GSG ÁR›RJS\SO
Gunter Semiconductor GmbH
TDA1574
EDITION 09/00
Car and Home Receiver Integrated
FM tuner
For inquiry please contact :
China Tel: [phone] Fax: [phone]
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Technical Data
TDA1574
Edition 09/00
Integrated FM Tuner for Radio Receivers
Short Description
The integrated circuit contains all the function units needed for a VHF tuner with the exception of the RF pre stage.
It is mainly applied in the RF section of car radios and home receivers.
Package
" DIP 18
+0.2
24.8 Ä… 0.2
6.5
-0.1
d" 2.54 d" 1.40
+0.09
2.54
0.27 -0.07
0.47 Ä… 0.12
M
0.25
7.62
8.0 . . . 9.8
18 17 16 15 14 13 12 11 10
1 2 3 4 5 6 7 8 9
Pin Configuration
1 mixer input 1 10 IF output
2 mixer input 2 11 standby switch
3 wideband information input 12 narrow band information input
4 ground 13 IF input 1
5 reference voltage 14 IF input 2
6 oscillator output 15 supply voltage
7 oscillator input 1 16 mixer output 1
8 oscillator input 2 17 mixer output 2
9 buffered oscillator output 18 AGC-output
09/00 1
+0.2
3.6
+1.0
-0.5
d"
5.1
3.5
e"
0.51
-0.1
Block Diagram
10
MIXER OUTPUT
VOLTAGE
68
10 n
+V n1
CC
IF INPUT
VaM
5.5 300
AGC
TUNER
V
NARROW BAND
iIF
82 p INFORMATION
RML
5.5
n2
22 n 22 n
ON OFF
17 16 15 12 11 14 13
IF OUTPUT
300 IF AMPLIFIER
V
p
IF OUTPUT
-
VOLTAGE
300
10
V
+
aIF
+ 22 n
-
300
0.5 V
V
+ +
ref
+
50µ A
5
STAND BY VOLTAGE
OUTPUT
100 SWITCH STABILIZER
18
AGC V
4.1 V
p 10 n
-
10 k
22 n
+
BUFFERED
200
+
OSCILLATOR
-
= OUTPUT
950
9
AGC-VOLTAGE
1.7V
GENERATION
+ 1 n
OSCILLATOR
75
OUTPUT BUFFERS
+
DOUBLE BALANCED
MIXER
-
14 14
+
OSCILLATOR
TDA 1574
-
HF INPUT
1 2 3 4 6 7 8
1 n
6.8 p 3.9 p
50
56 p
6.8 p
V
R
e1HF
g1
1 4
~
~
~
R 50 30 p
(98MHz) 31/4 11/4
56 p g2
n1 n2
n1 n2
~
~ V
~
e2HF
(98MHz)
for AGC
Functional Description
The TDA1574 is an integrated monolithic FM tuner for use in the RF / IF part of car radios and home receivers. lt
contains all function units for a complete VHF tuner with exception of a RF stage.
The following sections are integrated:
" mixer
" oscillator inclusive buffer stages and a measuring output
" linear IF amplifier
" standby switch
" reference voltage source
" control voltage generation
2 09/00
TDA1574
=
The RF input signal reaches a symmetrically built up mixer, its input stages in common base enable very well
large - signal characteristics. With exception of the RF input signal the mixer receives via buffer stages an ultra
pure oscillator signal with sufficient amplitude, generated by the oscillator itself. Moreover, the oscillator signal is
available at pin 9 via buffer stages for instance in order to drive frequency - synthesizers. The IF signal, supplied
from the mixer, can be amplified by a linear IF preamplifier which is proofed against overdriving in order to
balance signal attenuation by selection means. Wideband or narrow band or also combined gain control of the
pre stage can be selected by means of an internal generated control voltage.
Further on the TDA1574 contains an electronic standby switch. The oscillator can be blocked by this switch and
the gain of the RF pre stage can be reduced, so that the IC is ready at once after activating of the FM operation,
without thermal transients.
An integrated voltage supply delivers a temperature independent voltage of about 4.15 V to provide the oscillator
and to generate an internal comparison voltage. This voltage is available at pin 5.
