tda1574.pdf

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199643286 UNPDF
INTEGRATED CIRCUITS
DATA SHEET
TDA1574
Integrated FM tuner for radio
receivers
Product specification
File under Integrated Circuits, IC01
February 1985
199643286.004.png
Philips Semiconductors
Product specification
Integrated FM tuner for radio receivers
TDA1574
GENERAL DESCRIPTION
The TDA1574 is a monolithic integrated FM tuner circuit designed for use in the r.f./i.f. section of car radios and
home-receivers. The circuit comprises a mixer, oscillator and a linear i.f. amplifier for signal processing, plus the following
additional features.
Features
·
Keyed automatic gain control (a.g.c.)
·
Regulated reference voltage
·
Buffered oscillator output
·
Electronic standby switch
·
Internal buffered mixer driving.
QUICK REFERENCE DATA
Supply voltage range (pin 15)
V P
7 to 16 V
Mixer input bias voltage (pins 1 and 2)
V 1, 2-4
typ.
1 V
noise figure
NF
typ.
9 dB
Oscillator output voltage (pin 6)
V 6-4
typ.
2 V
output admittance at pin 6 for f = 108,7 MHz
Y22
typ. 1,5
+
j2 mS
Oscillator output buffer
D.C. output voltage (pin 9)
V 9-4
typ.
6 V
Total harmonic distortion
THD
typ.
-
15 dBC
Linear i.f. amplifier output voltage (pin 10)
V 10-4
typ.
4,5 V
noise figure at R S = 300 W
NF
typ.
6,5 dB
Keyed a.g.c. output voltage range (pin 18)
V 18-4
+
0,5 to V P -
0,3 V
PACKAGE OUTLINE
18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 08.
February 1985
2
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Coil data
L1: TOKO MC-108, 514HNE-150014S14; L = 0,078
m
H
H
L3: TOKO coil set 7P, N1 = 5,5 + 5,5 turns, N2 = 4 turns
m
Fig.1 Block diagram and test circuit.
L2: TOKO MC-111, E516HNS-200057; L = 0,08
199643286.001.png
Philips Semiconductors
Product specification
Integrated FM tuner for radio receivers
TDA1574
FUNCTIONAL DESCRIPTION
Mixer
The mixer circuit is a double balanced multiplier with a preamplifier (common base input) to obtain a large signal handling
range and a low oscillator radiation.
Oscillator
The oscillator circuit is an amplifier with a differential input. Voltage regulation is achieved by utilizing the symmetrical
tanh-transfer-function to obtain low order 2nd harmonics.
Linear IF amplifier
The IF amplifier is a one stage, differential input, wideband amplifier with an output buffer.
Keyed AGC
The AGC processor combines narrow- and wideband information via an RF level detector, a comparator and an ANDing
stage. The level dependent, current sinking output has an active load, which sets the AGC threshold.
The AGC function can either be controlled by a combination of wideband and narrowband information (keyed AGC), or
by a wideband information only, or by narrowband information only. If only narrow-band AGC is wanted pin 3 should be
connected to pin 5. If only wideband AGC is wanted pin 12 should be connected to pin 13.
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Supply voltage (pin 15)
V P = V 15-4
max.
18 V
Mixer output voltage (pins 16 and 17)
V 16, 17-4
max.
35 V
Standby switch input voltage (pin 11)
V 11-4
max.
23 V
Reference voltage (pin 5)
V 5-4
max.
7 V
Field strength input voltage (pin 12)
V 12-4
max.
7 V
Total power dissipation
P tot
max.
800 mW
Storage temperature range
T stg
-
55 to
+
150
C
Operating ambient temperature range
T amb
-
40 to
+
85
C
THERMAL RESISTANCE
From junction to ambient (in free air)
R th j-amb
=
80 K/W
Note
All pins are short-circuit protected to ground.
February 1985
4
°
°
199643286.002.png
Philips Semiconductors
Product specification
Integrated FM tuner for radio receivers
TDA1574
CHARACTERISTICS
V P = V 15-4 = 8,5 V; T amb = 25 ° C; measured in test circuit Fig.1; unless otherwise specified
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
Supply (pin 15)
Supply voltage
V P = V 15-4 7
-
16
V
Supply current (except mixer)
I P = I 15
16
23
30
mA
Reference voltage (pin 5)
V 5-4
3,9
4,1
4,4
V
Mixer
D.C. characteristics
Input bias voltage (pins 1 and 2)
V 1,2-4
-
1
-
V
Output voltage (pins 16 and 17)
V 16,17-4
4
-
35
V
Output current (pin 16 + pin 17)
I 16 + I 17
-
4,0
-
mA
A.C. characteristics (f i = 98 MHz)
Noise figure
NF
-
9
-
dB
Noise figure including transforming network
NF
-
11
-
dB
3rd order intercept point
EMF1 IP3
-
115
-
dB
m
V
Conversion power gain
4V Mout
107MHz
,
)
2
R S1
R ML
G P
-
14
-
dB
(
)
10
log
´
----------------------------------------------------------
----------
2
(
EMF1 98 MHz
)
Input resistance (pins 1 and 2)
R 1,2-4
-
14
-
W
Output capacitance (pins 16 and 17)
C 16,17
-
13
-
pF
Oscillator
D.C. characteristics
Input voltage (pins 7 and 8)
V 7,8-4
-
1,3
-
V
Output voltage (pin 6)
V 6-4
-
2
-
V
A.C. characteristics(f osc = 108,7 MHz)
Residual FM (Bandwidth 300 Hz to 15 kHz);
de-emphasis = 50
m
s
D
f
-
2,2
-
Hz
February 1985
5
(
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