DATA SH EET
Product specification
File under Integrated Circuits, IC01 May 1992
INTEGRATED CIRCUITS
TDA1572T
AM receiver
May 1992 2
Philips Semiconductors Product specification
AM receiver TDA1572T
GENERAL DESCRIPTION
The TDA1572T integrated AM receiver circuit performs all
the active functions and part of the filtering required of an
AM radio receiver. It is intended for use in mains-fed home
receivers and car radios. The circuit can be used for
oscillator frequencies up to 50 MHz and can handle RF
signals up to 500 mV.
RF radiation and sensitivity to interference are minimized
by an almost symmetrical design. The controlled-voltage
oscillator provides signals with extremely low distortion
and high spectral purity over the whole frequency range,
even when tuning with variable capacitance diodes. If
required, band switching diodes can easily be applied.
Selectivity is obtained using a block filter before the IF
amplifier.
Features
•Inputs protected against damage by static discharge
•Gain-controlled RF stage
•Double balanced mixer
•Separately buffered, voltage-controlled and
temperature-compensated oscillator, designed for
simple coils
•Gain-controlled IF stage with wide AGC range
•Full-wave, balanced envelope detector
•Internal generation of AGC voltage with possibility of
second-order filtering
•Buffered field strength indicator driver with short-circuit
protection
•AF preamplifier with possibilities for simple AF filtering
•Electronic standby switch
•IF output for stereo demodulator and search tuning.
QUICK REFERENCE DATA
PACKAGE OUTLINE
20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 13.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VPSupply voltage range 7.5 8.5 14.0 V
IPSupply current range VP = 8.5 V 15 25 28 mA
RF input voltage (RMS value)
ViFR(rms) for (S +N)/N = 6 dB m = 30% −1.5 −µV
V
iRF(rms) for THD = 3% m = 80% −500 −mV
VoIF(rms) IF output voltage (RMS value) Vi = 2 mV(rms) 180 230 290 mV
AF output voltage (RMS value) Vi = 2 mV(rms);
fi = 1 MHz; m = 30%;
VoAF(rms) fm = 400 Hz 240 310 390 mV
AGC range
Change of Vi for 1 dB
∆Vichange of VoAF −86 −dB
Indicator driver (pin 13)
Output voltage Vi = 500 mV(rms);
VoRL= 2.7 kΩ2.5 2.8 3.1 V
May 1992 3
Philips Semiconductors Product specification
AM receiver TDA1572T
Fig.1 Block diagram and test circuits (connections shown in broken lines are not part of the test circuits).
(1) Coil data: TOKO sample no. 7XNS-A7523DY; L1 : N1/N2 = 12/32; Qo = 65; QB = 57.
Filter data: ZF = 700 Ωat R3-4 = 3 kΩ; ZI = 4.8 kΩ.
May 1992 4
Philips Semiconductors Product specification
AM receiver TDA1572T
PINNING
1 MXO mixer output
2 STB standby switch
3 IFI1 IF input 1
4 IFI2 IF input 2
5 DET detector
6 AFO1 AF output 1
7 AGC1 AGC stage 1
8 ACG2 AGC stage 2
9 AFO2 AF output 2
10 n.c. not connected
11 n.c. not connected
12 IFO IF output
13 IND indicator output
14 OSO buffered oscillator output
15 OSC1 oscillator 1
16 OSC2 oscillator 2
17 VPsupply voltage
18 RFI1 RF input 1
19 RFI2 RF input 2
20 GND ground Fig.2 Pinning diagram.
May 1992 5
Philips Semiconductors Product specification
AM receiver TDA1572T
FUNCTIONAL DESCRIPTION
Gain-controlled RF stage and mixer
The differential amplifier in the RF stage employs an AGC negative feedback network to provide a wide dynamic range.
Very good cross-modulation behaviour is achieved by AGC delays at the various signal stages. Large signals are
handled with low distortion and the (S + N)/N ratio of small signals is improved. Low noise working is achieved in the
differential amplifier by using transistors with low base resistance.
