TDA2540.PDF
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IF AMPLIFIER WITH DEMODULATOR AND AFC
TDA2540
TDA2541
IF AMPLIFIER WITH DEMODULATOR AND AFC
.
SUPPLY VOLTAGE : 12V TYP
.
I.F. INPUT VOLTAGE SENSITIVITY AT
F = 38.9MHz : 85
m
V
RMS
TYP
.
VIDEO OUTPUT VOLTAGE (white at 10% of
top synchro) : 2.7V
PP
TYP
.
I.F. VOLTAGE GAIN CONTROL RANGE :
64dB TYP
.
SIGNAL TO NOISE RATIO AT V
I
= 10mV :
58dB TYP
.
A.F.C. OUTPUT VOLTAGE SWING FOR
D
f = 100kHz : 10V TYP
DESCRIPTION
The TDA2540 and 2541 are IF amplifier and A.M.
demodulator circuits for colour and black and white
television receivers using PNP or NPN tuners. They
are intended for reception of negative or positive
modulation CCIR standard.
They incorporate the following functions :
DIP16
(Plastic Package)
.
Synchronous demodulator
ORDER CODE :
TDA2540-TDA2541
.
Video preamplifier with noise protection
.
Switchable AFC
.
AGC with noise gating
.
Tuner AGC output (NPN tuner for 2540)-(PNP
tuner for 2541)
.
VCR switch for video output inhibition (VCR
play back)
PIN CONNECTIONS
IF INPUT
1
16
IF INPUT
DECOUPLING CAPACITOR
2
15
DECOUPLING CAPACITOR
TUNER AGC TAKE-OVER ADJUST
3
14
AGC CAPACITOR
TUNER AGC OUTPUT
4
13
GROUND
AFC OUTPUT
5
12
VIDEO OUTPUT
AFC SWITCH
6
11
V
CC
AFC DEMODULATOR L.C. NETWORK
AFC DEMODULATOR L.C. NETWORK
7
10
REFERENCE L.C. NETWORK
8
9
REFERENCE L.C. NETWORK
August 1992
1/7
.
SUPPLY CURRENT : 50mA TYP
.
Gain controlled amplifier
.
White spot inverter
TDA2540 - TDA2541
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V (11–13) Supply Voltage
13.8
V
V (4–13) Tuner A.G.C. Voltage
12
V
P
tot
Power Dissipation
900
mW
T
stg
Storage Temperature
– 55 to + 125
°
C
T
amb
Operating Ambient Temperature
0 to + 70
°
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction - ambient Thermal Resistance
70
°
C/W
ELECTRICAL OPERATING CHARACTERISTICS
T
amb
=25
o
C;V
11–13
= 12V; f = 38.9MHz (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
11-13
Supply Voltage Range
10.2
12
13.8
V
I
11
Supply Current
50
60
mA
V
1-16
IF Input Voltage Sensitivity
60
85
180
m
V
RMS
Max Input Voltage (Pins 1-16)
140
mV
V
12-13
Video Output Voltage
2.7
V
pp
Z
1-16
Differential Input Impedance (in parallel with 2pF)
2
k
W
V
12-13
Zero Signal Output Level
5.7
6
6.3
V
V
12-13
Top Synchro Output Level
2.9
3.07
3.2
V
D
G
V
IF Voltage Gain Control Range
52
64
dB
2/7
TDA2540 - TDA2541
ELECTRICAL OPERATING CHARACTERISTICS
(continued)
T
amb
=25
C; V (11 – 13) = 12 V; f = 38.9 MHz (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
S/N
Signal to Noise Ratio (V
I
= 10mV) (see note 1)
50
58
dB
B
Bandwidth of Video Amplifier (– 3dB)
6
MHz
dG
Differential Gain
4
10
%
d
f
Differential Phase
2
10
%
V
12-13
Carrier Signal at Video Output (V
I
= 10mV)
4
30
mV
RMS
V
12-13
2nd Harmonic of Carrier at Video Output (V
I
= 10mV)
20
30
mV
RMS
Intermodulation at 1.1MHz (blue) (see Figures 2 and 3)
46
60
dB
Intermodulation at 1.1MHz (yellow) (see Figures 2 and 3)
46
50
dB
Intermodulation at 3.3MHz (blue) (see Figures 2 and 3)
46
54
dB
V
14-13
VCR Switches Off Output at : (VCR = low Level)
1.1
V
White Spot Inverter Threshold Level (see Figure 1)
6.6
V
White Spot Insertion Level (see Figure 1)
4.7
V
Noise Inverter Threshold Level (see Figure 1)
1.8
V
Noise Insertion Level (see Figure 1)
3.8
V
I
4
Tuner AGC output Current Range
0 to 10
mA
V
14-13
Tuner AGC Output Voltage
0.3
V
I
4
Tuner AGC Output Leakage Current
TDA2541 V
14-13
= 11V, V
4-13
= 12V
TDA2540 V
14-13
= 5V, V
4-13
= 12V
15
m
A
D
V
5-13
AFC Output Voltage Swing (
D
f = 100 kHz)
10
11
V
D
f
Change of Frequency at AFC Output (voltage swing of 10V)
100
200
kHz
V
6-13
AFC Switches OFF (AFC = low level) at :
2.5
V
V
6-13
AFC Switches LOW (AFC = High level) at :
3.2
V
V
5-13
AFC Zero = Signal Output Voltage (minimum gain)
4
6
8
V
Note :
1.
S
N
=
V
O
(
black to white
)
V
N
V (
RMS at B
=
5MHz
)
(
dB
)
Figure 1 :
Video Output Waveform Showing White Spot and Noise Inverter Threshold Levels
3/7
°
TDA2540 - TDA2541
Figure 2 :
Input Conditions for Intermodulation Measurements
Figure 3 :
Test Set-up for Intermodulation
4/7
TDA2540 - TDA2541
Figure 4 :
AFC Voltage versus Frequency V
5-13
Figure 5 :
AFC Voltage versus Frequency V
5-13
Figure 6 :
Signal/Noise Ratio versus Input
Voltage V
1-16
Figure 7 : AGC Tuner Current Curve
TDA2540
TDA2541
5/7
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