Philips TDA1597-V1 Datasheet

DATA SH EET

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

1997 Feb 27

INTEGRATED CIRCUITS

TDA1597

IF amplifier/demodulator for FM
radio receivers

1997 Feb 27 2

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)

• 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.

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.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

supply voltage 7.5 8.5 12 V

I

P

supply current (l2=I7=0) − 20 26 mA

V

iIF(rms)

IF input sensitivity for limiting on pin 20
(RMS value)

14 22 35 µV

V

oAF(rms)

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

S/N signal-to-noise ratio f

m

= 400 Hz;

∆f=±75 kHz

− 82 − dB

THD total harmonic distortion f

m

= 1 kHz;

∆f=±75 kHz

− 0.1 0.3 %

K2 adjustment and
FM-MUTE-OFF

− 0.07 0.25 %

T

amb

operating ambient temperature −40 − +85 °C

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

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 3

Philips Semiconductors Product specification

IF amplifier/demodulator for FM radio receivers TDA1597

BLOCK DIAGRAM

handbook, full pagewidth

LEVEL

DETECTOR

LIMITING

AMPLIFIER

VOLTAGE

STABILIZER

MODE

SWITCH

QUADRATURE

DEMODULATOR

LP

FILTER

1 MHz

THD

COMPENSATION

unweighted level

information

(FM-MUTE-ON)

adjustment

for minimum

2nd harmonic

(FM-MUTE-OFF)

optional level shift

HP

FILTER

50 kHz

DETUNE

DETECTOR

MUTE

ATTENUATOR

V

int

V

ref

V

ref

V

P

(+8.5 V)

V

offset

V

int

V

int

V

ref

V

int

+5 V

V

ref

V

ref

V

oAF

25

kΩ

25 kΩ

40 kΩ

40

kΩ

3.3

kΩ

7.5

kΩ

25 kΩ

330 Ω

V

int

9 pF

22 nF22 nF

19

(17)

18

(16)

17

(15)

13

(11)

16

(14)

15

(13)

14

(12)

(1)

20

(18)

SFE

FM-IF

input

9 pF

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

(2) (3)

(4)

MPX signal weighted level

information

FM-OFF

+−

MUTE-OFF

5(5) 6(6)

100 nF

7(7) 8(8)

9

47 nF

100

pF

25 kΩ

25 kΩ

STOP-0 STOP-1

n.c.

Q

L

=19

MED829

12

11 (10)

10

(9)

n.c.

×2

TDA1597T

Fig.1 Block diagram and application circuit.

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.

1997 Feb 27 4

Philips Semiconductors Product specification

IF amplifier/demodulator for FM radio receivers TDA1597

PINNING

SYMBOL

PIN

DESCRIPTION

DIP18 SO20

V

P

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

4 4 audio frequency output (MPX signal)
V

ref

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

Fig.2 Pin configuration (DIP version).

handbook, halfpage

TDA1597

MED830

1
2
3
4
5
6
7
8
9

18
17
16
15
14
13
12
11
10

V

P
LVA
ULV

WLV

MODE

DDV

DEMI1

V

oAF
V

ref

V

iIF

DEMI2

TSW

ST1

ST0

MUTE

GND

LFB1

LFB2

Fig.3 Pin configuration (SO version).

handbook, halfpage

TDA1597T

MED831

1
2
3
4
5
6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

V

P
LVA
ULV

WLV

MODE

DDV

n.c.

DEMI1

V

oAF
V

ref

V

iIF

n.c.

DEMI2

TSW

ST1

ST0

MUTE

GND

LFB1

LFB2

1997 Feb 27 5

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).

Note

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage −0.3 +13 V

V

n

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

19 and 20

−0.3 V

P

V

V

13

voltage on pin 13 − 6V

I

14, 15

current at pins 14 and 15 − 2mA

P

tot

total power dissipation − 360 mW

T

stg

storage temperature −55 +150 °C

T

amb

operating ambient temperature −40 +85 °C

V

es

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

1997 Feb 27 6

Philips Semiconductors Product specification

IF amplifier/demodulator for FM radio receivers TDA1597

THERMAL CHARACTERISTICS

CHARACTERISTICS

V

P

= 8.5 V; T

amb

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

R

th j-a

thermal resistance from junction to ambient in free air

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

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

supply voltage 7.5 8.5 12 V

I

P

supply current I2=I7=0 − 20 26 mA

Mode switch input

I

7

input current FM-MUTE-ON − 0 − mA

V

7

input voltage FM-MUTE-ON 2.4 2.8 3.2 V

FM-MUTE-OFF 0.9V

ref

−−V

FM-OFF;
AF attenuation >60 dB

−−1.4 V

IF amplifier and demodulator

Z

i

demodulator input impedance
between pins 10 and 11

25 40 55 kΩ

C

i

demodulator input capacitance
between pins 10 and 11

− 6 − pF

AF output (pin 4)

