Datasheet TDA4360X Datasheet (Siemens)

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

P-DSO-28-1

Type Ordering Code Package

TDA 4360X Q67000-A5181 P-DSO-28-1

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.

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1.3 Pin Configuration

(top view)

TDA 4360X

P-DSO-28-1

Figure 1

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1.4 Pin Definitions and Functions

Pin No. Function

TDA 4360X

1, 2

3
4
5
6

7, 8

9

10
11

12
13

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

DC voltage alters the threshold voltage of the prestage AGC circuit.
GROUND: All DC values are referred to this pin
Buffered output for the by n divided (n = 8 or 10) oscillator frequency
Output for the internal reference voltage. This pin is to be blocked with a

ceramic capacitor to ground.
The ext. LC circuit between pin 7 and pin 8 determines the oscillator

frequency.
Supply voltage. This point is to be blocked to ground for AF and for RF

signals.
Buffered output for the oscillator frequency

Input for the frequency divider. Low voltage to pin 11 divides the oscillator
frequency by 8, high voltage or open input divides by10.

Blocking capacitor for the IF AGC circuit to suppress AF frequencies

Input to select the fast or slow AGC time constant
14
15

16

17, 18, 19
20

21, 22

23, 24

25
26

27, 28

Buffered AF output

Buffered output for the limited lower IF frequency. This signal is necessary

for an IF Counter Tuning System.

Buffered output for the AGC controlled lower IF signal. This pin is connected

to the AM stereo decoder.

Input pins for the DC coupled AGC amplifier

Open collector output of mixer for the lower IF (~ 450 MHz). A DC

connection to the tank circuit to

V

is recommended.

ref

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

.

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.

Blocking capacitor for the prestage AGC

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.

Sym. collector output of the mixer 1. The external tank circuit is tuned to the

upper IF.

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1.5 Functional Block Diagram

TDA 4360X

Figure 2
Block Diagram

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TDA 4360X

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.

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TDA 4360X

3 Electrical Characteristics

3.1 Absolute Maximum Ratings

T

= – 40 °C to 85 °C

A

Parameter Symbol Limit Values Unit Remarks

min. max.

ESD
Supply voltage
Mixer 1 output
Mixer 2 output
Mixer 2 input
AGC threshold
Mixer 1 input

f

OSC/n

f

OSC

Divide by n

V

Ref

I

Ref

2. LO
AGC amplifier input
IF counter

V

ESD

V

S

V

27

V

20

V

21, 22

V

3

V

1, 2

V

5

V

10

V

11

V

6

I

6, 0

V

23, 24

V

17 … 19

V

15

, V

28

– 4 + 4 kV HBM
0 13.2 V
0 13.2 V
0 13.2 V
0 13.2 V V 1.5 kΩ, 100 pF
05 V
05 V
013 V
013 V
05 V
05 V
03 mA
05 V
05 V

0 13.2 V
AM stereo output
AF output
IF AGC

V
V
V

16

14

12

0 13.2 V

0 13.2 V

0 13.2 V

Note: Maximum ratings are absolute ratings; exceeding only one of these values may

cause irreversible damage to the integrated circuit.

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TDA 4360X

3.2 Operating Range
Parameter Symbol Limit Values Unit

min. max.

Supply voltage
Ambient temperature

V
T

S

A

7.5 13.2 V
– 40 + 85 °C

Note: In the operating range the functions given in the circuit description are fulfilled.

3.3 AC/DC Characteristics

V

= 10 V, TA = + 25 °C, f

S

= 10.7 MHz, f

IF1

= 456 kHz, fi = 1MHz

IF2

Parameter Symbol Limit Values Unit Test Condition Test

Circuit

Current

min. typ. max.

I

S

55 mA

consumption

Mixer 1

V

Intercept point

110 dBµV

≥ 100 mVrms

i

3. order
Mixer gain 5 dB

Max. input

V

i

600 mVpp

voltage
Noise figure

F

10 dB

(10 MHz)

1. LO

Frequency

f

1.LO

100 140 MHz

range
Counter output

V

C

100 mVpp

V

= 10 mV,

in

1.8 kΩ load

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TDA 4360X

3.3 AC/DC Characteristics (cont’d)

V

= 10 V, TA = + 25 °C, f

S

Parameter Symbol Limit Values Unit Test Condition Test

= 10.7 MHz, f

IF1

min. typ. max.

= 456 kHz, fi = 1MHz

IF2

Circuit

Divided

100 mVpp

counter output
Divide by 8 0.7 V
Divide by 10 2.4 V
Output

R

C

330 Ω

impedance

Mixer 2

Mixer gain 3 dB

Noise figure F 10 dB

2. LO

Frequency range
External force

f

2.LO

15 MHz
30 mVrms

voltage

V

= 10 mV,

in

1.5 kΩ load

Prestage AGC Output

AGC voltage

AGC voltage

V

V

AGC1

AGC1

5.8 7.2 V VDC = 2 V;

V

= 100 mVrms

i

0 0.5 V VDC = 4 V;

V

= 100 mVrms

i

AGC Amplifier

AGC range 66 dB 1
AGC voltage
Reg. output

V
V

AGC2

IF

2.0 4.8 V V18 = 0/100 mVrms 1
30 mVrms 1

voltage
Input sensitivity

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V

– 3dB

50 µVrms 1

TDA 4360X

3.3 AC/DC Characteristics (cont’d)

V

= 10 V, TA = + 25 °C, f

S

Parameter Symbol Limit Values Unit Test Condition Test

= 10.7 MHz, f

IF1

min. typ. max.

= 456 kHz, fi = 1MHz

IF2

Circuit

AGC current I

AGC current

I

AGC

AGC

– 500 µA V18 = 10 mVrms,

– 25 µA V18 = 10 mVrms,

Demodulator

AF output voltage
AF output voltage
Total harm.

V

Audio

V

Audio

k1%

180 mVrms Vi = 10 mV, m = 0.3 1
480 mVrms Vi = 10 mV, m = 0.8 1

distortion
Input voltage for

V

i

10 µVrms m = 0.3 1

S + N/N = 6 dB
Input voltage for

V

i

60 µVrms m = 0.3 1

S + N/N = 26 dB
S + N/N 60 dB
AF linearity ∆

V

Audio

3 dB 100 µV/100 mV 1

V

≥ 2.4 V

13

V

≤ 0.7 V

13

V

= 10 mV, m = 0.8 1

i

V

= 10 mV, m = 0.8 1

i

1

1

IF Counter

IF counter output

V

C

100 mVrms 1

voltage

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

= 25°C and

A

the given supply voltage.

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TDA 4360X

Figure 3
Test Circuit

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TDA 4360X

Figure 4
Application Circuit

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4 Package Outlines

P-DSO-28-1

(Plastic Dual Small Outline Package)

TDA 4360X

Sorts of Packing

Package outlines for tubes, trays etc. are contained in our
Data Book “Package Information”.

SMD = Surface Mounted Device

GPS05123

Dimensions in mm

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