Philips TDA1576T Manuale utente

DATA SHEET

Product speciﬁcation

Supersedes data of February 1991

File under Integrated Circuits, IC01

1998 Nov 18

INTEGRATED CIRCUITS

TDA1576T

FM/IF amplifier/demodulator circuit

1998 Nov 18 2

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

FEATURES

•Fully balanced 4-stage limiting IF amplifier

•Symmetrical quadrature demodulator

•Field strength indication output for 1 mA ammeter

•Detune detector for side response and noise attenuation

•Detune voltage output

•Internal muting circuit

•0°and 180°AF output signals

•Reference voltage output

•Electronic smoothing of the supply voltage.

GENERAL DESCRIPTION

The TDA1576T is a monolithic integrated FM/IF amplifier

circuit for use in mono and stereo FM-receivers of car

radios or home sets.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

VPsupply voltage (pin 1) 7.5 8.5 15 V

IPsupply current 10 16 23 mA

ViIF(rms) input sensitivity (RMS value) −3 dB before limiting 14 22 35 µV

S/N = 26 dB −10 −µV

S/N = 46 dB −55 −µV

oAF(rms) AF output voltage (RMS value) 60 67 75 mV

THD total harmonic distortion with double

resonant circuits −0.02 −%

S/N signal-to-noise ratio Vi>1mV −72 −dB

αAM AM suppression −50 −dB

RR ripple rejection f = 100 Hz 43 48 −dB

I15 maximum indicator output current −−2mA

amb operating ambient temperature −30 −+80 °C

TYPE

NUMBER PACKAGE

NAME DESCRIPTION VERSION

TDA1576T SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1

1998 Nov 18 3

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

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BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MEH139

DETUNE

DETECTOR

0.5

3.7 kΩ

8.3 kΩ

560 pF

33 pF

QL= 20

fo= 10.7 MHz

33 pF 6.8 nF

audio

outputs

10 Ω

0.1 µF 47 µF

3.7 kΩ

MUTE

ATTENUATOR

QUADRATURE

DEMODULATOR

RES1IF1CPS

V1 V2

RES2 IF2 VoAF1

VAF −VAF

VoAF2 n.c.

1098

Vi(det)

n.c.

Vo(det)

Vref

VF0

ViIF

VFB2

VFB1

0.1 µF0.1 µF

ViIF

GND

2 V (RMS)

20 19

7654321 FMON

REFERENCE

VOLTAGE

reference

voltage

detune

voltage

zero adjustment

field strength

indicator

field strength

LEVEL DETECTOR

4-STAGE

LIMITER/

AMPLIFIER

+4.9 V

+8.5 V

3.6 kΩ

kΩ

1 nF 0.47 µF

1 mA

TDA1576T

1998 Nov 18 4

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

PINNING

SYMBOL PIN DESCRIPTION

VP1 positive supply voltage

CPS 2 smoothing capacitor of power supply

IF1 3 IF signal to resonant circuit

RES1 4 resonant circuit input 1

FMON 5 FM-ON, standby switch

RES2 6 resonant circuit input 2

IF2 7 IF signal to resonant circuit

VoAF1 8 AF output voltage 1 (0°phase)

VoAF2 9 AF output voltage 2 (180°phase)

n.c. 10 not connected

n.c. 11 not connected

Vi(det) 12 detune detector input voltage for

external audio reference

Vo(det) 13 detune detector output voltage

Vref 14 reference voltage output

VF15 level output for field strength

VF0 16 zero adjust voltage for ﬁeld strength

ViIF 17 FM/IF input signal voltage

VFB2 18 DC feedback 2

VFB1 19 DC feedback 1

GND 20 ground (0 V) Fig.2 Pin configuration.

handbook, halfpage

TDA1576T

MEH140

CPS

IF1

RES1

FMON

RES2

IF2

n.c. n.c.

