TDA4360X Datasheet, PDF (3/12 Pages) Siemens Semiconductor Group – Dual Conversion AM Receiver

TDA 4360X
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
21, 22
23, 24
Open collector output of mixer for the lower IF (~ 450 MHz). A DC
connection to the tank circuit to V_ref is recommended.
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.
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.
Semiconductor Group
3
04.96