A double balanced mixer provides the IF output signal to pin 1.
Oscillator
The differential amplifier oscillator is temperature compensated and is suitable for simple coil connection. The oscillator
is voltage-controlled and has little distortion or spurious radiation. It is specially suitable for electronic tuning using
variable capacitance diodes. Band switching diodes can easily be applied using the stabilized voltage V15-20. An extra
buffered oscillator output (pin 14) is available for driving a synthesizer. If this is not needed, resistor RL(14) can be omitted.
Gain-controlled IF amplifier
This amplifier comprises two cascaded, variable-gain differential amplifier stages coupled by a band-pass filter.
Both stages are gain-controlled by the AGC negative feedback network. The IF output is available at pin 12.
Detector
The full-wave, balanced envelope detector has very low distortion over a wide dynamic range. Residual IF carrier is
blocked from the signal path by an internal low-pass filter.
AF preamplifier
This stage preamplifies the audio frequency output signal. The amplifier output has an emitter follower with a series
resistor which, together with an external capacitor, yields the required low-pass for AF filtering.
AGC amplifier
The AGC amplifier provides a control voltage which is proportional to the carrier amplitude. Second-order filtering of the
AGC voltage achieves signals with very little distortion, even at low audio frequencies. This method of filtering also gives
fast AGC settling time which is advantageous for electronic search tuning. The AGC settling time can be further reduced
by using capacitors of smaller value in the external filter (C16 and C17). The AGC voltage is fed to the RF and IF stages
via suitable AGC delays. The capacitor at pin 7 can be omitted for low-cost applications.
Field strength indicator output
A buffered voltage source provides a high-level field strength output signal which has good linearity for logarithmic input
signals over the whole dynamic range. If the field strength information is not needed, RL(13) can be omitted.
Standby switch
This switch is primarily intended for AM/FM band switching. During standby mode the oscillator, mixer and AF
preamplifier are switched off.
Short-circuit protection
All pins have short-circuit protection to ground.
May 1992 6
Philips Semiconductors Product specification
AM receiver TDA1572T
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Note
1. Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor; (5 pulses, both polarities).
THERMAL RESISTANCE
SYMBOL PARAMETER MIN. MAX. UNIT
VP= V17-20 Supply voltage (pin 17) −16 V
|V18-19| Input voltage −12 V
−V18-19;−V19-20 −0.6 V
V18-19; V19-20 −VPV
I18;I20Input current (pins 18 and 20) −200 mA
Ptot Total power dissipation −500 mW
Tstg Storage temperature range −55 +150 °C
Tamb Operating ambient temperature range −40 +85 °C
TjJunction temperature −+125 °C
Electrostatic handling(1)
Ves all pins except pins 3, 6, 9, 14 −2000 +2000 V
Ves pins 3, 6, 14 −1500 +2000 V
Ves pin 9 −1000 +2000 V
From junction to ambient (in free air) Rth j-a (max.) = 95 K/W
May 1992 7
Philips Semiconductors Product specification
AM receiver TDA1572T
CHARACTERISTICS
VP= V17-20 = 8.5 V; Tamb = 25 °C; fi= 1 MHz; fm= 400 Hz; m = 30%; fIF = 460 kHz; measured in test circuit of Fig.1; all
voltages referenced to ground; unless otherwise specified.
