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PDF TCA440T Data sheet ( Hoja de datos )
| Número de pieza | TCA440T | |
| Descripción | AM - Receiver Circuit | |
| Fabricantes | ETC | |
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Technical Data
TCA 440 / T
Edition 12/95
AM - Receiver Circuit
Description
This is an efficient bipolar monolithic circuit to apply
in battery - powered or mains - operated radio
receivers up to 30 MHz. It contains controlled RF
stage, mixer, separated oscillator and regulated
multistage IF amplifier.
Features
• symmetrical structured circuitry
• controlled RF prestage
• multiplicative balanced mixer, separated oscillator
• very well implemented large - signal characteristic
begins already from 4.5 V supply voltage
• terminals for indicating instrument
• controlled IF amplifier implementing 60 dB control
range
• external demodulator (diode)
• wide range of supply voltage between 4.5 and 15 V
Package
TCA 440 • DIP 16
≤ 1.27
19.4 ± 0.2
≤ 1.40
6.4
+0.2
- 0.1
12/95
≤ 0.98
2.50
0.47 ±0.12
0.25 M
16 15 14 13 12 11 10
9
1234
56
78
0.27+-00..0079
7.55
7.9 . . . 9.7
1
1 page  
IF suppression
between 1 - 2 and 15
RF input impedance
unbalanced coupling
ViHFmax
ViHFmin
balanced coupling
ViHFmax
ViHFmin
Mixer output impedance
(pin 15 or 16)
Steepness
IF part
Input frequency range
Control range
filF = 455 kHz, ∆VNF = 10 dB
Start of control
(∆ViIF / ∆VNF = 10 dB / 3 dB)
maximum IF input voltage
(THDNF = 10 %)
NF output voltage
applied to 60 Ω
VZF = 30 µV
VZF = 3 mV
VZF = 3 mV; m = 0.3
IF input impedance
(unbanlanced coupling)
IF output impedance
(pin 7)
min typ
max
alF 20
Zi
Zi
Zi
Zi
Zo
SHF
filF
∆GV
VctrlF
VilFmax
2 II 5
2.2 II 1.5
4.5
4.5 II 1.5
250 II 4.5
28
0
62
140
200
2
VNF(rms)
VNF(rms)
VNF(rms)
ZilF
ZO
50
200
70
3 II 3
200 II 8
unit
dB
kΩIIpF
kΩIIpF
kΩ
kΩIIpF
kΩIIpF
mS
MHz
dB
µV
mV
mV
mV
mV
kΩllpF
kΩIIpF
Indication instrument
Recommended indication instruments: 500 µA (Ri = 800 Ω)
300 µA (Ri = 1.5 kΩ)
For indication a voltage source of 600 m V(EMF) and an internal source impedance of 400 Ω is available.
12/95
TCA 440 / T
5
5 Page 
• TCA 440 T
100n
+50%
-20%
S2
47µ ±50%
1.5k ±2%
W2
W1
10n
+50%
-20%
Rp2 1.5n
±2.5%
S3 W1a
330p
±2.5%
W1b
100n
+50%
-20%
4
5
6
~~
VgoHF
RG
2
1
1.8k ±2%
25Ω ≤ RG ≤ 100Ω
20µ
±20%
16 10 12 15
14
TCA 440 T
7
W1
3
8 11
13
9
8.2k
±5%
100n
+50%
-20%
100n
+50%
-20%
S1
4.7µ ±50%
+VCC
A 4.7µ ±50%
x
Rp3
1.5n
±2.5%
12k 3.3n
±2%
+50%
-20%
VAF
100 ±2%
39k ±2%
Application hints
The PCB is to arrange such that there are maximum ground lines (ground area) voltage supply has to be blocked
to ground by a capacitor of 10...100 nF in order to avoid distortions. Blocking should be as close as possible to
the circuit.
The RF circuit has to layout such that 150 mV(rms) oscillator voltage are applied to pin 5. Symmetrically applying
an external oscillator is possible to pin 4 or pin 5. The unused input must be connected to ground via capacitor
and in the same time be connected to supply voltage at pin 6.
It is recommendable to profide off earth connections 1 and 3, because in this way common - mode interferences
more effectively can be suppessed. Single - sided capacitive control of pin 1 and 2 is possible, the unused input
must be connected to ground via capacitor.
Mixer outputs 15 and 16 can be used equivalently.
Load resistances of the mixer (IF selection) at pin 15 respectively pin 16 should run to approximately 7 kΩ.
To avoid saturation of the multiplier the maximum peak voltage occuring during operation should not exceed the
level (VCC - 3 V) IF response to voltage from pin 15 respectively pin 16 to pin 12 should be approximately - 18 dB
that the control characteristics of IF - and RF - part optimally be matched.
Peak voltage at pin 7 occuring during operation should not exceed 2 V that the IF output does not go into
saturation.
All the RF bypass capacitors should amount to 100 nF. Sufficient decoupling of wavemagnet and oscillator coil is
to be taken into consideration.
All components and parts must be carefully proportioned in order to obtain optimum wise characteristics.
Wavemagnets applied should so much mass as possible. The transformation ratio of the input circuitry should run
to 10...12.
In order to improve RF response characteristic a RF preselector can be additionally preceded or the wavemagnet
can be tighty coupled by means of an emitter follower impedance transformer.
Improvement of signal - to - noise ratio at average input voltages can be obtained by delayed control of the RF
part. Control should be start at approximately 1...2 mV.
Reprinting is generally permitted, indicating the source. However, our consent must be obtained in all cases.
SMI reserves the right to make changes in specifications at any time and without notice.
The information and suggestions are given without obligation and cannot given rise to any liability, they do not indicate the
availability of the components mentioned.
The information included herein is believed to be accurate and reliable. However, the SMI assumes no responsibility for its use; nor
for any infringements of patents or of other rights of third parties which may result from its use.
12/95
TCA 440 / T
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TCA440T.PDF ] | |
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