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GSG
Gunter Semiconductor GmbH
TDA1574
EDITION 09/00
Car and Home Receiver Integrated FM tuner
For inquiry please contact : China Tel: 0086-755-3200442 Fax: 0086-755-3355520 Hong Kong Tel : 00852-26190748 Fax: 00852-24948080 e-mail sales@gsg-asia.com
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
24.8 0.2 2.54 1.40 6.5 +0.2 -0.1
5.1
3.5 -0.5
+1.0
0.51
3.6
+0.2 -0.1
2.54
0.47 0.12
0.25
M
0.27 -0.07
+0.09
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 2 3 4 5 6 7 8 9
09/00
mixer input 1 mixer input 2 wideband information input ground reference voltage oscillator output oscillator input 1 oscillator input 2 buffered oscillator output
10 11 12 13 14 15 16 17 18
IF output standby switch narrow band information input IF input 1 IF input 2 supply voltage mixer output 1 mixer output 2 AGC-output
1
Block Diagram
10 +V CC 10 n 5.5 82 p 5.5 n2 17 IF OUTPUT 16 V p 15 12 n1 68 MIXER OUTPUT VOLTAGE 300 RML VaM IF INPUT AGC NARROW BAND INFORMATION ON TUNER V iIF 22 n 14 300 + + 50A OUTPUT 100 AGC 18 22 n + 200 + 10 k BUFFERED OSCILLATOR OUTPUT 1n 75 + + STAND BY SWITCH VOLTAGE STABILIZER 5 4.1 V 10 n 22 n 13 IF AMPLIFIER 300 10 22 n 300 V ref IF OUTPUT VOLTAGE V aIF
OFF 11
=
+
0.5 V
V p
=
AGC-VOLTAGE GENERATION 1.7V
-
950 OSCILLATOR OUTPUT BUFFERS +
9
+
DOUBLE BALANCED MIXER
14 14
OSCILLATOR
+
TDA 1574
HF INPUT 1 50 V e1HF 6.8 p 56 p 6.8 p R g2 50 30 p 3 1/4 n1 n2 1 1/4 2 3 1n 4 6 3.9 p 7 8
~ ~
R g1 (98MHz)
1 n1 n2
4 56 p
~ ~
(98 MHz)
V e2HF 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 Supply voltage Mixer output DC voltage VCC V16-4 V17-4 V12-4 0.3 0.3 max 18 35 35 7 unit V V V V
Narrow band information input voltage Reference voltage Standby switch input voltage Total power dissipation Ambient operating temperature Storage temperature Thermal resistance
V5-4 V11-4 Ptot Ta Ts Rth
0.3 0.3
7 23 800
V V mW C C K/W
-40 -55
85 150 80
note: All pins are short-circuit protected to ground
Recommended Operational Conditions
min Supply voltage Ambient operating temperature V9 Ta 7.0 -40 max 16 85 unit V C
09/00 TDA1574
3
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 Supply current (except mixer) Reference voltage VCC ICC V5-4 7.0 16.0 3.9 8.5 24.4 4.1 16.0 30.0 4.4 V mA V
Mixer
Current consumption DC input voltage DC output voltage Noise figure Noise figure including input network 3rd order intercept point Conversion power gain Input resistance Input capacitance Output resistance Output capacitance I16 + I17 V1,2,4 V16,17-4 NF NF 3.5 4.0 4.0 10 12 3.9 4.5 35.0 35.0 mA V V dB dB
EMF1lP3 Gcp R1-4 C1-4 R17-4 C17-4 10
117 14 22 14 1.9 5.7
dBV dB pF k pF
Oscillator
DC input voltage DC output voltage Residual FM V7,8-4 V6-4 f 1.3 2.0 2.2 V V Hz
Oscillator output buffer (measuring output)
DC output voltage Oscillator output voltage RL = infinite, CL = 2 pF RL = 75
4
V9-4
6.0
V
V9-4(rms) V9-4(rms)
30 30
110 62
mV mV
09/00 TDA1574
min Output resistance R9-15
typ 950
max
unit
Linear IF amplifier
DC input voltage DC output voltage Input impedance V13-4 V10-4 R14-13 C14-13 R10-4 C10-4 GV 240 1.2 4.5 300 13 300 3 30.6 360 V V pF pF dB
Output impedance
240
360
Voltage gain f = 10.7 MHz 1 dB compression point VCC = 8.5 V VCC = 7.5 V Signal to noise ratio
28
V10-4(rms) V10-4(rms) S/N
750 550 6.6
mV mV dB
Keyed AGC
Output voltage range AGC output current I3 = 0 or V12-4 = 450 mV V18-4 = VCC / 2 V3-4 = 2 V, V12-4 =1 V, V18-4 = V15-4 Narrowband threshold V3-4 = 2 V, V12-4 = 550 V V18-4 = 450 V Input impedance V18-4 0.5 VCC-0.3 V
