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Philips Semiconductors
FM/IF amplifier/demodulator circuit
CHARACTERISTICS
V
= 8.5 V; f
= 10.7 MHz; R
P
IF
T
= 25 C and measurements taken in Fig.1; unless otherwise specified. The demodulator circuit is adjusted at
amb
minimum second harmonic distortion for V
SYMBOL
V
supply voltage (pin 1)
P
I
supply current
P
Reference voltage
V
reference voltage (pin 14)
ref
V
reference voltage dependence on
ref
temperature
I
maximum output current
14
R
14
output resistor
IF amplifier
V
input sensitivity (RMS value; pin 17)
iIF(rms)
R
input resistance
17-18
C
input capacitance
17-18
V
output voltage at pins 3 and 7
oIF(p-p)
(peak-to-peak value)
R
output resistance
3-7
Demodulator
R
input resistance
4-6
C
input capacitance
4-6
R
output resistance
8, 9
V
DC offset voltage on output pins at
8, 9
V
= 0
4-6
demodulator efficiency
V
------ -
demodulator efficiency dependent on
supply voltage
V/V
DC voltage ratio
dependence on temperature
V
------ -
T
1998 Nov 18
= 60 ; f
= 400 Hz with f = 22.5 kHz; 50 s de-emphasis (C
S
m
= 1 mV and a deviation f = 75 kHz.
iIF
PARAMETER
V
14
------------
I
14
CONDITIONS
V
= V
= V
= 0
5
9
13
I
= 1 mA
14
V
14
----------------------
V
T
14
short-circuit current
I
< 1.2 mA
14
3 dB before limiting
V
= 200 mV (RMS)
iIF
V
= 200 mV (RMS)
iIF
Z
= 10 pF parallel to
3, 7
1 M
V
> 3 V or V
= 0 or
5
3-7
V
< 0.3 V
13
V
8-9
------------- -
V
8-9
-----------------------------------------
V
3V
–
P
BE
V
V
+
8
9
-------------------
2V
2
V
V
+
8
9
-------------------
2V
2
---------------------- -
T
6
Product specification
TDA1576T
= 6.8 nF);
8-9
MIN.
TYP.
MAX.
7.5
8.5
15
10
16
23
4.9
0.3
4
6
7.5
60
150
14
22
35
10
5
610
680
750
200
250
300
20
30
40
1
2.5
2.9
3.7
4.5
0
100
40
6.2
0.653
0.667
0.680
5
10
UNIT
V
mA
V
%/K
mA
V
k
pF
mV
k
pF
k
mV
mV/
mV/
V/V
1/K
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