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TELEFUNKEN Semiconductors
U4311B
Low-Current Superhet Remote Control Receiver
Description
The U4311B is a monolithic Integrated Circuit in bipolar technology for low-current UHF remote control superheterodyne receivers in amplitude- or frequencymodulated mode. Typical applications are keyless car lock-, alarm or telecontrol remote indication systems. Especially for automotive applications it supports a superhet design with about 1 mA total current consumption, as required by the car manufacturers.
Features
D Usable for amplitude- and frequency- modulated
transmission systems
D Extremely low quiescent current approximately 1 mA
in the stand-by mode due to wake-up concept
D Wide power supply voltage range 3 to 13 V D Sensitive IF-amplifier for 10.7 MHz operating
frequency
D D D D
Logarithmic AM demodulator FM demodulator Monoflop exit to wake up a microcontroller High performance operational amplifier to realize a data recovering filter depending hysteresis for data regeneration
D Non-inverting clamping comparator with amplitude-
Block Diagram
Wake up out
VS 10 VRef = 2.4V 13 Bandgap 11 Internal VRef = 2.4 V Monoflop RF Level Wake up Non - invert. clamping comparator 3 7 6 5 Data out
10.7 MHz 9 IF amplifier Quadrature detector - 4 8 log AM out 12 14 FM out Data filter 16 Operational amplifier + 1
95 9968
2
10.7 MHz
Figure 1. Block diagram
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U4311B
Pin Description
OPin+ OPout RCwake GND2 Compout RC- RC+ AMout 1 2 3 4 5 6 7 8
95 10322
TELEFUNKEN Semiconductors
16 OPin- 15 VS 14 FMout 13 VRef 12 Discr 11 GND1 10 SWout 9 IFin
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Symbol OPin+ OPout RCwake GND2 Compout RC- RC+ AMout IFin SWout GND1 Discr Vref FMout VS OPin-
Function OP amplifier non inverted input OP amplifier output RC wake up reset time Ground of the logical circuits Comparator output Comparator time constant Comparator time constant AM current output IF input Wake up output Ground of the analog circuits FM discriminator tank Reference voltage FM discriminator output Supply voltage OP amplifier inverted input
Internal connections see figures 4 to 19
Figure 2. Pin description
Absolute Maximum Ratings
Parameters Supply voltage Power dissipation Tamb = 85C Junction temperature Ambient temperature Storage temperature Symbol VS Ptot Tj Tamb Tstg Value 13 400 125 -40 to +85 -55 to +125 Unit V mW C C C
Thermal Resistance
Junction ambient Parameters DIP16 SO16L Symbol RthJA RthJA Value 120 100 Unit K/W K/W
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TELEFUNKEN Semiconductors
U4311B
Electrical Characteristics
VS = 5 V, Tamb = 25C, fin = 10.7 MHz; FM part: fmod = 1 kHz, fdev = 22.5 kHz; AM part: fmod = 1 kHz, m = 100% unless otherwise specified Parameters Characteristics Supply voltage range Quiescent supply current Active supply current Bandgap Regulated voltage Output current Source resistance External capacitor Power supply rejection ratio IF amplifier Input resistance Input capacitance Typical internal 3 dB frequency -3 dB limiting point Recovered data voltage FM detector output resistance AM rejection ratio Maximum AM input voltage AM quiescent current Maximum AM current Operational amplifier Gain bandwidth product Excess phase Open loop gain Output voltage range Common mode input voltage Input offset voltage Maximum output current Common mode rejection ratio Total harmonic distortion Power supply rejection ratio Test Conditions / Pins Pin 15 Pin 15 Pin 15 Pin 13 Pin 13 Pin 13 Pin 13 Pin 13 Symbol VS Iq Iact Vref Iref Rref Cref psrr Min. 3 1 2.8 2.3 2.4 2.3 10 60 Typ. Max. 12 1.3 3.6 2.5 5 5 Unit V mA mA V mA
W mF W
f = 50 Hz
dB
Pin 9 Pin 9 IF level 70 dBmV Pins 9 and 14 Pin 9 Pin 14 Pin 14 m = 30% Pins 9 and 14 Pin 9 Pin 8 Pin 8 Pins 1, 2 and 16 Pins 1, 2 and 16 Pins 1, 2 and 16 Pin 2 Pins 1 and 16 Pins 1 and 16 Pin 2 Pin 1 and 16 Vin < 300 mV, f = 33 kHz, unity gain circuit Pin 2 f = 50 Hz Pin 2
