U2841B TEMIC | Alldatasheet
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Technical content
Features
/C0068IF input provided for operating with ceramic filters /C0068Minimum total harmonic distortion /C0068Low power consumption /C0068Operates alternatively with 5 V or 12 V supply voltage /C0068Demodulator provided for operating with ceramic resonator or coil /C0068SCART AF input / AF output /C0068Wide volume control range /C0068ESD protected Block Diagram V stab2 V stab1 G=2 G=1 V S < 6 V V S > 7 V 2.4 V / 3.7 V AF input demod. signal SCART AF input SCART AF output 56 7 11 k/C0087 47 pF 47 pF Tuned reference circuit 4.7 nF Deemphasis +V S Mute control voltage IF input 1 14 AF output (controlled) 13 11 V olume control SCART switch 93 7519 Figure 1.
Rev. A1, 17-Jul-96 Preliminary Information 2 (9) Pin Description GND 1 V MUTE C 3 Vout 95 11253 Vout V in V in C de Vout, AF V 13 V in, AF (SCART) V SW V in, AF Vout, AF (SCART) V in, IF V S Pin Symbol Function
1 GND Ground
2 V MUTE Mute control voltage
3 C 3 Capacitor
(internal reference voltage) 4, 5 Vout Limiter amplifier output 6, 7 V in Reference circuit (demodulator)
8 C de Deemphasis
9 Vout, AF (SCART) AF output (SCART)
10 V in, AF AF input
(demodulated signal)
11 V SW SCART switch
12 V in, AF (SCART) AF input (SCART)
13 V 13 V olume control
14 Vout, AF AF output, controlled
15 V S Supply voltage
16 V in, IF FM IF input
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/C0042SCART), and via the SCART switch and volume control at Pin 14 (AF output/C0042controlled). The demodulated AF signal at Pin 10 (AF input/C0042demodulator signal) or an external signal at Pin 12 (AF input/C0042SCART) 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 < V S < 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 < V S < 12.5 V: gain of AF output amplifier G = 1.
Rev. A1, 17-Jul-96 3 (9) Absolute Maximum Ratings Reference point Pin 1, unless otherwise specified Parameters Symbol Value Unit Supply voltage Pin 15 V S 12.5 V Supply current Pin 15 IS 33 mA External voltage Pins 2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14 and 16 V ext 5 V External voltage Pin 11 V ext V S V Junction temperature Tj 125 °C Ambient temperature Tamb –25 to +85 °C Storage temperature Tstg –25 to +125 °C Thermal Resistance Parameters Symbol Value Unit Junction ambient R thJA 90 K/W
Electrical Characteristics
Tamb = 25°C, VS = 12 V , reference point Pin 1, unless otherwise specified Parameters Test Conditions / Pins Symbol Min Typ Max Unit Supply voltage Pin 15 V S 4.7 7.0 6.0 12.5 V Supply current V S /C0116 6 V Pin 15 V S /C0117 7 V IS 22 mA IF frequency range Pin 16 fIF 3.5 12 MHz DC output voltage V S /C0116 6 V Pins 9 and 14 V S /C0117 7 V V DC 2.4 3.7 V AF output voltage fmod /C00431 kHz Pins 9 and 14 /C0068f /C0043 /C003430 kHz VAF 600 mV Total harmonic distortionfmod /C00431 kHz Pins 9 and 14 /C0068f /C0043 /C003430 kHz THD 0.5 % Input limiting voltage AF output sign –3 dB Pin 16 V in 150 /C0109V eff AM suppression V in /C0043 20 mV , Pins 4 and 5 f /C0043 5.5 MHz fmod /C0043 1 kHz Reference signal: /C0068 f /C0043/C003430 kHz Test signal: m /C004330% G AM 60 dB Input resistance Pin 16 R in 820 /C0087 Allowable external load resistor, AF output Pins 9 and 14 R L 3 k/C0087 Control range AF volume control V 13 /C00430 /C00424 V Pin 14 A 80 dB Gain between SCART input and controlled AF output V S /C0116 6 V Pins 12 – 14 V S /C0117 7 V G 6 dB
Figure 2. Test circuit
Figure 12. Pin 16: IF input
Rev. A1, 17-Jul-96 9 (9) Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423