telefunken semiconductors U4240B rev. a1: 12.07.1995 1 (8) 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 esd protected if output for stereo demodulator and stop signal generation af preamplifier with simple filtering controlled rf preamplifier double balanced mixer separate oscillator with amplitude control if amplifier with gain control balanced full-wave detector audio preamplifier internal agc voltage amplifier for field-strength indication electronic standby on/ off switch block diagram 50 preamplifier balanced standby if amplifier full-wave amplifier amplifier controlled am-antenna tank am-oscillator tank if bpf mixer switch controlled balanced detector control voltage af rf internal supply voltage controlled oscillator am-if output driver indicator 5 (6) 6 (7) 7 (8) 8 (9) 9 (11) 4 (5) 3 (4) 2 (2) 1 (1) 18 (20) 17 (19) 16 (17) 14 (15) 13 (14) 12 (13) 11 (12) 10 (11) 15 (16) gnd v s 5 k 5 k 7 k 7 k 3.5 k 12 k 170 150 93 7715 e ( ) sso 20 figure 1.
telefunken semiconductors U4240B rev. a1: 12.07.1995 2 (8) pin description 18 10 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 U4240B 93 7721 e dip 18 dip 20 function 1 1 mixer output 2 2 standby switch 3 4 if amplifier input 4 5 v ref 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 15 16 v s 16, 17 17, 19 rf input 18 20 gnd 3, 18 not connected controlled rf preamplifier, pin 7 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. 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 the if amplifier consists of two controlled gain cells coupled by capacitive means. internal band pass filtering reduces higher order products and thd. am-if output, pin 10 for am stereo application and for stop signal generation by if counting pin 10 provides a non limited but ampli- tude controlled if signal of about 280 mv. balanced full-wave detector, pin 5 the detector consists of a gilbert cell that multiplies the limited carrier signal with the if output signal and there- fore employs a full wave rectification. second or higher order products at the output are internally low pass filtered. 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 k output resistor to support a second order low pass filter. pin 9 provides additional 12 k for a simple first order low pass filter. agc, pin 8 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 volt- age is available at pin 11 (field strength indication). standby switch, pin 2 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.
telefunken semiconductors U4240B rev. a1: 12.07.1995 3 (8) absolute maximum ratings reference point pin 18, unless otherwise specified parameters symbol value unit supply voltage pin 15 v s 12 v input voltage pin 2 pins 16 and 17 pins 16 and 17 v 2 iv 1617 i v 16, v 17 12 12 vs v input current pins 16 and 17 i 16, i 17 200 ma ambient temperature range t amb 30 to +85 c storage temperature range t stg 55 to +150 c junction temperature t j 125 c electrostatic handling (mil standard 883 c) except pin 10 v esd 2000 v thermal resistance parameters symbol value unit junction ambient r thja 100 k/w electrical characteristics v s = 8.5 v, reference point pin 18, f irf = 1 mhz, r g = 50 , f mod = 0.4 khz, m = 30%, f if = 460 khz, t amb = 25 c, unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit supply pin 15 supply voltage v s 7.5 12 v supply current without load: i l = 0 (pin 13) i s 23 30 ma rf preamplifier dc input voltages pins 16 and 17 v i v s /2 v input impedance v irf < 300 v, pins 16, 17 v irf > 10 mv pins 16, 17 r i c i r i c i 5.5 25 80 22 k pf k pf maximum rf input voltage pins 16 and 17 v i 2.5 v pp mixer output pin 1 output impedance r o c o 500 6.0 k pf conversion conductance i oif /v irf s m 6.5 ma/v oscillator frequency range pin 14 f osc 0.6 60 mhz oscillator circuit impedance range pin 14 z losc 0.5 200 k controlled oscillator amplitude pin 14 v osc 130 160 mv dc output voltage i l = 0 pin 13 v o 6 v be (4.2v) v output load current range pin 13 i l 0 20 ma
