TDA2540
TDA2541
IF AMPLIFIER WITH DEMODULATOR AND AFC
August 1992
.
SUPPLY VOLTAGE : 12V TYP
.
SUPPLY CURRENT : 50mA TYP
.
I.F.
INPUT
VOLTAGE
SENSITIVITY
AT
F = 38.9MHz : 85
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
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 :
.
Gain controlled amplifier
.
Synchronous demodulator
.
White spot inverter
.
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)
DIP16
(Plastic Package)
ORDER CODE : TDA2540-TDA2541
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IF INPUT
DECOUPLING CAPACITOR
TUNER AGC TAKE-OVER ADJUST
TUNER AGC OUTPUT
AFC OUTPUT
AFC SWITCH
AFC DEMODULATOR L.C. NETWORK
REFERENCE L.C. NETWORK
IF INPUT
DECOUPLING CAPACITOR
AGC CAPACITOR
GROUND
VIDEO OUTPUT
V
CC
AFC DEMODULATOR L.C. NETWORK
REFERENCE L.C. NETWORK
2540-01.EPS
PIN CONNECTIONS
1/7
2540-02.TIF
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V (1113)
Supply Voltage
13.8
V
V (413)
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
2540-01.TBL
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction - ambient Thermal Resistance
70
C/W
2540-02.TBL
ELECTRICAL OPERATING CHARACTERISTICS
T
amb
= 25
o
C ; V
1113
= 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
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
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
G
V
IF Voltage Gain Control Range
52
64
dB
2540-03.TBL
TDA2540 - TDA2541
2/7
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
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
A
V
5-13
AFC Output Voltage Swing (
f = 100 kHz)
10
11
V
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
2540-04.TBL
Note : 1.
S
N
=
V
O
(
black to white
)
V
N
(
RMS at B
=
5MHz
)
(
dB
)
2540-03.TIF
Figure 1 : Video Output Waveform Showing White Spot and Noise Inverter Threshold Levels
TDA2540 - TDA2541
3/7
2540-04.EPS
Figure 2 : Input Conditions for Intermodulation Measurements
2540-05.TIF
Figure 3 : Test Set-up for Intermodulation
TDA2540 - TDA2541
4/7
2540-07.EPS
Figure 5 : AFC Voltage versus Frequency V
5-13
2540-06.EPS
Figure 4 : AFC Voltage versus Frequency V
5-13
2540-08.EPS
Figure 6 :
Signal/Noise Ratio versus Input
Voltage V
1-16
Figure 7 : AGC Tuner Current Curve
2540-10.EPS
TDA2541
2540-09.EPS
TDA2540
TDA2540 - TDA2541
5/7
2540-11.EPS
TDA2540 - TDA2541
2540-12.EPS
APPLICATION CIRCUIT
Figure 7 : AGC Tuner Current Curve (continued)
TDA2540 - TDA2541
6/7
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
Purchase of I
2
C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips
I
2
C Patent. Rights to use these components in a I
2
C system, is granted provided that the system confo rms to
the I
2
C Standard Specifications as defined by Philips.
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16
1
8
I
a1
L
B
e
D
b
Z
e3
F
b1
E
9
PM-DIP16.EPS
PACKAGE MECHANICAL DATA
16 PINS PLASTIC DIP
Dimensions
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
a1
0.51
0.020
B
0.77
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
i
5.1
0.201
L
3.3
0.130
Z
1.27
0.050
DIP16.TBL
TDA2540 - TDA2541
7/7
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