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
Vint
Vref
Vref
VP (+8.5 V)
Voffset
Vint
Vint
Vref
Vint
+5 V
Vref
Vref
VoAF
25
kΩ
25 kΩ
40 kΩ
40
kΩ
3.3
kΩ
7.5
kΩ
25 kΩ
330 Ω
Vint
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.
QL =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 pin13 (11) to ground is only allowed to measure the current on pin16 (14).

(2) FM-MUTE-OFF.

(3) FM-OFF.

(4) FM-MUTE-ON.