Absolute Maximum Ratings
min max unit
Supply voltage VCC 0.3 18 V
Mixer output DC voltage V16-4 35 V
V17-4 35 V
Narrow band information V12-4 0.3 7 V
input voltage
Reference voltage V5-4 0.3 7 V
Standby switch input voltage V11-4 0.3 23 V
Total power dissipation Ptot 800 mW
Ambient operating temperature Ta -40 85 °C
Storage temperature Ts -55 150 °C
Thermal resistance Rth 80 K/W
note: All pins are short-circuit protected to ground
Recommended Operational Conditions
min max unit
Supply voltage V9 7.0 16 V
Ambient operating temperature Ta -40 85 °C
09/00 3
TDA1574
Characteristics
VCC = 8.5 V, Ta = 25 °C unless specified otherwise
valid for a test circuit according to the shown first figure.
min typ max unit
Power supply
Supply voltage VCC 7.0 8.5 16.0 V
Supply current (except mixer) ICC 16.0 24.4 30.0 mA
Reference voltage V5-4 3.9 4.1 4.4 V
Mixer
Current consumption I16 + I17 3.5 3.9 4.5 mA
DC input voltage V1,2,4 4.0 35.0 V
DC output voltage V16,17-4 4.0 35.0 V
Noise figure NF 10 dB
Noise figure NF 12 dB
including input network
3rd order intercept point EMF1lP3 117 dBµV
Conversion power gain Gcp 10 14 dB
Input resistance R1-4 22 &!
Input capacitance C1-4 14 pF
Output resistance R17-4 1.9 k&!
Output capacitance C17-4 5.7 pF
Oscillator
DC input voltage V7,8-4 1.3 V
DC output voltage V6-4 2.0 V
Residual FM "f 2.2 Hz
Oscillator output buffer (measuring output)
DC output voltage V9-4 6.0 V
Oscillator output voltage
RL = infinite, CL = 2 pF V9-4(rms) 30 110 mV
RL = 75 &! V9-4(rms) 30 62 mV
4
09/00
TDA1574
min typ max unit
Output resistance R9-15 950 &!
Linear IF amplifier
DC input voltage V13-4 1.2 V
DC output voltage V10-4 4.5 V
Input impedance R14-13 240 300 360 &!
C14-13 13 pF
Output impedance R10-4 240 300 360 &!
C10-4 3pF
Voltage gain GV 28 30.6 dB
f = 10.7 MHz
1 dB compression point
VCC = 8.5 V V10-4(rms) 750 mV
VCC = 7.5 V V10-4(rms) 550 mV
Signal to noise ratio S/N 6.6 dB
Keyed AGC
Output voltage range V18-4 0.5 VCC-0.3 V
AGC output current
I3 = 0 or V12-4 = 450 mV
V18-4 = VCC / 2 -I18 25 50 100 µA
V3-4 = 2 V, V12-4 =1 V,
V18-4 = V15-4 I18 235 5 mA
Narrowband threshold
V3-4 = 2 V,
V12-4 = 550 V V18-4 0.036 1 V
V18-4 = 450 V V18-4 VCC-0.3 V
Input impedance R3-4 4k&!
C3-4 3pF
Wideband threshold EMF2(rms) 20 mV
V12-4 = 0.7 V,
V18-4 = VCC / 2, I18 = 0
Electronic standby switch
Input switching voltage
for threshold ON V11-4 0 2.3 V
at V18-4 e" VCC - 3 V
for threshold OFF V11-4 3.3 20 V
at V18-4 d" 0.5 V
5
09/00
TDA1574
min typ max unit
Switching range V11-4 2.3 2.8 3.3 V
Input current
at ON condition -I11 60 150 µA
with V11-4 = 0
at OFF condition I11 10 20 µA
with V11-4 = 20 V
Input voltage V11-4 3.0 4.4 V
at I11 = 0
Dependences
5
10.0
TDA 1574
TDA 1574
I18 = f ( Vi )
V18 = f ( Vi )
with VCC = 8.5 V
with VCC = 8.5 V
ViBB = 2.0 V
ViBB = 2.0 V
4
3
5.0
2
1
0
0
470 500 540 470 500 540
Vi ( mV ) Vi ( mV )
6
09/00
TDA1574
18
I
( mA )
18
V
( V )
5 10
TDA 1574 TDA 1574
I18 = f ( ViBB ) V18 = f ( ViBB )
with VCC = 8.5 V with VCC = 8.5 V
4 8
f = 100 MHz f = 100 MHz
