condition the unweighted level detector output is available from pin 3. In the FM, mute-off condition the variable resistor at pin 3 can be adjusted for

minimum 2nd harmonic distortion at pin 4.

April 1991 4

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

PINNING

Psupply voltage

2 LVA level voltage adjustment

3 ULV unweighted level output/K2 adjustment

4 AF0 AF output

ref reference voltage output

6 WLV weighted level voltage output

7 MSW mode switch

8 DDV detune detector voltage

9 n.c. not connected

10 DMI1 demodulator input 1

11 DMI2 demodulator input 2

12 n.c. not connected

13 TSW tau switch

14 ST1 stop pulse output 1

15 ST0 stop pulse output 0

16 MTV mute voltage

17 GND ground

18 LFD1 IF limiter feedback 1

19 LFD2 IF limiter feedback 2

20 IFI IF input Fig.2 Pinning diagram.

April 1991 5

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

FUNCTIONAL DESCRIPTION

Limiter-ampliﬁer

This 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 demodulator

The 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 compensation

This 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 output

The 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.

Aweightedcontrolvoltage,availablefrompin6,isobtainedfromthemuteattenuatorcontrolvoltageviaabuffer-amplifier

which introduces an additional voltage shift and gain.

Level detector

The 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 outputs

The 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.

April 1991 6

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

RATINGS

Limiting values in accordance with the Absolute Maximum System (IEC 134)

Note

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

THERMAL RESISTANCE

SYMBOL PARAMETER MIN. MAX. UNIT

VP= V1-17 Supply voltage (pin 1) −0.3 +16 V

V5-17 Reference voltage range (pin 5) −0.3 +10 V

V2-17 Level adjustment range (pin 2) −0.3 +10 V

V7-17 Mode switch voltage range (pin 7) −0.3 VPV

V13-17 Control input voltage range (pin 13) −+6V

THD compensation/unweighted ﬁeld

V3-17 strength voltage range (pin 3) −0.3 VPV

Tuning-stop output voltage range

V15-17 STOP-0 (pin 15) −0.3 VPV

V14-17 STOP-1 (pin 14) −0.3 VPV

Tuning-stop output current

I15 STOP-0 (pin 15) −2mA

14 STOP-1 (pin 14) −2mA

stg Storage temperature range −55 +150 °C

Tamb Operating ambient temperature range −40 +85 °C

Electrostatic handling(1)

Ves all pins except pins 5 and 6 −2000 +2000 V

Ves pin 5 −2000 +900 V

Ves pin 6 −2000 +1600 V

From junction to ambient (in free air) Rth j-a (max.) = 95 K/W

April 1991 7

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

CHARACTERISTICS

f = 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

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

Supplies

VP= V1Supply voltage 7.5 8.5 12.0 V

I1Supply current at I2= I7= 0 mA −20 26 mA

FM demodulator

R10-11 Input impedance 25 40 55 kΩ

C10-11 −6−pF

V4DC output voltage (no-signal condition) at

V10, 11(p-p) ≤100 µV; V20(rms) ≤5µV2.75 3.10 3.45 V

R4-17 Output impedance −400 −Ω

Mute attenuator control voltage

Control voltage (pin 16)

V16 at V20(rms) ≤5µV−2.0 −V

V16 at V20(rms) = 1 mV −3.45 −V

R10-17 Output impedance (pin 16) −−2.0 MΩ

V2Level shift input (pin 2) internal bias voltage at

I2= 0 mA −1.4 −V

R2-17 input impedance 15 −−kΩ

Internal muting (Fig.6)

Internal attenuation of signals

±22.5 kHz ≤detuning ≤ ±80 kHz;

A = 20log[∆V4(FM mute-off)/∆V4(FM)]

A at V16 ≥1 V5−0−dB

A at V16 = 0.77 V51.5 3.0 4.5 dB

A at V16 = 0.55 V5−20 −dB

April 1991 8

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

Attack and decay (pin 16)

Pin 13 connected to ground *

+I16 charge current −8−µA

−I

16 discharge current −120 −µA

Pin 13 connected to Vref

+I16 charge current −100 −µA

−I

16 discharge current −120 −µA

Level detector

Dependence of output voltage on temperature −3.3 −mV/VK

R6Output impedance −−500 Ω

Dependence of output voltage (pin 6) on input voltage

(pin 20) (Fig.7):

V6V20(rms) ≤5 µV; I2= I7= 0 mA 0.1 0.7 1.3 V

V6V20(rms) = 1 mV; I2= I7= 0 mA 3.0 3.6 4.2 V

Slope of output voltage (pin 6) for input voltage range

V20(rms) ≥50 µV to V20(rms) ≤50 mV 1.4 1.7 2.0 V/20 dB

Dependence of output voltage (pin 6) on detuning

(Fig.8) at input voltage V20(rms) = 10 mV:

