Philips TDA1597 User Manual

INTEGRATED CIRCUITS

DATA SH EET

TDA1597

IF amplifier/demodulator for FM radio receivers

Product speciﬁcation Supersedes data of May 1994 File under Integrated Circuits, IC01

1997 Feb 27

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers TDA1597

FEATURES

• Balanced limiting amplifier

• Balanced coincidence demodulator

• Two open-collector stop pulse outputs for

microcomputer tuning control

• Simulated behaviour of ratio detector (internal field strength and detuning dependent voltage for dynamic AF signal muting)

GENERAL DESCRIPTION

The TDA1597 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 receivers circuits.

All pin numbers mentioned in this data sheet refer to the SO version (TDA1597T) unless otherwise specified.

• 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 CONDITIONS MIN. TYP. MAX. UNIT

iIF(rms)

supply voltage 7.5 8.5 12 V supply current (l2=I7=0) − 20 26 mA IF input sensitivity for limiting on pin 20

14 22 35 µV

(RMS value)

oAF(rms)

S/N signal-to-noise ratio f

AF output signal on pin 4 (RMS value) 180 200 220 mV

= 400 Hz;

− 82 − dB

∆f=±75 kHz

THD total harmonic distortion f

= 1 kHz;

− 0.1 0.3 %

∆f=±75 kHz

K2 adjustment and

− 0.07 0.25 %

FM-MUTE-OFF

amb

operating ambient temperature −40 − +85 °C

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA1597 DIP18 plastic dual in-line package; 18 leads (300 mil) SOT102-1 TDA1597T SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1

1997 Feb 27 2

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers TDA1597

BLOCK DIAGRAM

STOP-0 STOP-1

n.c.

+5 V

25 kΩ

14

25 kΩ

15

16

47 nF

11 (10)

(12)

(13)

(14)

100

kΩ

3.3

+−

int

=19

10

(9)

FM-OFF

MUTE-OFF

offset

n.c.

MODE

×2

SWITCH

MED829

7(7) 8(8)

5(5) 6(6)

(2) (3)

ref

100 nF

(4)

information

ref

330 Ω

SFE

(1)

22 nF22 nF

13

17

18

19

20

(11)

(15)

(16)

(17)

(18)

TDA1597T

int

25 kΩ

LEVEL

DETECTOR

oAF

int

DETUNE

DETECTOR

HP

FILTER

LP

FILTER

50 kHz

1 MHz

25 kΩ

MUTE

THD

ATTENUATOR

COMPENSATION

ref

MPX signal weighted level

adjustment

for minimum

2nd harmonic

(FM-MUTE-OFF)

handbook, full pagewidth

Fig.1 Block diagram and application circuit.

QUADRATURE

DEMODULATOR

9 pF

int

25

kΩ

int

40 kΩ

LIMITING

AMPLIFIER

9 pF

VOLTAGE

STABILIZER

information

(FM-MUTE-ON)

unweighted level

kΩ

7.5

40

kΩ

optional level shift

ref

1(1) 2(2) 3(3) 4(4)

ref

(+8.5 V)

input

FM-IF

1997 Feb 27 3

The pin numbers given in parenthesis refer to the TDA1597.

(1) Connecting 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 TDA1597

PINNING

SYMBOL

DESCRIPTION

DIP18 SO20

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

ref

4 4 audio frequency output (MPX signal)

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 9 10 demodulator input 1 DEMI2 10 11 demodulator input 2 n.c. − 12 not connected TSW 11 13 tau switch input ST1 12 14 STOP-1, stop pulse output 1 ST0 13 15 STOP-0, stop pulse output 0 MUTE 14 16 muting voltage GND 15 17 ground (0 V) LFB1 16 18 IF limiter feedback 1 LFB2 17 19 IF limiter feedback 2 V

iIF

18 20 IF signal input

handbook, halfpage

LVA ULV

oAF V

ref

WLV

MODE

DDV

DEMI1

2 3 4 5

TDA1597

6 7 8 9

MED830

18 17 16 15 14 13 12 11 10

iIF

LFB2 LFB1 GND MUTE ST0 ST1 TSW DEMI2

Fig.2 Pin configuration (DIP version).

1997 Feb 27 4

handbook, halfpage

Fig.3 Pin configuration (SO version).

LVA ULV

oAF V

ref

WLV

MODE

DDV

n.c.

DEMI1

1 2 3 4 5

TDA1597T

6 7 8 9

MED831

20 19 18 17 16 15 14 13 12 11

iIF

LFB2 LFB1 GND MUTE ST0 ST1 TSW n.c.

DEMI2

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers TDA1597

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 gives a very stable IF performance. The amplifier gain is virtually independent of changes in temperature.

The FM demodulator is fully balanced and contains 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 of the demodulator output is restricted by an internal low-pass filter to approximately 1 MHz. Non-linearities, which are introduced by demodulation, are compensated for 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.

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 connected to 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 the 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. Pins 14 and 15 may be tied together if only one tuning-stop output is required.