R

o

output resistance − 400 −Ω

V

4

DC output voltage level V

iIF

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

PSRR power supply ripple rejection

(pin 4)

f = 1000 Hz;
V

ripple

= 50 mV (RMS)

33 36 − dB

Tuning stop detector

∆f

STOP-0

detuning frequency for STOP-0
(pin 15)

V15≥ 3.5 V; see Fig.11 −−26 kHz
V

15

≤ 0.3 V; see Fig.11 38 −−kHz

∆f

STOP-1

detuning frequency for STOP-1
(pin 14)

V14≥ 3.5 V; see Fig.10 −−−26 kHz
V

14

≤ 0.3 V; see Fig.10 −38 −−kHz

V

20(rms)

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

V

14, 15

≥ 3.5 V; see Fig.9 250 −−µV

V

14, 15

≤ 0.3 V; see Fig.9 −−50 µV

V

14, 15

output voltage I

14, 15

=1mA −−0.3 V

Reference voltage source (pin 5)

V

ref

reference output voltage I5= −1 mA 3.3 3.7 4.1 V

R

5

output resistance I5= −1mA − 40 80 Ω

TC temperature coefficient − 3.3 − mV/VK

1997 Feb 27 7

Philips Semiconductors Product specification

IF amplifier/demodulator for FM radio receivers TDA1597

Note

1.

External muting

V

16

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

V

20

= 1 mV (RMS) 3.0 3.45 3.9 V

S steepness of control voltage

slope: 100 µV ≤ V

20

≤ 100 mV;

− 0.85 − V/dec

Internal mute α; note 1
α mute voltage V

16

≥ V

ref

− 0 − dB

V

16

= 0.77V

ref

1.5 − 4.5 dB

V

16

= 0.55V

ref

− 20 − dB

I

16

current for capacitor (pin 16)

charge current V

13

=0V −−8−µA

discharge current V

13

=0V − 120 −µA

charge current V

13=Vref

−−100 −µA

discharge current V

13=Vref

− 120 −µA

Level detector

R

6

output resistance pin 6 −−500 Ω

V

6

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

V

20

= 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

∆V

6

output voltage at detuning ±45 kHz detuning −−0.2 V
TC temperature coefficient − 3.3 − mV/VK
∆f detuning frequency V

6

= 1.8 V; see Fig.13 90 − 160 kHz

S steepness of control voltage

slope: 50 µV ≤ V

20

≤ 50 mV;

1.4 1.7 2.0 V/dec

∆V

6

/∆f slope of output voltage at

detuning

∆f = 125 ±20 kHz − 35 − mV/kHz

S level shift adjustments

range by pin 2 ±∆V

6/Vref

0.42 0.5 − V/V

gain −∆V

6

/∆V

2

− 1.7 − V/V

range by pin 2 ±∆V

16/Vref

0.21 0.25 − V/V

gain −∆V

16

/∆V

2

− 0.85 − V/V

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

20∆ V20log 20 dB

∆V

16

∆ V20log

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

=

20∆ V20log 20 dB

∆V

6

∆ V20log

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

=

α 20

∆V

4FM MUTE– OFF–()

∆V

4FM MUTE– ON–()

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

1997 Feb 27 8

Philips Semiconductors Product specification

IF amplifier/demodulator for FM radio receivers TDA1597

OPERATING CHARACTERISTICS

VP= 7.5 to 12 V; T

amb

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

V

i(rms)

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

V7=V

ref

; FM-MUTE-OFF 14 22 35 µV

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

f = 250 to 15000 Hz; V

7=Vref

S/N = 26 dB − 15 −µV

S/N = 46 dB − 60 −µV
S/N signal-to-noise ratio deviation ±75 kHz − 82 − dB
V

o(rms)

AF output signal (RMS value;
pin 4)

180 200 220 mV

THD total harmonic distortion without

de-emphasis

without detuning deviation±75 kHz; f

m

= 1 kHz;

I7=0

− 0.1 0.3 %

±25 kHz detuning deviation ±75 kHz; f

m

= 1 kHz;

I7=0

−−0.6 %

compensated via pin 3 deviation ±75 kHz; f

m

= 1 kHz;

I7=0;V7=V

ref

− 0.07 0.25 %

∆V

4

K2 adjustment
∆V

4=V4(V3

=0)−V4(V3=V

ref

)

10 −−mV

α

AM

AM suppression on pin 4 V7=V

ref

; m = 30%

V

i

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

V

i

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

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

fm= 100 kHz; V2=1V

− 14 − dB