telefunken semiconductors U4240B rev. a1: 12.07.1995 4 (8) unit max. typ. min. symbol test conditions / pins parameters oscillator frequency output, r l10 = 2.2 k pin 12 output voltage v o 320 mv pp dc output voltage v o 0.9 v output resistance r o 170 output current i o 3 ma p if amplifier and demodulator dc input voltages pins 3 and 4 v i 2 v input impedance pins 3 r i c i 2.4 3 7 3.9 k pf maximum if input voltage m = 80%, d = 3%, pin 3 v i 55 mv if output voltage, without load v i = 10 mv (pin 3/4) pin 10 v o 230 280 340 mv if output resistance pin 10 r o 50 control range v oaf = 6 db v i 50 db audio output voltage, without load v i = 1 mv (pin 3/4) pins 6 and 9 v o 310 mv audio output resistance pin 6 pin 9 r o 2.9 9 3.5 12 4.2 15 k field strength indication pin 11 dc indicator voltages r l11 = 2.7 k , v i = 0 r l11 = 2.7 k , v i = 500 mv v o 2.5 100 2.8 3.1 mv v output current capability i o 2.0 ma output resistance i o = 0.5 ma r o 150 reverse voltage at the output am switch off, i o 1 a v o 6 v standby switch pin 2 switching voltage v i 4 v be (2.75) v required control voltage am-on am-off v i v i 1) 3.5 2 v input current am-on, v 2 = 0 am-off, v 2 = 12 v 1) i i i i 200 10 a 1) or open input
telefunken semiconductors U4240B rev. a1: 12.07.1995 5 (8) operating conditions v s = 8.5 v, f irf = 1 mhz, f mod = 0.4 khz, m = 30%, t amb = 25 c, reference point pin 18 (fig. 2) unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit rf input voltage (s+n)/n = 6 db = 26 db = 46 db v irf 1.5 15 150 v rf input for agc operation v irf 30 v control range with ref. to v irf = 500 mv v oaf = 6 db v irf 87 db maximum rf input voltage d = 3%, m = 80% d = 3%, m = 30% d = 10%, m = 30% v irf 0.5 0.7 0.9 v audio output voltage v i = 1 mv pin 6 v i = 4 v, m = 0.8 v oaf 310 75 mv rf input voltage v oaf = 60 mv v irf 2 5.5 9 v total distortion of audio output voltage m = 80%, v i = 1 mv m = 30%, v i = 500 mv d 0.7 0.9 % % signal plus noise to noise ratio of audio output voltage v i = 100 mv (s+n)/n 56 db if bandwidth ( 3 db) b if 4.6 khz if selectivity f = 9 khz f = 36 khz s if 30 60 db test circuit 14 22 1 l 95 h 33 pf band switch diodes 2...22 pf r l12 2.2 k 10 nf 13 12 0.1 f 11 r l11 2.7 k 1 ma f osc v oif 10 507 pf 12...440 pf 22 v s1 s2 v 50 16 15 0.1 f 17 18 v irf 22 nf 1 3.9 nf l 2 3 l 2.2 k 56 pf if filter sfz 460 a s2 v am 23 4 5 6 10 nf 3.3 nf v oaf 2.2 f 3.3 nf v oaf 78 9 c 7 22 f c 8 0.1 f U4240B 93 7617 e 0.22 f 47 f + r g 12 k figure 2.
telefunken semiconductors U4240B rev. a1: 12.07.1995 6 (8) 0 2040 6080100 db v v irf s + n n 100 0 50 dbv v oaf 93 7736 e 0 20 40 60 80 100 db v v irf 0 1 2 3 v v o (pin 11) 93 7737 e 0 20 40 60 80 100 db v 0 2 4 6 % 0 20 40 60 db d s + n n s + n n d v irf 93 7735 e
telefunken semiconductors U4240B rev. a1: 12.07.1995 7 (8) ordering and package information extended type number package U4240B-a 18 pin dip plastic U4240B-afs sso 20 plastic dimensions in mm package: dip 18 94 8877 package: sso 20 95 9943
telefunken semiconductors U4240B rev. a1: 12.07.1995 8 (8) 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
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