-I18 I18
25 2
50 35
100 5
A mA
V18-4 V18-4 R3-4 C3-4 EMF2(rms)
0.036 VCC-0.3 4 3 20
1
V V k pF mV
Wideband threshold V12-4 = 0.7 V, V18-4 = VCC / 2, I18 = 0
Electronic standby switch
Input switching voltage for threshold ON at V18-4 VCC - 3 V for threshold OFF at V18-4 0.5 V
09/00 TDA1574
V11-4 V11-4
0 3.3
2.3 20
V V
5
min Switching range Input current at ON condition with V11-4 = 0 at OFF condition with V11-4 = 20 V Input voltage at I11 = 0 V11-4 2.3
typ 2.8
max 3.3
unit V
-I11 I11
60 10
150 20
A A
V11-4
3.0
4.4
V
Dependences
10.0 TDA 1574 V18 = f ( Vi ) with VCC = 8.5 V ViBB = 2.0 V I18 ( mA )
5 TDA 1574 I18 = f ( Vi ) with VCC = 8.5 V ViBB = 2.0 V
V18 ( V )
4
3 5.0 2
1
0
0 470 500 Vi ( mV ) 540 470 500 Vi ( mV ) 540
6
09/00 TDA1574
5 I18 ( mA ) TDA 1574 I18 = f ( ViBB ) 4 with VCC = 8.5 V f = 100 MHz Vi = 0.7 V 3
10 V18 ( V ) TDA 1574 V18 = f ( ViBB ) 8 with VCC = 8.5 V f = 100 MHz Vi = 0.7 V 6
2
4
1
2
0 14 20 ViBB ( V ) 28
0 14 20 ViBB ( V ) 28
35 IF - GAIN with VCC = 8.5 V ViIF = 10 mVeff GIF = f ( Ta ) f = 10.7 MHz
19 MIXER - GAIN GM = f ( Ta ) VCC = 8.5 V ViRF = 20 mVeff f = 100 MHz
GIF ( dB )
30
25 -40 -25
09/00 TDA1574
GM ( dB ) 14 9 70 85 -40 -25
0
25
Ta ( C )
0
25
Ta ( C )
70
85
7
19 MIXER - GAIN GM ( dB ) with ViRF = 10 mVeff f = 100 MHz
4.4 REFERENCE VOLTAGE Vref ( V ) Vref = f ( Ta ) with VCC = 8.5 V
GM = f ( VCC )
4.2 14 4.1
4.0
9 5.0
3.9 10.0 VCC ( V ) 15.0 -40 -25 0 25 Ta ( C ) 70 85
38 TDA 1574 ICC ( mA ) CURRENT CONSUMPTION ICC = f ( Ta ) with VCC = 8.5 V and mixer current
5.0 I16+17 ( mA ) TDA 1574 MIXER CURRENT (I16 + I17) = f ( Ta ) with VCC = 8.5 V
4.5
30 4.0 26
3.5 22
18 -40 -25 0 25 Ta ( C ) 70 85
3.0 -40 -25 0 25 Ta ( C ) 70 85
8
09/00 TDA1574
4.0 V11 ( V ) TDA 1574 V11 = f ( Ta ) with VCC = 8.5 V
70 TDA 1574 I11 ( A ) SWITCH-OVER VOLTAGE I11 = f ( Ta ) with VCC = 8.5 V
SWITCH-OVER VOLTAGE
3.5
50 3.0 40
2.5 30
2.0 -40 -25 0 25 Ta ( C ) 7 0 85
20 -40 -25 0 25 Ta ( C ) 7 0 85
80
5
Vosc ( mVrms )
I18 ( mA ) 3 2 TDA 1574 I18 = f ( Ta ) 1 with VCC = 8.5 V ViBB = 400 mVeff ( 100 MHz ) Vi = 1.0 V 0 -40 0 Ta ( C ) 90 -40 0 Ta ( C ) 90 TDA 1574 Vosc = f ( Ta ) with VCC = 8.5 V RL = 75 fosc = 110 MHz
40
0
09/00 TDA1574
9
100 TDA 1574 -I18 = f ( Ta ) -I18 ( A ) with VCC = 8.5 V Vi = 0.45 V V18 = VCC/2
50
0 -40 0 Ta ( C ) 90
Application Examples
27
supply voltage + 8.5 V
33 k 18 220 k 180 k 220 k 2.2 ferrite pearl 47 k 22 68 k BB 204 560 p BB 204 L1/L2 L3/L4 antenna transformer Toko E 250 HN-4000023 L1 - 1 wdg. L2 - 4.5 wdgs. L3 - 4.5 wdgs. L4 - 4.5 wdgs. L5/L6 Toko E 516 HNS-200057 L5 - 3.25 wdgs. L6 - 4.25 wdgs. 120 SFJ 10.7 A 10 n 13 12 11 10 SFJ 10.7 A 10 n narrow band AGC information stand-by switching voltage IF-output 330 100 n 330p 470p 10 n 10 n L7/L8 Toko 119 AN (C) L7 - 2 x 5.5 wdgs. L8 - 4 wdgs.
L3
L4
1 4.7p 2 4.7p 3
18 17 150 p
L7 L8
560 p
47 k
68 k
3.9p 4
16
150 p
TDA 1574
5 68 10n 6 BB 204 5.6 k L6 3.9p 7 8 47 k L5 9
15 14
180 k 560 p 6.8 p 560 p 1.2 k 270
560 p BB 204
L1
L2
antenna 75
tuning voltage
oscillator output voltage
10
09/00 TDA1574
stand by
search tuning stop
mode select
0 +V CC
1
AGC
1 HFPRE-AMP. 2 3 4
18 17 16 15
10 11 12 13
9 8 7 6
TDA 1574
5 6 7 8 9 14 13 12 11 10 14 15 16 17 18
TDA 1596
5 4 3 2 1
tuning narrow band AGC
to counter
level indicator
LF-MPX 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.

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