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TEMIC Semiconductors
TEMIC Semiconductors

U2841B Datasheet Preview

U2841B Datasheet

Monolithic Integrated Circuit

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U2841B pdf
Monolithic Integrated Circuit
U2841B
Description
The integrated circuit, U2841B, is designed as a single
FM-IF-amplifier and demodulator for TV sound
processing with SCART switches and AF control in
bipolar technology.
Features
D IF input provided for operating with ceramic filters
D Minimum total harmonic distortion
D Low power consumption
D Operates alternatively with 5 V or 12 V
supply voltage
D Demodulator provided for operating with
ceramic resonator or coil
D SCART AF input / AF output
D Wide volume control range
D ESD protected
Block Diagram
47 pF
47 pF
Tuned
reference circuit
IF input
93 7519
16
456
7
Mute control 2
voltage
3
2.4 V / 3.7 V
V >7V
G=1 S
+VS 15
Vstab1
Vstab2
G=2
VS < 6 V
1 14
13
AF output (controlled)
Volume control
Figure 1.
Deemphasis
4.7 nF
8
11 kW
SCART
9 AF output
11
SCART switch
10
AF input
12 demod. signal
SCART
AF input
TELEFUNKEN Semiconductors
Rev. A1, 17-Jul-96
Preliminary Information
1 (9)



TEMIC Semiconductors
TEMIC Semiconductors

U2841B Datasheet Preview

U2841B Datasheet

Monolithic Integrated Circuit

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U2841B pdf
U2841B
Pin Description
GND 1
VMUTE 2
C3 3
Vout 4
Vout 5
Vin 6
Vin 7
Cde 8
16 Vin, IF
15 VS
14 Vout, AF
13 V13
12 Vin, AF (SCART)
11 VSW
10 Vin, AF
95 11253
9 Vout, AF (SCART)
Pin Symbol Function
1
GND
Ground
2
VMUTE
Mute control voltage
3 C3 Capacitor
(internal reference voltage)
4, 5 Vout Limiter amplifier output
6, 7 Vin Reference circuit
(demodulator)
8 Cde Deemphasis
9 Vout, AF (SCART) AF output (SCART)
10
Vin, AF
AF input
(demodulated signal)
11
VSW
SCART switch
12 Vin, AF (SCART) AF input (SCART)
13 V13 Volume control
14
Vout, AF
AF output, controlled
15 VS Supply voltage
16
Vin, IF
FM IF input
Circuit Description
The bipolar circuit U2841B contains the complete FM
intercarrier sound processing (mono) with additional AF
volume control, SCART switches and external mute
control. The circuit operates alternatively with 5 V or
12 V supply voltage.
Circuit operation is as follows:
Through an external ceramic bandpass filter, which is
tuned to the sound carrier frequency, the intercarrier
signal is fed via a 9-stage limiting amplifier to the FM
demodulator. This quadrature demodulator works
alternatively with an external L-C reference circuit or
with a ceramic resonator.
*The AF signal is available at Pin 9 (AF output SCART),
and via the SCART switch and volume control at Pin 14
*(AF output controlled). The demodulated AF signal at
*Pin 10 (AF input demodulator signal) or an external
*signal at Pin 12 (AF input SCART) will be selected by
the SCART switch and supplied to the volume control.
In dependence on supply voltage the gain of controlled
AF output (Pin 14) will be switched over:
a) Supply voltage range 4.7 < VS < 6.0 V:
gain of AF output amplifier G = 2.
In this case the AF input signal at Pin 12
(SCART input) must be reduced by an voltage
divider.
b) Supply voltage range 7.0 < VS < 12.5 V:
gain of AF output amplifier G = 1.
2 (9) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 17-Jul-96


Part Number U2841B
Description Monolithic Integrated Circuit
Maker TEMIC Semiconductors
Total Page 9 Pages
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