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
Supply
VPSupply voltage (pin 17) 7.5 8.5 14.0 V
IPSupply current (pin 17) 15 25 28 mA
RF stage and mixer (pins 18 and 19)
VIDC input voltage −VP/2 −V
ZiRF input impedance at VI < 300 µV (rms) −5.5 −kΩ
CiRF input capacitance −25 −pF
ZiRF input impedance at VI > 10 mV (rms) −8−kΩ
CiRF input capacitance −22 −pF
ZoIF output impedance (pin 1) 200 −−kΩ
C
oIF output capacitance −6−pF
Conversion transconductance
I1/Vibefore start of AGC −6.5 −mA/V
Maximum IF output voltage, inductive
V1-17(p-p) coupling to pin 1 (peak-to-peak value) −5−V
DC value of output current;
IOat VI = 0 V (pin 1) −1.2 −mA
AGC range of input stage −30 −dB
RF signal handling capability
Input voltage (RMS value)
Vi(rms) for THD = 3% at m = 80% −500 −mV
May 1992 8
Philips Semiconductors Product specification
AM receiver TDA1572T
Oscillator
fosc Frequency range 0.1 −60 MHz
Voltage amplitude (pins 15 to 16)
V(rms) (RMS value) 80 130 150 mV
R(ext) External load impedance (pins 16 to 15) 0.5 −200 kΩ
External load impedance for no
R(ext) oscillation (pins 16 to 15) −−60 Ω
Supply voltage ripple rejection
at VP = 100 mV(rms); fp = 100 Hz
SVRR (SVRR = 20 log [V17/V15]) −55 −dB
Source voltage for switching diodes
V15-20 (6 x VBE) (pin 15) −4.2 −V
DC output current (for switching
−IOdiodes) (pin 15) 0 −20 mA
Change of output voltage at
∆I15 = 20 mA (switch to maximum load)
∆VI(pin 15) −0.3 −V
Buffered oscillator output (pin 14)
VODC output voltage −0.8 −V
Output signal amplitude
Vo(p-p) (peak-to-peak value) −320 −mV
ZOOutput impedance −170 −Ω
−I
O(peak) Output current (peak value) −−3mA
IF, AGC and AF stages
VIDC input voltage (pins 3 and 4) −2.0 −V
ZiIF input impedance (pins 3 to 4) 2.4 3.0 3.9 kΩ
CiIF input capacitance −7−pF
IF input voltage for
THD = 3% at m = 80% (pins 3 and 4)
ViIF(rms) (RMS value) −90 −mV
ZoIF output impedance (pin 12) −50 −Ω
Unloaded IF output voltage
at Vi = 10 mV (pin 12)
VoIF(rms) (RMS value) 180 230 290 mV
Voltage gain before start of AGC
Gv(pins 3 to 4; 6 to 20) −68 −dB
AGC range of IF stages: change of
V3-4 for 1 dB change of Vo(AF);
∆VvV3-4(ref) = 75 mV(rms) −55 −dB
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
May 1992 9
Philips Semiconductors Product specification
AM receiver TDA1572T
AF output voltage (RMS value)
VoAF(rms) at V3-4(IF) = 50 µV(rms) −130 −mV
VoAF(rms) at V3-4(IF) = 1 mV(rms) −310 −mV
ZoAF output impedance (pin 6) 2.8 3.5 4.2 kΩ
ZoAF output impedance (pin 9) 12.4 15.5 18.6 kΩ
Indicator driver (pin 13)
Output voltage at Vi = 0 mV(rms);
VoRL= 2.7 kΩ −−140 mV
Output voltage at Vi = 500 mV(rms);
VoRL= 2.7 kΩ2.5 2.8 3.1 V
RLLoad resistance 1.5 −−kΩ
−I
oOutput current at Vi = 500 mV(rms) −−2.0 mA
ZoOutput impedance at −Io= 0.5 mA −220 −Ω
V
oReverse output voltage at AM off −6−V
Standby switch
Switching threshold at;
VP = 7.5 to 14 V
Tamb = −40 to + 80 °C
V2-20 ON-voltage 0 −2.0 V
V2-20 OFF-voltage 3.5 −20.0 V
−I2ON-current at V2-20 = 0 V −100 200 µA
I2OFF-current at V2-20 = 14 V −−10 µA
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
May 1992 10
Philips Semiconductors Product specification
AM receiver TDA1572T
OPERATING CHARACTERISTICS
