U4240B TELEFUNKEN Semiconductors AM-Receiver Description The U4240B is a bipolar integrated AM receiver circuit. It performs all the active functions and part of the filtering required of the AM radio receiver. The device is designed for car radio and home receiver applications. Features D IF amplifier with gain control D ESD protected D IF output for stereo demodulator and D Balanced full-wave detector stop signal generation D D D D D Audio preamplifier AF preamplifier with simple filtering Controlled RF preamplifier D Internal AGC voltage Double balanced mixer D Amplifier for field-strength indication Separate oscillator with amplitude control D Electronic standby ON/ OFF switch Block Diagram GND 18 (20) AM-antenna tank 17 (19) VS 15 (16) 16 (17) AM-oscillator tank 14 (15) 13 (14) 12 (13) 170 W Controlled RF preamplifier 5 kW 150 W 10 (11) 50 W Controlled oscillator Internal supply voltage 5 kW 11 (12) Indicator driver Balanced mixer Standby switch Controlled IF amplifier Balanced full-wave detector AF amplifier 3.5 kW 1 (1) 2 (2) IF BPF 3 (4) 4 (5) 5 (6) ( ) SSO 20 Control voltage amplifier 7 kW 6 (7) 7 kW 7 (8) AM-IF output 12 kW 8 (9) 9 (11) 93 7715 e Figure 1. Rev. A1: 12.07.1995 1 (8) U4240B TELEFUNKEN Semiconductors Pin Description 1 18 2 17 3 16 4 15 5 14 U4240B 6 13 7 12 8 11 9 10 93 7721 e DIP 18 DIP 20 Function 1 1 Mixer output 2 2 Standby switch 3 4 IF amplifier input 4 5 VREF 5 6 Low pass filtering 6 7 AF output 7, 8 8, 9 AGC time constant 9 10 Low pass filtered AF output 10 11 IF output 11 12 Field strength indicator 12 13 Oscillator output 13 14 Oscillator tank reference output 14 15 Oscillator tank input VS 15 16 16, 17 17, 19 18 20 3, 18 RF input GND Not connected Controlled RF Preamplifier, Pin 7 Balanced Full-Wave Detector, Pin 5 The RF preamplifier is built up differentially in order to achieve the best possible large signal handling capability. Special care was taken to reduce the input stage noise. The detector consists of a Gilbert cell that multiplies the limited carrier signal with the IF output signal and therefore employs a full wave rectification. Second or higher order products at the output are internally low pass filtered. Balanced Mixer, Pin 1 The mixer is a double balanced type with a single ended output. Controlled Oscillator, Pins 13 and 14 The oscillator employs temperature compensation, simple varicap and coil connection. The amplitude of the oscillator is controlled to low values, in order to support AM varactor diodes. The LO-buffer supports the U428xBM PLL-family. Controlled IF Amplifier, Pin 3 AF Amplifier, Pin 6 The AF amplifier has two different outputs. They provide different output resistances for simplifying applications. For a high end application Pin 6 provides a 3.5 kW output resistor to support a second order low pass filter. Pin 9 provides additional 12 kW for a simple first order low pass filter. AGC, Pin 8 The IF amplifier consists of two controlled gain cells coupled by capacitive means. Internal band pass filtering reduces higher order products and THD. The AGC block generates the AGC voltage that is to be smoothed at Pin 8. The capacitor at Pin 8 defines the time constant. The voltage at Pin 8 is buffered to control the internal gain stages with different delay. The control voltage is available at Pin 11 (field strength indication). AM-IF Output, Pin 10 Standby Switch, Pin 2 For AM stereo application and for stop signal generation by IF counting Pin 10 provides a non limited but amplitude controlled IF signal of about 280 mV. The whole circuit can be powered down by the standby switch. This mode can be achieved by a dc voltage higher than 3.5 V at Pin 2. 