Vi(det)

Vo(det)

Vref

VFB2

VFB1

GND

VF0

ViIF

VoAF1

VoAF2

1998 Nov 18 5

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

LIMITING VALUES

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

THERMAL CHARACTERISTICS

SYMBOL PARAMETER MIN. MAX. UNIT

VPsupply voltage (pin 1) 0 15 V

V2, 5, 16 voltage on pins 2, 5 and 16 0 VPV

Ptot total power dissipation 0 450 mW

Tstg storage temperature −55 +150 °C

Tamb operating ambient temperature −30 +80 °C

SYMBOL PARAMETER VALUE UNIT

Rth j-a thermal resistance from junction to ambient in free air 85 K/W

1998 Nov 18 6

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

CHARACTERISTICS

VP= 8.5 V; fIF = 10.7 MHz; RS=60Ω; fm= 400 Hz with ∆f=±22.5 kHz; 50 µs de-emphasis (C8-9 = 6.8 nF);

Tamb =25°C and measurements taken in Fig.1; unless otherwise speciﬁed. The demodulator circuit is adjusted at

minimum second harmonic distortion for ViIF = 1 mV and a deviation ∆f=±75 kHz.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

VPsupply voltage (pin 1) 7.5 8.5 15 V

IPsupply current V5=V

9=V

13 = 0 10 16 23 mA

Reference voltage

Vref reference voltage (pin 14) I14 =−1mA −4.9 −V

∆Vref reference voltage dependence on

temperature −0.3 −%/K

I14 maximum output current short-circuit current 4 6 7.5 mA

R14 output resistor I14 < 1.2 mA −60 150 Ω

IF ampliﬁer

ViIF(rms) input sensitivity (RMS value; pin 17) −3 dB before limiting 14 22 35 µV

R17-18 input resistance ViIF = 200 mV (RMS) 10 −−kΩ

17-18 input capacitance ViIF = 200 mV (RMS) −5−pF

VoIF(p-p) output voltage at pins 3 and 7

(peak-to-peak value) Z3, 7 = 10 pF parallel to

1MΩ610 680 750 mV

R3-7 output resistance 200 250 300 Ω

Demodulator

R4-6 input resistance 20 30 40 kΩ

C4-6 input capacitance −1 2.5 pF

R8, 9 output resistance 2.9 3.7 4.5 kΩ

V8, 9 DC offset voltage on output pins at

V4-6 =0 V

5> 3 V or V3-7 = 0 or

V13 < 0.3 V −0±100 mV

demodulator efﬁciency −40 −mV/°

demodulator efﬁciency dependent on

supply voltage −6.2 −mV/°

V/V DC voltage ratio 0.653 0.667 0.680 V/V

dependence on temperature −10−5−1/K

V14

∆

V14 T∆×

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

V14

∆I14

∆

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

V∆ϕ∆

------- V8-9

∆ϕ∆

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

V8-9

ϕ∆ VP3VBE

–()

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

V8V9

2V2

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

V∆T∆

------- V8V9

2V2

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

∆

T∆

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

1998 Nov 18 7

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

Field strength output; see Fig.4

V15 output voltage ViIF = 0 0 0.1 0.25 V

ViIF = 1 mV (RMS) 1.1 1.5 1.9 V

ViIF = 250 mV (RMS) 3.2 3.6 4.1 V

S control steepness −0.85 −V/dec

R15 output resistance −150 200 Ω

dependence on temperature −0.3 −%/K

I15 standby operational cut-off current V5≥3 V; V15 =0to5V −−10 µA

Zero level adjustment

V16 internal bias voltage −260 −mV

R16 input resistance −19 −kΩ

S control steepness ViIF = 100 mV; 0.87 1.0 1.2 V/V

Detuning detector

I12 input bias current −20 100 nA

Z12 input impedance ; see Fig.5 630−MΩ

output voltage ratio for

∆ϕ =ϕ(V3-7)−ϕ(V4-6)−90°V1=V

2= 7.5 V;

R13-14 =10kΩ; pins 9

and 12 short-circuit;

see Fig.6

∆ϕ = 9.2°(43 kHz); Q = 20 V9, 12 = 334 mV 0.45 0.5 0.55 V/V

∆ϕ = 3.5°(16 kHz); Q = 20 V9, 12 = 138 mV 0.75 0.8 0.85 V/V

∆ϕ =14°(65 kHz); Q = 20 V9, 12 = 501 mV 0.335 0.345 0.355 V/V

I13 maximum output current V13 = 6 V; see Fig.7 0.4 0.5 0.6 mA

cut-off current V13 = 2.5 V; V9, 12 =0 −−−100 nA

Internal audio attenuation; see Fig.8

output voltage ratio α= attenuation factor

α= 1 dB 0.11 0.12 0.13 V/V

α= 7.2 dB 0.095 0.1 0.105 V/V

α≥40 dB −0.06 −V/V

I13 input current V13 ≤0.1 V −−−225 nA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V∆T∆