VP = 8.5 V; fi = 1 MHz; m = 30%; fm = 400 Hz; Tamb = 25 °C; measured in Fig.1; unless otherwise specified
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
RF sensitivity
RF input voltage
(RMS value)
ViRF(rms) for (S + N)/N = 6 dB −1.5 −µV
V
iRF(rms) for (S + N)/N = 26 dB −15 −µV
V
iRF(rms) for (S + N)/N = 46 dB −150 −µV
V
iRF(rms) at start of AGC −30 −µV
RF large signal handling
RF input voltage
(RMS value)
ViRF(rms) at THD = 3%; m = 80% −500 −mV
ViRF(rms) at THD = 3%; m = 30% −700 −mV
ViRF(rms) at THD = 10%; m = 30% −900 −mV
AGC range
Change of Vi for 1 dB change
∆Viof VoAF; Vi(ref) = 500 mV(rms) −86 −dB
Change of Vi for 6 dB change
∆Viof VoAF; Vi(ref) = 500 mV(rms) −91 −dB
Output signal
(RMS value)
VoIF(rms) IF output voltage at Vi = 2 mV(rms) 180 230 290 mV
AF output voltage
VoAF(rms) at Vi = 4 µV(rms); m = 80% −130 −mV
VoAF(rms) at Vi = 2 mV(rms) 240 310 390 mV
Total harmonic distortion
THD at Vi = 2 mV(rms); m = 30% −0.5 −%
THD at Vi = 2 mV(rms); m = 80% −1.0 −%
THD at Vi = 500 mV(rms); m = 30% −1.0 −%
(S + N)/N Signal-to-noise ratio at Vi = 100 mV(rms) −58 −dB
Supply voltage ripple rejection at Vi = 2 mV(rms)
VP = 100 mV(rms); fp = 100 Hz
SVRR (SVRR = 20 log [VP/VoAF]) −38 −dB
SVRR (a) additional AF signal at IF output −0(1) −dB
SVRR (b) add modulation at IF output (mref = 30%) −40 −dB
May 1992 11
Philips Semiconductors Product specification
AM receiver TDA1572T
Note
1. AF signals at the IF output will be suppressed by a coupling capacitor to the demodulator and by full wave-detection
in the demodulator.
Unwanted signals
Suppression of IF whistles at
Vi = 15 µV; m = 0% related to AF signal
of m = 30%
α2IF at fi≈ 2 × fIF −37 −dB
α3IF at fi≈ 3 × fIF −44 −dB
IF suppression at RF input;
αIF for symmetrical input −40 −dB
αIF for asymmetrical input −40 −dB
Residual oscillator signal at mixer output;
I1(osc) at fosc −1−µA
I
1(2osc) at 2 × fosc −1.1 −µA
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
Fig.3 AF output as a function of RF input in the
circuit of Fig.1; fi = 1 MHz; fm = 400 Hz;
m = 30%.
Fig.4 Total harmonic distortion and (S + N)/N as
functions of RF input in the circuit of Fig.1;
m = 30% for (S + N)/N curve and m = 80%
for THD curve.
May 1992 12
Philips Semiconductors Product specification
AM receiver TDA1572T
Fig.5 Total harmonic distortion as a function of modulation frequency at Vi = 5 mV; m = 80%; measured in
the circuit of Fig.1 with C7-20(ext) = 0 µF and 2.2 µF.
Fig.6 Indicator driver voltage as a function of RF
input in the circuit of Fig.1. Fig.7 Typical frequency response curves from
Fig.1 showing the effect of filtering.
___________ with IF filter;
− − with AF filter;
− − − − − − with IF and AF filters.
May 1992 13
Philips Semiconductors Product specification
AM receiver TDA1572T
Fig.8 IF output voltage as a function of RF input in the circuit of Fig.1; fi = 1 MHz.
Fig.9 Forward transfer impedance as a function of intermediate frequency for filters 1 to 4 shown in
Fig.10; centre frequency = 455 kHz.
May 1992 14
Philips Semiconductors Product specification
AM receiver TDA1572T
APPLICATION INFORMATION
Fig.10 IF filter variants applied to the circuit of Fig.1. For filter data, refer to Table 1.
