P-DSO-28-1
Semiconductor Group
1
04.96
Dual Conversion AM Receiver
TDA 4360X
1
Overview
1.1
Features
High flexibility with an external preamplifier stage
Sym. or asym. mixer input
2-pin oscillator for the 1. LO
1. LO with LC tank circuit
1. LO at 100 MHz range
Low narrow band noise
Divider for 1. LO by 10 for the 100 kHz ... 2 MHz range
and by 8 for the 2 MHz ... 6 MHz range
Integrated AGC generation
Strictly symmetrical RF path
Decoupled counter output
2. LO with quartz or external source
Output for gain controlled 2. IF
Switchable AGC time constant
1.2
Application
The TDA 4360X is an integrated dual conversion AM receiver for use in car radios.
The input signal passes a linear mixer for conversion into the 1. IF (~ 10 MHz). Via an
external bandpass filter (CER filter, quartz filter) the 1. IF is converted in a second linear
mixer to the 2. IF (~ 460 kHz).
After an external narrowband selectivity (CER filter) the 2. IF passes an automatic gain
controlled (AGC) amplifier and is then demodulated to the AF. The AGC time constant
can be switched with a ratio of 20.
For counter controlled search tuning stop (STS) the frequencies of the 1. LO and the
2. IF are available.
Type
Ordering Code
Package
TDA 4360X
Q67000-A5181
P-DSO-28-1
TDA 4360X
Semiconductor Group
2
04.96
1.3
Pin Configuration
(top view)
Figure 1
P-DSO-28-1
TDA 4360X
Semiconductor Group
3
04.96
1.4
Pin Definitions and Functions
Pin No.
Function
1, 2
Sym. Input for the AM signal in the frequency range of 100 kHz (SW) to 6.2
MHz (49m-Band) sym. application is recommended, asym. application is
possible
3
DC voltage alters the threshold voltage of the prestage AGC circuit.
4
GROUND: All DC values are referred to this pin
5
Buffered output for the by n divided (n = 8 or 10) oscillator frequency
6
Output for the internal reference voltage. This pin is to be blocked with a
ceramic capacitor to ground.
7, 8
The ext. LC circuit between pin 7 and pin 8 determines the oscillator
frequency.
9
Supply voltage. This point is to be blocked to ground for AF and for RF
signals.
10
Buffered output for the oscillator frequency
11
Input for the frequency divider. Low voltage to pin 11 divides the oscillator
frequency by 8, high voltage or open input divides by10.
12
Blocking capacitor for the IF AGC circuit to suppress AF frequencies
13
Input to select the fast or slow AGC time constant
14
Buffered AF output
15
Buffered output for the limited lower IF frequency. This signal is necessary
for an IF Counter Tuning System.
16
Buffered output for the AGC controlled lower IF signal. This pin is connected
to the AM stereo decoder.
17, 18, 19 Input pins for the DC coupled AGC amplifier
20
Open collector output of mixer for the lower IF (~ 450 MHz). A DC
connection to the tank circuit to
V
ref
is recommended.
21, 22
Sym. mixer 2 input for the upper IF (~ 10.7 MHz). Asym. operation is
possible. The input signal is converted to the lower IF corresponding the
equation
f
LIF
=
f
UIF
f
2.LO
.
23, 24
Input for the 2. local oscillator (LO). The pins can be connected via a quartz
or the oscillator is to be forced with an ext. signal.
25
Blocking capacitor for the prestage AGC
26
A capacitor to ground determines the AGC time constant. The DC potential
at this pin can be used for controlling the FET in the ext. prestage.
27, 28
Sym. collector output of the mixer 1. The external tank circuit is tuned to the
upper IF.
TDA 4360X
Semiconductor Group
4
04.96
1.5
Functional Block Diagram
Figure 2
Block Diagram
TDA 4360X
Semiconductor Group
5
04.96
2
Circuit Description
The integrated circuit includes an 2-pin oscillator (1. LO) with sym. input, buffered output
and a double balanced mixer with sym. input. These stages convert the AM input signal
to a 1. IF which is much higher (~ 10 MHz) than the input frequencies. The 1. LO
operates as a LC varactor oscillator in the same 100 MHz range like the FM tuner
oscillator (e.g. TUA 4310X). So the same peripheral elements can be used.
Depending on the signal strength the prestage AGC controls MOSFET prestage
amplifiers.
The 1. IF passes an external selectivity and is then converted in a sym. double balanced
mixer to the 2. IF.
The 2. LO operates as a quartz controlled oscillator or as an amplifier for an external
signal.
The 2. IF signal passes an automatic gain controlled (AGC) IF amplifier and is then
demodulated to the AF in a quasi-synchronous demodulator. The AGC time constant
can be switched with a ratio of 20.
For fine tuning the decoupled 2. IF frequency is available.
The TDA 4360X is prepared to work with a PLL in the 100 MHz range. When applied
with a standard AM-PLL the oscillator frequency divided by 8 or 10 has to be used. In
this case a higher phase noise is to be expected.
TDA 4360X
Semiconductor Group
6
04.96
3
Electrical Characteristics
3.1
Absolute Maximum Ratings
Note: Maximum ratings are absolute ratings; exceeding only one of these values may
cause irreversible damage to the integrated circuit.