2 (8) Rev. A1: 12.07.1995 U4240B TELEFUNKEN Semiconductors Absolute Maximum Ratings Reference point Pin 18, unless otherwise specified Parameters Supply voltage Input voltage Input current Ambient temperature range Storage temperature range Junction temperature Electrostatic handling (MIL Standard 883 C) except Pin 10 Pin 15 Pin 2 Pins 16 and 17 Pins 16 and 17 Pins 16 and 17 Symbol VS V2 IV16–17I V16, V17 I16, I17 Tamb Tstg Tj ±VESD Value 12 12 12 VS 200 –30 to +85 –55 to +150 125 2000 Unit V Symbol RthJA Value 100 Unit K/W V mA °C °C °C V Thermal Resistance Parameters Junction ambient Electrical Characteristics VS = 8.5 V, reference point Pin 18, fiRF = 1 MHz, RG = 50 W, fmod = 0.4 kHz, m = 30%, fIF = 460 kHz, Tamb = 25°C, unless otherwise specified Parameters Supply Supply voltage Supply current RF preamplifier DC input voltages Input impedance Test Conditions / Pins Pin 15 without load: IL = 0 (Pin 13) Pins 16 and 17 ViRF < 300 mV, Pins 16, 17 ViRF > 10 mV Pins 16, 17 Maximum RF input voltage Mixer output Output impedance Conversion conductance Oscillator Frequency range Oscillator circuit impedance range Controlled oscillator amplitude DC output voltage Pins 16 and 17 Pin 1 Min. VS 7.5 Typ. Max. Unit 12 V 30 mA IS 23 Vi Ri Ci Ri Ci Vi VS/2 5.5 25 80 22 2.5 V kW pF kW pF Vpp 6.0 6.5 kW pF mA/V 60 200 MHz kW 160 mV Ro Co sM 500 Pin 14 Pin 14 fosc ZLosc 0.6 0.5 Pin 14 Vosc 130 Pin 13 Vo 6 VBE IoIF/ViRF IL = 0 Symbol V (4.2V) Output load current range Rev. A1: 12.07.1995 Pin 13 –Il 0 20 mA 3 (8) U4240B TELEFUNKEN Semiconductors Parameters Test Conditions / Pins Oscillator frequency output, RL10 = 2.2 kW Pin 12 Output voltage DC output voltage Output resistance Output current IF amplifier and demodulator DC input voltages Pins 3 and 4 Input impedance Pins 3 Maximum IF input voltage IF output voltage, without load IF output resistance Control range Audio output voltage, without load Audio output resistance Field strength indication DC indicator voltages Output current capability Output resistance Reverse voltage at the output Standby switch Switching voltage m = 80%, d = 3%, Pin 3 Vi = 10 mV (Pin 3/4) Pin 10 Pin 10 DVoAF = 6 dB Vi = 1 mV (Pin 3/4) Pins 6 and 9 Pin 6 Pin 9 Pin 11 RL11 = 2.7 kW, Vi = 0 RL11 = 2.7 kW, Vi = 500 mV – Io = 0.5 mA AM switch OFF, I o 1 mA Pin 2 " x Symbol Min. Typ. VO VO RO IO 320 0.9 170 Vi Ri Ci Vi 2 3 7 55 Vo Ro DVi Vo Ro 2.4 230 2.9 9 280 50 50 310 3.5 12 W 3.9 340 2.8 mAp V kW pF mV mV W dB 4.2 15 100 2.5 2.0 Unit mVpp V 3 Vo Io Ro Max. mV kW mV 3.1 V mA 150 W Vo 6 V VI 4 VBE V (2.75) Required control voltage Input current 1) 4 (8) AM-ON AM-OFF AM-ON, V2 = 0 AM-OFF, V2 = 12 V 1) VI VI1) – II II " 2 3.5 200 10 V mA or open input Rev. A1: 12.07.1995 U4240B TELEFUNKEN Semiconductors Operating Conditions VS = 8.5 V, fiRF = 1 MHz, fmod = 0.4 kHz, m = 30%, Tamb = 25°C, reference point Pin 18 (fig. 2) unless otherwise specified Parameters RF input voltage Test Conditions / Pins (S+N)/N = 6 dB = 26 dB = 46 dB RF input for AGC operation Control range with ref. to ViRF = 500 mV Maximum RF input voltage Symbol ViRF DViRF d = 3%, m = 80% d = 3%, m = 30% d = 10%, m = 30% Vi = 1 mV Pin 6 Vi = 4 mV, m = 0.8 VoAF = 60 mV m = 80%, Vi = 1 mV m = 30%, Vi = 500 mV RF input voltage Total distortion of audio output voltage Signal plus noise to noise ratio of audio output voltage IF bandwidth ( – 3 dB) IF selectivity Typ. 1.5 15 150 30 ViRF DVoAF = 6 dB Audio output voltage Min. VoAF Vi = 100 mV 2 (S+N)/N BIF SIF 56 4.6 30 60 Band switch diodes fosc Df = "9 kHz Df = "36 kHz Unit mV mV 87 0.5 0.7 0.9 310 75 5.5 0.7 0.9 ViRF ViRF d Max. dB V mV mV 9 % % dB kHz dB Test Circuit VS1 47mF 50 W 12...440 pF 2...22 pF 22 W 0.1 mF 18 17 16 0.1mF 13 14 15 1 mA 10 nF L 1 95mH 22 W 22 nF 2.2 kW 507 pF VS2 + RL12 33 pF viRF RG voIF R 12 2.7 kW L11 10 11 U4240B 1 2 3 4 5 6 7 8 10 nF AM 2.2 kW 3.9 nF L2 93 7617 e L3 IF Filter 56 pF 0.22mF SFZ 460 A 12 kW 9 3.3 nF C7 C8 2.2mF 22mF 0.1mF 3.3 nF VS2 voAF voAF Figure 2. Rev. A1: 12.07.1995 5 (8) U4240B TELEFUNKEN Semiconductors dBV 0 S+N VoAF –50 N –100 0 20 40 60 80 100 dBmV viRF 93 7736 e V 3 Vo (pin 11) 2 1 0 0 20 40 60 80 100 dBmV viRF 93 7737 e % dB S+N N 60 6 d S+N N 40 4 20 2 d 0 0 20 40 60 viRF 6 (8) 80 100 dBmV 0 93 7735 e Rev. A1: 12.07.1995 U4240B TELEFUNKEN Semiconductors Ordering and Package Information Extended type number U4240B-A U4240B-AFS Package 18 pin DIP plastic SSO 20 plastic Dimensions in mm Package: DIP 18 94 8877 Package: SSO 20 95 9943 Rev. A1: 12.07.1995 7 (8) U4240B TELEFUNKEN Semiconductors 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 8 (8) Rev. A1: 12.07.1995