Vi = 0.7 V Vi = 0.7 V
3 6
2 4
1 2
0 0
14 20 28 14 20 28
ViBB ( V ) ViBB ( V )
35 19
IF - GAIN MIXER - GAIN
GM = f ( Ta )
with VCC = 8.5 V
VCC = 8.5 V
ViIF = 10 mVeff
ViRF = 20 mVeff
GIF = f ( Ta )
f = 10.7 MHz f = 100 MHz
30 14
25 9
-40 -25 0 25 70 85 -40 -25 0 25 70 85
Ta ( ° C ) Ta ( ° C )
7
09/00
TDA1574
18
18
I
( mA )
V
( V )
IF
M
G ( dB )
G ( dB )
19
4.4
MIXER - GAIN
REFERENCE VOLTAGE
GM = f ( VCC )
Vref = f ( Ta )
with ViRF = 10 mVeff
with VCC = 8.5 V
f = 100 MHz
4.2
14
4.1
4.0
9 3.9
5.0 10.0 15.0 -40 -25 0 25 70 85
Ta ( ° C )
VCC ( V )
38 5.0
TDA 1574
TDA 1574
CURRENT CONSUMPTION
MIXER CURRENT
ICC = f ( Ta )
(I16 + I17) = f ( Ta )
with VCC = 8.5 V
with VCC = 8.5 V
4.5
and mixer current
30
4.0
26
3.5
22
18 3.0
-40 -25 0 25 70 85 -40 -25 0 25 70 85
Ta ( ° C ) Ta ( ° C )
8
09/00
TDA1574
M
ref
G ( dB )
V
( V )
16+17
I
( mA )
CC
I
( mA )
4.0
70
TDA 1574 TDA 1574
SWITCH-OVER VOLTAGE SWITCH-OVER VOLTAGE
V11 = f ( Ta ) I11 = f ( Ta )
with VCC = 8.5 V with VCC = 8.5 V
3.5
50
3.0
40
2.5
30
2.0 20
-40 -25 0 25 7 0 85 -40 -25 0 25 7 0 85
Ta ( ° C ) Ta ( ° C )
5
80
3
40
2
TDA 1574
TDA 1574
I18 = f ( Ta )
Vosc = f ( Ta )
1 with VCC = 8.5 V
with VCC = 8.5 V
ViBB = 400 mVeff
RL = 75 &!
( 100 MHz )
Vi = 1.0 V
fosc = 110 MHz
0
0
-40 0 90 -40 0 90
Ta ( ° C ) Ta ( ° C )
9
09/00
TDA1574
11
V
( V )
11
I
(
µ
A )
18
I
( mA )
osc
rms
V
( mV
)
100
TDA 1574
-I18 = f ( Ta )
with VCC = 8.5 V
Vi = 0.45 V
V18 = VCC/2
50
0
-40 0 90
Ta ( ° C )
Application Examples
supply voltage
27 + 8.5 V
33 k
18
L1/L2 L3/L4
antenna transformer
Toko E 250 HN-4000023
BB 204 L1 - 1 wdg.
220 k BB 204 560 p
1 18
L3 L4
L2 - 4.5 wdgs.
L7 L8
180 k 22
4.7p
L3 - 4.5 wdgs.
17
150 p
L4 - 4.5 wdgs.
2
68 k
220 k 2.2 µ
L5/L6
4.7p
Toko E 516 HNS-200057
3
L5 - 3.25 wdgs.
150 p
ferrite L6 - 4.25 wdgs.
3.9p 16
560 p
pearl
47 k 68 k
L7/L8
4 120
47 k
15 Toko 119 AN (C)
TDA 1574
L7 - 2 x 5.5 wdgs.
SFJ 10.7 A
5
L8 - 4 wdgs.
14
180 k
10n 10 n
1.2 k 68
13
6
6.8 p
560 p
270
BB 204
560 p 3.9p
560 p
10 n
12
L6 7
5.6 k narrow band
AGC information
L1 L2 BB 204
8 11
stand-by
47 k
L5 SFJ 10.7 A switching voltage
9 10
antenna
IF-output
75 &!
470p
330
330p 10 n 10 n
100 n
oscillator
tuning voltage
output voltage
10
09/00
TDA1574
18
-I
(
µ
A )
stand by search tuning stop mode select
0 1
+V
CC
AGC
1 18 10 9
HF-
PRE-AMP.
2 17 11 8
3 16 12 7
4 15 13 6
TDA 1574 TDA 1596
5 14 14 5
6 13 15 4
7 12 16 3
8 11 17 2
9 10 18 1
tuning
narrow band AGC
to counter level LF-MPX
indicator signal
FM - front - end based on TDA1574 and TDA 1596
Application Hints
Plns 11 and 12 should be blocked to ground by in each case 10 nF in order to avoid unwanted signal injection.
The IF gain can be adjusted within the range between 10 dB and 82 dB by means of a dc voltage between
0.6 and 1.6 V at pin 3.
Start of the prestage AGC depends on the RF input voltage at pin 3 and on the dc voltage at pin 12. By
appropriate selection of the effective share of the indication voltage at pin 12 the ratio of noise and large signal
charasteristic can be optimized.