Rin Cin f3dB VFM3dB VFMout RFMout AMrr VAMmax IAMout IAMoutmax ft
180 8
330 5
520 12
pF MHz dBmV mV kW dB dBmV
50
30 130 50 25 90
230
10
22 100 4 80 70 1.55
37
mA mA
MHz degree dB V V mV mA dB % dB
d
3 50 0.7 -2.5 65
6.5 95 1.7
g0 Vout Vin Vos Iout cmrr thd psrr
0 85 1
+2.5 5
3
65
85
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U4311B
Parameters Clamping comparator Typical common mode input voltage range Maximum distortion voltage Test Conditions / Pins Pin 2 Vsignal = 100 mV, R+ = R- = 50 kW, C+ = C- = 200 nF, fdisto = 50 Hz, Pin 2 fsignal = 1 kHz V2 > (V6 + V7) /2 (10 kW load to VRef) Pin 5 V2 < (V6 + V7 ) /2 (10 kW load to VRef) Pin 5 Pin 9 Pin 3 Pin 3 Pin 10 Pin 10 Pins 3 and 13 Pins 3 and 13 Symbol Vcmvr Vdmax
TELEFUNKEN Semiconductors
Min. 0.8 Typ. Max. 1.6 200 Unit V mV
Output voltage
Vcout
VRef
1)
Output voltage
Vcout
0
150
250
mV
Wake up circuit Minimum wake up level Internal charging resistor Threshold voltage Output switch current Output switch voltage External wake up resistor External wake up capacitor Hold time ( 30%) Delay time ( 30%) 1) 2) 3) 4) Measured at Pin 9, referred to 330 W
Vin Rint Vth ISW VSW RWU CWU th td
180 22
40 1.5 1.6 250
dBmV2) kW V 550 5.5 10 V 3) kW s 4) s 4)
mA mF
1.5 RWU CWU CWU 0.75 kW
IC version with inverting comparator available: U4313B
Protected by a Z-diode, see figure 13 Valid for 0.1 mF CWU 10 mF and 22 kW RWU 680 kW
Application
The U4311B is well-suited to implement UHF remote control or data transmission systems, based on a lowcurrent superheterodyne receiver concept. SAW-devices may be used in the transmitter as well as in the receiver local oscillator. The front end should be a discrete circuit application with low current UHF-transistors like S822T or S852T from TEMIC TELEFUNKEN microelectronic GmbH. The frequency of the local oscillator can be determined either by coaxial resonators or SAW-devices. Due to large SAW-resonator tolerance an IF-bandwidth and in a FM-system additionally the discriminator amplitude characteristic (figure 28) of 300 kHz or higher is proposed. As the circuit needs only 3.0 V supply voltage for operation the front end may be a stacked design in order to achieve a total receiver current consumption of approximately 1 mA. Figure 29 shows a principle receiver concept diagram. The application notes ANT012, ANT013, and ANT015 contain more detailed information on complete RF links.
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*
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TELEFUNKEN Semiconductors
U4311B
pin 10 and can be used to wake up a microcontroller. After an adjustable reset time, determined by the monoflop time constant, the integrated circuit rests down to the sleep mode. In this case typically 1 mA supply current is required. An external resistor matched at pin 3 to ground blocks the wake-up circuit and gives fully function at lower IF-level as to recognize in figures 24 and 27, but supply current increases up to typically 2.8 mA. Function of the clamping comparator The output signal of the operational amplifier is fed to the input of the non-inverting comparator and two peak detectors (Q1 and Q2, figure 3). Their time constants are distinguished by RC+ and RC-. The components value must be adapted to the transmission code. The time constant should be large compared to the bit-rate for optimized noise and hum suppression. To compensate the input transistors base-emitter-voltage differences these two signals are buffered by Q3 and Q4. The mean value is used as comparator threshold, the difference of the peak values controls the hysteresis. This clamping comparator works as a data regenerator. Another version of the IC, with an inverting clamping comparator, is also available (U4313B). Therefore the operational amplifier can be used either as a noninverting or an inverting filter without the need of any additional components.
