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TELEFUNKEN Semiconductors
U4240B
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 ESD protected D IF output for stereo demodulator and
stop signal generation
D IF amplifier with gain control D Balanced full-wave detector D Audio preamplifier D Internal AGC voltage D Amplifier for field-strength indication D Electronic standby ON/ OFF switch
D D D D
AF preamplifier with simple filtering Controlled RF preamplifier Double balanced mixer Separate oscillator with amplitude control
Block Diagram
AM-antenna tank 17 (19) 16 (17) AM-oscillator tank 14 (15) 13 (14) 12 (13) 170 W Controlled RF preamplifier 5 kW 5 kW Internal supply voltage Controlled oscillator 150 W 11 (12) 10 (11) 50 W
GND 18 (20)
VS 15 (16)
Indicator driver Balanced mixer Standby switch Controlled IF amplifier Balanced full-wave detector AF amplifier Control voltage amplifier AM-IF output
3.5 kW
7 kW
12 kW
1 (1)
2 (2) IF BPF
3 (4)
4 (5) ( ) SSO 20
5 (6)
6 (7)
7 kW 7 (8)
8 (9)
9 (11)
93 7715 e
Figure 1.
Rev. A1: 12.07.1995
1 (8)
U4240B
Pin Description
DIP 18 1 2 3 4 5 6 7 8 9
93 7721 e
TELEFUNKEN Semiconductors
DIP 20 1 2 4 5 6 7 8, 9 10 11 12 13 14 15 16 17, 19 20 3, 18
Function Mixer output Standby switch IF amplifier input VREF Low pass filtering AF output AGC time constant Low pass filtered AF output IF output Field strength indicator Oscillator output Oscillator tank reference output Oscillator tank input VS RF input GND Not connected
18 17 16 15 U4240B 14 13 12 11 10
1 2 3 4 5 6 7, 8 9 10 11 12 13 14 15 16, 17 18
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 Full-Wave Detector, Pin 5
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.
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.
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.
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 voltage is available at Pin 11 (field strength indication).
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 amplitude controlled IF signal of about 280 mV.
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.
2 (8)
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4240B
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 V mA C C C V
Absolute Maximum Ratings
Reference point Pin 18, unless otherwise specified Parameters Supply voltage Input voltage Pin 15 Pin 2 Pins 16 and 17 Pins 16 and 17 Pins 16 and 17
Input current Ambient temperature range Storage temperature range Junction temperature Electrostatic handling (MIL Standard 883 C) except Pin 10
Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 100 Unit K/W
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 = 25C, 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 Output load current range IoIF/ViRF Pin 14 Pin 14 Pin 14 IL = 0 Pin 13 Pin 13 Pins 16 and 17 Pin 1 Symbol VS IS Vi Ri Ci Ri Ci Vi Ro Co sM fosc ZLosc Vosc Vo -Il 0 500 6.0 6.5 0.6 0.5 130 6 VBE
(4.2V)
Min. 7.5
Typ.
Max. 12
Unit V mA V kW pF kW pF Vpp kW pF mA/V MHz kW mV V
23 VS/2 5.5 25 80 22 2.5
30
60 200 160
20
mA
Rev. A1: 12.07.1995
3 (8)
U4240B
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 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, 1 mA o Pin 2 Symbol VO VO RO IO Vi Ri Ci Vi Vo Ro
TELEFUNKEN Semiconductors
Min. Typ. 320 0.9 170 3 2 3 7 55 280 50 50 310 3.5 12 100 2.5 2.0 2.8 150 6 4 VBE
(2.75)
Max.
Unit mVpp V
W
mAp V kW pF mV mV
2.4
3.9
230
340
DVi
Vo Ro 2.9 9
W
dB mV kW
4.2 15
Vo
mV 3.1 V mA
Output current capability Output resistance Reverse voltage at the output Standby switch Switching voltage Required control voltage Input current
1)
Io Ro Vo VI
W
V V
"I x
AM-ON AM-OFF AM-ON, V2 = 0 AM-OFF, V2 = 12 V 1)
"I
VI VI1) - II
I
2 3.5 200 10
V
mA
or open input
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Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4240B
Operating Conditions
VS = 8.5 V, fiRF = 1 MHz, fmod = 0.4 kHz, m = 30%, Tamb = 25C, 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
Symbol ViRF ViRF
Min.
RF input for AGC operation Control range with ref. to ViRF = 500 mV Maximum RF input voltage
DVoAF = 6 dB
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 Vi = 100 mV
Typ. 1.5 15 150 30 87 0.5 0.7 0.9 310 75 5.5 0.7 0.9 56 4.6 30 60
Max.
Unit
mV mV
dB V mV 9
DViRF
ViRF VoAF ViRF d 2
Audio output voltage 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
mV
% % dB kHz dB
Df = "9 kHz Df = "36 kHz
VS1 47mF
(S+N)/N BIF SIF
Test Circuit
Band switch diodes fosc voIF
50 W RG viRF
12...440 pF 2...22 pF 33 pF RL12 2.2 kW 1 mA 10 nF L 1 95mH 0.1mF R
22 nF
22 W VS2
507 pF 22 W 15 14
+
0.1 mF 18 17 16
L11 11
2.7 kW 10
13
12
U4240B
1 2 3 4 5 6 10 nF 2.2 kW 3.9 nF L2 L3 IF Filter VS2 Figure 2. SFZ 460 A 3.3 nF voAF voAF 56 pF 0.22mF 12 kW C7 2.2mF C8 22mF 0.1mF 7 8 3.3 nF 9
AM
93 7617 e
Rev. A1: 12.07.1995
5 (8)
U4240B
dBV 0
TELEFUNKEN Semiconductors
S+N
VoAF -50 N
-100 0 20 40 60 80 100 dBmV
93 7736 e
viRF
V 3 Vo (pin 11) 2
1
0
0
20
40
60
80
100
dBmV
93 7737 e
viRF
dB 60 S+N N 40 4 S+N N % 6
d
20 0 0 20 40 60 d 80 100 dBmV
2 0
viRF
6 (8)
93 7735 e
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4240B
Package 18 pin DIP plastic SSO 20 plastic
Ordering and Package Information
Extended type number U4240B-A U4240B-AFS
Dimensions in mm
Package: DIP 18
94 8877
Package: SSO 20
95 9943
Rev. A1: 12.07.1995
7 (8)
U4240B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
TELEFUNKEN Semiconductors
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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Rev. A1: 12.07.1995

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