------- ViIF V15

∆

T∆V15

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

AV15

∆V16

∆

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

Z12 5V

∆

----------

V13

V14

---------

V13

V14

---------

1998 Nov 18 8

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

OPERATING CHARACTERISTICS

VP= 8.5 V; fIF = 10.7 MHz; RS=60Ω; fm= 400 Hz with ∆f=±22.5 kHz; 50 µs de-emphasis (C8-9 = 6.8 nF);

Tamb =25°C and measurements taken in Fig.1; unless otherwise speciﬁed. The demodulator circuit is adjusted at

minimum second harmonic distortion with ViIF = 1 mV.

Standby switch; see Fig.9

V5input voltage for FM on ;

V19 = 0.3 V

2.4 2.5 −V

input voltage for FM off −2.9 3 V

linear range −350 −mV

I5input current V5=0to2V −−−100 µA

V5= 3.5 to 15 V −−1µA

temperature dependence FM on (3.5VBE)−7−mV/K

FM off (5VBE)−10 −mV/K

Supply voltage smoothing

V1-2 internal voltage drop proportional to

V1−3VBE

80 210 400 mV

R1-2 internal resistor 5.8 8.3 10.8 kΩ

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

IF ampliﬁer and demodulator

ViIF(rms) input sensitivity (RMS value) −3 dB before limiting 14 22 35 µV

S/N = 26 dB −10 −µV

S/N = 46 dB −55 −µV

oAF(rms) AF output voltage (RMS value) 60 67 75 mV

VoN noise voltage for ViIF = 0 (RMS value;

pins 8 and 9) RS= 300 Ω;

f = 250 to 15000 Hz −900 −µV

weighted noise voltage in accordance with

“DIN 45405”

−2−mV

S/N signal-to-noise ratio (pins 8 and 9) ViIF = 1 mV (RMS);

see Fig.3 −72 −dB

αAM AM suppression ViIF = 0.5 to 200 mV;

FM: 70 Hz; ±15 kHz;

AM: 1 kHz; m = 30%

−50 −dB

αFM FM suppression for FM off ViIF = 500 mV; V5=3V 80 −−dB

∆V8, 9 AFC shift in relation to minimum second

harmonic distortion α2H

ViIF = 0.03 to 500 mV −25 −mV

DC offset at second harmonic distortion operating −0±100 mV

mute or FM off −0±50 mV

α3H distortion for third harmonic −0.65 −%

RR ripple rejection Vripple = 200 mV on VPf = 100 Hz 43 48 −dB

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V3, 7

V3, 7(max)

----------------------- 0.9=

T∆

-------

1998 Nov 18 9

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

Fig.3 AF output voltage level on pins 8 and 9 as a function of ViIF at VP= 8.5 V; fm= 1 kHz; QL= 20 with

de-emphasis.

handbook, full pagewidth

−80

−60

−40

−20

10−610−510−410−310−210−11

V8, V9

(dB)

Vi 17 (rms) (V)

MEH166

S +N

Fig.4 Field strength output (I16 = 0).

handbook, full pagewidth

10−610−510−410−310−210−11

V15

(V)

ViIF (rms) (V)

MEH143

1998 Nov 18 10

Philips Semiconductors Product speciﬁcation

FM/IF ampliﬁer/demodulator circuit TDA1576T

Fig.5 Detuning input impedance.

handbook, halfpage

MEH144

I12

V9, 12

Fig.6 Detuning curve.

handbook, halfpage

−1.2 −0.8 −0.4 0 0.4 0.8

V13/V14

1.2

V9, 12 (V)

MEH145

0.5

Fig.7 Detuning output.

handbook, halfpage

024

(mA)

V13 (V)

MEH146

0.5

|V9, 12|1.2 1 0.5 0

Fig.8 Internal audio attenuation.

handbook, halfpage

0 0.1 0.2

αVo

(dB)

0.3

V13 /V14

MEH147

−20

−40

−60

−80

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