∆V6detuning = ≤ ±45 kHz −−0.2 V

±∆f detuning for V6= 1.8 V 90 −160 kHz

V6detuning = ±200 kHz 0.5 0.7 0.9 V

|∆V6/∆f| Slope of output voltage with detuning = 125 ±20 kHz

at V20(rms) = 10 mV −35 −mV/kHz

Level shift control (pin 2) (Fig.9)

±∆V6adjustment range 1.6 2.0 −V

−(∆V6/∆V2) adjustment gain −1.7 −V

V6output voltage at V2= V5; V20(rms) ≤5 µV−−0.3 V

Low-pass ﬁlter at pin 8

Output voltage at I7= 0 mA;

V8V20(rms) ≤5 µV−2.2 −V

R8(int) Internal resistance 12 25 50 kΩ

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

∆

V6T∆

--------------

∆

20 V20

log∆

----------------------------

April 1991 9

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.

Tuning-stop detector (Figs 10 and 11)

Stop-0: detuning at V20(rms) = 10 mV

+∆f for V15 ≥3.5 V −−10 kHz

+∆f for V15 ≤0.3 V 18 −−kHz

Stop-1: detuning at V20(rms) = 10 mV

−∆f for V14 ≥3.5 V −−10 kHz

−∆f for V14 ≤0.3 V 18 −−kHz

Dependence of STOP-0, STOP-1 on

input voltage (pin 20)

input voltage (RMS value) for

V20(rms) V14 = V15 ≥3.5 V 250 −−µV

input voltage (RMS value) for

V20(rms) V14 = V15 ≤0.3 V −−50 µV

Output voltage when

V14, 15 I14 = I15 = 1 mA −−0.3 V

Mode switch and pin 3 (Fig.12)

FM-off position

Control voltage for 60 dB

V7muting depth −−1.4 V

FM, mute-on position (pin 3 = output)

Internal bias voltage at

V7R7-17 ≥10 MΩ−2.8 −V

|I7| Input current −−2.5 µA

Output voltage with

V3R3-17 = 10 kΩ; C3-17 ≥1 nF* −2−V

Output impedance for V20 =≤5µV;

R3-17 I3= 500µA−−100 Ω

FM, mute-off position (pin 3 = input)

V7Control voltage 0.9 V5−−V

7Input current at V7= V5−−15 µA

R3-17 Input resistance 1 −−MΩ

Reference voltage source

V5Output voltage at I5=−1 mA 3.3 3.7 4.1 V

∆V5/I5Output impedance at I5=−1 mA −40 80 Ω

TC Temperature coefﬁcient −3.3 −mV/K

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

April 1991 10

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio

receivers TDA1596T

OPERATING CHARACTERISTICS

f = 10.7 MHz; VI= V20(rms) = 1 mV; deviation (∆f) = 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

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V4(rms) AF output voltage (RMS value) at

V20(rms) = 10 mV 180 200 220 mV

V20(rms) Start of limiting (FM, mute-off); (RMS value)

(Fig.13) 14 22 35 µV

Dependence of signal-to-noise ratio (in noise

frequency band 250 Hz to 15 kHz, unweighted)

on input voltage

V18(rms) for S/N = 26 dB −15 −µV

18(rms) for S/N = 46 dB −60 −µV

S/N at V20(rms) = 10 mV; ∆f = 75 kHz −82 −dB

THD THD (FM, mute-on) at V20(rms) = 10 mV; ∆f = 75

kHz; fm= 1 kHz; without detuning; without

de-emphasis; I7= 0 mA

−0.1 0.3 %

αDDynamic mute attenuation (Fig.14) −16 −dB

with fm= 100 kHz; ∆f = 75 kHz

αD∆f Slope of attenuation curve −0.8 −dB/kHz

THD (FM, mute-on) at V20(rms) = 10 mV;

∆f = 75 kHz; fm= 1 kHz;

detuning ≤± 25 kHz without

THD de-emphasis; I7= 0 mA (Fig.15) −−0.6 %

THD (FM, mute-off and compensated via

pin 3) at V20(rms) = 10 mV;

∆f = 75 kHz; fm= 1 kHz;

THD V7= V5−0.07 0.25 %

V3Voltage range at pin 3 for THD compensation 0 −V5V

AM suppression (FM, mute-off) with amplitude

modulation at 30% input voltage range

V20 = 300 µV to 100 mV (Fig.16)

−65 −dB

Power supply ripple rejection = 20log [∆V1/∆V4]33 36 −dB

Mute attenuation (FM-off)

= 20log [V4(FM-on/V4(FM-off)]60 −−dB

αD20 V4FM mute off )–(

V4FM mute,(on )–

---------------------------------------------------------log=

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