VRef
Circuit Description
General functions The integrated circuit U4311B includes the following functions: IF-amplifier, FM-demodulator, wake-up circuit with monoflop, operational-amplifier, noninverting data comparator and voltage-regulator. The 10.7 MHz IF-signal from the front end passes the integrated IF-amplifier which operates for amplitude- or frequency-modulated signals to either a logarithmic AMdemodulator which was implemented to avoid settling time problems effected by use of an automatic gain control system or a quadrature detector for FM. A data shaping filter advantageously realized with the internal high performance operational-amplifier reduces system bandwidth to an optimized compromise regarding transmission distance and data recognition. Thus, an optimal bit error rate can be achieved without any further active component.
*
*
The comparator connected to the output of the filter has a level-dependent hysteresis and clamps its reference voltage to the signal minimum and maximum peaks as described later. Without IF-input signal in the normal mode only the IF-amplifier and the AM demodulator which operates as a level strength indicator are activated. If the level of the IF signal increases, the whole circuitry is turned on by the wake-up circuit. This signal is externally available at
*
*
1
2
3
4
5
6
7
8
95 9969
Q4 Q1 Q3 Q2
Hysteresis Op. amp. +- Comp. threshold to pin 16 Comparator
Figure 3. Principle function of the clamping comparator
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U4311B
Internal Pin Circuitry
95 9970
TELEFUNKEN Semiconductors
3
13 VRef
1
16
95 9972
Figure 6. Pin 3 RCwake
Figure 4. Pin 1 OPin+ 4
95 9973
Figure 7. Pin 4 GND2 VRef 13 5
2
95 9971 95 9974
Figure 5. Pin 2 OPout
Figure 8. Pin 5 Compout
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TELEFUNKEN Semiconductors
13 VRef
95 9975
U4311B
13 VRef
95 10126
2 8 Figure 11. Pin 8 AMout
6
95 10127
Figure 9. Pin 6 RC-
9
7
13 VRef
Figure 12. Pin 9 IFin
2
95 10128
10
95 10125
Figure 10. Pin 7 RC+
Figure 13. Pin 10 SWout
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U4311B
11
95 10129
TELEFUNKEN Semiconductors
13 VRef
Figure 14. Pin 11 GND1
14
12
95 10132
Figure 17. Pin 14 FMout
13
95 10133 95 10130
Figure 18. Pin 15 VS
Figure 15. Pin 12 Discr
95 10134
15
VS 16 1
VRef 13
95 10131
Figure 16. Pin 13 VRef
Figure 19. Pin 16 OPin-
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TELEFUNKEN Semiconductors
U4311B
1400 1300 Output Vout ( mV ) 1200
0.005
0.004 l in ( mA )
0.003 1100 0.002 1000 0.001 Input 0 15 20 25 Time ( ms ) 30 35 40 800 900
95 10333
Figure 20. Time domain response of 2 kHz Bessel low pass data filter
100 100 dBmV Output current ( m A ) 80 70 dBmV 60
Data Recovering Filter
The test circuit in figures 23 and 26 includes an example of a data recovering filter realized with the components R1, R2, C1, C2, C3. It is of a second order Bessel type with low pass characteristic, a 3 dB cut-off frequency of 2 kHz and an additional high pass characteristic for suppressing dc and low frequency ac components. Simulation of time domain and frequency response is drawn in figures 20 and 22. This filter gives a typical application of a 1 kBaud Manchester code amplitude modulated transmission. The capacitor C2 is responsible for the high pass cut-off frequency. For a correct pulse response this high pass cutoff frequency should be as low as possible. Figure 20 shows the transient response and the influence of the dc component. The first pulses might be wrong if the high pass cut-off frequency is too low. For this reason some burst bits must be transmitted before the real data transmission starts. On the other hand, if the cut-off frequency is too high, you might get in trouble with roof shaping of the rectangle pulses at the operational amplifier output. The low pass cut-off frequency and the maximum transimpedance Vout/Iin are distinguished by the further external elements. Careful design of the data filter gives optimized transmission range. For designing other filter parameters look for filter design handbooks or programs or request TEMIC TELEFUNKEN microelectronic GmbH for support. Some proposals can be found in the application notes ANT012, ANT013 and ANT015.