T
A
= 40
C to 85
C
Parameter
Symbol
Limit Values
Unit
Remarks
min.
max.
ESD
V
ESD
4
+ 4
kV
HBM
Supply voltage
V
S
0
13.2
V
Mixer 1 output
V
27
,
V
28
0
13.2
V
Mixer 2 output
V
20
0
13.2
V
Mixer 2 input
V
21, 22
0
13.2 V
V
1.5 k
, 100 pF
AGC threshold
V
3
0
5
V
Mixer 1 input
V
1, 2
0
5
V
f
OSC/n
V
5
0
13
V
f
OSC
V
10
0
13
V
Divide by n
V
11
0
5
V
V
Ref
V
6
0
5
V
I
Ref
I
6, 0
0
3
mA
2. LO
V
23, 24
0
5
V
AGC amplifier input
V
17 ... 19
0
5
V
IF counter
V
15
0
13.2
V
AM stereo output
V
16
0
13.2
V
AF output
V
14
0
13.2
V
IF AGC
V
12
0
13.2
V
TDA 4360X
Semiconductor Group
7
04.96
3.2
Operating Range
Note: In the operating range the functions given in the circuit description are fulfilled.
Parameter
Symbol
Limit Values
Unit
min.
max.
Supply voltage
V
S
7.5
13.2
V
Ambient temperature
T
A
40
+ 85
C
3.3
AC/DC Characteristics
V
S
= 10 V,
T
A
= + 25
C,
f
IF1
= 10.7 MHz,
f
IF2
= 456 kHz,
f
i
= 1MHz
Parameter
Symbol
Limit Values
Unit
Test Condition
Test
Circuit
min.
typ.
max.
Current
consumption
I
S
55
mA
Mixer 1
Intercept point
3. order
110
dB
V
V
i
100 mVrms
Mixer gain
5
dB
V
in
= 10 mV,
1.8 k
load
Max. input
voltage
V
i
600
mVpp
Noise figure
(10 MHz)
F
10
dB
1. LO
Frequency
range
f
1.LO
100
140
MHz
Counter output
V
C
100
mVpp
TDA 4360X
Semiconductor Group
8
04.96
Divided
counter output
100
mVpp
Divide by 8
0.7
V
Divide by 10
2.4
V
Output
impedance
R
C
330
Mixer 2
Mixer gain
3
dB
V
in
= 10 mV,
1.5 k
load
Noise figure
F
10
dB
2. LO
Frequency range
f
2.LO
15
MHz
External force
voltage
30
mVrms
Prestage AGC Output
AGC voltage
V
AGC1
5.8
7.2
V
V
DC
= 2 V;
V
i
= 100 mVrms
AGC voltage
V
AGC1
0
0.5
V
V
DC
= 4 V;
V
i
= 100 mVrms
AGC Amplifier
AGC range
66
dB
1
AGC voltage
V
AGC2
2.0
4.8
V
V
18
= 0/100 mVrms 1
Reg. output
voltage
V
IF
30
mVrms
1
Input sensitivity
V
3dB
50
Vrms
1
3.3
AC/DC Characteristics (cont'd)
V
S
= 10 V,
T
A
= + 25
C,
f
IF1
= 10.7 MHz,
f
IF2
= 456 kHz,
f
i
= 1MHz
Parameter
Symbol
Limit Values
Unit
Test Condition
Test
Circuit
min.
typ.
max.
TDA 4360X
Semiconductor Group
9
04.96
Note: The listed characteristics are ensured over the operating range of the integrated
circuit. Typical characteristics specify mean values expected over the production
spread. If not otherwise specified, typical characteristics apply at
T
A
= 25
C and
the given supply voltage.
AGC current
I
AGC
500
A
V
18
= 10 mVrms,
V
13
2.4 V
1
AGC current
I
AGC
25
A
V
18
= 10 mVrms,
V
13
0.7 V
1
Demodulator
AF output voltage
V
Audio
180
mVrms
V
i
= 10 mV, m = 0.3 1
AF output voltage
V
Audio
480
mVrms
V
i
= 10 mV, m = 0.8 1
Total harm.
distortion
k
1
%
V
i
= 10 mV, m = 0.8 1
Input voltage for
S + N/N = 6 dB
V
i
10
Vrms
m = 0.3
1
Input voltage for
S + N/N = 26 dB
V
i
60
Vrms
m = 0.3
1
S + N/N
60
dB
V
i
= 10 mV, m = 0.8 1
AF linearity
V
Audio
3
dB
100
V/100 mV
1
IF Counter
IF counter output
voltage
V
C
100
mVrms
1
3.3
AC/DC Characteristics (cont'd)
V
S
= 10 V,
T
A
= + 25
C,
f
IF1
= 10.7 MHz,
f
IF2
= 456 kHz,
f
i
= 1MHz
Parameter
Symbol
Limit Values
Unit
Test Condition
Test
Circuit
min.
typ.
max.
TDA 4360X
Semiconductor Group
10
04.96
Figure 3
Test Circuit
TDA 4360X
Semiconductor Group
11
04.96
Figure 4
Application Circuit
TDA 4360X
Semiconductor Group
12
04.96
4
Package Outlines
GPS05123
P-DSO-28-1
(Plastic Dual Small Outline Package)
Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book "Package Information".
Dimensions in mm
SMD = Surface Mounted Device
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