May 1992 15
Philips Semiconductors Product specification
AM receiver TDA1572T
Fig.11 Application diagram.
May 1992 16
Philips Semiconductors Product specification
AM receiver TDA1572T
Fig.12 (S + N)/N as a function of input voltage; measured in the circuit of Fig.11 for AM stereo.
Fig.13 Total harmonic distortion (THD) as a function of input voltage; measured in the circuit of Fig.11 for AM
stereo.
May 1992 17
Philips Semiconductors Product specification
AM receiver TDA1572T
Table 1 Data for IF filters shown in Fig.10 (Filter 1 to 4) and Fig.11 (Filter 5). Criteria for adjustment is IF = maximum (optimum selectivity curve at
centre frequency f0 = 455 kHz). Filter 5 is used for AM stereo application with centre frequency f0 = 450 kHz.
* The beginning of an arrow indicates the beginning of a winding; N1 is always the inner winding, N2 the outer winding.
FILTER NO. 1 2 3 4 5 UNIT
Coil data L1 L1 L1 L2 L1 L1
Value of C 3900 430 3900 4700 3900 4700 pF
N1 : N2 12 : 32 13 : (33 + 66) 15 : 31 29 : 29 13 : 31 26 : 32
Diameter of CU
laminated wire 0.09 0.08 0.09 0.08 0.09 0.07 mm
Qo65 (typ.) 50 75 60 75 50
Schematic*
of
windings
(N1) (N2)
Toko order no. 7XNS-A7523DY L7PES-A0060BTG 7XNS-A7518DY 7XNS-A7521AIH 7XNS-A7519DY
Resonators
Murata type SFZ455A SFZ455A SFZ455A SFT455B SFH450F
D (typical value) 4 4 4 6 6 dB
RG, RL33 332kΩ
Bandwidth (−3 dB) 4.2 4.2 4.2 4.5 10 kHz
S9kHz 24 24 24 38 dB
Filter data
ZI4.8 3.8 4.2 4.8 1.8 kΩ
QB57 40 52 (L1) 18 (L2) 55 20
ZF0.70 0.67 0.68 0.68 0.70 kΩ
Bandwidth (−3 dB) 3.6 3.8 3.6 4.0 10 kHz
S9kHz 35 31 36 42 dB
S18kHz 52 49 54 64 dB
S27kHz 63 58 66 74 dB
May 1992 18
Philips Semiconductors Product specification
AM receiver TDA1572T
PACKAGE OUTLINE
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZ
ywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm
inches
2.65 0.30
0.10 2.45
2.25 0.49
0.36 0.32
0.23 13.0
12.6 7.6
7.4 1.27 10.65
10.00 1.1
1.0 0.9
0.4 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
1.1
0.4
SOT163-1 92-11-17
95-01-24
10
20
wM
bp
detail X
Z
e
11
1
D
y
0.25
075E04 MS-013AC
pin 1 index
0.10 0.012
0.004 0.096
0.089 0.019
0.014 0.013
0.009 0.51
0.49 0.30
0.29 0.050
1.4
0.055
0.42
0.39 0.043
0.039 0.035
0.016
0.01
0.25
0.01 0.004
0.043
0.016
0.01
0 5 10 mm
scale
X
θ
A
A1
A2
HE
Lp
Q
E
c
L
vMA
(A )
3
A
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
May 1992 19
Philips Semiconductors Product specification
AM receiver TDA1572T
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
“IC Package Databook”
(order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all SO
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
Wave soldering
Wave soldering techniques can be used for all SO
packages if the following conditions are observed:
•A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
•The longitudinal axis of the package footprint must be
parallel to the solder flow.
•The package footprint must incorporate solder thieves at
the downstream end.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Repairing soldered joints
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.
May 1992 20
Philips Semiconductors Product specification
AM receiver TDA1572T
DEFINITIONS
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
Data sheet status
Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
