1997 Feb 27
3
Philips Semiconductors
Product specification
IF amplifier/demodulator for FM radio receivers
TDA1597
BLOCK DIAGRAM
handbook, full pagewidth
LEVEL
DETECT
OR
LIMITING
AMPLIFIER
V
O
LT
A
GE
ST
ABILIZER
MODE
SWITCH
Q
U
ADRA
TURE
DEMODULA
T
O
R
LP
FIL
TER
1 MHz
THD
COMPENSA
TION
unw
eighted le
v
el
inf
or
mation
(FM-MUTE-ON)
adjustment
for minim
um
2nd har
monic
(FM-MUTE-OFF)
optional le
v
el shift
HP
FIL
TER
50 kHz
DETUNE
DETECT
OR
MUTE
A
TTENU
A
T
OR
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
k
Ω
25 k
Ω
40 k
Ω
40
k
Ω
3.3
k
Ω
7.5
k
Ω
25 k
Ω
330
Ω
V
int
9 pF
22 nF
22 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
w
eighted le
v
el
inf
or
mation
FM-OFF
+−
MUTE-OFF
5(5)
6(6)
100 nF
7(7)
8(8)
9
47 nF
100
pF
25 k
Ω
25 k
Ω
ST
OP-0
ST
OP-1
n.c.
Q
L
=19
MED829
12
11 (10)
10
(9)
n.c.
×
2
TD
A1597T
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.