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

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

−0.3 V

19 and 20

14, 15

tot

stg

amb

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

all pins except pins 5 and 7 note 1 −2000 +2000 V pin 5 note 1 −2000 +800 V pin 7 note 1 −2000 +1000 V

Note

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

1997 Feb 27 5

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers TDA1597

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

th j-a

CHARACTERISTICS

= 8.5 V; T

Vi= 10 mV (RMS) 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

thermal resistance from junction to ambient in free air

SOT102-1 80 K/W SOT163-1 90 K/W

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

amb

supply voltage 7.5 8.5 12 V supply current I2=I7=0 − 20 26 mA

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

FM-MUTE-OFF 0.9V FM-OFF;

−−1.4 V

−−V

ref

AF attenuation >60 dB

IF ampliﬁer and demodulator

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)

PSRR power supply ripple rejection

output resistance − 400 −Ω DC output voltage level V

(pin 4)

≤ 5 µV (RMS) on pin 20 2.75 3.1 3.45 V

iIF

f = 1000 Hz;

= 50 mV (RMS)

ripple

33 36 − dB

Tuning stop detector

∆f

STOP-0

∆f

STOP-1

20(rms)

14, 15

detuning frequency for STOP-0 (pin 15)

detuning frequency for STOP-1 (pin 14)

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

output voltage I

V15≥ 3.5 V; see Fig.11 −−26 kHz

≤ 0.3 V; see Fig.11 38 −−kHz

V14≥ 3.5 V; see Fig.10 −−−26 kHz

≤ 0.3 V; see Fig.10 −38 −−kHz

≥ 3.5 V; see Fig.9 250 −−µV

14, 15

≤ 0.3 V; see Fig.9 −−50 µV

14, 15

=1mA −−0.3 V

14, 15

Reference voltage source (pin 5)

ref

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

TC temperature coefﬁcient − 3.3 − mV/VK

1997 Feb 27 6

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers TDA1597

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

External muting

S steepness of control voltage

Internal mute α; note 1 α mute voltage V

Level detector

∆V

TC temperature coefﬁcient − 3.3 − mV/VK ∆f detuning frequency V S steepness of control voltage

muting voltage at I2=0 V20≤ 5 µV (RMS); see Fig.12 1.45 1.75 2.05 V

= 1 mV (RMS) 3.0 3.45 3.9 V

slope: 100 µV ≤ V

20∆ V20log 20 dB

≥ V

ref

= 0.77V

= 0.55V

ref ref

≤ 100 mV;

∆V

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

∆ V20log

− 0.85 − V/dec

− 0 − dB

1.5 − 4.5 dB

− 20 − dB

current for capacitor (pin 16)

charge current V discharge current V charge current V discharge current V

=0V −−8−µA

=0V − 120 −µA

13 13=Vref 13=Vref

−−100 −µA

− 120 −µA

output resistance pin 6 −−500 Ω output voltage at I2=0 V20≤ 5 µV (RMS); see Fig.14 0.1 − 1.1 V

= 1 mV (RMS) 3.0 − 4.2 V

±200 kHz detuning 1.2 1.5 1.8 V

output voltage at V

2=V5

V20≤ 5 µV (RMS) −−0.3 V

output voltage at detuning ±45 kHz detuning −−0.2 V

= 1.8 V; see Fig.13 90 − 160 kHz

slope: 50 µV ≤ V

20∆ V20log 20 dB

≤ 50 mV;

∆V

--------------------∆ V20log

1.4 1.7 2.0 V/dec

∆V

/∆f slope of output voltage at

∆f = 125 ±20 kHz − 35 − mV/kHz

detuning

S level shift adjustments

range by pin 2 ±∆V gain −∆V range by pin 2 ±∆V gain −∆V

6/Vref

/∆V

6 16/Vref

/∆V

Note

∆V

α 20

4FM MUTE– OFF–()

-------------------------------------------------------log= ∆V

4FM MUTE– ON–()

1997 Feb 27 7

0.42 0.5 − V/V

− 1.7 − V/V

0.21 0.25 − V/V

− 0.85 − V/V

Philips Semiconductors Product speciﬁcation

IF ampliﬁer/demodulator for FM radio receivers TDA1597

OPERATING CHARACTERISTICS

VP= 7.5 to 12 V; T Vi= 10 mV (RMS) 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

IF ampliﬁer and demodulator

i(rms)

input signal for start of limiting (−3 dB) (RMS value; pin 20)

input signal for signal-to-noise ratio (RMS value)

S/N signal-to-noise ratio deviation ±75 kHz − 82 − dB V

o(rms)

AF output signal (RMS value; pin 4)

THD total harmonic distortion without

de-emphasis

without detuning deviation±75 kHz; f

±25 kHz detuning deviation ±75 kHz; f

compensated via pin 3 deviation ±75 kHz; f

∆V

K2 adjustment

∆V

AM suppression on pin 4 V7=V

V V

Dynamic mute attenuation α; note 1 α dynamic mute attenuation deviation ±75 kHz;

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

amb

V7=V

f = 250 to 15000 Hz; V

; FM-MUTE-OFF 14 22 35 µV

ref

7=Vref

S/N = 26 dB − 15 −µV S/N = 46 dB − 60 −µV

180 200 220 mV

= 1 kHz;

− 0.1 0.3 %

I7=0

= 1 kHz;

−−0.6 %

I7=0

I7=0;V7=V

ref

= 1 kHz;

− 0.07 0.25 %

10 −−mV

4=V4(V3

= 0.3 to 1000 mV (RMS) on pin 20 46 55 − dB

= 1 to 300 mV (RMS) on pin 20 60 65 − dB

=0)−V4(V3=V

ref

)

; m = 30%

ref

− 14 − dB

fm= 100 kHz; V2=1V

1997 Feb 27 8

+ 16 hidden pages