40 20 30 dBmV 0 6 8 10
50 dBmV
12
14
16
95 10332
IF frequency ( MHz )
Figure 21. IF-frequency response
0
-10 V / V ( dB ) max
-20
-30
-40 0.01
95 10334
0.1
1 Frequency ( kHz )
10
100
Figure 22. Frequency response of 2 kHz Bessel low pass data filter
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U4311B
C7 VS 10 mF C8 C9
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56 W
R9
100 nF 10 mF
C10 10 nF R8
100 kW
300 W
IF input R10
C11 10 nF 10 9 Wake up out
16 8.2 kW R1
15
14
13
12
11
C3 C2 100 nF C1 10 nF 1.5 nF 100 kW R6 30 kW R2 100 kW 1 2 3 4 5 6 7 8
R5
C4 100 nF
R12
C12 Comparator output
100 kW 220 nF Data filter output R7 22 kW Wake up R3 220 kW R13 10 kW 100 kW C5 220 nF R4 C6 220 nF
R11 10 kW
Figure 23. AM test circuit with 2 kHz Bessel low pass data filter
LP-filter output voltage Vs+n/Vn ( dB )
10 0 -10 -20 -30 -40 -50 -60 -70 -80 0 20 40 60 80 100 N (high level) N (low level) AM output current ( m A ) S+N
100 90 80 70 60 50 40 30 20 10 10
95 10276
+25C +85C
-40C
25
40
55
70
85
100
95 10292
IF-input level ( dmBV )
IF-input level (dBmV )
Figure 24. Signal to noise ratio AM
Figure 25. AM-demodulator characteristic vs. temperature
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95 10135
TELEFUNKEN Semiconductors
VS C7 10 mF C8 100 nF R15 22 k W R14 22 k W 10 mF C9 C10 22 pF R8 100 k W 300 Filter
U4311B
TOKO A119ACS-19000Z (L = 2.2 mH, C = 100 pF)
56
W W
R9
IF input R10 C11 10 nF Wake up out
16 C2 100 nF 8.2 k W R1
15
14
13
12
11
10
9
1.5 nF 1 100 kW C1 10 nF 30 k W 100 k W R6 R5 C4 100 nF 2 3 4 5 6 7 8
R2
R12
C12
10 k W
R11
100 k W 220 nF R7 22 kW Data filter output Wake up R3 220 k W R13 10 k W 100 kW C5 220 nF R4 C6 220 nF Comparator output
Figure 26. FM test circuit with 2 kHz Bessel low pass data filter
LP-filter output voltage Vs+n/Vn ( dB )
10 0 Output voltage ( V ) -10 -20 -30 -40 -50 -60 -70 0 20 40 60 80 100 N S+N
2.5 C10 = 22 pF 2.0 1.5 1.0 0.5 0 10.3
95 10290
C10 = 47 pF
10.5
10.7
10.9
95 10136
C3
11.1
95 10291
IF-input level ( dmBV )
Frequency ( MHz )
Figure 27. Signal to noise ratio FM; deviation 22.5 kHz
Figure 28. FM-discriminator characteristic
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U4311B
VS 350 mA 350 mA
TELEFUNKEN Semiconductors
RF in
Data out
1 mA Signal path Power supply Figure 29. Principle diagram UHF remote control receiver
95 10137
Ordering Information
Extended Type Number U4311B-C U4311B-CFL Package DIP16 SO16L Remarks
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TELEFUNKEN Semiconductors
U4311B
Dimensions in mm
Package: DIP16
94 9128
Package: SO16L
94 8961
Rev. A1: 23.06.1995
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U4311B
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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